Repairing E70 with major electronic problems

[heze]

Good morning all,

I recently bought an E70 with major electronic problems. The former owner had an empty battery and tried to jump start it with the + and - reversed for about half an hour.

I already have all CAN busses running again and all modules (exept for one) are running and reprogrammed to VIN again (replaced 5 modules), so the car now tells by itself what problems are still present. For now, I have a few problems which are very difficult to solve, that is why I'm asking for your help:

1. The car misses the steering angle sensor value. I already bought another (used) sensor/lever assembly, but the DSC still cannot retrieve the signal (stays at 0.00 in ISTA). The strange thing is: the signal must be there, because the ARS module displays the steering angle correctly. I tried to recode the steering angle via ISTA (via the DSC module) but this results in an error that it cannot be coded after it askes to switch off the ignition. I have the idea that the car won't get to the sleeping mode after the ignition is off, and that this can be a possible reason why the coding is not succesfull. I will investigate this, but if someone has an idea what is going wrong, please tell me!

2. The FRM was also bricked, and I managed to get it back to life with ICPROG and directly programming via the pins on the microcontroller. Now I programmed the available FRM firmware via Winkfp. In the SP-daten, only firmware FRMR3 is available for the E70, and I have a FRM3 E70 AHL FRM-module, so this is not 100 percent spot on. Now the FRM gives errors about the SMC controller of the headlights on both sides, switch block in driver door (does not work), driver mirror (does not work), interior dimmer potentiometer (does not work), and lighting is not correct.

Does the FRM unit needs additional coding to get most components (mirror, potentiometer, power windows) working, or should this already be covered with the standard coding, which came with the firmware? Since about 1000 parameters can be coded, it is a major task to code everything right. Is it also possible that the not 100 percent firmware match causes this problem? How do I obtain the correct firmware?
The last possibility is that the FRM unit is damaged because of the initial problem, and needs to be swapped. I was already looking for a used FRM, but it is very hard to find exactly the same unit. I can find a FRM2 E70 AHL, but this is not the same as the old one (FRM3 E70 AHL). What are the differences between these FRM's?

As you can see: a lot of questions. Hopefully there is someone on this forum with answers to these questions which will help me getting this E70 back on the road again!

Thanks in advance and best regards,
Hendrik Zeilstra.