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Carl’s Corner – Auto Repair Help DIAGNOSE – POWER DOOR LOCKS DON’T WORK PROPERLY By Carl O’Reilly SYMPTOM SUMMARY The power door locks are all inoperative or a single door lock is inoperative. USUAL CAUSE The power door locks utilize individual solenoids in each of the doors that activate the door lock mechanism. The switch provides power to the door lock solenoids. To lock the doors the switch provides voltage to the two terminals of the solenoid. To unlock the doors the switch reverses the polarity of the voltage applied to the solenoid.

An inoperative power door lock can be caused by the switch, solenoid, wiring problem or mechanical problem within the linkage of the affected door. DIAGNOSIS If all of the door locks are inoperative, start your diagnosis at the fuse box. Inspect the fuse that protects the door lock circuit to ensure it is not blown. Consult the fuse box placard or your owners manual for fuse designations and ratings.

Operate each door lock switch in the vehicle to determine if the doors can be locked with any of the switches. If the doors lock with any one switch the most likely problem is a defective switch on the door that is inoperative.

If all of the door lock switches are functional but one door fails to operate, the most likely problem is an open circuit in the circuit between the switch and solenoid or a defective solenoid in the affected door. You should listen to the affected door while energizing the door lock.

If a click is heard but the lock did not engage, a problem with the door lock mechanism or linkage is the most likely cause. PRECAUTIONS, TIPS, and NOTES An inspection of the rubber boot and wiring harness that connects from the door frame and the door can often reveal wiring damage. A volt meter, available at any auto parts store, can be used to check the voltage to the individual lock solenoids and switches. Refer to the meters instruction for proper usage and precautions. Continued in.

My 1997 2500 Suburban has a different twist. The lock/unlock switch on the driver side arm rest will not activate the door locks.

They all function automatically by locking when the truck is started and placed in gear and by unlocking when the truck is shut off. I checked the fuse box and found #13 fuse blown. It pops immediately when a fuse is installed. It is labeled “cig liter” but the cigarette lighter works even when this fuse is unplugged.

I metered the fuse slot and see the top terminal is hot (12v) and the lower peg is a hard ground. I tore the driver door apart and inspected all wires and found nothing apparent. I even replaced the door lock switch but it didn’t change anything. I now have a spare, I believe. This problem started while at the dealer getting a winter service.

They kept it for 5 days and returned it un-repaired but without any cost. Codec Storex Mpix 457 Hdmi To Rca. Anyone have an idea how to troubleshoot this?

I am also having intermittent problems with the rear barn door lock. It is intermittent – so I took that door apart and disconnected the solenoid. It won’t lock, but I don’t have to crawl over seats to get it open.

Please let me know if I am missing something or if any of you have seen something similar. My email – Happy New Year – and best wishes for the entire year. Hi Carl – I’m trying to help a friend diagnose door lock problems with his 2008 Chevy Malibu. The interesting aspect of his problem is that when he first gets into the car, he can actuate (open/close) all four door locks. If he tries doing it again, only three of the door locks actuate. If he tries it yet again, only two actuate. He gets to the point where only the right rear door lock functions.

It’s also the case that each time he actuates the system, there is sound in the other lock solenoids, but it gets weaker with each actuation. If he turns the car off and then on again immediately, this situation persists (i.e. Only the right rear door lock works). However, if he lets the car sit long enough (I’m not sure how long is long enough), the system seems to reset and the same pattern as described above reoccurs.