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Do the backup lights work off the transmission or a switch on the column

Posted by boat3076 on


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I can relate ... been without reverse lights for a while.
Here's my understanding of the communications that take place in this process: when you put the vehicle in reverse, there is a backup light switch on the transmission that sends a signal to the Transmission Control Module (TCM), that then forwards that information to the BCM, and the BCM sends the signal to the backup lights.

Have had different diagnoses for the problem ranging from BCM (body control module), to FCM (front control module), to the standard bulb, wiring, etc. Dealer wanted to do a $1000+ job thinking it could be the BCM. Being cheap decided to do some troubleshooting on my own ... with help from another site where I contacted a Dodge Expert.

In my case, we tested wiring, and found there was a fault in the wire ... replaced with a new wire.
So sending 12V to from the battery to the lights made the reverse lights come on -- so wiring and bulbs good.

Didn't fully fix the issue ... tested the pin from the BCM that carrys the signal to the backup lights to come on and found that the BCM is NOT sending out the signal. Looks like it is a BCM issue but want to check to make sure the BCM is getting the right input signal. So that is now where my testing will go.

Hope that helps.

Posted on Oct 06, 2008



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I think they work off the transmission as the dealer fixed mywife's last year and it was covered unde rthe powertrain warranty. Unfortunately, they are not working again this year at inspection said that it may be the body control module going bad. I disconnected the neagative battery terminal for 20 minutes to reset it and see if the reverse lights came on, but no may try it though. I'm still stuck without reverse lights...let me know if you find anything [email protected]

Posted on Aug 31, 2008


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