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Are you reverse lights stuck on ?

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If your reverse lights are stuck on and your mechanic has ruled out the range selector on the transmission and any mechanical reason, unplug your Onstar equipped mirror and see if they go out. The Onstar system receives a signal from the reverse lights to let the support person know if you are in reverse. I have seen the mirrors short out and back feed voltage to the lights. It doesn't matter if you subscribe to Onstar or not, this is an electrical issue.I can confirm this for 05-07 GM models with Onstar. Possibly other years, but I haven't physically seen this, so I can't say for sure. Swapping mirrors is the easiest fix.

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