B3138

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

For a full page schematic, refer to Door Lock/Indicator Schematics.

CIRCUIT DESCRIPTION
The body control module (BCM) monitors and supplies an output voltage on the door lock control circuit to lock the doors. When the BCM receives a lock command from the remote control door lock receiver or an automatic door lock function has been activated, the BCM supplies voltage on the door lock control circuit to lock the doors.

CONDITIONS FOR RUNNING THE DTC
The system voltage must be between 9.0 and 16.0 volts.

CONDITIONS FOR SETTING THE DTC
^ When the door lock control circuit is shorted to battery voltage.
^ The above condition must be met for 904 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The power door lock system will not UNLOCK the doors from the keyless entry transmitter.
^ The automatic door locks will not operate.
^ The door lock switches will not UNLOCK the doors.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC will clear after the next fault free ignition cycle.
^ A history DTC will clear after 100 consecutive ignition cycles without a fault present.

DIAGNOSTIC AIDS
^ Always begin diagnosis with the first DTC listed on the scan tool.
^ Perform a visual inspection for loose or poor connections at all related components
^ A short to battery voltage in the door lock control circuit can be caused by a faulty door lock switch.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. Listen for an audible click when the door lock relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Verifies that the Body Control Module (BCM) is providing voltage to the door lock relay.
4. Tests for an open in the ground circuit to the door lock relay.
5. Tests if voltage is constantly being applied to the door lock relay.
12. After replacement of the BCM you must calibrate the new module for proper operation.