[willisodhiambo]

I am stuck with this problem. This car has had a rear collision. I found ehc faults which i traced to a previous attempted repair that interferred with the wiring. A few weeks later, all traction warnings appeared. Main fault is this mode change problem.

Test plan suggests the following
1. Voltage - i have checked and double checked
2. Pt- can - all ok, bus is alive
3. F- can - seems ok, bus alive
4. DME - replaced
5. CAS- replaced
6. AL module - replaced

In ista there is suggestion to change supply lines to 6mm2 wires but they are already huge!

Any ideas? Steering angle sensors seems ok and passes the test in active steering initialization, but final step where we turn lock to lock goes on indefinately. 

Any suggestions?

[willisodhiambo]

Oh and just to add, WUP was also one of the things to check. I supplied 12v direct to it. No difference! I have no more ideas except replace everything in the system, steering rack and angle sensor but that may be very expensive if the problem could be elsewhere

[willisodhiambo]

Well, found a solution. I noticed when i disconnect the steering rack the fault would disappear. So i figured AL was referring to test voltage. It sends a test voltage on startup, but if any of the rack sensors does not report back properly it pops the voltage error.

Strange BMW did not have a more comprehensive procedure. They send you on a wild goose chase to check cas, dme, ptcan e.t.c

Got a used rack, installed, all good!