1996 GMC Sierra automatic door locks

1996 GMC SIERRA
150,000 MILES • V8 • 4WD • AUTOMATIC
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DRIVER
  • MEMBER
  • 1 POST
key fob lock/unlock failed when windshield was replaced. (no other work done @ that time). electric locks still work with driver door control.

alternator failed (diode plate and voltage regulator) and while operating vehicle on with damaged electrical system, the auto door locks started working (the ones that lock when vehicle goes into gear, and unlock when in park). When alternator was repaired and reinstalled, auto locks no longer work.

I suspect a relay somewhere, but schematic doesn't show one that would seem to control either/both problems.

help

thanks
Dec 22, 2009 at 3:01 AM
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RACEFAN966
  • ✓Experienced Mechanic
  • 5,029 POSTS
Ok the locks are controled by the keyless entry module behind the instrument panel or it could be door lock relay under the center part of the instrument panel. Now if you have a digital multi meter we can do some testing.
Dec 23, 2009 at 2:34 AM
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