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Thread: Desperate need of help Audi 8E Brake light fault

  1. #1
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    Desperate need of help Audi 8E Brake light fault

    Hi All

    new to this forum , we have never been caught out anything like this but as Audi have no record of this and i cannot find any thing and nothing makes sense .

    ok so we had brake light switch fault 00526 quick check with multi meter , so satisfied it was faulty ordered new one its a superseded part , fitted new part fault still on the system , checked with multi meter and the switch is working correctly this lead to further investigation , this is a two sided switch with 4 wires before anybody asks yes in every system abs/engine ecu, live data can be viewed and only one side is at fault , this is the red/brown + feed red/black signal wire
    so i have 12+ in the wires that should with one closed side sending 12+ back to abs until brake is pressed , the red/black wire should be 0v until brake pressed and then should be 12+ signal to abs ecu
    so once the new switch was fine i check the wires further, and i have 7v on the red/black signal return wire , chased all the wires for a short to the abs ecu , were right hand drive over here , so in the pass side foot well i opened the wire connection plug , with the plug open i checked from here back to the brake switch was checked and had in or around 6.56v in it so i was sure i had a wire issue , checked the other side to the abs ecu with the connection remade and pin red/black removed we had 8v so satisfied also had a wire issue on this side too
    when the circuit is remade the voltage drops to 7v
    after serious tracing i found what you see below which is wired in to the red/brown deliberately putting reduced voltage into the red/black and with the pin removed from the abs ecu i find the ecu is in fact sending out 8v on a signal pin which should accept 0 or 12v
    this is not a one off i have found the same in another a4 same year and i have now tested 3 abs ecu's from one with and with out the capacitor wired in to the brake light switch
    id say the extra faults in abs are due to pluggin and out ecu

    Code:
    Thursday,09,March,2017,21:13:15:34799
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86
    VCDS Version: 17.1.3.0
    Data version: 20170220 DS267.3
    www.Ross-Tech.com
    
    Dealer/Shop Name: GUNT TUNING
    
    VIN: WAUZZZ8E45A076501   License Plate: 
    
    
    Chassis Type: 8E (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))
    Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65
              67 69 75 76 77
     
    VIN: WAUZZZ8E45A076501   Mileage: 270630km-168161miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 038-906-019-AVF.lbl
       Part No: 038 906 019 LJ
       Component: 1,9l R4 EDC 0000SG  5934  
       Coding: 00002
       Shop #: WSC 06335  
       VCID: 6AD0D60316F8061157-4B32
       WAUZZZ8E45A076501     AUZ6Z0D0303555
    
    1 Fault Found:
    16955 - Brake Switch (F) 
                P0571 - 35-00 - Implausible Signal
    Readiness: 0 0 1 1 1 
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 8E0-614-517.lbl
       Part No: 8E0 614 517 
       Component: ABS/ESP front       4529  
       Coding: 00000
       Shop #: WSC 00000  
       VCID: 65CAA53FFFE629697A-515A
    
    3 Faults Found:
    01044 - Control Module Incorrectly Coded 
                35-00 -  - 
    00526 - Brake Light Switch (F) 
                36-00 - Open Circuit
    00778 - Steering Angle Sensor (G85) 
                66-10 - Not Matched - Intermittent
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 8E0-820-043.lbl
       Part No: 8E0 820 043 AC
       Component:   A4 Klimaautomat   1424  
       Coding: 00000
       Shop #: WSC 06335  
       VCID: 62C0BE23EEC85E519F-5178
    
    3 Faults Found:
    00819 - High Pressure Sensor (G65) 
                30-10 - Open or Short to Plus - Intermittent
    00819 - High Pressure Sensor (G65) 
                07-10 - Signal too Low - Intermittent
    01330 - Central Control Module for Central Convenience (J393) 
                49-10 - No Communications - Intermittent
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels: 8E0-907-279-8E2.lbl
       Part No: 8E0 907 279 C
       Component: int. Lastmodul  RDW 0606  
       Coding: 00001
       Shop #: WSC 06335  
       VCID: 32600E63FEA88ED12F-4B32
    
    3 Faults Found:
    01330 - Central Control Module for Central Convenience (J393) 
                49-10 - No Communications - Intermittent
    01326 - Control Module for Multi-Function Steering Wheel (J453) 
                49-10 - No Communications - Intermittent
    01312 - Powertrain Data Bus 
                79-10 - Please Check Fault Codes - Intermittent
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 8E0-959-655-84.lbl
       Part No: 8E0 959 655 J
       Component: Airbag 8.4EP        1002  
       Coding: 0011602
       Shop #: WSC 06335 000 00000
       VCID: 3E782A536AF05AB1DB-515A
    
    4 Faults Found:
    01228 - Airbag Cut-Off Switch for Passenger Side (E224) 
                010 - Open or Short to Plus - MIL ON
    01228 - Airbag Cut-Off Switch for Passenger Side (E224) 
                010 - Open or Short to Plus - MIL ON
    01739 - Crash Sensor for Front Airbag; Pass. Side (G284) 
                011 - Open Circuit - Intermittent
    01218 - Side Airbag Igniter; Passenger Side (N200) 
                001 - Upper Limit Exceeded - MIL ON
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel        Labels: 8E0-953-549.lbl
       Part No: 8E0 953 549 S
       Component: LenksŠulenmodul     0611  
       Coding: 01001
       Shop #: WSC 06335  
       VCID: 438E5BA751123759B4-4B18
    
    2 Faults Found:
    01330 - Central Control Module for Central Convenience (J393) 
                49-10 - No Communications - Intermittent
    01332 - Door Control Module; Passenger Side (J387) 
                49-10 - No Communications - Intermittent
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 8E0-920-9xx-8E2.lbl
       Part No: 8E0 920 950 M
       Component: KOMBI+WEGFAHRS. RB4 D42  
       Coding: 00401
       Shop #: WSC 00186  
       VCID: 336E0B6701B287D924-5178
       WAUZZZ8E45A076501     AUZ6Z0D0303555
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 45: Inter. Monitor        Labels: 8E0-951-177.lbl
       Part No: 8E0 951 177 
       Component: Innenraumueberw.   0704  
       Coding: 00001
       Shop #: WSC 00000  
       VCID: 6BDED30719021F192C-513C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels: 8E0-959-433-MAX.clb
       Part No: 8E0 959 433 BC
       Component: KomfortgerŠt T3B    1512  
       Coding: 06859
       Shop #: WSC
    Last edited by Uwe; 03-23-2017 at 02:31 PM. Reason: CODE tags

  2. #2
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    [IMG]IMG_2675.JPG[/IMG]

    Last edited by Uwe; 03-23-2017 at 02:31 PM. Reason: fixed in-lin image

  3. #3
    Benevolent Dictator Uwe's Avatar
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    Moving to Car Repair Support.

    -Uwe-
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  4. #4
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    thanks for the help

  5. #5
    NostraJackAss Jack@European_Parts's Avatar
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    Hello OP and welcome to the VCDS forum.

    WTF is that in that wiring.........?
    Are you looking to start a fire?

    Please correct the FOD and install the correct parts for lights and wiring as per the Etka & RTFB using WD in repair manual.



    That's not OEM............ correct it or go buy some marshmallows!

    TUV what what what !
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
    www.FixMyEuro.com <<<<<CLICK HERE! or vwemporium@aol.com ( JPPSG & Unverified members need not PM me & Please don't email or call facility for free tech support...use the forum )
    Getting you CONTROL again of your property - TAKE IT! In Conjunction with.........

  6. #6
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    sorry to say it is OE and i have now found it in 3 out of 8 ive checked in this year , every one identical and identical in every mannor heat shrink wiring and distance its placed from the switch .
    this is my point there is no repair manual to follow because none show this or a flow chart to test
    i had a bit of time yesterday , and removed more of the dash to get room , so i got brave and cut the red/black wire ecu side of the resistor/coil imput , tested and it does not match the one i cut from another car but the 8v is still in the loom , remove pin from abs ecu still there remove pin from engine ecu and its gone but the engine and abs ecu are bot placing 8v in the signal return red/black from the brake light switch , so what happened did something fry both ecu's and the resister , ive used 3 different abs ecu and all the same but the engine ecu was still implace at the time if i replace bith who is to say what will happen do i need to wire back in this set up in the pic

  7. #7
    NostraJackAss Jack@European_Parts's Avatar
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    European Parts Emporium/Performance / Immobilizer Solutions EPE
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    Specializing in Custom Services IE: "welding-fabrication" / EPA-SMOG Update or Pass-Thru-Programming / Data Transfer / Immobilizers & OEM Quality Parts
    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
    www.FixMyEuro.com <<<<<CLICK HERE! or vwemporium@aol.com ( JPPSG & Unverified members need not PM me & Please don't email or call facility for free tech support...use the forum )
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  8. #8
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    6.5 yrs in Audi VW ALL normal procedures followed as i said they have nothing documented on it and it would be some one with experience of it who i'd say will be the only one able to shed light , thanks for the imput but I've 20 yrs at nothing but problems and never seen anything especially something undocumented

  9. #9
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by Jack@European_Parts View Post
    TUV what what what !
    Noise suppression circuit.

    Question is: Where exactly? And why?

    -Uwe-
    Lock-down of sick people: Quarantine
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  10. #10
    NostraJackAss Jack@European_Parts's Avatar
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    Noise suppression circuit.

    Question is: Where exactly? And why?

    -Uwe-
    Yeah poor deployment of a Ferrite stick inverted.



    Op are you absolutely sure all fuses are OK?

    I suspect there is a blown one............or an open bay.
    Last edited by Jack@European_Parts; 03-26-2017 at 12:57 PM.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
    Certified Master Trained NY/BAR/BAD 7076062/ASE/SAE/NASTF Legal Factory Authorized/Licensed GeKo/FaZit # 403738
    Specializing in Custom Services IE: "welding-fabrication" / EPA-SMOG Update or Pass-Thru-Programming / Data Transfer / Immobilizers & OEM Quality Parts
    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
    www.FixMyEuro.com <<<<<CLICK HERE! or vwemporium@aol.com ( JPPSG & Unverified members need not PM me & Please don't email or call facility for free tech support...use the forum )
    Getting you CONTROL again of your property - TAKE IT! In Conjunction with.........

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