Driver side head light assembly shorted out due to a broken wire touching the metal bumper

Tiny
ROB K
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
I was in the process of changing turn signal bulbs out for switchbacks today. In the process the main headlight after marketing wiring red and black wire broke. The red wire was broken and came into contact with the bumper of the vehicle while the vehicle was on and it shorted out the driver side headlight hi lamp, and DRL. It also knocked out the driver side tail light whole assembly (park, DRL, and brake lamp) it also knocked out the driver side license plate illuminator.
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Monday, April 27th, 2020 AT 11:14 PM

7 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

Did you repair the broken wire?

You need to test the fuses I highlighted in the diagram I attached below for power on both sides. It looks like you blew a fuse when the wire touched ground..

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Make sure you solder and shrink wrap the repair on the wire. Butt connectors are not a good repair.

https://www.2carpros.com/articles/how-to-check-wiring

Roy
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Tuesday, April 28th, 2020 AT 4:29 AM
Tiny
ROB K
  • MEMBER
This is for a 2007 nbs Silverado? The images of the wiring diagram and fuses are hard to read the blue circle covers the fuse numbers in image 1.
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Tuesday, April 28th, 2020 AT 11:50 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, sorry about that. I blew it up even bigger for you without the circles.

Make sure you test for voltage on both sides of the fuses. These boxes had a high failure rate for supplying voltage.

Roy
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Tuesday, April 28th, 2020 AT 12:03 PM
Tiny
ROB K
  • MEMBER
Thanks. Repaired the wire and all the fuses you suggested. Everything works now. However, I still have a hyper flash issue on the passenger side headlight and tail light. Can you inform me of the relay that is responsible for this function?
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Friday, May 1st, 2020 AT 12:44 PM
Tiny
ASEMASTER6371
  • EXPERT
Thank you.

This vehicle does not use a traditional hazard/turn signal flasher. This function is controlled by the Body Control Module (BCM).

There is no flasher as in the old days.

The BCM controls the speed of both 4 way and turn. It may have been damaged from the short circuit issue.

I attached a picture of the location and the procedure for you. It is a programmed module.

Roy
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Saturday, May 2nd, 2020 AT 3:53 AM
Tiny
ROB K
  • MEMBER
Hello,

You earlier commented on this posting saying that "These boxes had a high failure rate for supplying voltage." What does this mean exactly?

I had an issue when changing my bulbs today and the protective sleeve for the wiring was misplaced and the wire came into the the housing fixture fastener screw and washer. The headlight is not working on the side where that had happened. The DRL lights do not come on as they do normally. For whatever reason only when turning on the turn signal will the DRL's come on and flash in succession with the turn signal at a hyper-flash speed. The DRL headlight and tail light only come on with the turn-signal function and all hyper-flash. Any idea what the problem is here and what can I do to fix it. I am going to replace the fuses you included in the diagram earlier in this post. If I were to disassemble the dash to get to the BCM and unplug everything and re-plug it in would that potentially fix the issue?
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Saturday, June 27th, 2020 AT 12:05 AM
Tiny
KEN L
  • ADMIN
It could, but I would check the system grounds. Here are the complete headlight wiring diagrams so you can see how the system works and where the grounds are. If the grounds are good the BCM needs to be replaced here are the instructions for that as well. Check out the diagrams (below). Please let us know what you find.
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Monday, June 29th, 2020 AT 10:43 AM

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