B3142

DTC B3142

CIRCUIT DESCRIPTION
The switch that failed and generated this diagnostic trouble code (DTC) is wired to either the driver door switch assembly (DDSA) or the passenger door module (PDM). The DDSA or the PDM includes the switch state in the message it sends to the driver door module (DDM) via the power door serial data circuit. The DDM sends the switch message to the rear integration module (RIM), which is the master of all lock operations, as a class 2 message. The RIM checks all conditions and if all conditions are correct, sends its OK to the DDM. When the OK message is received, the DDM sends the required signal to all other door modules via the power door serial data message system.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
- DTC B3142 LF Unlock Switch Circuit Low
- DTC B3147 Passenger Unlock Switch Circuit Low
- DTC B3152 LF Lock Switch Circuit Low
- DTC B3157 Passenger Lock Switch Circuit Low

CONDITIONS FOR RUNNING THE DTC
The DDM and PDM must be powered, in communications with each other and cannot have B1327 Battery Voltage Low or B1328 Battery Voltage High set for these DTCs to set.

CONDITIONS FOR SETTING THE DTC
If the DDM receives the message that either a passenger door lock switch circuit is closed for more than 30 continuous seconds or a DDSA lock switch circuit is closed for more than 255 seconds (4.25 minutes), the DDM sets a lock switch circuit DTC.

ACTION TAKEN WHEN THE DTC SETS
The DDM ignores any message from the lock switch designated by the DTC and prevents lock movement from the switch. The DDM will respond to other lock switch messages.

CONDITIONS FOR CLEARING THE DTC
The DDM clears this current DTC when the switch message is no longer received and stores a history DTC. The history DTC will clear either after 50 OFF/ON ignition switch cycles without a repeated failure or in response to a scan tool command.

TEST DESCRIPTION

Steps 1-10:

The numbers below refer to the step numbers on the diagnostic table.
2. This step checks the module input state using the normal input status.
3. This step checks to see that the input is seen by the module.
4. This step checks to see that the signal circuits to the module are open with the switch removed.
5. This step determines that the signal circuits are not shorted.