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Thread: Audi A5 - Retrofiting ACC triggers strange errorcode 00526 008 from trailer ECU J345

  1. #1
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    Question Audi A5 - Retrofitting ACC triggers strange errorcode 00526 008 from trailer ECU J345

    Hi All,

    Ive just finished retrofitting ACC (installed new J428 and upgraded J527 and J285) on my Audi A5 2013 succesfully, but just after i now receive errorcode 00526 008 from trailer ECU J345, indicating that my brake switch is periodically defect (I can clear the DTC but it returns if i use the ACC ) ? I think i have verified the trailer coding on all modules but im not sure if anything in terms of ACC is to be coded for the trailer module itself as i have not been able to find any detailed documentation ?

    Hopefully somebody can help me out ?

    Below is my latest VCDS scan:

    Code:
    Sunday,23,August,2015,17:49:31:21781
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64(VMWare)
    VCDS Version 15.7.0.1 (x64)
    Data version: 20150729
    www.Ross-Tech.com
    
    Dealer/Shop Name: Audi A5 XXXXXXX
    
    VIN: WAUZZZ8F9DN011417   License Plate: 
    Mileage: 18220km-11321mi   Repair Order: 
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: 8F (8R0)
    Scan: 01 03 05 08 09 10 13 15 16 17 19 20 26 3C 42 44 46 47 52 53
              56 5F 62 69 72
    
    VIN: WAUZZZ8F9DN011417   Mileage: 18220km-11321miles
    
    01-Engine -- Status: OK 0000
    03-ABS Brakes -- Status: OK 0000
    04-Steering Angle -- Status: OK 0000
    05-Acc/Start Auth. -- Status: OK 0000
    08-Auto HVAC -- Status: OK 0000
    09-Cent. Elect. -- Status: OK 0000
    10-Park/Steer Assist -- Status: OK 0000
    13-Auto Dist. Reg -- 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
    20-High Beam Assist. -- Status: OK 0000
    26-Auto Roof -- Status: OK 0000
    3C-Lane Change -- Status: OK 0000
    42-Door Elect, Driver -- Status: OK 0000
    44-Steering Assist -- Status: OK 0000
    46-Central Conv. -- Status: OK 0000
    47-Sound System -- Status: OK 0000
    52-Door Elect, Pass. -- Status: OK 0000
    53-Parking Brake -- Status: OK 0000
    56-Radio -- Status: OK 0000
    5F-Information Electr. -- Status: OK 0000
    62-Door, Rear Left -- Status: OK 0000
    69-Trailer -- Status: Malfunction 0010
    72-Door, Rear Right -- Status: OK 0000
     
    -------------------------------------------------------------------------------
    Address 01: Engine (J623-CJEB)       Labels: 06L-906-264-CJE.clb
       Part No SW: 8K0 906 264     HW: 8K0 906 264 
       Component: 1.8l R4 TFSI  H07 0007  
       Revision: --H07---    
       Coding: 22190012245401022000
       Shop #: WSC 45328 000 104857
       ASAM Dataset: EV_ECM18TFS0218K0906264 002006
       ROD: EV_ECM18TFS0218K0906264.rod
       VCID: 6EEBDA06B1C2104EB4-803B
    
    No fault code found.
    Readiness: 1110 0001
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes (J104)       Labels: 8K0-907-379-V1.clb
       Part No SW: 8K0 907 379 CH    HW: 8K0 907 379 CH
       Component: ESP8 front    H09 0100  
       Revision: --------    Serial number: --------------
       Coding: 03DD4C
       Shop #: WSC 45328 123 104857
       VCID: 013191BA985C1F3659-8055
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 05: Acc/Start Auth. (J393)       Labels: 8K0-907-064-05.clb
       Part No SW: 8K0 907 064 GD    HW: 8K0 907 064 FD
       Component: BCM2 2.0      H12 0633  
       Revision: 00002001    
       Coding: 03A34000000000000000
       Shop #: WSC 02391 785 00200
       VCID: 78C7FC5ECB865EFE6E-802D
    
       Subsystem 1 - Part No SW: 8K0 959 754 H    HW: 8K0 959 754 H
       Component: FBSAUDIB8 IDG  H71 0083 
    
       Subsystem 2 - Part No SW: 8K0 905 852 E    HW: 8K0 905 852 E
       Component: J764 ELV MLB  H40 0046 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC (J255)       Labels: Redir Fail!
       Part No SW: 8K1 820 043 R    HW: 8K1 820 043 R
       Component: KLIMA 1 ZONE  H02 0121  
       Revision: A1000000    Serial number: 01020220130237
       Coding: 642302C000
       Shop #: WSC 02391 785 00200
       VCID: 37453F6286189186A7-8063
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect. (J519)       Labels: 8K0-907-063.clb
       Part No SW: 8K0 907 063 DF    HW: 8K0 907 063 DF
       Component: BCM1 1.0      H16 0103  
       Revision: 06016001    Serial number: 00000042302801
       Coding: 2600C0108074AFC00081400300001D0D431C238826090201000004000400020100000040000000
       Shop #: WSC 45328 000 104857
       VCID: 76DBF266C192288E7C-8023
    
       Subsystem 1 - Part No SW: 8F1 955 119     HW: 8K1 955 119   Labels: 1KX-955-119.CLB
       Component: WWS 280113  H07 0080 
       Coding: 00FD11
    
       Subsystem 2 - Part No SW: 8U0 955 559 B    HW: 8U0 955 559 B  Labels: 8U0-955-559.CLB
       Component: G397_RLFS  H06 0002 
       Coding: 02005D
    
       Subsystem 3 - Part No SW: 8K0 941 531 AS    HW: 8K0 941 531 AS
       Component: E1 - LDS  H03 0031 
    
       Subsystem 4 - Part No SW: 4G0 907 658 A    HW: 4G0 907 658 A
       Component: Humidity_Sens  H03 0002 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 10: Park/Steer Assist (J446)       Labels: 8K0-919-475.clb
       Part No SW: 8K0 919 475 AA    HW: 8P0 919 475 N
       Component: PARKHILFE 8K  H01 0081  
       Revision: 11001001    Serial number: 12531400800438
       Coding: 110002
       Shop #: WSC 12345 123 12345
       VCID: 78C7FC5ECB865EFE6E-802D
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 13: Auto Dist. Reg (J428)       Labels: None
       Part No SW: 8K0 907 561 B    HW: 8K0 907 561 B
       Component: ACC3          H09 0100  
       Serial number: 00000000000000
       Coding: 008189
       Shop #: WSC 06325 123 12345
       VCID: 3151017A687C4FB6E9-8065
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags (J234)       Labels: 8F0-959-655.clb
       Part No SW: 8F0 959 655 D    HW: 8F0 959 655 D
       Component: AirbagVW-AU10 H12 0430  
       Serial number: 003KGD80D1VJ  
       Coding: 30394135353130303030554A304C38463053
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_AirbaAU10SMEAU485 001004
       ROD: EV_AirbaAU10SMEAU485.rod
       VCID: 3941395AB80C87F651-806D
    
       Crash sensor for side airbag; driver side: 
       Serial number: 6334MSME7765042DH
    
       Crash sensor for side airbag; front passenger side: 
       Serial number: 6344MSME7775550FP
    
       Crash sensor for side airbag; rear; driver side: 
       Serial number: 6352QSME69291674L
    
       Crash sensor for side airbag; rear; passenger side: 
       Serial number: 6362QSME47291962I
    
       Crash sensor for front airbag; driver side: 
       Serial number: 63732SME6D294B528
    
       Crash sensor for front airbag; front passenger side: 
       Serial number: 63832SME6B290C401
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel (J527)       Labels: 8K0-953-568.clb
       Part No SW: 8K0 953 568 M    HW: 8K0 953 568 M
       Component: Lenks.Modul   H04 0005  
       Revision: --------    Serial number: 90372MHG000CC 
       Coding: 0000DE
       Shop #: WSC 06325 123 12345
       VCID: 44BF58AEC7CECA1E32-8011
    
       Component: E221 - MFL  H03 0004 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments (J285)       Labels: 8T0-920-xxx-17.clb
       Part No SW: 8T0 920 930 H    HW: 8T0 920 930 H
       Component: KOMBIINSTR.   H09 0551  
       Revision: 00000000    Serial number: GDE35J6AA     
       Coding: 0FF7180007010008010101
       Shop #: WSC 00017 780 00200
       VCID: 3B4D2352BA30B5E643-806F
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway (J533)       Labels: 8T0-907-468.clb
       Part No SW: 8R0 907 468 P    HW: 8R0 907 468 D
       Component: GW-BEM 5CAN-M H11 0055  
       Revision: 1Z100027    Serial number: 2741Z1312780DE
       Coding: 80CF00FF00
       Shop #: WSC 02391 785 00200
       VCID: 4CAF708EEF9E025EFA-8019
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 20: High Beam Assist. (J844)       Labels: 8K0-857-511.clb
       Part No SW: 8T0 857 511 AD    HW: 8T0 857 511 AD
       Component: FLA           H04 0012  
       Revision: AA001002    
       Coding: 02018A64747464545425363E00
       Shop #: WSC 02391 785 00200
       VCID: 7CCFE04EFFBE72DE0A-8029
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 26: Auto Roof        Labels: None
       ASAM Dataset: EV_ Unknown
       ROD: N/A
       VCID: 559995EA3454439655-8001
    
    No ASAM data for: "EV_" (AU48) 
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 3C: Lane Change        Labels: None
       Part No SW: 8K0 907 566 F    HW: 4L0 907 566 B
       Component: J0769_SWA_MasterH01 0010  
       Revision: 00H01000    Serial number: 6PZ 009 014-13
       Coding: 0010105
       Shop #: WSC 00000 785 00200
       VCID: 3A432656750A8CEE58-806F
    
       Subsystem 1 - Part No: 8K0 907 568 F
       Component: J0770_SWA_Slave_H01 0010
    
       Subsystem 2 - Serial number: 6PZ 009 014-33
    
       Subsystem 3 - Serial number: 5F16.08.0800H010003CD10130˙
    
       Subsystem 4 - Serial number: D10130˙
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver (J386)       Labels: 8K0-959-793.clb
       Part No SW: 8T0 959 793 P    HW: 8T0 959 793 G
       Component: TSG FA        H09 0304  
       Revision: --------    Serial number: --------------
       Coding: 011D42725008330C03
       Shop #: WSC 02391 785 00200
       VCID: 569B92E62152488E5C-8003
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 44: Steering Assist (J500)       Labels: 8K0-909-144.clb
       Part No SW: 8K0 909 144 F    HW: 8K0 909 144 B
       Component: RCEPS         H37 0507  
       Revision: 00001000    Serial number: 0021207452
       Coding: 100000000001
       Shop #: WSC 02391 785 00200
       ASAM Dataset: EV_RCEPSAU48X 008014
       ROD: EV_RCEPSAU48X.rod
       VCID: 345F086E9F6E7A9E82-8061
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv. (J393)       Labels: 8K0-907-064-46.clb
       Part No SW: 8K0 907 064 GD    HW: 8K0 907 064 FD
       Component: BCM2 2.0      H12 0633  
       Revision: 00002001    Serial number: 0300455090    
       Coding: 010006A000B900E08130033680000000
       Shop #: WSC 02391 785 00200
       VCID: 78C7FC5ECB865EFE6E-802D
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 47: Sound System (J525)       Labels: None
       Part No SW: 8F1 035 223 A    HW: 8F1 035 223 A
       Component: DSP Prem      H05 0030  
       Revision: 00005001    Serial number: 94833010375701
       VCID: 1F75F7C20EE8C9C64F-804B
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass. (J387)       Labels: 8K0-959-792.clb
       Part No SW: 8T0 959 792 P    HW: 8T0 959 792 G
       Component: TSG BF        H09 0304  
       Revision: --------    Serial number: --------------
       Coding: 011D40325008330C03
       Shop #: WSC 02391 785 00200
       VCID: 559995EA3C54439655-8001
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 53: Parking Brake (----)       Labels: 8K0-907-801-V2.clb
       Part No SW: 8K0 907 801 L    HW: 8K0 907 801 J
       Component: EPB-4         H01 0003  
       Revision: --------    Serial number: 10000000165545
       ASAM Dataset: EV_ParkiBrake 001027
       ROD: EV_ParkiBrake_AU48.rod
       VCID: 38473C5E83069EFEAE-806D
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio (R)       Labels: Redir Fail!
       Part No SW: 4G1 035 053 F    HW: 4G1 035 053 
       Component: Radio U Basic H41 0122  
       Revision: AB001007    Serial number: 226A-0D7705782
       Coding: 010003010000000101
       Shop #: WSC 02391 785 00200
       VCID: 2273FE363D9AE42E60-8077
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 5F: Information Electr. (J794)       Labels: 4E0-035-6xx-5F.clb
       Part No SW: 8R1 035 670 E    HW: 8R1 035 670 C
       Component: H-BNT-EU      H44 0793  
       Revision: --------    Serial number: 207G-0C7507049
       Coding: 130100030106E9ED3100A95E00000401040000000000000000
       Shop #: WSC 12345 123 12345
       VCID: 3559356A9C146396B5-8061
    
       Subsystem 1 - Part No: 8R0 060 884 BK
       Component: EUR 2014  1703 
    
       Subsystem 2 - Part No SW: 8R0 919 604     HW: 8R0 919 604 
       Component: DU7 High  H41 0104 
    
       Subsystem 3 - Part No SW: 8T0 919 611 K    HW: 8T0 919 611 B
       Component: E0380 Bedient  H02 0030 
    
       Subsystem 4 - Part No: 8R0 060 961 C
       Component: CD-Database  3638 
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 62: Door, Rear Left (J388)       Labels: 8K0-959-795.clb
       Part No SW: 8T0 959 795 F    HW: 8T0 959 795 F
       Component: TSG HL        H08 0304  
       Revision: --------    Serial number: --------------
       Coding: 010000300008370C03
       Shop #: WSC 02391 785 00200
       VCID: 4EAB7A861982304E94-801B
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 69: Trailer (J345)       Labels: 8K0-907-383.clb
       Part No SW: 8K0 907 383 E    HW: 8K0 907 383 E
       Component: Anhaenger     H09 0100  
       Revision: 1A001001    Serial number: 00000189413987
       Coding: 0100000000000000
       Shop #: WSC 00000 000 00000
       VCID: 365B32668112688EBC-8063
    
    1 Fault Found:
    00526 - Brake Light Switch (F) 
                008 - Implausible Signal - Intermittent
                 Freeze Frame:
                        Fault Status: 00101000
                        Fault Priority: 3
                        Fault Frequency: 20
                        Reset counter: 211
                        Mileage: 17713 km
                        Time Indication: 0
                        Date: 2015.08.19
                        Time: 20:15:25
    
    
    -------------------------------------------------------------------------------
    Address 72: Door, Rear Right (J389)       Labels: 8K0-959-794.clb
       Part No SW: 8T0 959 795 F    HW: 8T0 959 795 F
       Component: TSG HR        H08 0304  
       Revision: --------    Serial number: --------------
       Coding: 010000300008370C03
       Shop #: WSC 02391 785 00200
       VCID: 4EAB7A861982304E94-801B
    
    No fault code found.
    
    End-------------------------(Elapsed Time: 02:53)--------------------------
    Last edited by Uwe; 08-25-2015 at 07:09 PM. Reason: CODE tags

  2. #2
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    When I carried out an ACC retrofit recently on my S8 I too had an error for towing module that would not go away until the correct cluster was fitted and coded, then adapted have you adapted it to suit?

    I may be barking up the wrong tree though as my install didn't have a trailer module, so it was strange that I would get a fault for it.

  3. #3
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    Hi Delboy, Thank you for the reply. As written i added the radar (J428) and upgraded the steering wheel and instrument cluster (J527 and J285) to versions supporting the ACC. I have also coded all my modules for trailer but as ive posted, i can not code the trailer for ACC (maybe due to insufficient doc - i can however see that the meassurement blocks for the trailer module seem to have values for ACC but states its "not occupied" so maybe a cord/wire is missing ?) The ACC however runs without error in all matters (except for the trailer DTC) though i seem to have the same challange as you (read your posting), in regards to adjustment (moving target after driving between -0.8 ..+0.8). In this matter i seem to have a static vertical value 2 (adjusting the radar vertical and horisontal physically, only affects the horisontal value 1 in the meassurement valueblock 002 ). Do you also experience that in terms of adjustment ? Br. Michel

  4. #4
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    Yes in all the readings I have taken from the radar control unit the Vertical maladjustment never changes, only the readings for horizontal, steering angle, and lateral yaw change with each drive cycle.

    I have noticed however that on drives with twisty roads the values are far from the 0.5 stated in ELSA, on journeys mostly of motorway etc the values are better, for the most part mine behaves ok but i think that the beam is still slightly to the right side.

    I intend to make a mirror plate to fit over the radar so i can adjust the radar unit using a laser level that you can buy from diy store.

    Here is a screenshot of my latest readings with the label file I made for the radar control unit.


  5. #5
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    Quote Originally Posted by delboy View Post
    Yes in all the readings I have taken from the radar control unit the Vertical maladjustment never changes, only the readings for horizontal, steering angle, and lateral yaw change with each drive cycle.

    I have noticed however that on drives with twisty roads the values are far from the 0.5 stated in ELSA, on journeys mostly of motorway etc the values are better, for the most part mine behaves ok but i think that the beam is still slightly to the right side.

    I intend to make a mirror plate to fit over the radar so i can adjust the radar unit using a laser level that you can buy from diy store.

    Here is a screenshot of my latest readings with the label file I made for the radar control unit.

    Hi del, Your plan sounds as a good idea. Could you provide some more details on how you expect to do it, as id like to try it to (read about a DIY but i have only been able to find the desc of the radar valueblocks and DIYs using WAS testers) ?

    By the way, wathch out for your current value. When i adjusted my radar it ended at somepoint above 0.9 and then it locked up with the misadjustment DTC code and another DTC code saying it was defect. At that point the misadjustment DTC it could only be cleared when it was adjusted to be below 0.8. The defect code only disappered when i disconnected/connected the battery (i was close to buying a new radar unit as the defect DTC appeared permanent ).

  6. #6
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    You can see all the steps I took here in this thread, I can't say for sure if your radar has the same measuring blocks as the one in my car but doing a comparison of the various screens you may be able to determine what your blocks are too, if they are the same you can apply the label file thats in that thread, but beware that its not complete as far as adaptations etc and the coding info relates to A8 D3 not your car.

    You can comment out the coding section of the file so its not presented to you in VCDS.

    As for your trailer fault have you checked that the trailer wiring socket is not got any issues?

  7. #7
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    What a great and impressive DYI work you have done. Your posting on http://forum.a8parts.co.uk/showthread.php?t=10419 will help out a lot of people. I wish i had read it before i started doing mine - it would have saved me a lot of time i think. The work i've done however seems very simular on the A5 except for partnumbers and ECU locations of course.
    As soon as i have some spare time i will dig deeper into the adjustment you have described and see if i missed something important.

    However, my question to you was regarding the mirror and laser you described, but looking at your radar picture it seems as the A8 radar does not have a mirror mounted permanent like mine ? If so, thats is what confused me as i thought you would use a laser having 2 mirrors (I plan to setup a fixed laser approximately 500m in front of my car and then let it hit my permanent mounted radar mirror and adjust untill the laser allmost hits itself - i guess that what you also planned ?).

    Regarding my trailer problem - My trailer ECU works perfect using trailer physically (factory mounted and coded - i only had to apply coding to the radar and the parts i have upgraded/replaced) and the DTC i get only arise when i use ACC and use the breaks at some point. I have checked the diagrams for other models and they all indicate that the communication between the trailer ECU and other ECUs communicate via the CAN bus so missing wires should not be an issue. I therefore suspect that the trailer ECU needs some coding but i hav not been able to find any docs besides coding the trailertype (manuel/electric). I therefore made my posting hoping that somebody knows what all the bits are for - seems as only 0100000000000000 and 0200000000000000 is documented from what i can find.

  8. #8
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    Hi Michel,
    replying to this old thread and hope you resolved it in the meantime. I have a European VW Sharan originally equipped with ACC and a trailer, but receiving same error. The brake light switch and its plug was already replaced by the dealer, but the error still happens occasionally. It is less than before, but still exists. Any help from you is much appreciated. The dealer is running out of ideas what might be causing it.

    Thanks, Nipro

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