B3148

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 unlock control circuit. When the BCM receives an unlock command from the remote control door lock receiver or when the ignition key is removed after an automatic door lock function has been activated, the BCM supplies voltage on the door unlock control circuit to unlock the passenger door(s).

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 unlock control circuit is shorted to battery voltage.
^ The above condition must be met for 904 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The door lock system will not unlock the passenger door(s) from the keyless entry transmitter.
^ The door lock switches will not unlock the doors.
^ The automatic door locks will not operate.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC will clear immediately 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 check for loose or poor connections at all related components.
^ A short to battery voltage could 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 Unlock 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 unlock relay.
4. Tests for an open in the ground circuit to the door unlock relay.
5. Tests if voltage is constantly being applied to the door unlock relay.
12. After replacement of the BCM you must calibrate the new module for proper operation.