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

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Andy

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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/Deutsches_Institut_für_Normung

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

http://en.wikipedia.org/wiki/Deutsches_Institut_für_Normung#/media/File:DIN-Sitz_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)
 
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