2003 Suburban Rear Door Lock problem

MBOUL52

MEMBER
2003 CHEVROLET SUBURBAN
V8
4WD
AUTOMATIC
98,000 MILES

2003 Chevrolet Suburban Rear Doors will not lock, all doors will unlock properly.

Sunday, April 3rd, 2011 AT 3:31 AM

8 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Have the actuators checked, they could be weak and not allowing the doors to be locked. Check lubrications and alignment of actuators.

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Sunday, April 3rd, 2011 AT 4:04 AM

MBOUL52

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4 POSTS

How would one tell if the actuators are weak. Also if the rear door relays are working correctly? Is the relay used in the power on position to unlock doors, or power off? Is this a dealer only option?

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Sunday, April 3rd, 2011 AT 5:50 PM

KHLOW2008

MECHANIC
41,814 POSTS

The rear door lock and unlock uses different relays for locking and unlocking. Hey are located in left instrument panel fuse box (lower left side of dash). They can be tested but the easiest way is to swap them around and if problem changes to unable to unlock, then we know the relay is bad.

For actuators, you need to remove the door panel and disconnect the actuator wires and test with battery voltage.

I believe that part cn be sourced from parts outlets.

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Sunday, April 3rd, 2011 AT 7:43 PM

KHLOW2008

MECHANIC
41,814 POSTS

Sorry I forgot to attach the diagrams.

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Sunday, April 3rd, 2011 AT 7:45 PM

MBOUL52

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4 POSTS

Your help is appreaciated. The problem was the relay, swapping the relays caused the 4 doors to lock, and only the two front unlock. I can live with that until I replace the relay. Thanks a bunch.