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No marker, headlights or instrument cluster lights work?

Tiny
RCEBULA1
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 189,000 MILES
I checked 10amp fuses, swapped relay and replaced light switch component, no luck. Vehicle runs, brake lights and turn signals work.
Wednesday, October 19th, 2022 AT 2:27 PM

12 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
It sounds like the headlight switch has gone out, but to be sure let's check for power at the fuses and relays. here is a guide to help you check for the power and the headlight and running light wiring diagrams so you can see how the system works and which wires to test.

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

here is how to change out the headlight switch in case you need it. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.

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Thursday, October 20th, 2022 AT 10:50 AM
Tiny
RCEBULA1
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I replaced the headlight switch now, no headlights, no dash lights, no dome lights. No power to dark green light in the headlight switch cluster.
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Wednesday, October 26th, 2022 AT 4:46 PM
Tiny
KEN L
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There won't be power to any wires on the headlight switch, grounds only to the BCM. I would go ahead and check all of the fuses in the under hood and BCM fuse panels. You can check out the wiring diagrams above to see which fuses need to be tested. If everything is okay the BCM is out. Here is how to replace it in the diagrams below. You can get a rebuilt unit by searching Google or Ebay. Check the grounds and power wires to the BCM as well. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.
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Thursday, October 27th, 2022 AT 10:46 AM
Tiny
RCEBULA1
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  • 6 POSTS
Hi Ken, no power to the four (4) 10amp fuses but power to the headlamp relays in the under-hood fuse box.
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Monday, November 7th, 2022 AT 10:44 AM
Tiny
KEN L
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Which fuses?
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Tuesday, November 8th, 2022 AT 9:52 AM
Tiny
RCEBULA1
  • MEMBER
  • 6 POSTS
The four headlight fuses on the left side of the under-hood fuse box do not have any power. Also, the headlamp switch on the dash has power to the pink wire (I think H coding) in the wire connector. The hotwire is the last one on the 2nd row of 8 wires in the connector. The 1st row or wires has 6 wires. The pink wire becomes hot when I turn on the ignition.
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Tuesday, November 8th, 2022 AT 4:14 PM
Tiny
RCEBULA1
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Hi Ken L, any thoughts?
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Friday, November 11th, 2022 AT 9:54 AM
Tiny
KEN L
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Can you remove the HDLP low relay and check for power? At least two of the terminals should light up.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please go over this guide and report back.
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Saturday, November 12th, 2022 AT 9:31 AM
Tiny
RCEBULA1
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Hi Ken L, yes there is power to two terminals. I have swapped similar relays in and out and still no headlights.
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Saturday, November 12th, 2022 AT 10:14 AM
Tiny
KEN L
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If you have checked the wiring connections and there are all good it leaves the BCM as not working, I would get a rebuilt unit by searching Google or Ebay here is the location of the BCM so you can change it out. Also check the electrical connector for corrosion as well. To be sure a CAN scan will tell you for sure if the BCM is out you can get a CAN scanner (Controller Area Network) from Amazon from about $32.00.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Amazon CAN scanner link:

https://amzn.to/3sX8MCX

Check out the images (below). Please let us know what happens.

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Monday, November 14th, 2022 AT 9:49 AM
Tiny
RCEBULA1
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Hi Ken L. Sorry for the delayed reply but I had some health issues to contend with. Back to my headlight issue and other stuff not working (all related to the BCM). When looking for Nader the driver's side dash, I found 10 broken wires. Repairs 9 and haven’t found where the 10th one goes. The 9 were all apart of the wire loom under the dash. There were 3 white wires and unsure which ones connect together. Not sure it maters since they were all the same in the same wire loom. The 10th wire was separate and had a retainer pin to attach the wire to a wire hole somewhere but it was a factory wire. Hooked up a Tech2 and there is a U0164 code. Thinking the 10 wire (same gauge as the others) goes to the BCM. Need a BCM wiring diagram I think to sort this. Didn’t see that diagram posted on earlier in your replies. What is your expert opinion on this? Please advise.

Thank you,
Randy
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Wednesday, January 18th, 2023 AT 6:17 PM
Tiny
KEN L
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U0164 Code - Lost Communication with HVAC Control Module so this can be BCM related as well. Here are the BCM wiring diagrams and a guide to help you check the wiring. Please double check all fuses with the key on.

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

and

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

Check out the images (below). Please let us know what happens.
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Friday, January 20th, 2023 AT 9:13 AM

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