BeanMeansCLS

Hi - recently had to disconnect batteries from the car for a while whilst my BCM was getting replaced, once I reconnected everything I noticed that my dome lights weren't working as well as the roof thinking it was open when it was closed.

Scanned the car and it seems like I can't communicate with the overhead control panel (OCP - the dome light module), I've checked the fuse for this (fuse 38) and it seems okay...is it likely that it's just died? The lights have flickered before a few times in the past few months...

Does anyone have a pinout/wiring diagram for the dome light module so I can check if it's even receiving power?


, there's no communication to the

MikeJ65

Power/ground are connector B, pins 4 & 6. Red/violet for power and of course brown for ground.

BeanMeansCLS

Thanks, just checked and it's getting 12v power, assumed board has gone kaput so have ordered a 2nd hand one to test....hope it works!

BeanMeansCLS

So I fitted a used dome light today, everything seems okay so the old one must have had a fault on the board...however we now have 2 new problems:

The first is that the onboard temperature sensor seems to show a strange value? I've checked the thermistor and it's showing 10kOhm which I believe is correct (goes up and down with temperature changes). Climate control seems to be working ok though? Not sure what this means.



The second is that I now get an error B1643: Component B38 (rain sensor) communication error or circuit fault and my auto wipers don't seem to be working (tested with water spray)

Any ideas?

MR.AMG.

Hi can you please tell me where the connector is i am trying to trace the same fault code
uk

BeanMeansCLS

Hi MrAMG, which fault are you referring to?

MR.AMG.

Hi thanks for replying i have traced the fault and found some corroded wires.. would you know the cable size i could use?