B2223

DTC B2223 RF Door Lock/Unlock Switch Stuck Unlock:

CIRCUIT DESCRIPTION
The RH front power door lock switch feeds switch signals to the Passenger Door Module (PDM) over CKT 244 (LT BLU) and CKT 245 (DK BLU). The PDM converts the switch inputs to serial digital data and broadcasts the message out on the simple bus interface. The simple bus interface, CKT 217 (LT BLU), provides a communications path from the PDM to the Driver's Door Module (DDM). The DDM contains the following two types of software:
^ Switch message decoding software
^ Simple bus interface diagnostic software

The software enables the DDM to relay messages to the PDM as well as test the interface between the two components.

CONDITIONS FOR SETTING THE DTC
^ If either switch inputs for LOCK or UNLOCK remain closed for 30 seconds continuously, DTC B2223 sets.
^ DTCs B1982 (Battery Voltage High) and B1983 (Battery Voltage Low) must not be current or the diagnostic will not run.

ACTION TAKEN WHEN THE DTC SETS
The switch actuation will be ignored until the switch leaves the low state change of the lock switch input. The door lock levers and key locks will still function normally.

CONDITIONS FOR CLEARING THE MIL/DTC
^ This DTC will be set from current to history when the UNLOCK input cycles off or when the power mode changes from OFF to RUN.
^ The history DTC will clear after 50 ignition cycles.
^ Use a scan tool in order to clear the history DTC.

DIAGNOSTIC AIDS
The scan tool can be selected to monitor DDM inputs and set outputs as well as view DTCs. The scan tool may also be used to select Remote Function Actuator (RFA) inputs, outputs and options.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
1. Perform the Power Door Diagnostic System Check prior to Diagnosing DTC B2223
2. This step checks for the RH Front Power Door Lock Switch failing mechanically
3. This test step checks for inputs to the passenger door module
4. This test step tests the RH Front Power Door Lock Switch
7. This test step tests circuit 245 for a short to ground