why would high beam not work

Asked by carr6472 Mar 20, 2019 at 04:09 PM about the 2010 GMC Sierra 1500 SLE Crew Cab 4WD

Question type: Maintenance & Repair

Hi hubby high beam not working. changed wire harness. and checked fuse. changed fuse. still not working

3 Answers

27,530

https://ibb.co/fYRnCfh The diagram should be for hi beam. See the fuses, use a test light to check voltage at fuses, headlamps on hi beam. You can see that relay, you can't remove it, by the way. The multifunction switch signals the bcm about hi beam then the bcm grounds the control side of relay. I saw a trouble code for hi beam. to check codes, you need an obd2 code reader that will work with your vehicle and read manufacturer specific codes. The code I saw was a B type code. If the link for wiring diagram doesn't hi-lite, type into address box.

1 people found this helpful.

The 'flapper' in the projection tube isn't working properly...there's only one bulb for high/low, the 'flapper' simply directs the light at a higher angle...there is no separate high-beam bulb.

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