Power door locks, locking on their own at times?

[Matt]

I’ve noticed my 97 Accord (that I recently purchased) will have its power door locks lock on their own under this scenario:

I’m in/out of the car, the doors are already locked, and then the locks will begin locking on their own intermittently. This does not happen all the time, and I’ve not noticed a pattern on when this occurs.

How do I troubleshoot such an issue?

Topic

[Lorrin Barth]

Do you have a key fob in your pocket?

[Matt]

It’s a LX, so no keyless entry.

[Matt]

Anyone?

[jacobnbr1]

Door lock actuators are pattern here. See repair track 6113

If the power door locks repeatedly keep trying to lock the doors, test the lock input to the door lock control unit from the driver’s door lock actuator. The door lock control unit sends out a reference voltage on a Blue/White wire to the door lock actuator. The door lock actuator takes this Blue/White wire to ground when the door locks are locked to signal the door lock control unit that the door has locked. If the contacts in the door lock actuator do not properly ground the reference voltage, the door lock control unit will keep trying to lock the doors until the voltage completely goes to ground. To test, remove the driver’s door panel and locate the Blue/White wire on the power door lock actuator. With the positive lead of a digital volt ohm meter (DVOM), back probe the Blue/White wire on the power door lock actuator. Place the negative lead of the DVOM on a known good ground. Observe the voltmeter and verify that the voltage drops near 0 volts when the door locks are locked. If the voltage is not near 0 volts or is erratic, try grounding the Blue/White wire. Verify the door lock control unit stops trying to lock the doors. If grounding the Blue/White wire corrects the problem, verify the Black ground wire at the actuator is good. Replace the drivers power door lock actuator as necessary.

[Lorrin Barth]

That is one of the clearest write ups I’ve ever read.

[Author]

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