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Thread: VW Component Identifiers (What the letter and numbers mean in automotive components)

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    VW Component Identifiers (What the letter and numbers mean in automotive components)

    This thread is a work in progress so I plan to edit this first post over time based on replies, suggestions, etc.

    In some fault code texts and control module identification information or wiring diagrams, you may see a letter-number combination like J104 or G17:

    Address 03: ABS Brakes (J104) Labels: 7P0-907-379.clb
    Part No SW: 7P0 907 379 K HW: 7P0 907 379 A
    Component: MK25A H36 0418

    00779 - Outside Air Temp Sensor (G17)
    012 - Electrical Fault in Circuit - Intermittent

    I thought these were ostensibly DIN component identifiers, come up with by the Deutsches Institut für Normung who document and dictate seemingly every aspect of German life:

    http://en.wikipedia.org/wiki/Deutsch...C3%BCr_Normung

    They have a very non-standard design for the headquarters, oh the irony:

    http://en.wikipedia.org/wiki/Deutsch...itz_Berlin.jpg

    ... but it looks like VW might have kinda made it up on their own because the closest I can find to a spec is EN 61346 which uses A for "ABS control unit, radio, two-way radios, mobile phone, alarm system, equipment assembly, ignition trigger box, electronic control unit, cruise control". That clearly doesn't match up with what VW does.

    So the idea is, that regardless of the year/make/model/engine/etc. of a vehicle and regardless of the location of the component, it should be possible to determine the general type of component (from the letter part) and the specific nature of it (from the number part). For example, J is a control module, a little computer. It can be something that you can talk to with a scan tool (like J104, an ABS controller), or something that doesn't talk directly to a scan tool (like a J293 Coolant FC (Fan Control) Control Module) which has some logic in it but which doesn't talk to the outside world, at least not directly.

    Let's start with Component Code Prefixes which may be a single letter but there seem to be a letter then X combo like "JX" as well:
    A - Battery
    B - Starter
    C - Alternator/generator
    D - Ignition/starter switch
    E - Switches — these are usually more complex switches: A/C control head, sunroof regulator
    F - Switches — door, hood, brake, clutch, trunk, multifunction, etc.
    G - Gauges and sensors
    H - Horn
    J - Control modules, relays, electronic relays
    K - Indicator/warning lights
    L - Lights
    M - Lights
    N - Solenoids/inductors/ignition — fuel injectors, purge, ignition coil, ignition module, etc.
    P - Spark plug connector
    Q - Spark plugs
    R - Radio, CD, telephone, navigation
    S - Fuse, circuit breaker, protection device
    T - Wire connector V Motor — window motors, vacuum pumps, etc.
    W - Lights — interior, trunk
    Z - Heating elements — O2 sensor heater, heated seats, heated mirrors, etc

    After each of these prefix letters, there may be a wide range of numbers (or no numbers for the really cool, OG components):

    Code:
    A -    Battery 
    A1 -    Auxiliary battery 
    A2 -    Drive battery 
    A19 -    Voltage converter 
    A27 -    Right LED headlamp power output module 1 
    A31 -    Left LED headlamp power output module 1
    A37 -    Drive motor inverter
    Code:
    AX2 -    High voltage battery 1 
    AX4 -    High voltage battery charger 1
    Code:
    B -    Starter
    Code:
    C -    Generator (GEN) 
    C1 -    Voltage regulator 
    C24 -    Suppressor
    Code:
    D -    Ignition/starter switch 
    D2 -    Immobilizer reader coil
    Code:
    E1 -    Light Switch 
    E7 -    Fog Lamp Switch 
    E20 -    Instrument Panel Illumination Dimmer Switch 
    E26 -    Glove Compartment Light Switch 
    F34 -    Brake fluid level warning switch 
    E40 -    Left front window regulator switch 
    E43 -    Mirror adjusting switch 
    E45 -    Cruise control switch 
    E48 -    Mirror selector switch 
    E53 -    Left rear window regulator switch in driver door 
    E55 -    Right rear window regulator switch in driver door 
    E81 -    Right front power window switch in driver door 
    E97 -    Driver memory seat control head 
    E107 -    Front passenger door window regulator switch 
    E150 -    Driver interior locking switch 
    E168 -    Folding mirror adjustment switch 
    E190 -    Emergency off button 
    E198 -    Front passenger interior locking switch 
    E217 -    Alarm system deactivation switch 
    E218 -    Memory seat position 1 button 
    E219 -    Memory seat position 2 button 
    E227 -    Cruise control -SET- button 
    E229 -    Emergency Flasher Button 
    E231 -    Exterior rearview mirror heating switch 
    E233 -    Rear lid remote release button 
    E234 -    Release button in rear lid handle 
    E256 -    ASR/ESP Button 
    E263 -    Mirror folding switch 
    E265 -    Rear A/C display control head
    E273 -    Left rear interior locking switch 
    E274 -    Right rear interior locking switch 
    E277 -    Front passenger memory seat control head 
    E283 -    Driver seat memory button 
    E284 -    Garage door opener control head 
    E308 -    Driver interior locking button 
    E313 -    Selector lever 
    E318 -    Child safety lock button 
    E319 -    Fuel filler door release button, in the driver door 
    E338 -    Memory seat positions 1 and 2 button 
    E340 -    Front passenger memory seat button 
    E406 -    Rear lid lock button in luggage compartment 
    E415 -    Entry and start authorization switch 
    E466 -    Passenger side emergency -off- button 
    E510 -    Left child safety lock button 
    E511 -    Right child safety lock button 
    E512 -    Power window control head in driver door 
    E530 -    Lane change assistance button 
    E538 -    Electromechanical parking brake button 
    E540 -    -AUTO HOLD- button 
    E616 -    Interior monitoring and vehicle inclination deactivation button 
    E656 -    Electrical drive button 
    E660 -    Driver side rear multicontour seat switch 
    E661 -    Passenger side rear multicontour seat switch 
    E662 -    Seat reclining function remote control
    E662 -    Seat reclining function remote control 
    E672 -    Right rear seat reclining position button 
    E673 -    Right rear seat upright position button 
    E683 -    Left rear seat adjustment control head 
    E684 -    Left rear seat position memory button 
    E685 -    Left rear seat position recall button 
    E686 -    Left rear seat upright position button 
    E687 -    Left rear seat reclining position button 
    E688 -    Right rear seat adjustment control head 
    E689 -    Right rear seat position memory button 
    E690 -    Right rear seat position recall button 
    E700 -    Left rear power window button in left rear door 
    E701 -    Right rear power window button in left rear door 
    E705 -    Right rear power window button in right rear door 
    E706 -    Left rear power window button in right rear door 
    E710 -    Driver power window button 
    E711 -    Driver side rear power window button 
    E713 -    Passenger side rear power window button 
    E716 -    Front passenger power window button 
    E735 -    Driving profile selection button 
    E806 -    Locking mechanism button in the rear lid
    Code:
    EX5 -    Rearview mirror 
    EX11 -    Exterior rearview mirror adjuster 
    EX23 -    Center console switch module 1
    Code:
    F -    Brake Light Switch
    F1 -    Oil pressure switch 
    F2 -    Driver door contact switch 
    F3 -    Front passenger door contact switch 
    F4 -    Back-Up Light Switch 
    F8 -    Kick down switch 
    F10 -    Left rear door contact switch 
    F11 -    Right rear door contact switch 
    F22 -    Oil pressure switch 
    F34 -    Brake Fluid Level Warning Switch 
    F47 -    Brake pedal switch 
    F60 -    Closed throttle position switch 
    F66 -    Engine Coolant Level (ECL) Warning Switch 
    F124 -    Rear lid lock/alarm/central locking switch 
    F125 -    Multi-Function Transmission Range (TR) Switch 
    F131 -    Left front central locking system actuator 
    F132 -    Left rear central locking system actuator 
    F133 -    Right front central locking system actuator 
    F134 -    Right rear central locking system actuator 
    F138 -    Airbag spiral spring/return spring with slip ring 
    F220 -    Driver central locking lock unit 
    F221 -    Front passenger central locking lock unit 
    F222 -    Left rear central locking lock unit 
    F223 -    Right rear central locking lock unit 
    F241 -    Driver lock cylinder contact switch 
    F243 -    Driver door central locking -SAFE- function actuator 
    F244 -    Front passenger door central locking -SAFE- function actuator 
    F245 -    Left rear door central locking -SAFE- function actuator 
    F246 -    Right rear door central locking -SAFE- function actuator 
    F248 -    Rear lid lock cylinder unlock button 
    F256 -    Rear Lid Lock Unit 
    F265 -    Map controlled engine cooling thermostat 
    F266 -    Front Hood Switch 
    F332 -    Rear lid closing assist/unlock stop switch 
    F333 -    Rear lid closing assist/lock stop switch 
    F334 -    Fuel filler detection switch 
    F344 -    Left rear child safety lock contact switch 
    F345 -    Right rear child safety lock contact switch 
    F378 -    Reduced oil pressure switch
    F390 -    Driver side second row seat belt switch 
    F391 -    Center second row seat belt switch 
    F392 -    Passenger side second row seat belt switch
    Code:
    FX2 -    Brake pedal switch
    Code:
    G -    Fuel level sensor 
    G1 -    Fuel gauge 
    G3 -    Engine coolant temperature gauge 
    G5 -    Tachometer 
    G6 -    Transfer fuel pump 
    G8 -    Oil Temperature Sensor 
    G17 -    Ambient temperature sensor 
    G21 -    Speedometer 
    G23 -    Fuel pump 
    G28 -    Engine speed sensor 
    G31 -    Charge air pressure sensor 
    G32 -    Engine coolant level sensor 
    G39 -    Heated oxygen sensor 
    G40 -    Camshaft position sensor 
    G42 -    Intake air temperature sensor 
    G44 -    Right rear ABS wheel speed sensor 
    G45 -    Right front ABS wheel speed sensor 
    G46 -    Left rear ABS wheel speed sensor 
    G47 -    Left front ABS wheel speed sensor 
    G61 -    Knock sensor 1 
    G62 -    Engine coolant temperature sensor 
    G65 -    High Pressure Sensor
    G66 -    Knock sensor 2 
    G69 -    Throttle position sensor 
    G70 -    Mass airflow sensor 
    G71 -    Manifold absolute pressure sensor 
    G79 -    Accelerator pedal position sensor 
    G81 -    Fuel temperature sensor 
    G83 -    Engine coolant temperature sensor on radiator outlet 
    G98 -    EGR temperature sensor 
    G100 -    Brake pedal position sensor 
    G107 -    Sunlight photo sensor 
    G108 -    Heated oxygen sensor 2 
    G128 -    Front passenger occupant detection sensor 
    G130 -    Oxygen sensor after three way catalytic converter 
    G135 -    Defroster door motor position sensor 
    G150 -    Left vent temperature sensor 
    G151 -    Right vent temperature sensor 
    G169 -    Fuel level sensor 2 
    G179 -    Driver side airbag crash sensor 
    G180 -    Front passenger side airbag crash sensor 
    G185 -    Accelerator pedal position sensor 2 
    G186 -    EPC throttle drive 
    G187 -    EPC throttle drive angle sensor 1
    G188 -    EPC throttle drive angle sensor 2 
    G190 -    Front airbag crash sensor 
    G192 -    Footwell vent temperature sensor 
    G200 -    Transverse acceleration sensor 
    G201 -    Brake pressure sensor 1 
    G202 -    Rotation rate sensor 
    G212 -    EGR potentiometer 
    G220 -    Left temperature door potentiometer/actuator 
    G221 -    Right temperature door potentiometer/actuator 
    G229 -    Driver seat rear height adjustment sensor 
    G235 -    Exhaust gas temperature sensor 1 
    G236 -    Bank 2 Exhaust Gas Temperature (EGT) Sensor 1 
    G237 -    Fuel level sensor 3 
    G238 -    Air quality sensor 
    G242 -    Engine compartment temperature sensor 1
    G246 -    Mass airflow sensor 2 
    G247 -    Fuel pressure sensor 
    G251 -    Longitudinal acceleration sensor 
    G256 -    Driver side rear side airbag crash sensor 
    G257 -    Passenger side rear side airbag crash sensor 
    G266 -    Oil level thermal sensor 
    G273 -    Interior monitoring sensor 
    G294 -    Brake booster pressure sensor 
    G295 -    NOx sensor 
    G308 -    Evaporator temperature sensor 
    G384 -    Vehicle inclination sensor 
    G395 -    A/C pressure/temperature sensor 
    G397 -    Rain/light recognition sensor 
    G407 -    Engine temperature sender 
    G415 -    Driver exterior door handle touch sensor 
    G416 -    Front passenger exterior door handle touch sensor 
    G417 -    Left rear exterior door handle touch sensor 
    G418 -    Right rear exterior door handle touch sensor 
    G447 -    Charge air pressure sensor 2 
    G448 -    Exhaust gas temperature sensor 2 
    G465 -    Oxygen sensor in bank 1 center three way catalytic converter 
    G466 -     EGR potentiometer  2 
    G450 -    Exhaust pressure sensor 1 
    G451 -    Exhaust pressure sensor 2 
    G466 -    Exhaust gas recirculation position sensor 2 
    G476 -    Clutch Position Sensor 
    G495 -    Exhaust gas temperature sensor 3 
    G498 -    Particulate filter intake temperature sensor 2 
    G499 -    Turbocharger intake temperature sensor 2 
    G505 -    Differential pressure sensor 
    G504 -    Fuel additive empty sensor 
    G505 -    Differential Pressure Sensor 
    G506 -    Temperature sender before particulate filter 
    G507 -    Turbocharger intake temperature sensor 
    G514 -    Driver exterior rearview mirror horizontal position sensor 
    G515 -    Driver exterior rearview mirror vertical position sensor 
    G516 -    Front passenger exterior rearview mirror horizontal position sensor 
    G517 -    Front passenger exterior rearview mirror vertical position sensor 
    G524 -    Pressure differential sender 2 
    G525 -    Rear lid -closed- sensor 1 
    G527 -    Temperature sender after particulate filter 
    G526 -    Rear lid -closed- sensor 2 
    G551 -    Driver belt force limiter 
    G552 -    Front passenger belt force limiter 
    G578 -    Anti-theft alarm system sensor 
    G605 -    Left front exterior door handle touch sensor 
    G606 -    Right front exterior door handle touch sensor 
    G608 -    Vacuum sender 
    G609 -    Secondary air injection sensor 1 
    G624 -    Fuel Pressure Sensor 2 
    G642 -    Front air distribution door motor position sensor 
    G644 -    Fresh air/recirculating air/back pressure door motor position sensor 
    G648 -    Exhaust gas temperature sensor 4 
    G653 -    Speed Sensor 1 
    G657 -    Humidity sensor in fresh air intake duct 
    G664 -    Oil temperature sensor 2 
    G678 -    Cylinder 2 combustion chamber pressure sensor 
    G685 -    Reducing agent temperature sensor 
    G686 -    Reducing agent metering system pressure sensor 
    G687 -    NOx sensor 2 
    G691 -    Exhaust Gas Recirculation Pressure Sensor 
    G692 -    Exhaust Gas Recirculation Pressure Sensor 2 
    G694 -    Engine temperature control sensor 
    G697 -    Reducing agent reservoir sensor 
    G712 -    Drive motor temperature sensor 
    G713 -    Drive motor rotor position sensor 1 
    G750 -    Power rear lid opener sensor, in the rear bumper 
    G760 -    Rear lid opener sensor 2, in the rear bumper 
    G784 -    Particulate sensor 
    G788 -    Temperature sensor after electro-drive drive motor 
    G805 -    Refrigerant circuit pressure sensor 
    G810 -    Charge air temperature sender before charge air cooler 
    G811 -    Charge air temperature sender after charge air cooler 
    G836 -    Brake pedal position sensor 2
    Code:
    GX1 -    Fuel delivery unit 
    GX2 -    Accelerator pedal module 
    GX3 -    Throttle valve module 
    GX5 -    Exhaust gas recirculation valve 1 
    GX6 -    Exhaust gas recirculation valve 2 
    GX7 -    Oxygen sensor 1 after catalytic converter 
    GX9 -    Intake manifold sensor 
    GX10 -    Oxygen sensor 1 before catalytic converter 
    GX11 -    Oxygen sensor 2 before catalytic converter 
    GX26 -    Charge air pressure sensor
    Code:
    H3 -    Warning buzzer and tone 
    H12 -    Alarm Horn
    Code:
    J4 -    Dual Horn Relay 
    J9 -    Rear Window Defogger Relay 
    J17 -    Fuel pump relay 
    J32 -    A/C relay 
    J53 -    Starter relay 
    J104 -    ABS Control Module 
    J126 -    Fresh air blower control module 
    J136 -    Seat and steering column adjustment control unit with memory 
    J151 -    Coolant Circulation Pump Relay 
    J179 -    Automatic glow time control module 
    J197 -    Level control system control module 
    J217 -    Transmission control module 
    J234 -    Airbag control module 
    J245 -    Power sunroof control module 
    J250 -    Electronic damping control module 
    J255 -    Climatronic control module 
    J271 -    Motronic engine control module power supply relay
    J285 -    Instrument Cluster Control Module 
    J293 -    Coolant fan control module 
    J299 -    Secondary air injection pump relay 
    J317 -    Terminal 30 power supply relay 
    J318 -    Vacuum pump relay 
    J329 -    Terminal 15 power supply relay 
    J338 -    Throttle valve control module 
    J345 -    Towing recognition control module 
    J364 -    Auxiliary heater control module 
    J367 -    Battery monitoring control module 
    J386 -    Driver door control module 
    J387 -    Front passenger door control module 
    J388 -    Left Rear Door Control Module 
    J389 -    Right Rear Door Control Module 
    J391 -    Rear fresh air blower control module 
    J393 -    Comfort system central control module 
    J400 -    Wiper Motor Control Module 
    J404 -    Terminal 15 load reduction relay 
    J428 -    Distance regulation control module 
    J431 -    Headlamp range control module 
    J445 -    Fuel cooling pump relay 
    J446 -    Parking aid control module 
    J492 -    All wheel drive control module
    J496 -    Auxiliary engine coolant pump relay 
    J500 -    Power steering control module 
    J502 -    Tire pressure monitoring control module 
    J505 -    Windshield defogger control module 
    J508 -    Brake Light Disable Relay 
    J518 -    Access/start authorization control module 
    J519 -    Vehicle electrical system control module 
    J521 -    Front passenger memory seat control module
    J525 -    Digital sound system control module 
    J527 -    Steering Column Electronic Systems Control Module 
    J532 -    Voltage stabilizer 
    J533 -    Data bus on board diagnostic interface 
    J538 -    Fuel Pump (FP) Control Module 
    J539 -    Brake booster control module 
    J540 -    Control unit for electromechanical parking brake 
    J581 -    Parallel battery connection relay 
    J583 -    NOx sensor control module 
    J605 -    Rear lid control module 
    J608 -    Special vehicle control unit 
    J623 -    Engine control module 
    J624 -    Engine control module 2 
    J643 -    Fuel Primer Relay 
    J647 -    Axle differential lock control module 
    J667 -    Output module for left headlight 
    J668 -    Output module for right headlight 
    J671 -    Coolant fan control module 2 
    J680 -    Power Supply Relay 1 (terminal 75) 
    J681 -    Power Supply Relay 2 (terminal 15) 
    J682 -    Power Supply Relay (terminal 50) 
    J685 -    Front information display control head 
    J689 -    Terminal 30 power supply relay 2 
    J695 -    Relay 2 for starter 
    J701 -    Power supply relay 1 
    J703 -    Glow time control module 2 
    J710 -    Power supply relay 2 
    J715 -    Fuel pump pre-run relay 
    J724 -    Turbocharger control module 1 
    J725 -    Turbocharger control module 2 
    J743 -    Direct Shift Gearbox (DSG) Mechatronic 
    J745 -    Cornering lamp and headlamp range control module 
    J749 -    Auxiliary Heater Fuel Pump Relay 
    J764 -    Electronic steering column lock control module 
    J769 -    Lane change assist control unit 
    J772 -    Rearview camera system control module
    J773 -    Convenience system central control unit 2 
    J774 -    Heated Rear Seats Control Module
    J791 -    Parallel parking assistance control module 
    J792 -    Active steering control module 
    J794 -    Information electronics control module 1 
    J819 -    Center operating unit for dash panel 
    J829 -    Information electronics control module 2 
    J840 -    Battery regulation control module 
    J842 -    A/C compressor control module 
    J844 -    Automatic high beam assist control module 
    J842 -    A/C compressor control module 
    J848 -    High voltage heater (PTC) control module 
    J849 -    Sensor electronics control module 
    J850 -    Distance regulation control module 2 
    J851 -    Image processing control module 
    J852 -    Camera control module 
    J853 -    Night vision system control module 
    J854 -    Left front seat belt tensioner control module 
    J855 -    Right front seat belt tensioner control module 
    J856 -    Navigation system control module 
    J869 -    Structure borne sound control module 
    J872 -    Front passenger multicontour seat control module
    J873 -    Driver multicontour seat control module 
    J874 -    Passenger side rear multicontour seat control module 
    J875 -    Driver side rear multicontour seat control module 
    J876 -    Driver side rear seat adjustment control module
    J877 -    Passenger side rear seat adjustment control module
    J880 -    Reducing agent metering system control module
    J881 -    NOx sensor control module 2 
    J898 -    Windshield projection head up display control module 
    J928 -    Peripheral camera control module 
    J931 -    Subframe mount control module 
    J963 -    Reducing agent metering system relay
    J965 -    Access/start system interface 
    J984 -    Mobile communication 2-way signal amplifier 
    J1032 -    Cooling fan control unit 
    J1050 -    High voltage battery charger control module
    Code:
    JX1 -    Electric drive power and control electronics  (this guy's numbering doesn't play well with others)
    Code:
    K2 -    Generator indicator lamp
    K3 -    Oil pressure indicator lamp 
    K6 -    Emergency Flasher Indicator Lamp
    K19 -    Seat belt indicator lamp 
    K28 -    Engine coolant level/temperature indicator lamp 
    K31 -    Cruise control indicator lamp 
    K47 -    ABS indicator lamp 
    K83 -    Malfunction indicator lamp 
    K118 -    Brake system indicator lamp 
    K105 -    Low fuel level indicator lamp 
    K132 -    Electronic power control malfunction indicator lamp
    K133 -    Central locking -SAFE- indicator lamp 
    K139 -    Parking brake indicator lamp 
    K145 -    Front passenger airbag -disabled- indicator lamp 
    K155 -    ASR/ESP indicator lamp 
    K213 -    Electromechanical parking brake indicator lamp 
    K220 -    Tire pressure monitoring display indicator lamp 
    K236 -    Child safety lock -activated- indicator lamp 
    K237 -    -AUTO HOLD- indicator lamp 
    K268 -    Left front footwell lamp 
    K269 -    Right front footwell lamp 
    K280 -    Driving profile selection indicator lamp
    Code:
    KX2 -    Instrument cluster
    Code:
    L9 -    Headlamp Switch Illumination 
    L22 -    Left Front Fog Lamp 
    L23 -    Right Front Fog Lamp 
    L76 -    Push button illumination bulb 
    L78 -    Mirror adjustment switch illumination bulb 
    L131 -    Driver exterior rearview mirror turn signal bulb 
    L132 -    Front passenger exterior rearview mirror turn signal bulb 
    L176 -    Left LED Parking Lamp/DRL Module 
    L177 -    Right LED Parking Lamp/DRL Module
    L219 -    Driver side interior door handle illumination lamp 
    L220 -    Passenger side interior door handle illumination lamp
    Code:
    M1 -    Left Parking Lamp 
    M3 -    Right Parking Lamp 
    M5 -    Left Front Turn Signal Lamp 
    M6 -    Left Rear Turn Signal Lamp 
    M7 -    Right Front Turn Signal Lamp 
    M8 -    Right Rear Turn Signal Lamp 
    M9 -    Left Brake Lamp 
    M10 -    Right Brake Lamp 
    M16 -    Left Back-Up Lamp 
    M17 -    Right Back-Up Lamp 
    M25 -    High-mount Brake Light 
    M29 -    Left Low Beam Headlamp 
    M30 -    Left High Beam Headlamp 
    M31 -    Right Low Beam Headlamp 
    M32 -    Right High Beam Headlamp 
    M33 -    Left Front Side Marker Lamp 
    M34 -    Right Front Side Marker Lamp
    Code:
    N18 -    EGR vacuum regulator solenoid valve 
    N30 -    Cylinder 1 fuel injector 
    N31 -    Cylinder 2 fuel injector 
    N32 -    Cylinder 3 fuel injector 
    N33 -    Cylinder 4 fuel injector
    N70 -    Ignition coil 1 with power output stage 
    N79 -    Positive Crankcase Ventilation (PCV) Heating Element 
    N80 -    EVAP canister purge regulator valve 1 
    N83 -    Cylinder 5 fuel injector 
    N84 -    Cylinder 6 Fuel Injector 
    N85 -    Cylinder 7 fuel injector 
    N86 -    Cylinder 8 fuel injector 
    N99 -    Right front ABS inlet valve 
    N100 -    Right front ABS outlet valve 
    N101 -    Left front ABS inlet valve 
    N102 -    Left front ABS outlet valve 
    N110 -    Shift lock solenoid 
    N112 -    Secondary air injection solenoid valve 
    N127 -    Ignition coil 2 with power output stage 
    N131 -    Front passenger airbag igniter 1 
    N133 -    Right rear ABS inlet valve 
    N134 -    Left rear ABS inlet valve 
    N135 -    Right rear ABS outlet valve 
    N136 -    Left rear ABS outlet valve 
    N144 -    Left electrohydraulic engine mount solenoid valve 
    N145 -    Right electrohydraulic engine mount solenoid valve 
    N153 -    Driver seat belt tensioner igniter 1 
    N154 -    Front passenger seat belt tensioner igniter 1 
    N180 -    Changeover valve 
    N196 -    Driver side rear seat belt tensioner igniter 
    N197 -    Passenger side rear seat belt tensioner igniter 
    N199 -    Driver thorax airbag igniter 
    N200 -    Front passenger thorax airbag igniter 
    N201 -    Driver side rear thorax airbag igniter 
    N202 -    Passenger side rear thorax airbag igniter 
    N205 -    Camshaft adjustment valve 1 
    N213 -    Valve 2 for EGR 
    N225 -    Driving dynamics regulation switch valve 1 
    N226 -    Driving dynamics regulation switch valve 2 
    N227 -    Driving dynamics regulation high pressure switch valve 1 
    N228 -    Driving dynamics regulation high pressure switch valve 2 
    N240 -    Cylinder 1 pump/injector valve 
    N241 -    Cylinder 2 pump/injector valve 
    N242 -    Cylinder 3 pump/injector valve 
    N243 -    Cylinder 4 pump/injector valve 
    N244 -    Cylinder 5 pump/injector valve 
    N245 -    Cylinder 6 pump/injector valve 
    N251 -    Driver head curtain airbag igniter 
    N252 -    Front passenger head curtain airbag igniter 
    N253 -    Battery interrupt igniter
    N276 -    Fuel pressure regulating valve 
    N280 -    A/C compressor regulator valve 
    N290 -    Fuel metering valve 
    N291 -    Ignition coil 3 with power output stage 
    N292 -    Ignition coil 4 with power output stage 
    N295 -    Driver knee airbag igniter 
    N299 -    Cylinder 9 fuel injector 
    N300 -    Cylinder 10 fuel injector 
    N301 -    Cylinder 11 fuel injector 
    N302 -    Cylinder 12 fuel injector 
    N303 -    Cylinder 7 pump/injector valve 
    N304 -    Cylinder 8 pump/injector valve 
    N305 -    Cylinder 9 pump/injector valve 
    N306 -    Cylinder 10 pump/injector valve 
    N323 -    Ignition coil 5 with power output stage 
    N345 -    EGR cooler switch-over valve 
    N381 -    EGR cooler switch-over valve 2 
    N402 -    Fuel Metering Valve 2 
    N428 -    Oil pressure regulation valve 
    N449 -    Clutch valve 1 
    N474 -    Reducing agent injector 
    N483 -    Positive Crankcase Ventilation (PCV) Heating Element 2 
    N484 -    Fuel Pressure Regulator Valve 2 
    N489 -    Cylinder head coolant valve 
    N509 -    Transmission fluid cooling valve
    N649 -    Switch valve for mechanical coolant pump 
    N687 -    Radiator bypass switch-over valve
    Code:
    NX6 -    Brake booster
    Code:
    P -    Spark plug connectors
    Code:
    Q -    Spark plugs 
    Q10 -    Glow plug 1 
    Q11 -    Glow plug 2 
    Q12 -    Glow plug 3 
    Q13 -    Glow plug 4 
    Q14 -    Glow plug 5 
    Q15 -    Glow plug 6
    Q16 -    Glow plug 7 
    Q17 -    Glow plug 8 
    Q18 -    Glow plug 9 
    Q19 -    Glow plug 10 
    Q20 -    Glow Plug 11 
    Q21 -    Glow Plug 12 
    Q35 -    Glow plug 1 with pressure sensor 
    Q36 -    Glow plug 2 with pressure sensor
    Code:
    R -    Radio 
    R78 -    TV tuner
    R134 -    Driver access/start system antenna 
    R135 -    Front passenger access/start system antenna 
    R136 -    Access/start system antenna in rear bumper 
    R137 -    Access/start system antenna in luggage compartment 
    R138 -    Access/start system antenna 1 in vehicle interior 
    R149 -    Auxiliary engine coolant heater radio frequency receiver 
    R152 -    Bluetooth antenna 
    R161 -    DVD changer 
    R171 -    Digital TV tuner 
    R205 -    GSM antenna 
    R214 -    Structure-Borne Sound Actuator 
    R242 -    Driver assistance systems front camera 
    R265 -    Storage compartment with cell phone interface
    Code:
    T -    This spot left blank because T just means terminal and the same thing (like T14) just means a 14 pin connector, it doesn't tell you what it goes to.
    Code:
    S -    This spot left blank because S just means Fuse and SA1 means a different thing in different cars. Fuse locations are a subject for a different how-to.
    Code:
    U1 -    Cigarette Lighter
    U5 -    12 V socket 
    U6 -    Battery jump start terminal 
    U11 -    Interior socket, 230 V, 110 V 
    U31 -    Diagnostic connection
    Code:
    UX4 -    High voltage battery charging socket 1
    Code:
    V1 - Sunroof Motor
    V2 -    Fresh air blower 
    V5 -    Windshield Washer Pump 
    V7 -    Coolant fan 
    V14 -    Left window regulator motor 
    V15 -    Right window regulator motor 
    V17 -    Driver mirror adjustment motor 2 
    V22 -    Vacuum pump 
    V25 -    Front passenger side mirror adjustment motor 2 
    V26 -    Left rear window regulator motor 
    V26 - Motor for Window Regulator, rear left
    V27 -    Right rear window regulator motor 
    V36 -    Water pump 
    V50 - Coolant Pump
    V50 - Coolant Pump (without aux heat only)
    V51 - After-Run Coolant Pump
    V53 -    Rear lid central locking system motor 
    V55 -    Circulation pump 
    V56 -    Driver door central locking system motor 
    V57 -    Front passenger door central locking system motor 
    V64 -    ABS hydraulic pump 
    V87 - Left Rear Seat Fore/Aft Adjusting Motor
    V88 - Right Rear Seat Fore/Aft Adjusting Motor
    V101 -    Secondary air injection pump motor 
    V107 -    Defroster door motor 
    V107 - Defroster Flap Motor
    V108 - Left Footwell Flap Motor
    V109 - Right Footwell Flap Motor
    V121 -    Driver exterior rearview mirror folding motor 
    V122 -    Front passenger exterior rearview mirror folding motor 
    V123 - Motor for Steering Column Adjustment, Vertical
    V124 - Motor for Steering Column Adjustment, Axial
    V135 -    Additive particle filter pump 
    V139 -    Rear Lid Release Motor 
    V139 - Motor to Unlock rear Lid
    V141 -    Electro-drive drive motor 
    V144 -    Leak detection pump 
    V144 - Leak Detection Pump (LDP)
    V149 -    Driver mirror adjustment motor 
    V150 -    Front passenger mirror adjustment motor 
    V155 -    Fuel Tank Lid Unlock Motor 
    V157 -    Intake flap motor 
    V158 -    Left temperature door motor 
    V159 -    Right temperature door motor 
    V161 -    Driver door central locking -SAFE- motor 
    V162 -    Front passenger central locking -SAFE- motor 
    V166 -    Fuel cooler pump 
    V177 -    Coolant fan 2 
    V189 - Secondary Air Injection (AIR) Pump Motor 2
    V195 - Right Rear Footwell/Defrost Flap Motor
    V196 - Left Rear Footwell/Defrost Flap Motor
    V197 - Front Cold Air Flap Motor
    V198 - Front Warm Air Flap Motor
    V199 - Right Front Defrost/Upper Body Shut-Off Flap Motor
    V200 - Left Front Defrost/Upper Body Flap Shut-Off Motor
    V201 - Right Rear Center Console Warm Air Flap Motor
    V202 - Left Rear Center Console Warm Air Flap Motor
    V203 - Right Rear Center Console Cold Air Flap Motor
    V204 - Left Rear Center Console Cold Air Flap Motor
    V212 - Left B-Pillar/Footwell Shut-Off Flap Motor
    V214 -    Left rear central locking -lock- motor 
    V215 -    Right rear central locking -lock- motor 
    V216 - Left Windshield Wiper Motor
    V217 - Right Windshield Wiper Motor
    V227 - Left Rear Seat Tilt Adjustment Motor
    V228 - Right Rear Seat Tilt Adjustment Motor
    V241 - Rear Lid Hydraulic Motor
    V254 - Rear Lid Opening Motor
    V260 - Sunroof Blind Motor
    V275 -    Intake flap motor 2 
    V278 - Door Closing Assist Motor
    V280 -    Turbocharger 1 control motor 
    V281 -    Turbocharger 2 servo motor 
    V282 -    Left parking brake motor 
    V283 -    Right parking brake motor 
    V338 -    EGR motor 
    V339 -   EGR motor 2 
    V400 -    Exhaust Gas Recirculation (EGR) Cooler Pump 
    V403 -    Circulation pump 2 
    V404 -    Circulation pump 3 
    V409 -    Left side window defroster door motor 
    V425 -    Fresh air/recirculating air/back pressure door motor 
    V426 -    Front air distribution door motor 
    V437 -    Reducing agent pump 
    V470 -    Electrical A/C compressor
    V509 -    Coolant pump in front of high voltage heater (PTC) 
    V544 -    Radiator shutter motor 
    V545 -    Motor in recuperation brake pressure reservoir
    Code:
    VX4 -    Driver exterior rearview mirror 
    VX5 -    Front passenger exterior rearview mirror 
    VX21 -    Driver door lock unit 
    VX22 -    Front passenger door lock unit 
    VX23 -    Left rear door lock unit 
    VX24 -    Right rear door lock unit 
    VX25 -    Rear lid lock unit 
    VX54 -    Three-phrase current drive 
    VX57 -    Coolant fan 
    VX70 -    Brake system pressure reservoir
    Code:
    W1 -    Front Interior Light 
    W3 -    Luggage Compartment Light
    W30 -    Driver door warning lamp 
    W31 -    Left front entry lamp 
    W32 -    Right front entry lamp 
    W33 -    Left rear entry lamp 
    W34 -    Right rear entry lamp 
    W36 -    Front passenger door warning lamp 
    W37 -    Left rear door warning lamp 
    W38 -    Right rear door warning lamp 
    W52 -    Driver entry lamp in exterior rearview mirror 
    W53 -    Front passenger entry lamp in exterior rearview mirror 
    W67 -    Fiber optic cable for left front sill panel ambient lighting 
    W68 -    Fiber optic cable for right front sill panel ambient lighting 
    W69 -    Fiber optic cable for left rear sill panel ambient lighting 
    W70 -    Fiber optic cable for right rear sill panel ambient lighting 
    W74 -    Fiber optic cable for front center console ambient lighting 
    W75 -    Fiber optic cable for rear center console ambient lighting
    W86 -    Driver side door ambient lighting lamp 
    W87 -    Passenger side door ambient lighting lamp 
    W97 -    Driver side door ambient illumination lamp 2 
    W98 -    Front passenger side door ambient illumination lamp 2
    Code:
    WX1 -    Front interior lamp
    Code:
    X -    License Plate Light
    Code:
    Y7 -    Automatic anti-dazzle interior mirror 
    Y24 -    Display unit in instrument cluster 
    Y26 -    Selector lever transmission range position display unit
    Code:
    Z4 -    Heated driver exterior rearview mirror 
    Z5 -    Heated front passenger exterior rearview mirror 
    Z19 -    Oxygen sensor heater 
    Z20 -    Left Washer Nozzle Heater 
    Z21 -    Right Washer Nozzle Heater
    Z28 -    Oxygen sensor 2 heater 
    Z29 -    Oxygen sensor heater 1 after catalytic converter 
    Z102 -    Reducing agent tank heater (heating circuit 1) 
    Z104 -    Reducing agent line heater (heating circuit 2)
    Z113 -    Window defogger for front sensor system 
    Z115 -    High voltage heater (PTC)
    Last edited by Andy; 05-22-2015 at 03:58 PM.

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