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2006 Envoy XL: an intermitent problem with the head light low beams

 
 
 

Customer Question

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We have a 2006 Envoy XL that has an intermitent problem with the head light low beams. 3 times the low beams have not come on when starting the car at night with the switch in the Auto position. using the switch will not turn on the low beams. The hi beams will work however. Also twice while driving the low beams have gone off. Both times there was an audible click when the low beams went off. Again the hi beams would work. In each case the low beams would work the next morning when the sun was bright enough to have the automatic sensor keep the lights from coming on while the light switch in the Auto position. There are no blown fuses and Hi Beam Relay is OK. Is there a possible problem with the solid state headlamp driver module? Thanks for the help. Jim

Submitted: 971 days and 9 hours ago via OnlineAutoRepair.
Category: GM
Status: CLOSED
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Optional Information

Year: 2006
Make: GMC
Model: Envoy XL
Engine: L6

Already Tried:
Checked bulbs, headlamp fuses, all fuses, hi beam relay and headlamp switch. The headlamp driver module is solid state, but removing it when the low beams are working does not make them go out.

 
 
 
 
 
 

Accepted Answer

hi i can help you this is a fairly common trouble and here is a test for you do perform.

 

Customer Concern:There are no low beams or Daytime Running Light (DRL) operation. The high beams and flash to pass work fine.
Tests/Procedures:1. At the HDM relay, remove it and verify there is a hot at all time feed coming to the relay.

2. If OK, then swap the HDM relay #16 with another same part number relay and see if the lights start working.

3. If the lights do not work, check the Pink/White wire from the relay to the Body Control Module (BCM) for opens or shorts to ground.

4. If the wire is OK probe the wire to see if there is a square wave signal on the wire with lights commanded on.
Potential Causes:Open Fuse
HDM Relay
Wiring

Picture
Expert: GMC Expert
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Accepts: 423
Answered: 9/25/2009

ASE Certified Technician

30 yrs experience, ase certified, shop owner

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