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Old 06-21-2019, 07:23 PM   #4
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,293
 

2003 L-Series 3.0L Sedan
Default Re: Doors unlocking going over bumps or dips

There are many parts to our cars electrical and electronic systems. The body control module does almost everything the ecm (engine computer) doesn't control. Door locks are part of the bcm and wiring/connections are part of diagnosing problems. With uncommanded door locks cycling, my guess is this isn't bcm related or wiring to/from the bcm. Initial guess is the main driver's side door lock switch and disconnecting it a first try to isolate this problem before moving on.

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