B3377

CIRCUIT DESCRIPTION
The switch that failed and generated this Diagnostic Trouble Code (DTC) is one of the window switches that is a built in part of the Driver Door Switch Assembly (DDSA). There are no external circuits. The DDSA contains a microprocessor which takes the signal generated by the switch and assigns a digital message to it. The DDSA then sends this message over the Class 2 Serial Data line to the appropriate door module, (Driver Door Module (DDM), Passenger Front Door Module (PDM), Left Rear Door Module (LRDM), or Right Rear Door Module (RRDM)). The door module controlling the window operation requested examines the information to determine if conditions are correct for the operation to occur. If conditions are correct, the door module controlling the window then provides power and ground to its associated window motor and circuits to move 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. For a Down movement, 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 DDSA must be powered and must not have DTCs B1327-Battery Low Voltage or B1328-Battery High Voltage set for this DTC to set.

CONDITIONS FOR SETTING THE DTC
If the DDSA determines that one of its built in window switches is closed for more than 15 continuous seconds, it sets the DTC.

ACTION TAKEN WHEN THE DTC SETS
The action taken depends on which switch contacts are closed:
^ If a DDSA UP window switch is closed for more than 15 seconds, both UP and DOWN signals from that switch will be ignored until the input is no longer detected, or the ignition is cycled from Off to Run.
^ If a DDSA DOWN window switch is closed for more than 15 seconds, DOWN signals from that switch will be ignored until the input is no longer detected, or the ignition is cycled from Off to Run. The window UP function from that switch will still be operational.
^ If a DDSA Express window switch is closed for more than 15 seconds, express signals from that switch will be ignored until the DDSA no longer detects the input.
^ All windows will operate normally from their respective passenger door window switch.

CONDITIONS FOR CLEARING THE DTC
The DDSA clears the current DTC when it no longer detects a closed window switch, or the ignition is cycled from Off to Run.

DIAGNOSTIC AIDS
An intermittently sticking DDSA window switch may set the DTC. If the current DTC sets intermittently, refer to Testing for Electrical Intermittents.

TEST DESCRIPTION

Steps 1-6:

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.