B2220 DDM Driver Door Lock/Unlock Sw. Stuck

DTC DDM B2220 - Driver Door Lock/Unlock Switch Stuck:

CIRCUIT DESCRIPTION
The LH Front Power Door Lock switch feeds switch signals to the Driver Door Switch (DDS) over CKT 780 (RED/BLK) and CKT 781 (ORN/BLK). The DDS converts the switch inputs to serial digital data and broadcasts the message out on the Simple Bus Interface (SBI). The SBI, CKT 217 (LT BLU), provides a communications path from the DDS to the Drivers Door Module (DDM). The DDM contains both switch message decoding software and SBI diagnostic software. The software enables the DDM to accept messages from the Door Switch and check the interface between the two components.

CONDITIONS FOR SETTING THE DTC
^ If either the switch inputs for LOCK or UNLOCK remain closed for 30 continuous seconds, this Diagnostic Trouble Codes (DTC) will be set.
^ 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 manual door lock levers and key locks will still function normally.

CONDITIONS FOR CLEARING THE MIL/DTC
This code will clear automatically when the Switch becomes operational again.

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
This diagnostic runs at least once every 300 milliseconds. The diagnostic program resides in the DDM. A check of the DDS is made during each pass.