Odd Sidelight Problem

[txyaloo]

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.

[andrewwynn]

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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[txyaloo]

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.

[andrewwynn]

Please report back


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[wpoll]

Originally Posted by txyaloo

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.

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!

[txyaloo]

Originally Posted by wpoll

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!

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