Question about 2002 GMC Yukon Denali

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Brake lights and crusie don't work

My denali has lost it's brake lights and cruise. All other lights are working correctly. tail lights and turning signals all work. What I think it is, is the brake switch on the brake pedal could this be the fix? Also the cruise stop I think around the same time. I have changed out the brake switch and that didn't help. I also don't see any voltage at the brake lights

Thanks
Sam

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  • lkreb Jan 22, 2009

    I have the same problem. Did you resolve and if so what fixed the problem.

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  • 32 Answers

1ST THING TO CHECK IS THE STOP LAMP FUSE . FUSES LOCATED LH SIDE UNDER HOOD. THIS FUSE ALSO POWERS THE ACC. CIRCUT IN TRUCK. ALOT OF TIMES, LAP TOPS, DVD PLAYERS ETC. OVERLOAD CIRCUT & FUSE BLOWS.

Posted on Nov 08, 2008

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  • 99 Answers

SOURCE: 2002 YUKON XL Denali no brake lights or cruise

FROM LUSTY KID:

Check your bulbs first, I have lost both headlights on my ford at once on account of the bulbs burning out at the same time. Same thing probably happen, you have one filament out. The lights can work, but if the filament for brake is burnt, you don't see brake lights.

As for the cruise control. Check fuse box first. If OK check vacuum hose to actuator in engine compartment for starters.
Advise:

Posted on Dec 02, 2008

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2004 gmc denali: backlit dash lights do not work


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If so do the turn signals work?

If they do than I would bet that the turn signal switch itself is the problem. The power for the brake lights is routed through the switch (except for the third brake light that is supplied power directly form the brake switch). The turn signal switch will interrupt power from the brake switch and supply power from the turn signal flasher depending on if the right or left turn signal is engaged.

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If you have lost signals, brake lights and tail lights, then it is more likely that the ground supplied to the bulbs is not working, since the tail lights share noting in common with the brakes lights and turn signals but ground.

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The solution will be finding the wire from the cruise that senses the brake lights, and connecting it directly to the brake switch, IF the brake switch is grounded when the pedal is not pressed. You may have a relay wired to the brake pedal switch to make this happen. Seek a knowledeable car audio/accesory shop familiar with auto electrical to help you with this.
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The cruise control is terminated by the brake lamp circuit, Check the brake, tail lamp for water or a short. Your turn signals are on a different circuit. Check the bulb sockets closely for corrosion. Failing this check connectors for the tail lights for possible water penetration, or loose connections.

Hope this ia of some help
Ed

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1 Answer

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Good Luck and hope this helps.

Mar 15, 2009 | 2002 GMC Yukon XL

1 Answer

2002 YUKON XL Denali no brake lights or cruise


FROM LUSTY KID:

Check your bulbs first, I have lost both headlights on my ford at once on account of the bulbs burning out at the same time. Same thing probably happen, you have one filament out. The lights can work, but if the filament for brake is burnt, you don't see brake lights.

As for the cruise control. Check fuse box first. If OK check vacuum hose to actuator in engine compartment for starters.
Advise:

Oct 12, 2008 | 2002 GMC Yukon XL

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