Odd Sidelight Problem
 

Yesterday I noticed my driver side sidelight was out with no messages in the cluster about it.

I swapped in a known good bulb that also won't work. When I turn the headlights on, and hit the plug with my multimeter, I see 12v. If I turn the hazards on, I can see the voltage and continuity flashing on the multimeter along with the other lights so I know the circuit is getting 12v power and being controlled by the LCM.

Once I add any type of bulb to the socket, all power gets cut (verified by back probing on the connector). As soon as a bulb/load is removed from the circuit, power is restored. Does this sound like an LCM issue where it's cutting power? Any thoughts on where to start troubleshooting? I plan to hook up INPA tonight to see if there are any codes.

I have the same problem. When I bought my car that side blinker was non operating. I swapped bulbs with the other side and the right side works and the left side still doesn't.

I took apart my dash to try to trace to a broken wire but I don't think I ever measured voltage no-load which is a big clue. It's acting as if there is a huge resistance somewhere in your case: 12v no load and 0v with load. I tried to trace the wire to find out where a bad connection could be but it was getting me very confused since it's apparently not parallel wired with the left front turn signal which works.

I still want to solve this annoying bug hopefully somebody else has already solved in the past


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I had lots of weird LCM errors that didn't actually list the error code when I pulled them. I've had an issue for years where the interior light dimmer only moves about 3 levels from low to high. This is also controlled by the LCM. I may grab an LCM from the pick and pull this weekend and see if that fixes both issues. It's the only thing that makes sense.

Please report back


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Be careful swapping out the LCM with a used part. While it can be done, I think it requires careful coding to avoid messing up your cluster - the LKM (LCM) and cluster share duties wrt. storing the odo reading (mileage).

Do some research before just popping it in there! :thumbup:

I have PA Soft and NCS Expert. I've dumped the coding from my existing LCM. I know a used one has to be reprogrammed with the car's VIN/mileage to keep the tamper dot from appearing.

Sounds easy in practice, but I've never had to swap one before