GMC Denali Rear door locks won't unlock

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11-28-2012, 11:10 AM

DJLyder

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GMC Denali Rear door locks won't unlock

My son has a 2004 GMC Yukon Denali. The rear passenger and driver door locks will not unlock using either the key fob or door switch. We have checked the door lock solenoid, replaced the "unlock" relay in the fuse panel and checked the fuse for the locks. All appear to be okay. All 4 locks will lock with either the fob or switch and the front locks will unlock.

I have read through some of the posts. The only items I have found here point towards re-flashing the PCM? and the possibility that there may be another fuse somewhere.

Any thoughts would be appreciated.

DJL

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11-28-2012, 12:40 PM

jwfirebird

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this one says with out ye9 i dont know what that is but i would guess since the front works you have a open wire somewhere around that instument panel fuse panel because thats the only place they are together.

this is with ye9, either way there are tan and gray wires it seems the only way it would work the fronts only

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11-28-2012, 01:41 PM

DJLyder

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Thanks Jwfirebird,

I thought that may be the problem, but I didn't know where those wires converged. I'll have to take a look and see if I can find the diconnected wire(*).

DJL

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11-28-2012, 02:29 PM

jwfirebird

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rethinking how it works. the ye9 i looked up it means uplevel which i assume the denali would be. so the ye9 front doors are controlled by modules but the rear are wired to the lock/unlock relay. so the way it works ground is on both sides then the bcm sends 12v to which ever side it wants to work. so given that both sets of wires to the relay have to be good. im guessing since you said the relay was replaced maybe the socket were the pin is, loose

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