2006 GMC Savana parking light wont shut off

Tiny
JD1015
  • MEMBER
  • 2006 GMC SAVANA
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 199,000 MILES
My parking light wont shut off even if turn the headlight to off and the key is off and removed. I know there is body module that suppose to shut off the lights if left on. But the parking light stay till I pull the parking light control relay from the fuse panel under the driver seat. I have try two diffenit relays but the problem stay the same. The wiring diagram I have are from Chilton. What should I try next?
Thursday, August 6th, 2015 AT 8:14 AM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I can talk to you about the basics. The voltage to the park lamp relay is hot all the time. So, you need to check ground for the coil side of park lamp relay, that is a white wire. With headlamp and key off, You could use a digital multimeter, one lead connected to voltage, the other lead, touch the terminal for the white wire, if reading is battery voltage, the white wire is grounded for some reason, either through the bcm or the white wire is shorted to ground.

Also, you need to check the park lamp lamp turn on signal, goes from headlamp switch to bcm, brown wire with white tracer. At least for the park lamps, the headlamp switch is part of the ground circuit. You can take that wire loose from bcm and use the dmm the same way, if battery voltage, either that wire is shorted to ground or the headlamp switch has a problem? There are many ways to check the circuits? Others may have a better idea?

I can't rule out a bcm issue? Can you check for applicable trouble codes?
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Thursday, August 6th, 2015 AT 1:30 PM
Tiny
JD1015
  • MEMBER
  • 3 POSTS
I did not see code when I used my code reader Thank you for the information, I was not sure how the bcm works or if the headlight switch was the only control for it I will check the wiring this weekend and let you how it work out. Does the bcm control the headlight warning alarm also because I do not hear it. When I left the headlights on.
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Thursday, August 6th, 2015 AT 3:11 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I just wanted to add, sometimes if you unplug a module, it can have unintended consequences, But, if your going to do an ohms test, I don't how else to do it, except unplug at both ends. I just didn't want to cause more problems than you already have.
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Friday, August 7th, 2015 AT 12:03 PM

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