L322 l322 have to reset tc, abs and brake pad light every start 0x0005a

I recently got a 2006 l322 (last of the td6) l322's in and it has a really random fault i havent come across before.

Every time I start the car i have to turn the steering wheel all the way to the left and right to reset the tc abs and pad warning light. If i turn the car off and i wait any longer than 5 seconds to restart it i have to do this.

The only fault i have is in the vehicle dynamics module which is 0x0005a Temporary system deactivation. I have no faults in the steering angle sensor and apart from this everything else is fine. It is 100 percent not a battery drain issue.

Im wondering if anyone else has seen this before.

Not heard of that , the 2006 is a funny one as you have a mix of JLR and BMW electrics. You usually have to do that if you have disconnected the battery as I’m sure you know .
Is that module the ABS module that is fitted under the bonnet as they can go bad or suffer with corroded connectors i believe and something like Faultmate can dig deeper into that so I’ll have a read up in the help section of mine to if it points anywhere?

What diagnostic kit are you using ?

Everything else in the car is functioning correctly , you have used HDC and EAS without fault and you have no fault codes for any other system or communication bus and all fuses are good ?

Hi everything else is good with no other fault codes. Im using autel maxidas which is pretty good. If i cant get to the bottom of it i can get hold of autologic.

If i reset the system (tuning steering wheel left to right etc) eas and hdc function perfectly

If the HDC all works correctly then i would be looking at the fuses that supply the ABS module as i think that is the vehicle dynamics module.
Do you have one of these by the battery / suspension turret ? https://blackbox-solutions.com/help/SM045.html

If you do then i would be checking the connections to that and also the fuses on the attachments taken from Rave electronics library.

It seems like you are losing a permanent live somewhere which is why it thinks you have disconnected the battery every time you turn off the ignition, that is just a guess though.
i would be checking the hill descent switch for issues as mine had a drink spilt over it in its past which stopped mine working and i would also be checking all fuses and connections to things like wheel speed sensors.

Cheers for the diagram. My hdc and low range switch works fine. I will check the contacts on the abs plug tomorrow. I have now lost air suspension with fault codes showing loss of communication with the vehicle dynamics module and steering angle sensor. u0122-87 and u0126-87.

I will also remove the glovebox and check for water ingress into the air suspension ecu.

Did you have a look at the link above to blackbox solutions - is that the unit you have ?
if so, all the systems you are having an issue with i linked to this so will be a good place to look but as i have found out there are so many different ECUs talking to each other over the various buses a seemingly unrelated fault can be the cause of all sorts of errors.

Wise words here from Colin / BBS Spy who is the founder and creator of the Black Box Solutions Brand who manufacture the Faultmate amongst other kit and is the same company i linked you to above.
http://www.disco3.co.uk/forum/topic63689.html

Interesting thread here that you hopefully won't need .
http://www.fullfatrr.com/forum/post187873.html

Hi yes sorry i do have the abs unit mounted next to my suspension turret. I will keep you updated tomorrow

ok, good luck

Right removed the glove box (someone has defiantly been in here before, possibly to fit a new cd changer). There were no signs of water ingress anywhere. I removed the suspension ecu and again there was no signs of water or corrosion.

Checked all fuses and they are all good.
Checked terminals 2 and 6 on the abs plug and i have 12v with the key removed so im not losing voltage when the key is off.

Randomly the suspension has now fixed itself with no faults now shown.

When the car first came in the low range button did not work as it was damaged (drinks spill by PO) replacement switch was fitted and now working fine. Current VDU fault was there before and after switch change.

Before I condemn the abs ecu for being faulty, when i had my air suspension fault (lost communication with VDU and steering angle sensor). Looking at wiring diagrams i cannot see how the suspension ecu gets communication from the abs ecu and steering angle sensor. Do the go through another module such as centre console switch back or bcm?

I really appreciate all the help you have given

Did you check connection 12 on the ABS module as that is a Red wire also?

I’m away so a bit limited as to what I search in Rave for. With the HDC switch did you just replace the toggle switch or the whole panel? Mine didn’t work so I took out the panel and removed the circuit board that was covered in a sticky coffe residue and cleaned it with electrical contact cleaner and an old toothbrush and it started working fine.

I don’t know about communicating with the EAS ECU directly but the 2005 has a high speed CAN and looking at the extract below taken from the Disco3 BBSspy link above that may be how it communicates.

When I had a faulty wheel speed sensor and my brakes would randomly lock on the HDC, EAS and ABS were all inactive.

I am not bold enough to say your ABS module is definitely shot, I would still be looking for a fuse or other compromised ECU but without any other diagnostic evidence it’s difficukt to say where to look.
The hi low transfer box motors are a known source of confusion and various faults but I would expect to see more transmission related fault codes.

The only other thing I could suggest before sending off your module would be to try a different diagnostic scanner that is a bit more landtover friendly like GAP , Faultmate or auto logic as it is strange to not have any other fault codes.

Connection 12 is a red wire but it is not a 12v live it is an abs sensor wire. I replaced the entire switch panel as mine wasn't repairable.

I think im going to get it over my friends and borrow his autologic. I will keep you updated

Ok, I hope you get sorted, the 2006 can be a pain due to the mix of BMW and JLR electronics and try scanning all the different systems you can.
Have a good search for symptoms of ABS module failure before sending it off too

I finally fixed the issue There is permanent live that runs to the steering angle sensor from the fuse box (glovebox) the wire had a break in it. The same wire powers the clock as well so thats working as well now.

Thankyou for all your help

Top man, It seemed to be pointing towards a permanent live somewhere. Many thanks for closing off the thread, i hate it when you read all the way through a thread thinking this is exactly the problem i have and then nothing at the end. Of course you would think the clock not working would have something to do with it !!