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 ª7948 Revision: 95ÿTT 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 ª7948 Revision: 80ÿTT 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: Lenksäulenmodul 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 ª9323 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)-------------------------- |
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. |
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. https://cimg1.ibsrv.net/gimg/www.6sp...1fda87305a.jpg weird plastic piece https://cimg2.ibsrv.net/gimg/www.6sp...c3292b0309.jpg cable end 1 https://cimg3.ibsrv.net/gimg/www.6sp...34735b61ea.jpg cable end 2 |
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! |
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. |
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. |
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. |
4 Attachment(s)
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. |
Thank you for posting your findings. The pictures are invaluable. Everyone will benefit from your insights.
|
Brilliant. Looks like a very easy fix.
Thanks. Les. |
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.
|
Originally Posted by Sunnyside
(Post 4663658)
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.
Ron |
Originally Posted by sam08861
(Post 4663447)
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. Ron |
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 |
Originally Posted by sam08861
(Post 4663698)
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 Thanks for the additional FYI. Ron |
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