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Depends which doors...

Commonly, the front door lock units suffer broken wires in the door-to-body loom. Remove the door lock switch and make sure power is being applied to all three terminals on operation and that the relay is clicking. Remove the door panel, locate the two wires to the lock solenoid and confirm voltage present on switch operation. If you have voltage when working the switch then the solenoid is bad - no voltage then check the continuity of the wiring between door and body.

Rear doors - same principle but it's usually the solenoids that go bad first.

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14y ago
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Q: How would you go about troubleshooting two out of the four power door locks that do not work on a 1988 Chevy Suburban?
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