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1999 Cadillac DeVille Question: courtesy and map lamps won't turn off as they should

 

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perplexed, Hermitage, MO, May 04, 2009, 16:02
 Rookie

courtesy and map lamps won't turn off as they should in 30 seconds

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  • Answer #1

    Russ May 08, 2009, 10:55
     Master

    Do the light turn off after about 20 minutes? That is when the battery rundown protection kicks in. The Body Control Module controls the courtesy lights. I would suspect that one of the door inputs is telling the BCM to keep the lights on. Using a scan tool to read the date stream from the BCM may help in determining which input is keeping the lights on. I may be the case where each door switch will need to be disconnected one at a time to try and isolate the fault.

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