• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Deadbolt Lock Control | 1 | 1 | 1 | -- |
Deadbolt Unlock Control | 1 | 1 | 1 | -- |
1. Power Door Locks Deadbolt Malfunction |
Export vehicles may be equipped with the deadbolt feature, which includes a reversible deadbolt motor contained within each door latch assembly. Each deadbolt motor is wired to the driver door module (DDM) through 2 circuits; the deadbolt lock control circuit and the deadbolt unlock control circuit. To deadbolt a door, the body control module (BCM) locks the door by momentarily applying voltage to the door latch motor control circuit. The remote control door lock receiver (RCDLR) applies ground to the door latch enable control circuit to complete the circuit to the door latch motor. To complete the deadbolting, the DDM momentarily applies voltage to the deadbolt lock control circuit and ground to the deadbolt unlock control circuit. If the content theft feature is armed at the same time, the interior door lock switches will not operate the locks.
To undeadbolt the door, the DDM reverses the polarity, applying battery voltage to the deadbolt unlock control circuit, and ground to the deadbolt lock control circuit.
Door Lock/Indicator Schematics
Power Door Locks Description and Operation
Control Module References for scan tool information
Ignition ON, command the Door Deadbolt Lock/Unlock ON and OFF with a scan tool. The deadbolts should perform the LOCK and UNLOCK functions.
• | Driver door latch control circuit terminal 1 and control circuit terminal 2 |
• | Passenger door latch control circuit terminal 6 and control circuit terminal 7 |
⇒ | If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the DDM. |
⇒ | If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the DDM. |
• | Driver door latch control terminal 1 |
• | Passenger door latch control terminal 6 |
• | Driver door latch control terminal 2 |
• | Passenger door latch control terminal 7 |
⇒ | If the function does not perform as specified, replace the door latch. |
⇒ | If the function does not perform as specified, replace the door latch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for DDM replacement, setup, and programming |