Question about 2007 GMC Yukon XL Denali

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2007 Yukon Xl Denali can the headlight switch/dimmer cause only the tail lights to not work. Dash lights, signals, brake lights when pressed work. Both sides went out. No blown fuse or broken wires.

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  • dmgtx140 Apr 28, 2015

    Paulmacintyre thank you, park lights aren't working, have new switch coming in mail tomorrow, we will see. Do you happen to know what the green wire is to that unit. It was purposely cut/not connected, wired it up though and it did nothing.

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  • GMC Master
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If front park lights are working highly unlikely headlight switch is the issue. Is the vehicle equipped with a trailer towing package and wiring to the rear? I would start there. This vehicle may also have a taillight module located under the vehicle on the passenger rear attached in the wheel well area that goes bad

Posted on Apr 26, 2015

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2003 Pontiac Vibe no tail lights, brake lights and turn signals work just fine. The dimmer switch does not dim the dash lights but does work the dome just fineand the lights for the Heat/AC are off.


The tail lights work off the headlight switch, and there is a fuse for the tail lights. Make sure the fuse is good, first, a 15 amp (blue) fuse in the instrument panel fuse block. Then, you might have a bad headlight switch.
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FROM LUSTY KID:

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