Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
Which door lock up front has failed, driver or passenger or are you referring to the lock switch?
Have you checked for simply a bad bulb in the mirror?
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The only thing that could effect all of these things would be broken wiring in the passenger door jam. If that is fine then we need to diagnose each concern individually.
If you short 2 wires together, there will be no signal communication. You asked how the 2 issues could be effected and that is the only way I can see this to occur and this is the only place these circuits get close to each other.