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. Check Fuse 11 by operating interior lights.
^ Refer to Audible Warning Device for rear door jamb switch diagnosis. Audible Warning Device

NOTE:
^ Automatic Door Lock feature is controlled by the Multi-function Alarm Module. Verify that all chime alarms operate (refer Audible Warning Device) and that the Illuminated entry (refer Illuminated entry) features operate before diagnosing any Automatic Door Lock problems. Audible Warning Device Testing and Inspection
^ Automatic Door Unlock feature is controlled by the Door Unlock Module. This function can be defeated by removing Fuse 17. Make sure Fuse 17 is installed when checking Automatic Door Unlock Feature.
^ Refer to Antitheft and Alarm Module for Multi-function Alarm Module access. Antitheft and Alarm Systems
^ Refer to System Diagnosis. System Diagnosis
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove "GOOD" in a continuity/voltage check (refer to "General Troubleshooting Procedures,"). Diagnostic Aids
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (refer to "General Troubleshooting Procedures,").