warning lights/partial brake light failure HELP!!

[jbcalvin]

HI guys,

Just back from holiday and I have the following issue. ESP and Coil warning lights are on on the dashboard. Both rear light unit brake lights are NOT working (bulbs and wiring checked), however the upper brake light (I have an avant) IS working.

Brake pedal switch has been replaced and no change, IanFM has scanned the car and is getting multiple codes regarding ABS. Hopefully he will see this and post the codes which have been saved.

I'm hoping it's NOT the ABS control unit, anyone shed any light on this, MOT will be due next month….

Steve

 

[Jimmy TDI]

The abs control units are prone to loosing their coding on these if you do any work on the electrics, also you have to be very careful that you fit the brake switch correctly as they're easily broken.

I've just had to recode a members abs module as it lost it's coding when he fitted cruise control. You need the full version of VCDS to do it, but it's easy enough to do.

 

[Jimmy TDI]

Actually it might just have gone into system function test mode.

Have a watch of THIS VIDEO as it might be all you need to do.

 

[quattrojames]

This isn't over helpful, but I have heard of this before on here. There was a thread, I'll have a search.

 

[quattrojames]

Found a few threads, incorrectly fitted brake pedal switch seems to be the consensus...

http://www.audi-sport.net/vb/a4-a4-...7049-help-please-asn-brake-light-trouble.html

 

[jbcalvin]

Thanks guys, will try both of these hopefully tonight.......

 

[IanFM]

Right guys quick update.

Just had it on VCDS and got the following codes:

Address 01: Engine Labels: 038-906-019-AJM.LBL
Controller: 038 906 019 JT
Component: 1,9l R4 EDC G000SG 1572
Coding: 00003
Shop #: WSC 63351
VCID: 7297E62B2DA1
WAUZZZ8E63A110919 AUZ6Z0B0141797
3 Faults Found:
17994 - Engine Mount Solenoid Valves (N144/N145): Short to Plus
P1586 - 35-10 - - - Intermittent
16955 - Brake Switch (F): Implausible Signal
P0571 - 35-10 - - - Intermittent
18057 - Powertrain Data Bus: Missing Message from ABS Controller
P1649 - 35-10 - - - Intermittent
Readiness: N/A

Address 03: ABS Brakes Labels: 8E0-614-517.LBL
Controller: 8E0 614 517 A
Component: ABS/ESP allrad 1726
Coding: 04255
Shop #: WSC 02327
VCID: 263FCA7BD1E9
2 Faults Found:
00526 - Brake Light Switch-F
36-00 - Open Circuit
65535 - Internal Control Module Memory Error
00-00 - -

Address 09: Cent. Elect. Labels: 8E0-907-279-8E2.LBL
Controller: 8E0 907 279 C
Component: int. Lastmodul RDW 0203
Coding: 00001
Shop #: WSC 63351
VCID: 3217262BED21
1 Fault Found:
01312 - Powertrain Data Bus
79-10 - Please Check Fault Codes - Intermittent

Address 17: Instruments Labels: 8E0-920-9xx-8E2.LBL
Controller: 8E0 920 950 J
Component: KOMBI+WEGFAHRS. RB4 D35
Coding: 01401
Shop #: WSC 02327
VCID: 30132C23E32D
WAUZZZ8E63A110919 AUZ6Z0B0141797
2 Faults Found:
01316 - ABS Control Module
49-10 - No Communications - Intermittent

Brake light switch has been replaced and tested prior to this scan and highlevel brake light works and VCDS shows Brake switch active when pedal pressed.

Anyone got any suggestions (preferably not the ABS module)?

If it is the ABS module can these be swapped out as 2 cars nearby braking?

 

[quattrojames]

Can you clear all those, take it for a drive and then rescan?

 

[IanFM]

They come back as soon as you clear them!

Car is being driven daily for the last week after I cleared them last weekend.

 

[jbcalvin]

anyone shed any light on this before I just go and buy a new ABS control module?

 

[quattrojames]

Can you two swap brake pedal switches? Just to eliminate that before big expense, as it's still showing the error code.

 

[IanFM]

I've already done that last weekend. In total the car has had 3 different brake pedal switches installed one of which was and still is working in my car. In the appropriate measurement block in vcds it shows '0' when the brake pedal is released and 'activated' when the pedal is pressed.

 

[jbcalvin]

Any VCDS guru's out there, MOT due soon and need to get this fixed ASAP…..

 

[Jimmy TDI]

Did you check the module to see if it had 'forgot' it's coding like I suggested?

Have a watch of THIS video if you didn't, as it may be all you need to do rather than replace it. After recoding it (if this is the problem) you will then have to do the function test that I linked to earlier.

If you do have to fit a new module it will have to be coded to your car anyway as they won't work without learning to your cars VIN


HTH Jim

 

[jbcalvin]

Hi Jimmy,

Already looked at that video and I doubt it has lost it's coding, I also do not have a full version of VCDS anyway. The control unit is talking to the car and VCDS lite, plus I am not getting the fault code described for a non-coded unit.

In light of this, it looks like I will be ordering a new control unit unless anyone else can suggest something......

 

[jbcalvin]

Ordering a new ABS control unit and then booking it in to my local indy to get it fitted/coded.......

 

[jbcalvin]

UPDATE!!

Turns out it was the ABS control unit, got one cheap out of a breakers yard, had it fitted and coded and it instantly flagged up a fault with the N/S/F ABS sensor….

All changed and now working fine again…..

Happy days….