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we had brake light switch fault 00526 quick check with multi meter , so satisfied it was faulty ordered new one its a superseded part , fitted new part fault still on the system , checked with multi meter and the switch is working correctly this lead to further investigation , this is a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
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we had brake light switch fault 00526 quick check with multi meter , so satisfied it was faulty ordered new one its a superseded part , fitted new part fault still on the system , checked with multi meter and the switch is working correctly this lead to further investigation , this is a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: Lenksáulenmodul 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: Komfortgerát T3B 1512
Coding: 06859
Shop #: WSC
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