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Electronic Parking Brake Failure... Switch, EPB Module or Passenger Rear Motor/sensor

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Electronic Parking Brake Failure... Switch, EPB Module or Passenger Rear Motor/sensor

 
  #1  
Old 08-27-2017, 03:18 PM
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Electronic Parking Brake Failure... Switch, EPB Module or Passenger Rear Motor/sensor

Hey folks,

My parking brake failed on in my driveway, so was completely immobilized.

Tried the VCDS procedures to no avail, as well as battery disconnect.

Was only able to get going after removing the wheels and parking brake motors, then manually turning them to release. Not fun on a slanted driveway. Also, my car wouldn't enter jack mode, so hope that's OK.

After I got the brakes released, I am able to drive the car, however the p with a slash through it remains and as soon as I get moving there's a piercing warning tone, which makes driving the car unpleasant. Once stopped (in park or drive) the tone stops.

The parking brake switch was and still is completely unresponsive and I have the p/, brake light in tachometer and lit up parking brake switch.

Ran VCDS again and here's what I got.

Here's the specific fault... Address 53: Parking Brake

1 Fault Found:
02435 - Supply Voltage for Control Module for Right Channel
009 - Open or Short to Ground - MIL ON

Before I go crazy trying to figure this out. Is this the common 2006 right rear sensor, switch or the control module? Any help appreciated from the experts.

Other info:

Parking brake motor housings don't appear to have any cracks.

Haven't tried disconnecting the cables after the manual release, but I don't think that would make a difference as it was still unresponsive.

VCDS 006 and 007 'basic functions' have no effect on the parking brake motors.

Output tests seem to work OK, turning the various lamps/warnings/ on and off, etc, but the motors don't move.




full scan results are below.






Chassis Type: 3W (3W - Bentley Continental (2004 > 2007))
Scan: 01 02 03 05 06 07 08 09 11 13 15 16 17 18 19 23 26 28 34 36
37 38 46 47 53 54 57 65 66 68 69 6C 71 75 76 77

VIN: SCBCR63W96C036544 Mileage: 65490km-40693miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 07C-906-018-BEB1.clb
Part No SW: 07C 906 018 DF HW:
Component: BY-6.0L-TT G ™7948
Revision: 95ˇTT Serial number: 000-00012.07.
Coding: 0000173
Shop #: WSC 01666 772 36780
VCID: 6CD7D83F4C3B012646-5140

No fault code found.
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 09E-927-156.lbl
Part No SW: 09E 927 760 G HW: GS1 9.0 4.1
Component: AG6 09E 6.0L W12TT 1905
Coding: 0000101
Shop #: WSC 00083 000 00000
VCID: 3467005F548B99E65E-5140

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 3W0-614-517-V1.lbl
Part No: 3W0 614 517 D
Component: ESP 5.7 4WD H01 0021
Coding: 0007878
Shop #: WSC 03242 000 00000
VCID: 36633A5742F78BF660-5140

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. Labels: 3D0-909-13x-05.lbl
Part No SW: 3D0 909 137 C HW: 5WK 484 97
Component: 43 Kessy 6700
Revision: 67005715 Serial number: VWZ3Z0E7420008
Coding: 0405741
Shop #: WSC 00083 000 00000
VCID: 275DE713955DE27EEB-5140

Subsystem 1 - Part No: XXXXXXXXXXX
Component: ELV XXXX

No fault code found.

-------------------------------------------------------------------------------
Address 06: Seat Mem. Pass Labels: None
Part No: 3W0 959 759 A
Component: CM Seat Pass. 0009
Coding: 0000001
Shop #: WSC 03113 103 60957
VCID: 479D4793351D027E0B-5140

No fault code found.

-------------------------------------------------------------------------------
Address 07: Control Head Labels: 3D0-035-00x-07.lbl
Part No: 3W0 035 008 F
Component: ZAB COCKPIT 0251
Coding: 0400325
Shop #: WSC 00083 000 00000
VCID: 306F0C4FA093A5C63A-5124

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: None
Part No: 3W0 907 040 E
Component: Climatronic BY614 2010
Coding: 0000102
Shop #: WSC 00000 000 00000
VCID: 3365034351859EDE47-5140

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 3D0-937-049-V1.clb
Part No: 3D0 937 049 H
Component: STG.Bordnetz 5101
Coding: 0000107
Shop #: WSC 00083 000 00000
VCID: 2F6D0F33BDADBA3E23-5140

No fault code found.

-------------------------------------------------------------------------------
Address 11: Engine II Labels: 07C-906-018-BEB2.clb
Part No SW: 07C 906 018 DF HW:
Component: BY-6.0L-TT G ™7948
Revision: 80ˇTT Serial number: 000-00012.07.
Coding: 0000173
Shop #: WSC 01666 772 36780
VCID: 6CD7D83F4C3B012646-5140

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 3D0-909-601.lbl
Part No: 3D0 909 601 E
Component: 0P Airbag 8.4E+ H10 0936
Coding: 0012368
Shop #: WSC 00083 000 00000
VCID: 2541ED1BEF51F06ED9-5140

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 3D0-953-549.lbl
Part No: 3D0 953 549 D
Component: Lenksšulenmodul 3401
Coding: 0000012
Shop #: WSC 00083 000 00000
VCID: 2E531237BAA7B33628-5140

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 3Wx-920-xxx-17.lbl
Part No: 3W8 920 840 C
Component: KOMBIINSTRUMENT RB8 0610
Coding: 0023203
Shop #: WSC 00083 000 00000
VCID: 3C77287F7CDB51A696-5140

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels: 6N0-909-901-19.lbl
Part No: 6N0 909 901
Component: Gateway K<>CAN 0101
Coding: 0000006
Shop #: WSC 03113 103 60957
VCID: 70EFCC4F6013E5C67A-5140

No fault code found.

-------------------------------------------------------------------------------
Address 34: Level Control Labels: 3Wx-907-553-34.clb
Part No: 3W0 907 553 A
Component: LUFTFDR.-CDC- 3C3V0 7203
Coding: 0005561
Shop #: WSC 00083 000 00000
VCID: 387F346F48E37D8672-5140

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No: 3W0 959 760 A
Component: CM Seat Driver 0008
Coding: 0000001
Shop #: WSC 03113 103 65158
VCID: 3F8D5F736DCD4ABEB3-5140

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation Labels: None
Part No: 3W0 919 887 A
Component: NAVIGATION 0185
Coding: 0400000
Shop #: WSC 00083 000 00000
VCID: 45814D9B0F11106EF9-5140

No fault code found.

-------------------------------------------------------------------------------
Address 38: Roof Electronics Labels: None
Part No: 3W0 907 135 E
Component: Dachmodul 0707
Coding: 0002493
Shop #: WSC 00083 000 00000
VCID: 387F346F48E37D8672-5140

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 3D0-959-933.lbl
Part No: 3D0 959 933 F
Component: 52 HSG 0101
Coding: 0000040
Shop #: WSC 00083 000 00000
VCID: 3365034351859EDE47-4B1A

Subsystem 1 - Part No: 3W8 959 701 B
Component: Tuersteuergeraet FS 1002

Subsystem 2 - Part No: 3W8 959 702 B
Component: Tuersteuergeraet BF 1002

Subsystem 3 - Part No: 3W8 959 703 A
Component: Tuersteuergeraet HL 1002

Subsystem 4 - Part No: 3W8 959 704 A
Component: Tuersteuergeraet HR 1002

Subsystem 5 - Part No: 3W0 909 610 E
Component: SX HDSG 1707

Subsystem 6 - Part No: 7L0 907 719 A
Component: Neigungssensor 0020

No fault code found.

-------------------------------------------------------------------------------
Address 47: Sound System Labels: 7Lx-035-4xx-47.lbl
Part No: 3W0 035 456 D
Component: 12K-AUDIOVERST 4123
Shop #: WSC 00000 000 00000
VCID: 35613D5B5FF180EE69-5140

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake Labels: 3W0-907-801.clb
Part No SW: 3W0 907 801 D HW: 3W0 907 801 D
Component: EPB BC6HX24 HC6 X240
Coding: 0022401
Shop #: WSC 03113 103 65158
VCID: 377D375345FD72FE7B-5140

1 Fault Found:
02435 - Supply Voltage for Control Module for Right Channel
009 - Open or Short to Ground - MIL ON

-------------------------------------------------------------------------------
Address 54: Rear Spoiler Labels: 1C0-959-733.lbl
Part No: 1C0 959 733 H
Component: Heckspoiler 0002
VCID: 306F0C4FF093A5C63A-51F2

No fault code found.

-------------------------------------------------------------------------------
Address 65: Tire Pressure Labels: None
Part No: 3W7 907 273
Component: Reifendruckueberw. 0003
Coding: 0480311
Shop #: WSC 00083 000 00000
VCID: 7DF1E57B274198AEE1-5140

No fault code found.

-------------------------------------------------------------------------------
Address 68: Wiper Electr. Labels: 3Wx-955-023.clb
Part No: 3W1 955 023 C
Component: Wischermodul ™9323
Shop #: WSC 00000 725 65552
VCID: 36633A5742F78BF660-5140

No fault code found.

-------------------------------------------------------------------------------
Address 71: Battery Charger Labels: 3D0-915-181.lbl
Part No: 3D0 915 181 D
Component: Batteriemanagement 2800
Shop #: WSC 00000 000 00000
VCID: 2447F01FE46B0966CE-5140

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist Labels: Redir Fail!
Part No: 3W0 919 283 A
Component: 02 Einparkhilfe 0303
Shop #: WSC 00000 000 00000
VCID: 3B752B6379D5569E9F-5140

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone Labels: None
Part No SW: 3W0 035 385 A HW: BL5 503
Component: rSAP ECU 0030
Coding: 0000272
Shop #: WSC 00000 000 00000
VCID: 3365034351859EDE47-5140

No fault code found.

End-------------------------(Elapsed Time: 09:02)--------------------------
 
  #2  
Old 08-27-2017, 08:22 PM
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As an update, tried the battery disconnect again and this didn't work either.

Curious as to other folk's experiences as I've not yet to read about the epb switch having no response whatsoever.

btw, the battery disconnect (both batteries) was an adventure. not thinking I thought I would leave it disconnected overnight and then shut the trunk. 10 seconds later I realized my mistake. Tried the front receptacle per the video and was no go. (i think because of the cables being disconnected there was an incomplete circuit)

Then tried the seat removal. Seat removal was surprisingly easy. However, the cable lever pushed all the way to the right did nothing.

ended up opening the access door between the seats and was able to use a broom stick to coax the negative connection on the driver side to just touch the terminal. voila. Of the three things, that was surprisingly the easiest, lol. Will have to check into that release cable to see what the heck is up. seems to be frayed just below the right angle attachment that goes into the lever, so may be stretched or something.

At least my problems are down to the p/ thing, which I hope some members will be able to confirm as one (I also hope!) of the 4 items. (left and right motors, switch and module)

Afraid to drive it as I've read some horror stories about the brakes activating while moving. (particularly since I manually opened the motors) Thinking my best bet is to either remove the motors completely or perhaps pull the fuses so I can take it to the dealer (1 hour away), but the warning tone is so horrible I don't want to drive the car more than 5 minutes.
 

Last edited by sam08861; 08-27-2017 at 08:27 PM.
  #3  
Old 08-28-2017, 07:16 PM
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another update..

All right, I checked the front fuses (#27, #69) and these are OK. Rear fuses check out also. Disconnected my fuse taps and bring back to full stock, but no difference whatsoever.

It seems when I try and clear the codes, they pop right back up, so it seems the module isn't accepting them or just sends them back immediately.

One other funky thing is happening.. The rear spoiler decided to go up all by itself and the motor kept turning past the top position, making a nice loud grinding noise.

Running the VAG again, I got the same error as above, but now both left and right side.

(02434 in addition to the 02435)

Checked the connections for the motors and these looked fine also. No rust or other visible evidence of water intrusion.

Decided to remove the center console and check the switch wiring for chafing and all looked fine.


Did find a few curious items, however.

1. There is what looks like a lose end (blue arrow pointing to it) from some sort of cable. Anyone know where this is supposed to go?

2. A black plastic piece was also found.

Pics below..

Have no Idea what the heck these things are.

The cable thing worries me a bit though, but assuming it related to the parking lever and in park is in the most forward position.

With the wonky behaviour of the rear wing, I'm wondering if perhaps I might have a low battery or some other wiring/water intrusion problem.




weird plastic piece



cable end 1



cable end 2
 
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Old 08-29-2017, 10:36 AM
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Ok, looks like I'm talking to myself, lol.

Gussing that my situation is unique and the best bet here is to take the motors off or pull fuses 29 and 30 in the rear, put in earplugs and take it to the dealer!

That's going to be a rough ride!
 
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Old 08-29-2017, 05:17 PM
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think I found my problem and why it's so wonky. found standing water in the spare tire well up to the top of the foam blocks holding the tools/jack in place.

Will start a new thread to look for help her.
 
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Old 09-07-2017, 11:22 AM
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I realize I'm conversing with myself here, but posting an update in case it helps anyone down the line..

After drying out the water, I found that the rear spoiler was an independent issue due to the cable guides not staying together. (cheap plastic compression fitting, fixed by welding the tubes together with expoxy)

Then I got code only code 02443, suggesting bad epb switch or wiring to. Replaced the switch and voila.

http://wiki.ross-tech.com/wiki/index.php/02443

(part #3W0927225C, $250 at the local dealer for a new one, old switch had the same #, parts guy said they sell a ton of these and keep these in stock at all times since they
get customers coming in all the time asking for these are selling about 20 a month. Btw, the pricing info and order taking for the 2019 Continental will be available next week, with expected delivery next fall, for those interested.)

Now I'll need to do the complete adaptation since I tinkered with the motors, but I'm really glad to have those warning lights go away and get my center lcd info panel back along with the parking brakes since I'm often parking in sloped areas.

Examining the old parking brake switch after removal, seems there's a flimsy metal plate that is needed to actuate the buttons on a circuit board inside that gets bent and doesn't press hard enough on the buttons. I'll fix this by bending the metal to make better contact and have a spare ready in case this fails again.
 

Last edited by sam08861; 09-07-2017 at 11:28 AM.
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Old 09-08-2017, 08:51 AM
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Hi Sam.

Glad you got it fixed.
Was it the actual switch in the centre console that you are referring to?
I rarely use mine so maybe I'm lucky.

Les.
 
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Old 09-08-2017, 09:28 AM
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Hi Les,

That's right. The switch opposite the mirror control that is used to set and release the parking brakes.

If it stops responding, I found that you can listen for a very faint click when pushing in or pulling out at the halfway point in the range of motion. It appears there's a metal lever inside which no longer presses firmly enough on the circuit board contacts.

See photos below showing the switch, inside top, inside bottom (w/circuit board) and the removed rocker with metal prongs that actuate the circuit board switches.

I removed the rocker, bent the tabs and it's now working. Will keep this as a ready spare in the car just in case.
 
Attached Thumbnails Click image for larger version

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Name:	INSIDE SWITCH.jpg
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Name:	INSIDE TOP.jpg
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Name:	ROCKER.jpg
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ID:	512234  
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Old 09-08-2017, 12:37 PM
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Thank you for posting your findings. The pictures are invaluable. Everyone will benefit from your insights.
 
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Old 09-09-2017, 02:23 AM
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Brilliant. Looks like a very easy fix.

Thanks.

Les.
 
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Old 09-09-2017, 02:52 PM
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Thanks also good info to know. you also know right, that the switch also activates emergency braking. If you pull that switch up whilst driving the braking system ( all of it) is operated at 100% braking force on all wheels and will bring the car to a dead stop. Its incase the brake peddle and associated system fails. Good to know for the mrs' incase you take not well and pass out at the wheel. Pull that switch when driving and hang on for grim life.
 
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Old 09-09-2017, 06:27 PM
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Originally Posted by Sunnyside View Post
Thanks also good info to know. you also know right, that the switch also activates emergency braking. If you pull that switch up whilst driving the braking system ( all of it) is operated at 100% braking force on all wheels and will bring the car to a dead stop. Its incase the brake peddle and associated system fails. Good to know for the mrs' incase you take not well and pass out at the wheel. Pull that switch when driving and hang on for grim life.
Thank you for the additional info about use of the switch for emergency stopping if peddle failure occurs. Now, if I can remember to use if needed.
Ron
 
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Old 09-09-2017, 06:29 PM
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Originally Posted by sam08861 View Post
Hi Les,

That's right. The switch opposite the mirror control that is used to set and release the parking brakes.

If it stops responding, I found that you can listen for a very faint click when pushing in or pulling out at the halfway point in the range of motion. It appears there's a metal lever inside which no longer presses firmly enough on the circuit board contacts.

See photos below showing the switch, inside top, inside bottom (w/circuit board) and the removed rocker with metal prongs that actuate the circuit board switches.

I removed the rocker, bent the tabs and it's now working. Will keep this as a ready spare in the car just in case.
Great pictures. I would not thought to remove the switch and inspect the metal fingers for proper pressure on the buttons.

Ron
 
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Old 09-09-2017, 10:08 PM
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I have one more important thing to add that I just figured out. Someone looking at the thread in the future will look at this and laugh.

It appears the unknown item in picture #1 in post #3 actually goes into the open slot in picture #3 in post #8. Putting a similarly sized plastic piece into the slot and the switch has much more leverage. (would have put the original plastic piece in but I have no idea what I did with it, so I cut 3/4" off the end of a plastic paintbrush and put the rounded end facing down into the rocker. This stuck out about 1/4 and pushed in/out with the spring easily and also gave a more positive up and down switch engagement feel)

Here's what I think happened and it's a one in a million event. When I removed the the veneered panel below the shifter, the bottom portion of the switch must have caught on something and the piece in post #3 fell out before the bottom snapped back into place. This would have been aided by the spring in the receptacle, causing the plasctic piece to shoot out.

This piece is exactly the right shape and there is a spring where the protrusion goes into and the smooth rounded end would perfectly fit into the white end of the rocker to give additional leverage. Using round smooth (not brush side) end of a small plastic paintbrush as a substitute, I found the extra length moves the 2 spring loaded black plastic hooks out of the way so there is more range of motion. With the added range of motion, there's no need to bend the metal tabs.

The chances of this happening are very low, but looking at the parts the bottom comes of very easily, if the thin top plastic is pushed out.

Murphy's law being what it is, I didn't piece this together until just now. I could not fathom a 3/4" long piece of plastic escaping from what appears to be a sealed switch unit.

This can't possibly explain the 20 switches that fail a month per the parts guy, but it is what I believe happened in this particular case.

Someone at a breaker or having a bad switch laying around can verify by looking at the parts inside. Have to remind myself, there should be no 'extra parts,' lol.

Thanks for reading and happy motoring!

Sam
 

Last edited by sam08861; 09-09-2017 at 10:21 PM.
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Old 09-09-2017, 11:31 PM
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Thumbs up

Originally Posted by sam08861 View Post
I have one more important thing to add that I just figured out. Someone looking at the thread in the future will look at this and laugh.

It appears the unknown item in picture #1 in post #3 actually goes into the open slot in picture #3 in post #8. Putting a similarly sized plastic piece into the slot and the switch has much more leverage. (would have put the original plastic piece in but I have no idea what I did with it, so I cut 3/4" off the end of a plastic paintbrush and put the rounded end facing down into the rocker. This stuck out about 1/4 and pushed in/out with the spring easily and also gave a more positive up and down switch engagement feel)

Here's what I think happened and it's a one in a million event. When I removed the the veneered panel below the shifter, the bottom portion of the switch must have caught on something and the piece in post #3 fell out before the bottom snapped back into place. This would have been aided by the spring in the receptacle, causing the plasctic piece to shoot out.

This piece is exactly the right shape and there is a spring where the protrusion goes into and the smooth rounded end would perfectly fit into the white end of the rocker to give additional leverage. Using round smooth (not brush side) end of a small plastic paintbrush as a substitute, I found the extra length moves the 2 spring loaded black plastic hooks out of the way so there is more range of motion. With the added range of motion, there's no need to bend the metal tabs.

The chances of this happening are very low, but looking at the parts the bottom comes of very easily, if the thin top plastic is pushed out.

Murphy's law being what it is, I didn't piece this together until just now. I could not fathom a 3/4" long piece of plastic escaping from what appears to be a sealed switch unit.

This can't possibly explain the 20 switches that fail a month per the parts guy, but it is what I believe happened in this particular case.

Someone at a breaker or having a bad switch laying around can verify by looking at the parts inside. Have to remind myself, there should be no 'extra parts,' lol.

Thanks for reading and happy motoring!

Sam
Reads like MacGyver modified the switch to work. A true DIY type guy.
Thanks for the additional FYI.
Ron
 

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