Power Window System: Description

A permanent-magnet motor operates each power window. Each motor raises and lowers window when voltage and ground is supplied by appropriate door module. Motor direction depends on polarity of supply voltage. The following components are used to control the power windows:

• Driver Door Module (DDM)
• Passenger Door Module (PDM)
• Left Rear Door Module (LRDM)
• Right Rear Door Module (RRDM)
• Driver Door Switch Assembly (DDSA)
• Right Front Power Window Switch
• Left & Right Side Rear Power Window Switches
• Left & Right Side Front Power Window Motor
• Left & Right Side Rear Power Window Motor
• PWR WDO Circuit Breaker (30-Amp)

All modules communicate with each other on Simple Bus Interface (SBI) line. DDM is capable of communication over both SBI and Class-2 data line. Each door module has its own battery positive voltage supply circuit to use for power window operation, but they are all fed by the same PWR WDO circuit breaker (30-amp) located in rear fuse block. Each door module also has a separate ground circuit to use for power window operation. These circuits are in the same dedicated connector as the window motor drive circuits of each door module.

Each door module supplies battery positive voltage and ground, through the window motor drive circuits, to its associated window motor. The window motors are reversible. Direction of window movement depends on which circuit battery voltage is applied, and which circuit ground is applied. To move window up, the module applies battery voltage to motor up circuit, and ground to motor down circuit. To move window down, the module reverses polarity and supplies power and ground to the opposite circuits.

Front door windows have an express down feature, allowing the front windows to be fully opened by momentarily pressing appropriate window switch to second detent of DOWN position.

The window lockout feature incorporates a switch built into the Driver Door Switch Assembly (DDSA). The lockout function can be programmed to prevent both rear windows from being operated from their locally mounted switches. This feature can also prevent all passenger windows from being operated from their locally mounted switches. When lockout switch is pressed momentarily, the LED indicator is illuminated and DDSA receives the switch signal. DDSA then sends a message over power door serial data line to Driver Door Module (DDM) indicating that the switch is active. The DDM then sends a message over the power door serial data line to both rear door modules to prohibit rear window operation from rear door window switches. It also sends the message to all of the passenger doors to prohibit all passenger window operation from their respective switches. When lockout function has been activated, windows can still be operated from driver door by using window switches built into the DDSA.