B3147

Uplevel Door Locks:

DTC B3147 RF Unlock Switch Circuit Low (Part 1 Of 2):

DTC B3147 RF Unlock Switch Circuit Low (Part 2 Of 2):

CIRCUIT DESCRIPTION
The Body Control Module (BCM) monitors and supplies an output voltage on circuit 194. When the BCM receives a UNLOCK command from the remote control door lock receiver the BCM supplies voltage on circuit 194 to UNLOCK the passenger door.

CONDITIONS FOR SETTING THE DTC
^ When the BCM receives a 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 UNLOCK system will not UNLOCK the passenger door from the key fob.
^ The door lock switches will not LOCK or UNLOCK the doors.

CONDITIONS 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 diagnose the first DTC listed on the scan tool.
^ The scan tool must display DTC B3147 as a current code before performing diagnostics.
^ Perform a visual check for loose or poor connections at all related components.

TEST DESCRIPTION
Step number(s) below refer to the same step number(s) in the Diagnostic Table.
2. This step determines if the UNLOCK relay is shorted.
3. This step determines if the LF door lock switch is shorted to ground.
4. This step determines if the RF door lock switch is shorted to ground.
5. This step determines if the circuit 194 is shorted to ground.