Question about 2002 Chevrolet Monte Carlo
The back up lights are activated when you put the car in reverse. A signal is sent to the PCM (power control module), the PCM sends a serial message to the BCM (body control module). The BCM then grounds a relay in the under hood fuse center, power is sent by the relay to the rear backup lights.
So, if your back up lights are "flashing" when you use your remote, we know the circuit from the BCM all the way back to the back up lights is good.
The problem appears to be with the transmission park/neutral switch is not sending the signal to the PCM for some reason. It could be the switch or connection or wire from the transmission park/neutral switch to the PCM.
A service tech will be able to scan the ECM and determine if the switch is functioning or not.
If you wish, you can check the connections at the transmission and PCM, but they are somewhat difficult to get to.
Hope this has answered your question, let me know if there is anything further.
Posted on May 12, 2009
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Posted on Jan 02, 2017
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