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Thread: Mk 4 Jetta Communication down!!

  1. #11
    Verified VCDS User PetrolDave's Avatar
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    Quote Originally Posted by Uwe View Post
    Well it can, if the supposed ground is no good.
    But a "ground that's no good" isn't actually a ground - that's my point.

    The person thinks they are grounding the wire, but actually they're not.

    Many times I've thought I've grounded a probe on my DVM but because of paint and/or corrosion it hasn't actually grounded, so now I always measure a known wire to check the ground is good and only then measure the wire I'm testing.

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  3. #12
    NostraJackAss Jack@European_Parts's Avatar
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  5. #13
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    alright, take 3. positive lead of the meter on pin 7, negative lead on pin4, or on body reads 10.79v. I have been repairing VW/Audi vehicles for a while now and never have I encountered a communication issue this in depth. this is something you don't even get experience with while working at a dealership. I'm at a complete loss and finding any information on diagnosing this system is eluding me. throwing myself at mercy of y'all for any usable info.

  6. #14
    NostraJackAss Jack@European_Parts's Avatar
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    alright, take 3. positive lead of the meter on pin 7, negative lead on pin4, or on body reads 10.79v. I have been repairing VW/Audi vehicles for a while now and never have I encountered a communication issue this in depth. this is something you don't even get experience with while working at a dealership. I'm at a complete loss and finding any information on diagnosing this system is eluding me. throwing myself at mercy of y'all for any usable info



    Put a tone generator on the K line and follow it to the issue at every ECU connector or harness bridge, further while observing WD.

    VIN number of car please?

    Anything 08/2000> will indeed have a gateway combined in cluster.

    Let's start with unplugging that & since you dismissed me on it before.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  7. #15
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by C.F.Danaher View Post
    alright, take 3. positive lead of the meter on pin 7, negative lead on pin4, or on body reads 10.79v.
    OK. Now find a resistor. Anything in the range of a few hundred ohms to a few kilo-ohms and put it between pins 4 and 7 in addition to the meter. What happens to the voltage at pin 7? Beware, if something is pulling the K-line to plus in a "hard" way, that resistor can get hot fast. In place of a resistor, you could also use a low-amperage fuse. 1A or less would be ideal. It should not blow. And the voltage on the K-line should approach ground.

    -Uwe-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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  9. #16
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    it is actually an 08/2000 vehicle. and I have in plugged the cluster. and I apologize for dismissing you, it was an error and not intentional. 3VWSC29M31M041106

  10. #17
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    it is actually an 08/2000 vehicle. and I have in plugged the cluster. and I apologize for dismissing you, it was an error and not intentional. 3VWSC29M31M041106
    NP .......

    You must unplug the cluster and then check to see if things change please at port.

    Code:
    Vehicle Identification No. 3VWSC29M31M041106
    Model Jetta GLS JEM
    Date of production 11.08.2000
    Year 2001
    Sales type 9M25N4
    Engine Code AWD
    Transmission Code FBW
    Axle drive 5S
    Equipment WS
    Roof color T3
    Carpet color code
    Exterior color / Paint Code T3 / C6M
    x
    Special editions E0A Without special action equipment
    Lockable wheel bolts 1PC Wheel bolts with anti-theft protection (unlockable)
    Vehicle class differentiation units/platform components 0CM Vehicle class differentiation -1JM-
    Emission standard 0GL Emission standard TLEV
    Trailer hitch 1D0 without trailer towing
    airbag 4UB Airbag for NAR
    Automatic transmission indicator light 9FA Without automatic transmission indicator light
    Aktivkohlebehälter / Ottopartikelfilter 1E4 Activated carbon canister (ORVR) and siphoning device for fueling
    Aerials 8L3 roof antenna
    Exterior mirror setting 6XN Exterior mirrors, power-adjustable/ separately heated
    Left exterior mirror 5SH Left exterior mirror, flat (US)
    Right exterior mirror 5RR Right exterior mirror, convex (US)
    Drive type 1X0 Front-wheel drive
    Equipment levels A8W Luxury equipment
    Brake type in rear 1KX Disc brakes in rear (Geomet D)
    batteries J1L Battery 280 A (60 Ah)
    Brake type, front 1ZD Disc brakes in front (Geomet D)
    Components with special surface 6FF Exterior mirror housing and various attachments colour coded to vehicle
    Controls (steering wheel/steering column) 4LA Without control element
    Beverage holders 4M6 Beverage holders
    Special color trim 0UA Without special color trim
    Component part sets with country-specific design requirements B0D Assembly kit, USA corresponding vehicle version (not California), various parts
    floor covering 3MH Dilours floor covering without scuff guard
    vehicle tools and jack 1S7 Tool kit and aluminum jack
    brake pressure regulator 1H0 without brake pressure regulator
    Brake systems 1AJ Anti-slip regulation (ABS/ASR/EDL) with electronic differential lock (EDL)
    brake wear indicator 9U1 brake wear indicator
    Heated washer nozzles 9T1 Heated washer nozzles in front
    CD changer/CD player 7A1 CD changer preparation
    Chrome package QJ0 Without aluminum/chrome work package
    Cd enhancing underbody panel 2D1 Complete cd enhancing underbody panel
    Roof rails/roof load rack 3S0 Without roof rails/roof load rack
    Roof insert/convertible top 3FE Tilting and sliding glass sunroof with sunbshade
    Suspension system in rear 1JY Rear shock absorption, basic version 2 (NAR, South America, Mexico)
    Suspension system in front 1GJ Front shock absorption, Basic 2 (Audi)
    Insert for the filling up of unleaded fuel/fuel type 2G7 Filler neck module 1 with insert
    Installation differentiation for components 0EJ Installation differentiation for transmission MQ 250 -- vehicle components --
    Theft protection system 7AG Electronic immobilizer with anti-theft alarm system (for USA)
    Inserts 5MA Decorative inserts
    Interference suppression 8E2 Local interference suppression for FM/AM radio reception
    Manufacturing sequence differentiation 0FL Mexico manufacturing sequence
    Vehicle type AZ0 Vehicle with production equipment
    chassis/running gear 2E0 Base chassis
    window regulator 4R4 Power windows with comfort operation and circuit breaker
    fire extinguisher 6A0 without fire extinguisher
    Headlight activation 8K4 Separate daytime running lights NAR
    Fresh air intake for passenger compartment (with particulate filter) 2V5 Fresh air intake with activated charcoal filter
    Antifreeze 1C2 Antifreeze up to -35 degree celsius tolerance up to -40 degree C
    Vehicle specifications F0A No special purpose vehicle, standard equipment
    throttle control 0L2 accelerator pedal with electronic modul
    Alternators 8GD Alternator 90 A
    Transmission types/gearshift mechanisms 0G4 Cable gearshift
    Transmission shafts 1WB Transmission shafts 100 mm in diameter
    Weight category front axle U33 Suspension range 132
    Base engine T8C 4-cyl. petrol engine 1.8 l assembly 06A.C
    Luggage netting/pocket on backrest(s) 4U5 Luggage pockets on backrest
    Luggage compartment cover 3U0 Without luggage compartment cover
    Tie down straps/net/pocket 6M3 Luggage net
    cruise control system 8T2 Electronic cruise control system (CCS)
    Exterior noise suppression measures 2B1 additional noise dampener
    Luggage compartment trim 5A7 Comfort luggage compartment lining with service flap
    Transmission specifications G0C 5-speed manual transmission
    Brackets 3P0 Without bracket for first aid kit and warning triangle
    handle for hand brake lever 6PA Hand brake lever handle in plastic
    Rear window wiper and washer system 8M0 Without rear window wiper and washer system
    Grab handles at roof frame 5N6 Folding grab handles on roof frame soft fold-away
    Rear axle 0N1 Standard rear axle
    Molded headliner 6NG Unsplit molded headliner roof cutout rear (radio antenna)
    Rear seats 3NF Rear seat bench/backrest, split folding locking
    Heating and air-conditioning system 9AB Manually controlled air conditioning system
    Headlamps 8BL Halogen headlamps for driving on the right, US design
    Instrument clusters U0F Instrument cluster with tachometer, clock and mph speedometer
    Breakaway interior rearview mirror 4L2 Breakaway interior rearview mirror, dimming
    Sticker (customized or special edition) 0KA Without decals and emblems
    Body style K8B Notchback
    Luggage compartment floor covering 6SC Luggage compartment floor covering in needle-punched nonwoven
    Cassette and CD storage unit 4W0 without cassette / CD tray
    Electronic map cooling system QS0 Without electronic map cooling system
    headrest for seat, rear 3Q6 Three rear head restraints
    Head restraints 5ZH Head restraints for front seats, tilt- and height-adjustable with integrated adjustment mechanism
    Fuel tank treatment 2LC Fuel tank with special material treatment (coextrusion)
    Fuel quantity for initial filling 1Z0 Initial standard fuel filling
    Fuel systems 0F2 Fuel system for SI engine
    Body measures 5C1 Body measures for increased safety requirements
    Catalytic converter control 8KA without catalyst control
    Radiator grille 6KC Radiator grille
    Rear license plate bracket 6P2 License plate bracket, rear (NAR)
    Front license plate bracket 6W3 License plate bracket front (small, NAR)
    Paint preservative/transit coating 5K5 Transportation protective film (instead of paint preservation)
    Paint coating FB0 standard paint coating
    Rear cargo area 3GA Without luggage compartment floor
    Steering system arrangement L0L Left-hand drive
    Reading lamp 8S2 One reading light in front, two reading lights in rear
    steering 1N9 steering gear
    Backrest release 3H0 Without backrest release for front seats
    Lumbar support 7P0 Without lumbar support in seat backrests
    steering wheels 1MP Steering wheel for airbag system
    Speaker installation 9VG "Monsoon sound system" (NAR)
    Steering column systems 2C5 Steering column, adjusted axially and vertically
    Headlight range control 8Q0 without beam length regulator
    Center armrest 6E3 Front center armrest
    Multi-function display/trip computer 9Q0 Without multi-function display/ trip computer
    Engine cooling 8Z6 Engine cooling, version 2
    Engine specifications M98 4-cyl. gasoline engine 1.8 L/110 kW 20V turbo base engine is T8B/T8C
    engine compartment lighting 9L0 without engine compartment lighting
    Left vanity mirror 4SQ Left vanity mirror illuminated with cover and special mirror imprint (NAR)
    Right vanity mirror 4TQ Vanity mirror, right, illuminated, with cover and special mirror imprint (NAR)
    Navigation device 7Q0 without navigation system
    rear fog lamp 8TA witout rear fog lamp
    Front fog lamp/additional headlamp 8WA Without fog lights
    Rear of platform module base 4P1 Rear floor panel module, type 2
    Platform group class 7PA Platform group class 1
    Hubcaps 1NL Trims for alloy wheels
    Wheels C6V Alloy wheels 6J x 15 Design: Avus, ET 38
    Radios 8YT Radio "Premium"
    Smoker's/non-smoker's package 9JA Non smoker version
    tire H5B All-weather tires 195/65 R15 H (NAR)
    Tire suppliers V0A Tires without specification of tire brand
    Spare wheel/breakdown kit 1G2 Spare wheel with full tyre, steel
    PCA COLD WEATHER PACKAGE (USA/CAN)
    PEA LUXURY PACKAGE (15" ALLOY WHEELS)
    RSM sound system "Monsoon" package
    Side airbag 4X1 Side airbag in front
    Gearshift knob/handle 6Q4 Comfort gearshift knob/handle
    Special labels/plates 0SC Labels in English
    Tail lamp assemblies 8SB Taillight assembly w/ dark colored lens
    Locking mechanism for boot lid/cover rear 4E2 Tailgate/trunk lid release from inside (electrically)
    Materials of low flammability 4Q1 Materials of low flammability
    Nameplates for sales name QD3 Jetta, lettering for sales name
    Seat belt check 9P1 Seat belt reminder, electric contact in buckle
    Outer rear seat belts 3ZM 3-point seat belts, outer rear
    Center rear seat belts 3C7 3-point seat belt for center rear seat
    Gearshift boot/cover 6R1 Gearshift boot in leatherette
    seat covers N0U Cut pile seat covering
    Seat adjustment 3L3 Manual height adjustment for front seats
    seat heater 4A3 seat heating for front seats separat controlable
    Side lights 7R4 Side marker lamps and turn signal repeaters (turn signals with white lens)
    Key for locking system 8QE Key for locking system with remote control
    Start-stop system/regenerative braking 7L0 Without inertia benefit system/ deceleration fuel cut-off/idle stop valve
    Horns 8Y1 Two-tone horn
    Side and rear windows 4KC Side and rear windows in heat-insulating glass
    Protective side molding 4B2 Body-colored protective side molding
    Sunroof roller blind for rear/side windows 3Y0 without roller blind
    power outlet 7B2 12 volt socket in luggage compartment
    Bumper 2JC Comfort bumpers
    Rear stabilizer 0BC Rear stabilizer
    Front stabilizer 0AE Front stabilizer
    Heavy-duty/sports version 2UA Without bad road/sports version
    Headlamp washer system 8X0 Without headlamp washer system
    Windshield wiper intermittent control/ light/rain sensor 8N4 Windshield wiper intermittent control with potentiometer (four speeds)
    Nameplate set 1RT Nameplate set "1.8T"
    Door storage compartments in front 3YR Door pockets with insert mats
    Fuel filler cap/door, locking option 2W2 Fuel filler cap, attached (NAR)
    Mass damper for steering wheels 1Q0 steering wheel without balance weight
    Door and lid locking system 4K0 Central locking w/ radio remote control and interior controls
    Type approval countries/countries with special requirements B34 Legal requirements USA
    Carrier frequency for remote control 5D2 Carrier frequency 315 MHz
    Partition 3CA without partition
    Door and side trim panels 4AR Door and side trim panel in foam film and circular-knit
    doors 0A2 4 doors
    TV reception/digital radio reception QV0 without TV/digital radio reception
    Speedometer cable and seal 8CC Speedometer sensor without seal (electronic speedometer sensor)
    Front underbody guard 1SA Without additional front underbody guard
    Identification plates 1EB without identification plate
    Two-way radio installation preparation 9D0 without prepared for two way radio system
    Front seats Q2J convenience seat
    Rear seat catch 6QB Locking rear seat catch
    Preparation for rotating beacon/siren combination 9F0 Without preparation for rotating beacon/siren combination
    Telephone / telematics 9W0 Without car phone preparation/ installation
    Additional warning lights 9TB Additional warning lights (door area)
    LongLife Service Regime QG0 without service interval extension
    Heat accumulator system/auxiliary heater 7E0 W/o heat accumulator/auxiliary heating
    Windshield Glass 4GC Windshield in heat-insulating glass with colourstripe
    Washer fluid level indicator 8W1 Washer fluid level indicator
    floor mats 0TD Front and rear floor mats
    Additional body panels, side 6EA Without additional side body covers (stone guard)
    Additional child seat anchors 3B2 Child seat anchors acc. to Australian requirements
    Zündanlaß/Schloß-Sperrsystem/ Elektrische Lenksäulenverriegelung 0RB Ignition/starter switch locking system
    Additional tunnel cover 4J1 Floor tray, extension center console
    Additional dust seals 6U0 Without additional seals outside
    Last edited by Uwe; 03-13-2018 at 09:10 PM. Reason: CODE tags
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  11. #18
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    ended up being the cluster, can portion shorted to k line.

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  13. #19
    NostraJackAss Jack@European_Parts's Avatar
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    We have those 2000 Beetle new clusters to replace the dog doo design cluster you had if interested.

    Did you find coolant at the connectors?

    Follow up auto-scan please?
    European Parts Emporium/Performance / Immobilizer Solutions EPE
    Certified Master Trained NY/BAR/BAD 7076062/ASE/SAE/NASTF Legal Factory Authorized/Licensed GeKo/FaZit # 403738
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  14. #20
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    its a customer vehicle, purchased a new replacement. getting it adapted now. I will see if I can dig up an autoscan from it

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