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Thread: 1 Fault: 001393 - Brake Switch (F) P0571 - 008 - Implausible Signal

  1. #1
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    1 Fault: 001393 - Brake Switch (F) P0571 - 008 - Implausible Signal

    I'm posting this here for a specific problem I'm having with a 2007 VW Passat 2.5L 5-Cyl. engine conversion ... a brake light switch fault. I've had this fault from the beginning of this project and can't seem to get rid of it. (The ABS errors in the scan below are recent ... I had the Brake light fault long before the current ABS issues occurred).

    Today I cleared the fault for the umteenth time ... then I drove the car.

    Everything works fine ... for a while. The brake lights work ... the green foot peddle light on the dash goes off when the Brake peddle is depressed ... the cruise control turns on and "sets" fine on the freeway ... and depressing the brake peddle deactivates the cruise control fine.

    But today, after I had cleared the code, I drove with my VCDS open to Address 01: Engine (CBT) ... Fault Codes - 02 ... and watched for the Brake light switch fault to show up (don't know if VCDS faults show up in real-time). It took about 5 minutes of driving to get the fault to appear ... during that time I set the cruise ... applied the brakes ... used the turn signals ... turned on the headlights.

    I was trying to find anything that might set the fault ... but really found nothing ... other than simply pressing the brake peddle ... eventually.

    Any ideas as to why the switch would be fine for a while ... but throw a fault after about 5 minutes?

    Here's today's scan ...

    Code:
    Friday,07,July,2017,15:35:10:23114
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
    VCDS Version: 17.1.3.0 (x64)  HEX-V2 CB: 0.4336.4
    Data version: 20170320 DS267.7
    www.Ross-Tech.com
    
    
    VIN: WVWBA71K78W315062   License Plate: 
    
    
    Chassis Type: 1K (3C0)
    Scan: 01 02 03 08 09 15 16 17 19 1C 25 42 44 46 52 56 62 6D 72
    
    VIN: WVWBA71K78W315062   Mileage: 220550km-137043miles
    
    00-Steering Angle Sensor -- Status: OK 0000
    01-Engine -- Status: Malfunction 0010
    02-Auto Trans -- Status: Malfunction 0010
    03-ABS Brakes -- Status: Malfunction 0010
    08-Auto HVAC -- Status: Malfunction 0010
    09-Cent. Elect. -- 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
    1C-Position Sensing -- Status: OK 0000
    25-Immobilizer -- Status: OK 0000
    42-Door Elect, Driver -- Status: Malfunction 0010
    44-Steering Assist -- Status: OK 0000
    46-Central Conv. -- Status: OK 0000
    52-Door Elect, Pass. -- Status: OK 0000
    56-Radio -- Status: OK 0000
    62-Door, Rear Left -- Status: OK 0000
    6D-Trunk Elect. -- Status: OK 0000
    72-Door, Rear Right -- Status: OK 0000
    -------------------------------------------------------------------------------
    Address 01: Engine (CBT)       Labels: 06A-906-032-BGP.lbl
       Part No SW: 07K 906 032 BJ    HW: 07K 906 032 Q
       Component: 2,5l R5/4V      G   1567  
       Revision: 1NH01---    Serial number: VWX7Z0H33N97Z2
       Coding: 0000003
       Shop #: WSC 01279 785 00200
       VCID: 72BED2CB78AA85372BD-8026
    
    1 Fault Found:
    001393 - Brake Switch (F) 
                   P0571 - 008 - Implausible Signal
                 Freeze Frame:
                        Fault Status: 01101000
                        Fault Priority: 0
                        Fault Frequency: 1
                        Reset counter: 255
                        Mileage: 220546 km
                        Time Indication: 0
                        Date: 2017.07.07
                        Time: 14:42:25
    
                 Freeze Frame:
                        RPM: 646 /min
                        Load: 20.8 %
                        Speed: 4.0 km/h
                        Temperature: 80.0C
                        Temperature: 39.0C
                        Absolute Pres.: 960.0 mbar
                        Voltage: 13.462 V
    
    Readiness: 0110 1100
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 09G-927-750.clb
       Part No SW: 09G 927 750 HJ    HW: 09G 927 750 CJ
       Component: AQ 250 6F           1068  
       Revision: 00H38000    Serial number:               
       Coding: 0000072
       Shop #: WSC 08114 444 84076
       VCID: 005A88034606A7A72D9-8054
    
    1 Fault Found:
    01316 - ABS Control Module 
                004 - No Signal/Communication
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 1K0-907-379-MK60-F.lbl
       Part No SW: 1K0 907 379 AC    HW: 1K0 907 379 AC
       Component: ESP FRONT MK60      0101  
       Revision: 00H11001    
       Coding: 0021122
       Shop #: WSC 00066 000 00000
       VCID: 73B0D7CF07B08C3F20B-8026
    
    10 Faults Found:
    01309 - Power Steering Control Module (J500) 
                008 - Implausible Signal - Intermittent
    00778 - Steering Angle Sensor (G85) 
                000 -  -  - Intermittent
    01044 - Control Module Incorrectly Coded 
                008 - Implausible Signal
    01309 - Power Steering Control Module (J500) 
                004 - No Signal/Communication
    00778 - Steering Angle Sensor (G85) 
                004 - No Signal/Communication
    01315 - Transmission Control Module 
                004 - No Signal/Communication
    01317 - Control Module in Instrument Cluster (J285) 
                004 - No Signal/Communication
    01299 - Diagnostic Interface for Data Bus (J533) 
                004 - No Signal/Communication
    01314 - Engine Control Module 
                004 - No Signal/Communication
    00526 - Brake Light Switch (F) 
                008 - Implausible Signal
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 1K0-820-047.lbl
       Part No: 1K0 820 047 EB
       Component: Climatic PQ35   090 0505  
       Shop #: WSC 00000 000 00000
       VCID: 688AB0A34E767FE7859-803C
    
    1 Fault Found:
    00229 - Refrigerant Pressure 
                002 - Lower Limit Exceeded
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels: 3C0-937-049-23-H.lbl
       Part No SW: 3C0 937 049 Q    HW: 3C0 937 049 Q
       Component: Bordnetz-SG     H46 1501  
       Revision: 00H46000    Serial number: 00000005468122
       Coding: 008C0F0340041A00470A00000F00000000285D435C0000
       Shop #: WSC 05311 123 12345
       VCID: 372823DF5348201FDC3-8062
    
       Subsystem 1 - Part No: 3C1 955 119   Labels: 1KX-955-119.CLB
       Component: Wischer VW461  012  0503  
       Coding: 00063445
       Shop #: WSC 05311  
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 3C0-909-605.lbl
       Part No SW: 3C0 909 605 K    HW: 3C0 909 605 K
       Component: 0N AIRBAG VW8R  029 2521  
       Revision: 10029000    Serial number: 003A3P2W7PWA  
       Coding: 0012366
       Shop #: WSC 05311 000 08193
       VCID: 2E0606BBAC12E1D78F5-807A
    
       Subsystem 1 - Part No: 3C0 959 339 A
       Component: BF-Gewichtsens. 006 0002
    
       Subsystem 2 - Serial number: 00000000032EPS
    
       Subsystem 3 - Serial number: 0001.01.00000060000000000063
    
       Subsystem 4 - Serial number: 0000006332MSME0E716159E63
    
       Subsystem 5 - Serial number: 16159E6342MSME105B6074663
    
       Subsystem 6 - Serial number: B607466351HTS64IKQTM62763
    
       Subsystem 7 - Serial number: QTM6276361HTS6TLLE15C3U63
    
       Subsystem 8 - Serial number: E15C3U63727TS63IK2T6C3963
    
       Subsystem 9 - Serial number: 2T6C3963827TS63IKEPNQ25
    
       Subsystem 10 - Serial number: EPNQ25
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel        Labels: 3C0-953-549-SW20.lbl
       Part No SW: 3C0 953 549 H    HW: 3C0 953 549 H
       Component: J0527               0015  
       Revision: 00005000    Serial number: 3C9953507R    
       Coding: 0102014
       Shop #: WSC 05311 000 00000
       VCID: 313C1DC7BD2CFE2F927-8064
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 3C0-920-xxx-17.lbl
       Part No SW: 3C0 920 970 R    HW: 3C0 920 970 R
       Component: KOMBIINSTRUMENT VD1 4240  
       Revision: V0033000    Serial number: 00000000000000
       Coding: 0007205
       Shop #: WSC 01119 067 57207
       VCID: 333017CF4730CC3FE0B-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway        Labels: 3C0-907-530-V1.clb
       Part No SW: 3C0 907 530 C    HW: 3C0 907 951 A
       Component: Gateway         007 0040  
       Revision: 00007000    Serial number: 0700C0631304F6
       Coding: 3FFC0C0CD22002
       Shop #: WSC 05311 123 12345
       VCID: 211CED87EDCC4EAF027-8074
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 1C: Position Sensing        Labels: 1Kx-919-xxx-1C.lbl
       Part No SW: 3C0 919 965 A    HW: 3C0 919 965 A
       Component: Kompass         001 0002  
       Revision: 00001000    Serial number: 1339817TQ3XP02
       Shop #: WSC 00000 000 00000
       VCID: 2E0606BBAC12E1D78F5-807A
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 25: Immobilizer        Labels: 3C0-959-433-25.clb
       Part No SW: 3C0 959 433 C    HW: 3C0 959 433 C
       Component:    IMMO         041 0364  
       Revision: 00041000    Serial number: VWZCZ000000000
       Shop #: WSC 64713 001 1048576
       VCID: 2A0E0AAB90FA8DF753D-807E
    
       Subsystem 1 - Part No: 3C0 905 861 H
       Component:    ELV          028 0380
       3C0905861H     ELV          028 0380   
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver        Labels: 1K0-959-701-MIN2.lbl
       Part No: 1K0 959 701 K
       Component: Tuer-SG         024 2801  
       Coding: 0001205
       Shop #: WSC 05311 000 00000
       VCID: 36362EDB5442D917C75-8062
    
    1 Fault Found:
    00932 - Electric Window Motor; Drivers Side (V147) 
                005 - No or Incorrect Basic Setting / Adaptation
    
    -------------------------------------------------------------------------------
    Address 44: Steering Assist        Labels: 1Kx-909-144-G2V2.clb
       Part No: 1K1 909 144 K
       Component: EPS_ZFLS Kl.5   D06 1701  
       Shop #: WSC 00000 000 00000
       VCID: 333017CF4730CC3FE0B-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels: 3C0-959-433-46.clb
       Part No SW: 3C0 959 433 C    HW: 3C0 959 433 C
       Component:    KSG PQ46 RDK 041 0213  
       Revision: 00041000    Serial number: VWZCZ000000000
       Coding: 13900E88D1032E521804141FF00A0F0E083C00
       Shop #: WSC 64713 001 104857
       VCID: 2A0E0AAB90FA8DF753D-807E
    
       Subsystem 1 - Component:   Sounder n.mounted     
    
       Subsystem 2 - Component:       NGS n.mounted     
    
       Subsystem 3 - Component:      IRUE n.mounted     
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass.        Labels: 1K0-959-702-MIN2.lbl
       Part No: 1K0 959 702 K
       Component: Tuer-SG         024 2801  
       Coding: 0001204
       Shop #: WSC 05311 000 00000
       VCID: 372823DF5348201FDC3-FFFE
    
    
    -------------------------------------------------------------------------------
    Address 56: Radio        Labels: 1K0-035-161.lbl
       Part No SW: 1K0 035 161 A    HW: 1K0 035 161 A
       Component: Radio DE2       012 0015  
       Revision: 00012000    Serial number: VWZ4Z7F6117447
       Coding: 0040400
       Shop #: WSC 05311 000 08193
       VCID: 1D64D177D1B46A4F26F-8048
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 62: Door, Rear Left        Labels: 1K0-959-703-GEN2.lbl
       Part No: 3C9 959 703 A
       Component: Tuer-SG         021 2507  
       Coding: 0000144
       Shop #: WSC 05311 000 00000
       VCID: 313C1DC7BD2CFE2F927-8064
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 6D: Trunk Elect.        Labels: None
       Part No SW: 3C9 827 383 B    HW: 3C9 827 383 C
       Component: J605  HECKDECKEL    0405  
       Revision: 00H20001    
       Shop #: WSC 23250 384 715754
       VCID: 303A18C3B626F7279D9-8064
    
       Subsystem 1 - Part No: 3C9 827 384 B
       Component: J756  HECKDECKEL    0405
    
       Subsystem 2 - Serial number: 0600H20001001C0055
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 72: Door, Rear Right        Labels: 1K0-959-704-GEN2.lbl
       Part No: 3C9 959 704 A
       Component: Tuer-SG         021 2507  
       Coding: 0000144
       Shop #: WSC 05311 000 00000
       VCID: 323E12CBB82AC537EBD-8066
    
    No fault code found.
    
    End----------(Elapsed Time: 02:34, VBatt start/end: 13.9V/13.7V)-----------

  2. #2
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    Something just occurred to me as I was watching YouTube videos on tail light bulb replacement for both 2005> Jetta ... and 2006 - 2010 Passat. The Jetta uses standard Incandescent bulbs ... the Passat doesn't use bulbs, they use LED tail lights / turn signals.

    I also found this ...

    VAG Error Code: 16955/001393/0003/2644

    EOBD II Error Code: P0571

    Fault Location:
    Brake Light Switch (F) - Circuit Malfunction/Implausible Signal

    Possible Cause:
    - Malfunction Indicator Lamp (MIL)(K83) active.
    - Glow Plug Indicator Light (K29) active.
    - Brake Light(s) not working.

    - Fuse(s).
    - Wiring/Connector(s).
    - Wrong Brake Light Bulb installed (21W instead of 5/21W).
    - Brake Light Bulb(s) faulty.
    - Brake Light Switch (F) faulty.
    - Misadjusted brake switch.

    (As taken from my Free EOBD II Error Codes software)

    Could this be my problem? ... the Jetta ECU is looking for Jetta tail light bulbs ... instead it sees Passat LED's?

  3. #3
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by Geoffzie View Post
    Could this be my problem? ... the Jetta ECU is looking for Jetta tail light bulbs ... instead it sees Passat LED's?
    I don't think ECUs don't look for tail-light bulbs. That's a BCM/CECM/CCM's job.

    -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.

  4. #4
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    Uwe, the reason I said that was because of this statement (I hadn't posted the entire page from "Free EOBD II Error Codes software") ...

    Description:
    "When the brake pedal is depressed, the brake light switch sends a signal to the Engine Control Module (ECM). When the Engine Control Module (ECM) receives this signal, it cancels the cruise control."

    Also, in the Jetta wiring diagrams, there are two wires from the ECU that are connected to the Brake Peddle Switch (F47) ... T121/55 (White/Green) and T121/56 (Black/Red). The 2007 Passat only has the Black/Red wire connected to the Brake Light Switch ... I had to add the White/Green wire from the Jetta ECU to the Brake Peddle Switch F47.

    Apparently, the ECU connections are required for the cruise control ... which makes sense. My brake lights continue to work fine even after the Brake fault is set ... the cruise control does not.

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  6. #5
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    there are jettas with led brake lights, so you'll have to look elsewhere for fault
    in jettas brake sensor is on the brake pedal while in passat it's incorporated in abs if my memory serves me right, so did you try to check brake sensor? this sensor can cause cruise not to work

  7. #6
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    m87a, I'm specifically referring to the year Jetta that the ECU is from ... a 2008 2.5L. And I don't believe that year had LED brake lights (at least not in the US).

    The Jetta, through late 2005, uses a mechanical brake light switch (4-terminal) mounted under the dash on the brake peddle (like older VW's) just as you said. But later Jetta's (2006 on) and the B6 Passat used a hall-effect brake light switch (3-terminal) mounted under the hood on the master cylinder. The B6 Passat also uses a 4-terminal vacuum booster switch that has all 4 wires connected directly to the ABS Control Module ... that's probably what you're referring to.

    The Jetta ABS pump and the Jetta ECU have no provisions for the vacuum booster switch, and there's actually a place to disable it in Address 03: ABS Brakes ... so I have it disabled.

    Because the Jetta ABS pump and ECU require a 4-wire brake light switch (one side is N/O contacts "F" ... the other side is N/C contacts "F47") ... and the Passat hall-effect switch is only 3-wire ... I had to install a Jetta Peddle-mounted switch under the dash.

    Although you could be right, I may have to look elsewhere for the fault ... I'm just examining EVERYTHING. When I started this project, I figured that it would be relatively simple ... because I "assumed" that the Jetta and Passat were much the same ... WRONG!

  8. #7
    Verified VCDS User Keithuk's Avatar
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    Quote Originally Posted by Geoffzie View Post
    Uwe, the reason I said that was because of this statement (I hadn't posted the entire page from "Free EOBD II Error Codes software") ...

    Description:
    "When the brake pedal is depressed, the brake light switch sends a signal to the Engine Control Module (ECM). When the Engine Control Module (ECM) receives this signal, it cancels the cruise control."

    Also, in the Jetta wiring diagrams, there are two wires from the ECU that are connected to the Brake Peddle Switch (F47) ... T121/55 (White/Green) and T121/56 (Black/Red). The 2007 Passat only has the Black/Red wire connected to the Brake Light Switch ... I had to add the White/Green wire from the Jetta ECU to the Brake Peddle Switch F47.

    Apparently, the ECU connections are required for the cruise control ... which makes sense. My brake lights continue to work fine even after the Brake fault is set ... the cruise control does not.
    Free EOBD II Error Codes software is my software. The Free one is only on http://www.myturbodiesel.com/threads...software.2202/

    The other forums don't show Free, just Google EOBD II Error Codes software the new version has been renamed VAG Fault Codes as it only covers VAG vehicles.

    That's the older version with 10,266 error codes. There was a lot of EOBD generic codes with no solution. If you search Possible Cause for Unknown Symptom there are 1,629 codes. These have been removed from the new version. There are 132 new codes with no solution in the new version.
    Last edited by Keithuk; 07-09-2017 at 08:32 AM.
    New User Keith

    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Flat Tyre Indicator, Basic Protection Pack + VCDS.

  9. #8
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    i don't know about US but in europe there are led brake lights, also these leds use a lot of resistor so they draw enough power to keep cecm happy, so no error bulb out, yep that's what i was referring to, mechanical brake switch...
    you really did open a can of worms with this one... in my opinion look elsewhere for fault

  10. #9
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    m87a I am.

    Today I'm going to recheck the brake light switch wiring (for the umteenth time!). I couldn't get the brake lights to go OFF initially, after the engine conversion ... even with the master cylinder brake light switch ... unplugged! Any time the ignition was on, the brake lights were on!

    After trying the post-2005 Jetta brake light wiring (didn't work) ... I ended up using a 2002 VW Beetle wiring diagram (that may be where the problem is) ... and the brake lights worked properly! But that was before I connected the ECU wires T121/55 and T121/56.

    Today, I'm going to try to connect it properly and see what happens.

  11. #10
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    I think I got it fixed!

    OK, I think I've got it fixed! I rewired the brake light switch, cleared the codes, and drove the car for about 1/2 hour ... the brake fault didn't return!

    I cut the 4 wires to the brake light switch under the dash ... then I temporarily connected them based upon the Jetta wiring diagrams in Bentley. I tried the diagrams for 2006, 2007, and 2008 Jetta's ... no dice. What finally worked was using the diagram for Jettas manufactured from May 2005 (not sure why it worked since the Jetta ECU is 2008, and the Passat is 2007).

    What's interesting is ... if you pull the brake light fuse ... the brake lights turn ON! ... that's why my brake lights were on ... no power! On the newer VW's, the tail lights, turn signals, brake lights, and head lights aren't wired from the lights ... to the switches ... to the fuses like they used to be. ALL the lights are wired directly to the J519 Vehicle Electrical System Control Module FIRST, and it controls all their functions through the switches (Head lights, tail lights, turn signals, brake lights, DRL, etc.).

    You guys probably already knew that ... but it was news to me!

    Thanks for your help on this ... now I've just got to figure out the ABS, and how to get the EPB to work

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