B3172

DTC B3172

CIRCUIT DESCRIPTION
The window switch that failed and generated this diagnostic trouble code (DTC) is mounted on one of the passenger doors and wired to the associated passenger door module. When the switch is activated, the passenger door module examines the switch signal and determines if conditions are correct for that window function to occur. If conditions are correct, the passenger door module then supplies power and ground to the associated window motor and circuits to operate the window. The window motors are reversible. When an Up movement is requested, the module applies battery positive voltage to the Up circuit and ground to the Down circuit. When a Down movement is requested, the module reverses the polarity, and applies battery positive voltage to the Down circuit, and ground to the Up circuit.

CONDITIONS FOR RUNNING THE DTC
The passenger door module must be powered and can not have B1327-Battery Voltage Low or B1328-Battery Voltage High set for one of these DTCs to set.

CONDITIONS FOR SETTING THE DTC
If the driver door module (DDM) receives a message from a passenger door module indicating that a window switch is closed for more than 15 continuous seconds, the DDM sets the DTC.

ACTION TAKEN WHEN THE DTC SETS
The action taken depends on which switch contacts are closed:
- If an up switch contact is closed for more than 15 seconds, both UP and DOWN movements are disabled until the UP switch contact is no longer closed, or, the power mode changes from OFF to RUN.
- If a down switch contact is closed for more than 15 seconds, the DOWN movement only is disabled until the DOWN switch contact is no longer closed, or, the power mode changes from OFF to RUN. UP movements are permitted regardless of the DOWN switch state.
- If an express switch contact is closed for more than 15 seconds, the Express movement is disabled until the express switch contact is no longer closed.

CONDITIONS FOR CLEARING THE DTC
The DDM clears this current DTC when the switch message is not received, or when the module power mode changes from OFF to RUN.

TEST DESCRIPTION

Step 1 - 4:

Step 5 - 10:

The numbers below refer to the step numbers on the diagnostic table.
2. Checks the module input state using the normal input status.
3. Checks to see that the input is seen by the module.
4. Checks to see that the signal lines to the module are open with the switch removed.
5. Checks to see if the signal circuits are shorted to ground.