Question about 2003 GMC Sierra 1500

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My brake lights have stopped working. The high light above the rear window works fine and the rear signal lights are ok, too. I have replaced the bulbs and ckecked the fuse. Could it be the switch on the pedal even though the high light still works?

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Hello,
The rear turn signals are wired through the Multifunction switch also called the turn signal switch. The Hazard switch is in that switch also and thats the circuitry the brake lights go through. You need to confirm voltage at the White wire off of the brake light switch and if its ok you have a bad multifunction switch.

I hope this helps.

Roy

Posted on Nov 17, 2009

  • eighpman
    eighpman Nov 04, 2012

    I have a problem too my brake lights dont work at all everything else works fine just the brake lights don't work checked fuses and replaced the brake light switch and still don't work

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