Troubleshooting Hints

Perform before beginning System Diagnosis
1. Check Inline Fuse A by operating the Horn.
2. Check for mechanical binds in the Door Lock System.
3. If one or more of the Door Lock Motors do not operate properly but the other Door Lock Motors function normally, check the wiring to the motors. If the wiring is OK, replace the motor.
4. If Inline Fuse A blows when a power Door Lock Switch is activated, check CKT 194, CKT 195, Door Unlock Module and Multi-function Alarm Module for a short to ground.
5. If a motor's internal circuit breaker trips, it will not reset until voltage is removed from the motor.
6. If the Circuit Breaker 15 trips when a Power Door Lock Switch is activated, check CKT 295 and CKT 294 for a short to ground.
7. If Electronic PRNDL does not operate, Refer to 8A-85
8. If LH Front Door Lock is the only inoperative lock, and the vehicle is equipped with the Keyless Entry Feature, see page 8a-132 for diagnosis.

NOTE:
^ Automatic Door Lock feature is controlled by the Multi-function Alarm Module. Verify that all chime alarms operate (refer to Instrument Panel Gages and Warning Devices) and that the Illuminated Entry feature operates before diagnosing any Automatic Door Lock problems. Instrument Panel, Gauges and Warning Indicators
^ Audible Warning Device for Multi-function Alarm Module access.
^ Refer to Doors for door access. Doors
^ Refer to System Diagnosis. System Diagnosis
^ Check for a broken (or palatially broken) wire inside of the insulation which could cause system failure but prove "GOOD" in a continuity/voltage check (see "Diagnostic Aids/General Troubleshooting Procedures,") Diagnostic Aids
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (see "Diagnostic Aids/General Troubleshooting Procedures,") Diagnostic Aids