Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
EPB auto release and other issues
Hello all. Can anyone help me with the following issues on my 2008 disco. I have spent a lot of time reading similar messages and looking at the wiring diagrams.
It started with an epb auto release not working message. My IID said lost messages so I suspected a wiring harness issue at the rear left wheel arch I unplugged the plugs and they look good. I checked the wiring around plugs with a meter and again they were good and voltages as expected. I took the spare wheel out and stripped the wiring back as far as I could. I didn't find any splicing our issues. More errors are now on the IID (rear left and right height sensors and transfer case error U0403). Special programs are now off even with everything plugged in. I have checked all fuses and all good. I also have the battery back on charge. Any tips much appreciated.
Thanks
Rich
4th Jul 2019 8:47 am
Leo Disco
Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
Further info. The epb does work but wont auto release. I have re-calabrated the xy sensor but the error comes straight back.
4th Jul 2019 9:22 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1780
Probably need to list all codes so that members can make an informed decision
4th Jul 2019 9:25 am
Leo Disco
Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
The new codes that came up yesterday related to transfer box and rear height sensors were U0403-68(2B) and C1A70-1C(2E)
4th Jul 2019 10:05 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1780
Should have made myself clear, list all codes, not just new ones
4th Jul 2019 10:19 am
Leo Disco
Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
Here are the two current issue from park brake and special programs off. I am thinking it could be the supply to the modules but the fuses and links are ok
4th Jul 2019 6:06 pm
Leo Disco
Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
Checked the wheel arch connector to clutch pedal switch all 3 wires good. And also the 4 wires to the hand brake switch all good. Removed front wheel arch and found nothing there (2008), power connector is behind headlight. 12v on both sides of connector.
I have checked most of the items that forum members have previously had issues with. The only thing I can think of next is removing the plug from the park brake unit and checking from the wheel arch connector to there (with multimeter).
4th Jul 2019 9:28 pm
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1780
This may help.
P0641 Description: The control module has 2 internal 5-volt reference buses called "5-volt reference 1" and"5-volt reference 2". Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.
I would be looking at the module behind the battery box for bad or dodgy connections or, as you had EPB problems, the switch behind the brake lever.
4th Jul 2019 11:56 pm
Leo Disco
Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
Thanks is there a good link for the module behind the battery box ? I have multi metered the cables to the hand brake switch and all 4 are good.
5th Jul 2019 7:00 am
Leo Disco
Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
Ok so found the plug on the transfer box under the car loose and that solved the transfer box issues. I now only have one fault to solve shown below. Suggestions appreciated
5th Jul 2019 6:01 pm
Leo Disco
Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
Just the top one
5th Jul 2019 6:01 pm
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1780
"U" codes are just information codes and can be reset
6th Jul 2019 3:04 am
Leo Disco
Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
Yer but I throws up the yellow "park brake auto release not functioning" light. When I reset the xy sensor and the fault it just comes straight back
6th Jul 2019 7:45 am
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8069
Have you done a hard reset? what about the brake light switch?- the signal comes from the switch to auto release.It can when others can't,
It will when others won't,
It goes where others don't.
6th Jul 2019 8:08 am
Leo Disco
Member Since: 22 Dec 2013
Location: Newcastle
Posts: 210
Well not much luck today spent all day looking for wiring issues and found none. Checked the supplies etc at the epb module and all good. Installed a new brake pedal sensor and all new discs pads and park brake shoes. Still have the same error.
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