B3147

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 CKT 194. When the BCM receives an unlock command from the remote control door lock receiver the BCM supplies voltage on circuit 194 to unlock the passenger door.

CONDITIONS FOR RUNNING THE DTC
^ The system voltage must be between 9.0 and 16.0 volts.
^ The key fob and or door locks must be activated to lock/unlock the doors.

CONDITIONS FOR SETTING THE DTC
^ When the BCM receives an unlock signal to unlock the passenger door from the remote control door lock receiver module and circuit 194 is shorted to ground.
^ The system voltage must be between 9.0 volts and 16.0 volts.
^ The above conditions must be met for 0.25 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The door lock system will not unlock the passenger door from the key fob.
^ The door lock switches will not lock or unlock the doors.

CONDITION FOR CLEARING THE MIL/DTC
^ A current DTC will clear after the next fault free passenger door unlock cycle.
^ A history DTC will clear after 100 consecutive ignition cycles without a fault present.
^ History and current DTC's) can be cleared using a scan tool.

DIAGNOSTIC AIDS
^ Always begin diagnosis with the first DTC listed on the scan tool.
^ The scan tool must display DTC B3147 as a current code before performing these diagnostics.
^ Perform a visual check for loose or poor connections at all related components
^ Refer to Testing for Intermittent and Poor Connections

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.