Trouble Shooting

WARNING: This page is about a different car, the 1998 Oldsmobile Aurora and 1998 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Body Control Module (BCM) may also be referred to as Multifunction Alarm, Lock & Lighting (MALL) module.

Ensure BCM is operating properly. To diagnose BCM, refer to BODY CONTROL MODULE article.
Check PWR DR LK and INTR LP fuse located in right rear junction block, under rear seat cushion.
If one door actuator locks and unlocks, but other door lock actuators do not function properly, check wiring to suspect actuator. If wiring is okay, replace suspect actuator.
If actuator's internal circuit breaker trips, circuit breaker will not reset until voltage is removed from actuator.
Before replacing component, check for poor terminal contact at component and harness connectors.
Ensure aftermarket electronic equipments are properly installed as not to affect integrity of other systems.
Check for broken wire inside insulation causing intermittent malfunction. Check for voltage drop with system operating (under load).