I cannot unlock my rear cargo doors on my GMC Yukon SLT! All other doors lock and unlock, my battery is "bad' according to autozone but it still starts the truck fine, no blown fuses that I have tested but really can't find the power door fuse?? Remember I Cannot even open the doors to check the acuator or connections!

There are several potential causes for this issue in a 2003 Yukon XL 1500 slt. It is possible that there is a problem with the door lock actuators, the wiring, or the control module. It is also possible that there is a problem with the key fob or the door lock switch itself. In order to determine the exact cause of the problem, I would recommend taking the vehicle to a qualified mechanic or dealership for further diagnosis and repair. They will be able to diagnose the issue and determine the best course of action to fix it.

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2002 Yukon, rear hatch lock not locking. ... rear door hatch lock repair GMC Chevrolet. auto resource ... chevy tahoe lift gate notopening - Duration: 2:12. ... A Method how to unlock your car in 10 seconds :) - Duration: 0:35.

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Back lift gate/glass would not open or release. Even when unlocked with the key fob or the unlock switch on the drivers/passenger door. ... How To Install Replace Rear Lift Gate handle 2002-09 GMC Envoy Chevy Trailblazer ...

if the body control module is seeing any door or hood not completly closed it will not start.

Power Door Locks Circuit Description
The power door lock system incorporates door lock switches on both front doors and on the RH D-pillar, door lock motors in all passenger doors and in the RR cargo door, a door lock relay and a door lock control module.
Power for the door lock switches and the door lock control module is supplied from the CIG LTR fuse 13 through CKT 640 (ORN). Power for the door lock relay is supplied from the PWR ACCY circuit breaker through CKT 540 (ORN). Ground for the door lock relay is supplied from G202 through CKT 150 (BLK) and ground for the door lock control module is supplied from G400 through CKT 150 (BLK).
The door lock motors are reversible and both sides are connected to the normally closed contacts of the door lock relay. Those contacts of the relay are connected to G202. When any of the door lock switches are placed in the lock position, voltage is supplied through CKT 195 (LT BLU) to the relay lock coil. Since the other side of the lock coil is connected to ground, the coil is energized and it pulls the lock contacts closed. Voltage is then supplied through CKT 295 (GRY) to all the door lock motors and the doors lock. The unlock function operates in much the same manner except that when any of the switches are placed in the unlock position, voltage is supplied through CKT 194 (WHT) to the unlock coil of the relay and CKT 294 (TAN) supplies voltage to the apposite side of the door lock motor and the doors unlock.
Door Lock Control Module Description
The door lock control module is used on vehicles equipped with cargo doors. The purpose of the module is to lock the cargo doors after a lock cycle has been commanded from any of the door lock switches with the cargo doors open. When the RH cargo door is open, the module receives a ground signal from the closed contacts of the rear door jamb switch on CKT 1897 (ORN/BLK) to G400. When a lock command is received, the module retains this input until it receives an open input from the rear door jamb switch. Then the module sends a lock command through CKT 194 (WHT) to the door lock relay and the doors lock.
Rear Cargo Doors Description
The power door lock motor will not operate unless the rear cargo doors are fully closed. The power door lock motor is in the right cargo door. The contactors are on the rear cargo door opening on the body and on the right cargo door.

be sure all mechanical parts of lock are lubed and free to move lock catches could be to close to each other making it to hard for the actuator to pull

Hello,
If you armed the security system with the key Fob Transmitter it will stay armed until it is disarmed with the transmitter if the door switch is bad in the latch.
I would try to unlock the doors with your remote transmitter. If this doesnt help try to unlock your rear Trunk/tail gate with the key making sure all doors are closed. If this doesnt work you may need to perform the VTD relearn procedure. Let me know If thats the case Ill give you the instructions you need.

Roy

Harris, did you find a solution to your problem? I am having the same issue on my 04 denali. Rear doors and tailgate wont lock but the unlock fine. Front door function normally? let me know.

Either the relay for the locks is bad or the fuse. When you push the power lock on the inside if the doors do not unlock then I would check the fuses, both inside and under the hood. If they do work then the relay/s may be bad. You are pushing your key button twice correct?

how do you removed the interior cover? for the rear door actuator?

check ECC 10 AMP fuse