B3157

Diagnostic Chart:

Refer to:
^ Door Lock Schematics: Left Midd Door Power Door Lock
^ Door Locks Schematics: LH Rear Door Power Door Lock W/O B9Q
^ Door Lock Schematics: Passenger Front Door Power Door Lock
^ Door Lock Schematics: Passenger Front Door Power Door Locks (W/ B9Q)
^ Door Locks Schematics: Right Midd Door Power Door Lock (W/ V4U)
^ Door Locks Schematics: RH Rear Door Power Door Lock (W/O B9Q)

CIRCUIT DESCRIPTION
The switch that failed and generated this diagnostic trouble code (DTC) is one of the switches wired to the passenger front door module (PFDM), left rear door module (LRDM), or right rear door module (RRDM) and mounted locally, one in each passenger door. The PFDM, LRDM, or RRDM each contain a microprocessor which takes the signal generated by its switch and assigns a digital message to it. The PFDM, LRDM, or RRDM then sends this message over the Serial Data Class 2 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, it sends its OK back, via the Class 2 line to the door modules. Each door module then supplies power and ground to its associated lock actuator to Lock the doors.

CONDITIONS FOR RUNNING THE DTC
The 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 PFDM, LRDM or RRDM detects that a switch is closed for more than 30 continuous Seconds it sets this DTC.

ACTION TAKEN WHEN DTC SETS
The PFDM, LRDM, and RRDM ignore inputs from this switch and prevent the doors from locking until the input is no longer received.

CONDITIONS FOR CLEARING THE MIL/DTC
The PFDM, LRDM, or RRDM clears this DTC when the switch signal is not received for a time period of 600 milliseconds, or, when the ignition is cycled from OFF to RUN.

DIAGNOSTIC AIDS
A sticking or binding switch can cause this DTC to set.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. Checks the existing state of the applicable passenger door lock switch by using the current state of the input parameter.

For a description of the RPO Code(s) shown in this image/article refer to the RPO Code List found at Vehicle/Application ID RPO Codes