Question about 2004 GMC Envoy
There is a technical service bulletin regarding this problem with 2004 GMC envoy. Actually there are 3 separate issues with regards to the elecronic tailgate. The reason why the dealers are backordered is the part you want keeps failing after a time of being installed.
For the particular problem you have of the electronic latch not working, the bulletin recommends a inspection of the endgate connector C900. Look for the wires to be backed out of the connector or not properly crimped. To crimp you will need a crimping tool available at any electrical supply shop. The connectors can be had from the dealers.
The other solution referred to intermittent operation of the endgate but can apply in your situation also. For that, look for chaffing at the wire harness connectors for the endgate actuators located at the upper right and lower left latches. They have been found to be pinched up to 8 inches away from the actuators. In this situation it would be ideal to replace the connectors and install in a way so wires will not be pinched.
The other thing to look out for is dusty sensors. For this you will need to remove the tailgate trim panel and locate the 2 optical sensors on either side. You can feel them with your hand, they will be the size of a nickel. Clean all the dust under the trim. In addition to that you should open the switch and use contact cleaner to clean out any dust or debris inside there. There is no mechanical way to open the door once the electronic side has malfunctioned without damaging the door. I hope this helps.
Posted on Aug 27, 2010
First step would be to use a scan tool and command the solenoids
then the second things, would be jumping the solenoid, but this may be tougher than you think without special jumper tools unless of course you do not care about destroying the connectors and/or wires
however, mechanical is easy...
disconnect the solenoid connectors
disconnect solenoid from the rods
pull rods and your gate will open
if this fails then your concern is in the latch assembly itself... which I do about 6 a year at our independent shop.... what a pain!
Posted on Aug 25, 2010
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