brake lights, turn signals not working when headlights are on

Asked by Jun 21, 2017 at 07:20 AM about the 2003 Chevrolet Suburban 1500 4WD

Question type: Maintenance & Repair

Initially noticed that the turn signal indicators on the dash came on when
braking and both turn signals rapidly flashed when signaling while braking.  
Replaced the hazard warning and turn signal module but the problem
persisted.  Replaced the towing and brake wiring harnesses.  Removed and
replaced all light bulbs, checked wiring and connections from the dash back.  
Replaced both interior and engine fuse boxes.  Pulled the dash and checked
brake and signal connectors.

Only thing I haven't replaced is the BCM and the main computer and the
problem persists.  No problems with stereo, other dash components, problems
engine starting or performance so I don't think the BCM or PCM would be the
issue?

At this point, everything works until the running lights or headlights come on
and then the problem returns.  No brake lights, all turn signs begin to rapidly
flash no matter which direction I am turning.  Love the truck but am out of
ideas.  Suggestions???

No answers yet

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