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Thread: Audi A6 2006 F4 Rear exterior lighting problem.

  1. #1
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    Audi A6 2006 F4 Rear exterior lighting problem.

    Hi all i am looking for a bit of advice with this job.
    The vehicle had been off the road for a few months. It has been at other repair shops before coming to me.
    It had ABS and engine management faults that were easy enough to fix. And the customer asked me to
    fix a number of lighting faults as well. I left that untill last as i thought that would be easy enough,

    I found a few faults, blown bulbs and bad connections but i am left with a fault that is causing a problem.
    The car is an A6 avant and has light clusters on the rear wing/fender and the tailgate/trunk lid. The problem is
    the left hand outer light unit was full of water and the stop/tail light did not work. Also the tail light bulbs
    on the tailgate are illuminating but very dimly.

    I replaced the left hand outer light and bulb holder as it was obviosly letting in water and the bulb holder was corroded
    However the light still did not work. There are two bulbs in this light unit one is a direction indicator and it functions normally.

    The other bulb is the one causing the problem. Its a single filament 21 watt bulb that when lit with full battery voltage lights up as the stop light bulb. And it does that correctly.
    But swithched on as the Tail light with a lower voltage. It comes on and flashes twice then goes out and flags the fault code. It will also do this if the brake is applied and it is already lit full voltage.

    Now i know the comfort module must have a test stratagy to protect the circuit rather than fuses.
    and i know the single filament bulb should light dim or bright depending on function, Tail light or brake light, Therefore two different voltages. I tested all the wiring from the comfort module and all seemed ok but to be sure i cut and swapped the two wires for the left and right side at the comfort module plug and the fault moved to the opposite side.
    it also had an after market towbar addaptor. Which i removed just in case.

    So at this point it looked like to me that the control module had a fault. so i got a second hand one to try.
    With matching part number. after fitting it looked like the fault was fixed and the other four bulbs on the tailgate were now brighter matching the outer one but the coding was obviously wrong as it had new faults with the direction indicators. So i altered the coding to match the original and we are back to the same fault as before.

    So It looks to me like the coding has been wrong from the start as the car is righthand drive and the existing
    code before i touched it is not high enough to include RHD. I have tried altering the coding to include RHD that made
    no difference. There are other options that the car has definately not got - HID front lights or LED rear lights for instance. But there are other options that i am unsure of.
    I've refitted the original module as the replacement made no difference but also had component protection enabled.

    Could the fault just be incorrect programming? if so how do i find the correct coding? Or do I just have to try all the options. And if it is incorrect coding, could that happen by itself?

    Thanks for reading.
    Alan.

    Code:
    Thursday,02,April,2020,19:05:08:05279
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x86
    VCDS Version: 19.6.2.2
    Data version: 20200210 DS308.0
    www.Ross-Tech.com
    
    
    VIN: WAUZZZ4F66N135251   License Plate: SC06 GOA
    Mileage: 269670km-167565mi   Repair Order: 
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: 4F (4F0)
    Scan: 01 03 05 07 08 09 0E 15 16 17 19 1E 37 42 46 47 4F 52 53 56
              61 62 72 76
    
    VIN: WAUZZZ4F66N135251   Mileage: 269670km-167565miles
    
    00-Steering Angle Sensor -- Status: OK 0000
    01-Engine -- Status: Malfunction 0010
    03-ABS Brakes -- Status: OK 0000
    05-Acc/Start Auth. -- Status: OK 0000
    07-Control Head -- Status: OK 0000
    08-Auto HVAC -- Status: Malfunction 0010
    09-Cent. Elect. -- Status: OK 0000
    0E-Media Player 1 -- Status: OK 0000
    15-Airbags -- Status: OK 0000
    16-Steering wheel -- Status: OK 0000
    17-Instruments -- Status: OK 0000
    19-CAN Gateway -- Status: OK 0000
    1E-Media Player 2 -- Status: OK 0000
    25-Immobilizer -- Status: OK 0000
    37-Navigation -- Status: OK 0000
    42-Door Elect, Driver -- Status: OK 0000
    46-Central Conv. -- Status: Malfunction 0010
    47-Sound System -- Status: OK 0000
    4F-Centr. Electr. II -- Status: OK 0000
    52-Door Elect, Pass. -- Status: OK 0000
    53-Parking Brake -- Status: OK 0000
    56-Radio -- Status: OK 0000
    61-Battery Regul. -- Status: Malfunction 0010
    62-Door, Rear Left -- Status: OK 0000
    72-Door, Rear Right -- Status: OK 0000
    76-Park Assist -- Status: OK 0000
     
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 03G-906-016-BLB.clb
       Part No SW: 03G 906 016 HS    HW: 028 101 255 7
       Component: R4 2,0L EDC G000SG  9673  
       Revision: --H02---    Serial number:               
       Coding: 0000072
       Shop #: WSC 66565 257 00032
       VCID: 7BF1AF083AF1FF97F0-802E
    
    2 Faults Found:
    005512 - Engine Mount Solenoid Valves (N144/N145) 
                   P1588 - 000 - Open Circuit
                 Freeze Frame:
                        Fault Status: 01100000
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.03.31
                        Time: 15:17:24
    
                 Freeze Frame:
                        RPM: 0 /min
                        Speed: 0.0 km/h
                        Load: 0.0 %
                        Voltage: 11.70 V
                        Bin. Bits: 00101000
                        Torque: 0.0 Nm
                        Torque: 351.4 Nm
    
    005697 - Please check DTC Memory of A/C Controller 
                   P1641 - 000 - 
                 Freeze Frame:
                        Fault Status: 01100000
                        Fault Priority: 6
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.03.31
                        Time: 15:17:29
    
                 Freeze Frame:
                        RPM: 0 /min
                        Speed: 0.0 km/h
                        Load: 0.0 %
                        Voltage: 11.70 V
                        Bin. Bits: 00101000
                        Temperature: 11.7°C
                        (no units): 16.0
    
    Readiness: 0 0 0 1 1 
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 4F0-910-517.clb
       Part No SW: 4F0 910 517 K    HW: 4F0 614 517 K
       Component: ESP 8.0 front   H04 0090  
       Revision: 00000000    Serial number: 00000000000000
       Coding: 0020855
       Shop #: WSC 02325 785 00200
       VCID: 2C535C548F1FA82F29-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 05: Acc/Start Auth.        Labels:. 4F0-910-852.clb
       Part No SW: 4F0 910 852     HW: 4F0 905 852 B
       Component: FBSAUDIC6 ELV   H31 0220  
       Revision: 31050601    Serial number: 10604000325884
       Coding: 0000145
       Shop #: WSC 00847 210 80521
       VCID: 63C1F768A2412757D8-8036
    
       Subsystem 1 - Part No: 4F0 910 131 D
       Component: FBSAUDIC6 EZS   H45 0070
    
       Subsystem 2 - Part No: 4F0 910 220 D
       Component: FBSAUDIC6 IDG   H39 0040
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 07: Control Head        Labels: Redir Fail!
       Part No SW: 4F0 910 769 B    HW: 4F0 035 769 B
       Component: MMI Cockpit     H55 0010  
       Revision: C51500BE    Serial number: AUZ6Z3ECB936F3
       Coding: 0100102
       Shop #: WSC 02323 785 00200
       VCID: 2C535C548F1FA82F29-8078
    
       Subsystem 1 - Part No: 4F0 910 609 E
       Component: Bedienteil MMIC6H03 0050
    
       Subsystem 2 - Serial number: 00000000311409
    
       Subsystem 3 - Serial number: 0110.01.060000000100011190ÿ
    
       Subsystem 4 - Serial number: 011190ÿ
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 4F0-910-043.clb
       Part No SW: 4F0 910 043     HW: 4F2 820 043 H
       Component: KLIMABETAETIGUNGH12 0170  
       Revision: 00000030    Serial number: 00000000220187
       Coding: 0001300
       Shop #: WSC 02325 785 00200
       VCID: 5BB1CF889A311F9790-800E
    
    2 Faults Found:
    01592 - Air Quality Sensor (G238) 
                010 - Open or Short to Plus
                 Freeze Frame:
                        Fault Status: 01101010
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 85
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.04.02
                        Time: 17:43:40
    
                 Freeze Frame:
                        Temperature: 12.0°C
    
    00256 - A/C Pressure/Temperature Sensor (G395) 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 85
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.04.02
                        Time: 17:43:40
    
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels: 4F0-910-279.lbl
       Part No SW: 4F0 910 279 D    HW: 4F0 907 279 
       Component: ILM Fahrer      H15 0190  
       Revision: 00000000    Serial number: 4F0907279     
       Coding: 0000101
       Shop #: WSC 02335 785 00200
       VCID: 2A5F5A4C85EBB61FDB-807E
    
       Subsystem 1 - Part No: 4F2 910 113 C  Labels: 1KX-955-119.CLB
       Component: Wischer AudiC6  H11 0040  
       Coding: 00022800
       Shop #: WSC 02335  
    
       Subsystem 2 - Part No: 4E0 910 557   Labels: 8K0-955-559.CLB
       Component: REGENLICHTSENSORH10 0050  
       Coding: 00141886
       Shop #: WSC 02335  
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 0E: Media Player 1        Labels: Redir Fail!
       Part No SW: 4F0 910 769 B    HW: 4F0 035 769 B
       Component: MMI Cockpit     H55 0010  
       Revision: C51500BE    Serial number: AUZ6Z3ECB936F3
       Coding: 0100102
       Shop #: WSC 02323 785 00200
       VCID: 2C535C548F1FA82F29-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 4F0-910-655-8R.clb
       Part No SW: 4F0 910 655 E    HW: 4F0 959 655 B
       Component: 4E AIRBAG AUDI8RH29 0280  
       Revision: 08H29000    Serial number: 0037LD0CEHJK  
       Coding: 0013381
       Shop #: WSC 02325 785 00200
       VCID: 295DA54080EDBD07D2-807C
    
       Subsystem 1 - Serial number: 6332CSME0E23094F8
    
       Subsystem 2 - Serial number: 6342CSME0E453D618
    
       Subsystem 3 - Serial number: 6352QSME087120757
    
       Subsystem 4 - Serial number: 6362QSME08714A75K
    
       Subsystem 5 - Serial number: 63734SME086E1F3BG
    
       Subsystem 6 - Serial number: 63834SME08681B777
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel        Labels: 4F0-910-549.lbl
       Part No SW: 4F0 910 549     HW: 4F0 953 549 A
       Component: Lenksäulenmodul H07 0230  
       Revision: 00H07000    Serial number: 90026053510119
       Coding: 0102042
       Shop #: WSC 02323 785 00200
       VCID: 66C7EE7C5173527F3F-8032
    
       Subsystem 1 - Part No: XXXXXXXXXXX 
       Component: Lenkradmodul    H07 0090
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 4F0-910-xxx-17.lbl
       Part No SW: 4F0 910 900 A    HW: 4F0 920 950 L
       Component: KOMBIINSTR. M73 H11 0660  
       Revision: 00200000    Serial number: 4RA72VWD5     
       Coding: 2308443
       Shop #: WSC 00999 067 57207
       VCID: 1E37869CC9A34ABFB7-804A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway        Labels:. 4F0-910-468.clb
       Part No SW: 4F0 910 468 A    HW: 4F0 907 468 D
       Component: Gateway         H11 0070  
       Revision: 11          Serial number: 13008061050171
       Coding: ECEE53C43B2104
       Shop #: WSC 02334 785 00200
       VCID: 2759A37896F98B77C4-8072
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 1E: Media Player 2        Labels: 4E0-910-111.lbl
       Part No SW: 4E0 910 111 F    HW: 4E0 035 111 A
       Component: CD-Changer      H44 0470  
       Revision: 00000000    Serial number: AUZ5ZBG8234089
       Shop #: WSC 00000 000 00000
       VCID: 1C338C94DFBF58AF59-8048
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 37: Navigation        Labels: Redir Fail!
       Part No SW: 4F0 910 769 B    HW: 4F0 035 769 B
       Component: MMI Cockpit     H55 0010  
       Revision: C51500BE    Serial number: AUZ6Z3ECB936F3
       Coding: 0100102
       Shop #: WSC 02323 785 00200
       VCID: 2C535C548F1FA82F29-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver        Labels: 4F0-910-793-42.lbl
       Part No SW: 4F0 910 793 E    HW: 4F0 959 793 E
       Component: TSG FA          H12 0080  
       Revision: 00-00000    
       Coding: 0003610
       Shop #: WSC 02327 785 00200
       VCID: 2C535C548F1FA82F29-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels:. 4F0-910-289.lbl
       Part No SW: 4F0 910 289 G    HW: 4F0 907 289 G
       Component: Komfortgeraet   H22 0170  
       Revision: 01700022    Serial number: 01009694450000
       Coding: 0000763
       Shop #: WSC 02335 785 00200
       VCID: 2E57565CB903DA3F07-807A
    
       Subsystem 1 - Part No: 1K0 951 605 C
       Component: LIN BACKUP HORN H03 1301
    
       Subsystem 2 - Part No: 4F0 910 177 
       Component: Innenraumueberw.H01 0020
    
    1 Fault Found:
    02738 - Bulb for Tail/Brake Light; Left 
                009 - Open or Short to Ground
                 Freeze Frame:
                        Fault Status: 01101001
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 85
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.04.02
                        Time: 17:58:50
    
    
    -------------------------------------------------------------------------------
    Address 47: Sound System        Labels: 4F0-910-223-AS.lbl
       Part No SW: 4F0 910 223 C    HW: 4F0 035 223 
       Component: Amp.-ASK        H10 0320  
       Revision: 33S00001    Serial number: 01001060202052
       Coding: 0000103
       Shop #: WSC 02335 785 00200
       VCID: 1E37869CC9A34ABFB7-804A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 4F: Centr. Electr. II        Labels: 4F0-910-280.lbl
       Part No SW: 4F0 910 280     HW: 4F0 907 280 A
       Component: ILM Beifahrer   H10 0080  
       Revision:             Serial number: 00000000175665
       Coding: 0001104
       Shop #: WSC 02323 785 00200
       VCID: 5EB7C69C89230ABFF7-800A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass.        Labels: 4F0-910-793-52.lbl
       Part No SW: 4F0 910 793 E    HW: 4F0 959 792 E
       Component: TSG BF          H12 0080  
       Revision: 00-00000    
       Coding: 0003610
       Shop #: WSC 02327 785 00200
       VCID: 2C535C548F1FA82F29-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 53: Parking Brake        Labels: 4F0-910-801.clb
       Part No SW: 4F0 910 801     HW: 4F0 907 801 
       Component: EPB  C63C0030   H03 0030  
       Revision: C63C0030    
       Coding: 0000111
       Shop #: WSC 02335 785 00200
       VCID: 5DB5C190842511A7EE-8008
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio        Labels: Redir Fail!
       Part No SW: 4F0 910 769 B    HW: 4F0 035 769 B
       Component: MMI Cockpit     H55 0010  
       Revision: C51500BE    Serial number: AUZ6Z3ECB936F3
       Coding: 0100102
       Shop #: WSC 02323 785 00200
       VCID: 2C535C548F1FA82F29-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 61: Battery Regul.        Labels: 4F0-910-181.lbl
       Part No SW: 4F0 910 181 E    HW: 4F0 915 181 A
       Component: J0644 BEM       H12 0590  
       Revision: 00000000    Serial number: 00000000184828
       Shop #: WSC 00838 210 00659
       VCID: 2341B768E2C1675798-8076
    
       Subsystem 1 - Part No: 4F0 915 105 C
       Component: von VA0  2512080097       
       Coding: 344630393135313035432056413032353132303830303937
       Shop #: WSC 00000 384 00290
    
    5 Faults Found:
    02272 - Quiescent Current Stage 1 
                000 - - - Intermittent
                 Freeze Frame:
                        Fault Status: 00100000
                        Fault Priority: 7
                        Fault Frequency: 2
                        Reset counter: 255
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.04.02
                        Time: 17:44:54
    
    02273 - Quiescent Current Stage 2 
                000 - -
                 Freeze Frame:
                        Fault Status: 01100000
                        Fault Priority: 7
                        Fault Frequency: 2
                        Reset counter: 255
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.04.02
                        Time: 17:48:04
    
    02276 - Quiescent Current Stage 5 
                000 - - - Intermittent
                 Freeze Frame:
                        Fault Status: 00100000
                        Fault Priority: 7
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.04.02
                        Time: 17:48:14
    
    02274 - Quiescent Current Stage 3 
                000 - - - Intermittent
                 Freeze Frame:
                        Fault Status: 00100000
                        Fault Priority: 7
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.04.02
                        Time: 17:54:45
    
    02277 - Quiescent Current Stage 6 
                000 - - - Intermittent
                 Freeze Frame:
                        Fault Status: 00100000
                        Fault Priority: 7
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 269671 km
                        Time Indication: 0
                        Date: 2020.04.02
                        Time: 17:54:56
    
    
    -------------------------------------------------------------------------------
    Address 62: Door, Rear Left        Labels: 4F0-910-795.lbl
       Part No SW: 4F0 910 795 E    HW: 4F0 959 795 E
       Component: TSG HL          H21 0050  
       Coding: 0003074
       Shop #: WSC 02327 785 00200
       VCID: 2E57565CB903DA3F07-807A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 72: Door, Rear Right        Labels: 4F0-910-795.lbl
       Part No SW: 4F0 910 795 E    HW: 4F0 959 794 E
       Component: TSG HR          H21 0050  
       Coding: 0003074
       Shop #: WSC 02327 785 00200
       VCID: 2E57565CB903DA3F07-807A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 76: Park Assist        Labels: 4Fx-910-283.lbl
       Part No SW: 4F0 910 283 B    HW: 4F0 919 283 B
       Component: Parkhilfe 4-Kan H09 0030  
       Revision: 00H09000    Serial number: 11720601003968
       Coding: 0000016
       Shop #: WSC 131071 1023 2097151
       VCID: 2341B768E2C1675798-8076
    
    No fault code found.
    
    End-------------------------(Elapsed Time: 02:44)--------------------------

  2. #2
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    Now i know the comfort module must have a test stratagy to protect the circuit rather than fuses.
    Alan, did you check each fuse in all fuse boxes individually? Also, check all connections the harness using a DMM. It would also help to ensure you have no earth/ground issues


    Could the fault just be incorrect programming? if so how do i find the correct coding? Or do I just have to try all the options. And if it is incorrect coding, could that happen by itself?
    You can try finding a reference scan for your vehicle here

    If that doesn't help, the folks over at Ross Tech can search if they have any documented scans for your car


    Also, please look at this link, not the same problem as yours but very similar

    ^^ You can try what's suggested in post #2

    Hope this helps!

    --gokarty

  3. #3
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    Hi, thanks for replying, I have replaced the complete light. The light works at full intensity when the brake is applied. And when the complete circuit from the module to the lamp has been swapped with its counterpart on the opposite side. The fault moved to the opposite side and the bad side works. I tested feeds and earths with dmm and power probe at the outset.
    I’m confident there is no feed or earth fault.

    The pins from the control module are pin 1 and pin 7 for left hand and right hand, both pins have two wires but only one wire in each is connected as if the harness is utilising the spare wires in other applications.
    Unless the wrong bulbs have been fitted some where else.

    Thanks again for looking.

  4. #4
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    Maybe I should have asked, will I be able to find info on coding or the as built information so I can select the correct coding for the vehicles vin.
    Using erWin
    I have seen posts for other coding issues where a list has been posted with information that looks like it could be from the RTFB
    Regards Alan

  5. #5
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    That coding definitely looks wrong. Can you post up the build sticker from the spare wheel well?

  6. #6
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    https://imgur.com/NiNpQqL



    I have found that if I change the code to, for example, with LED the 1 light that’s causing the problem then works as it should.
    But the car doesn’t have LEDs so off course other lights then work incorrectly. I have tried other alterations without success.
    I’d think I need to work out the correct code.
    Last edited by Pinpointdiag; 04-14-2020 at 09:38 AM. Reason: Fixed Image

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  8. #7
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    https://imgur.com/XhB6wAg


    This above from the car.

    And I found a pr decoder and got this but I am unsure if it’s any good as nothing seems to apply to the coding calculator
    I have never had any problem coding modules on VAG before. But I'm confused with this one.

    https://imgur.com/7NRfjS7









    Im not sure why these images are not showing up yet. The one in the previos post would not work yesterday and when ilooked today it was there.
    Last edited by Uwe; 04-14-2020 at 01:25 PM.

  9. #8
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    If you have not tried it already, try 0001019.

    Out of curiosity, what was the coding of the replacement module as delivered?

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  11. #9
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    Quote Originally Posted by Pinpointdiag View Post
    Im not sure why these images are not showing up yet. The one in the previos post would not work yesterday and when ilooked today it was there.
    Because you're linking to imgur pages rather than actual images. An image ends in .jpg, .png, or .gif

    I fixed your previous post, as well as he most recent one.

    -Uwe-
    Lock-down of sick people: Quarantine
    Lock-down of healthy people: Tyranny

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  13. #10
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    The fix.
    Thanks for correcting my attached photo’s Uwe.

    Yes I got the full list of pr codes from Erwin and I think the correct code is 0001019 as you say Mr M. Thanks for checking for me. However the fault was still present.

    The wiring to the light with the problem had to be good as when it was swapped at the module with its counterpart on the opposite side the fault stayed on the same pin. And moved to the other light. Proving the wiring. Earth etc.
    The wiring diagram showed the second wire at the pin was a redundant wire. Used for a high line version only.

    I then noticed if I put the car in reverse and the reversing lights were on the faulty bulb worked. And the code cleared. As soon as I knocked it out of reverse the code returned. Odd but possibly pointing to a bad earth.

    I had noticed the four bulbs on the tailgate looked slightly dimmer than the two on the wings, but the lenses of the outer light clusters are much clearer than the inner as if they have been replaced at some time. And all four inners looked the same. All these bulbs are 21w and have duel function from a single filament. Low light output is around 4 volts and you can here them humming so a PWM feed. Anyway previously I had discounted them as being anything to do with it as they were on different pins from the module.
    So I then had a closer look at them and found a bad earth at the inner left light cluster. And that was the cause of the problem.
    The inner right had tarnished bulb contacts on both bulbs. Different fault same effect. But not enough to switch off the other outer bulb.

    So it’s fixed, a high resistance fault on one light that still works causes another light with no fault to fail it’s self test and switch it’s self off. While the faulty one carries on working. Doh.

    Although the coding may have been incorrect it wasn’t anything to do with the fault. On the up side I found out about how to determine the coding from the build sticker and rtfm.
    Last edited by Pinpointdiag; 04-16-2020 at 04:18 AM.

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