Diagnosis by parts replacement is getting a little frustrating and expensive is it? Did you bother to scan the BCM for fault codes before replacing it? Have you scanned your new BCM for fault codes?
Have you verified proper operation of the Inadvertent Power Relay? Have you verified proper operation of the courtessy lamp relay? Have you checked to see if the BCM can command the courtessy lamp relay on? Is the BCM recieving power from the Inadvertent Power relay? Are your courtessy lamps recieving power from the Inadvertent Power relay? Is the courtessy lamp relay providing a good ground for your interior lights?...These are just SOME of the possibilities - that is what DIAGNOSIS is for...
Please also read the following article:
What Else Could Be Wrong?
×