B3157

DTC B3142, B3147, B3152, or B3157

Circuit Description

The switch that failed and generated the DTC is wired to either the driver door switch assembly (DDSA), passenger front door module (PFDM), left rear door module (LRDM), or right rear door module (RRDM). When a door lock switch is activated to the lock or unlock function, the DDSA, PFDM, LRDM, or RRDM receives the switch input and sends the information on, via the serial data class 2 communications line, to the rear integration module (RIM), which is the master of all lock operations. If the RIM determines that the message is a valid request and conditions are correct for a door lock function to occur, it sends its OK back to all the door modules to lock or unlock the doors. Each door module supplies power and ground to its associated lock actuator to lock or unlock the associated door.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC B3142 Unlock Switch Circuit Low
* DTC B3147 Right Front/Passenger Unlock Switch Circuit Low
* DTC B3152 Left Front/Driver Lock Switch Circuit Low
* DTC B3157 Right Front Lock Switch Circuit Low

Conditions for Running the DTC

The DDSA, PFDM, LRDM, or RRDM must be powered and can not have B1327 Battery Voltage Low or B1328 Battery Voltage High set for this DTC to set.

Conditions for Setting the DTC

If the DDSA, PFDM, LRDM, or RRDM detects that its associated switch is closed to a lock or unlock function for more than 30 continuous seconds, it sets the DTC.

Action Taken When the DTC Sets

The DDSA, PFDM, LRDM, or RRDM ignores inputs from the associated switch until the switch state changes.

Conditions for Clearing the MIL/DTC

The current DTC will clear when the DDSA, PFDM, LRDM, or RRDM no longer detects the failure.

Diagnostic Aids

A sticking or binding switch can cause this DTC to set. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

Test Description

Step 1 - Step 10:

The number below refers to the step number on the diagnostic table.
2. This step inspects the existing state of the lock switch by using the current state of the input parameter.