HELP...both reverse lights are out!

[gfarn1]

How do I know if its the module?

JCL, why do you say "Hopefully you didn't damage the lighting control module"? Expensive and/or hard to replace?

Thank you!

[x3oiler]

Originally Posted by gfarn1

How do I know if its the module?

Ah sorry. Too brief. The fact that the standard BMW trailer lighting module cannot run LED trailer lights suggests to me that the BMW car lighting cannot run LED lighting either. That was my inference.

[JCL]

Originally Posted by gfarn1

How do I know if its the module?

JCL, why do you say "Hopefully you didn't damage the lighting control module"? Expensive and/or hard to replace?

Thank you!

By troubleshooting with a test light. Check fuses, check power at the bulbs.

I don't know what you meant by 'playing around' but the lighting circuits are not straightforward. BMW multi-plexes the signals, meaning they send multiple control signals down the power wires. It is possible to damage the computerized lighting control box that runs all the lighting (the LCM) by playing around. Imagine what could happen to a computer circuit board if you applied power to it at the wrong voltage. Worst case is having to replace the LCM. Yes, that can get expensive. But the first step is to troubleshoot the actual problem, instead of speculating.