Question about 2003 GMC Envoy

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Door will not unlock

The rear door on my envoy is will not unlock. Could this be a fuse issue?

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  • Rod Lambert May 15, 2009

    found the fuse labeled lock, but it's a black box, how do i tell if it is blown or needs to be replaced?

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  • Master
  • 253 Answers

Look under the back seat behind the drivers seat. There is a fuse block. remove the cover and check the fuse labled lock. Good Luck

Posted on May 15, 2009

  • Mike White
    Mike White May 16, 2009

    You can test it with a test light, or remove it and look at the little (wire) inside it. If it is blown it will look burned.

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2006 GMC Envoy: I tested all of the fuses and all of them check out but my power locks, cabin lighting, dash panel lights, etc. aren't working.


Which fuse box ? Do you know what a DDM -is ? Driver door module . Do you have any idea what all is involved in making these thing's you have listed work ? A lot more then a fuse , there could be DTC'S - diagnostic trouble codes stored in the principal Control module ,the BCM , That could save a tech. valubale time in diagnoising this problem !
Door Lock System Components
The power door lock system consists of the following components:
• Driver Door Module (DDM)
• Passenger Door Module (PDM)
• Liftgate Module (LGM)
• Door lock relay
• Door unlock relay
• Body Control Module (BCM)
• Reversible door lock actuators in each of the doors
• LR/RR LOCKS 10A fuse (relay supply voltage)
• Door lock switches in driver and passenger doors (switches are integral components to the DDM and PDM)
Did you know there is a fuse box in the rear of the vehicle ?
Fuse Block - Rear
Beneath the left rear seat
The inside lights are also controlled by the BCM , and the fuse's are also located in the rear fuse box .
The body control module (BCM) directly sends a 5-volt reference voltage to the instrument panel (I/P) dimmer switch which is then adjusted based on the I/P dimmer switch position and returned as a low reference and a signal to the BCM. The BCM uses this signal to directly control the desired level of instrument panel illumination lamp intensity.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2620 Display Dimming Pulse Width Modulation (PWM) Input Circuit. There are several DTC'S that can set !
DTC B3801 Passenger Compartment Lamp Request Circuit
DTC B2610 Passenger Compartment Dimming 1 Circuit plus others for power locks .
Thank You Uncle Sam

Nov 29, 2016 | 2006 GMC Envoy

1 Answer

Right & left rear doors do not lock with remote or door lock switch.All doors unlock from remote & switch,& front lock w/remote & switch. I replaced both electric actuators & lubed mechanism but still rear...


Sounds like your door module is the issue. You can try to disconnect the battery for 5-10 minutes then retry or GMC to see if there is a recall.

Oct 15, 2013 | 2003 GMC Envoy

1 Answer

2006 envo GMC Envoy back hatch will not open


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1 Answer

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1 Answer

None of the buttons on the driverside door panel on my 2002 gmc envoy work


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1 Answer

No power to my drivers door on my GMC ENVOY


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1 Answer

2004 GMC Envoy rear hatch complete door wont


I have this same problem currently...did you find anything out about it?

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1 Answer

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1 Answer

I have a 2006 GMC Envoy Denali. The power locks on both the rear passenger side wont unlock automatically. i have to manually unlock it. although the automatic lock option works. All the other doors work...


both the rear passenger side wont unlock ???? How many doors are on the passenger side ? Or both back doors don't unlock ? Two relays lock / unlock the back door's Not the lift gate . The BCM controls the relay's . The relay's are located in the rear fuse box . Under back seat .

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