Tail light issue

Tiny
MICHAEL SKYY
  • MEMBER
  • 2004 CHEVROLET VENTURE
  • V6
  • FWD
  • AUTOMATIC
  • 223,000 MILES
Experiencing issues with the driver side (left) tail light circuit board. The brake bulb, left turn signal bulb, and reverse indicator bulb are not working. Both the top and bottom running light(s) bulbs are working when activated. However, when the left turn signal and/or hazard lights are activated, instead of the left turn signal bulb turning on, both the top and bottom running lights flash in sync with the turn signals. Tonight I am going to temporarily swap the driver and passenger side tail light circuit boards to see what happens. Any ideas on where the issue might be? Vehicle electronics is not my strong suit. Any suggestions and/or advice would be greatly appreciated! It is my understanding that tail light electrical issues with GM Mini vans from this same generation are quite common.
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Wednesday, September 20th, 2017 AT 1:40 PM

1 Reply

Tiny
CARADIODOC
  • EXPERT
Incorrect bulb operation is usually due to a broken ground circuit. Current goes through the brake bulb, but cannot get to ground for the return path. It finds an alternate path doubling back through the tail light bulb, over to the other side, then through that tail light bulb, then to ground. To verify this, observe how the left-side bulbs work, then see what happens after you unplug the right lamp assembly.
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Wednesday, September 20th, 2017 AT 6:47 PM

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