Circuit Description
Power WindowsHow the Circuit Works
CAUTION: Disconnect the window switch connector before you start. You could unintentionally switch the window to "automatic down" while working in the driver's or front passenger's door with the power on. The moving glass could injure your arms, hands, or fingers.
The power windows system is a multiplex controlled system. The control units that operate within the power window system are:
- Driver's MPCS unit
- Front Passenger's MPCS unit
- MICU
The power window master switch, left rear power window switch, and right rear power window switch have control blocks within the switches to communicate the multiplex signals. The front passenger's power window switch does not have a control block within the switch and uses the front passenger's MPCS unit to communicate the passenger's window request.
Each motor is protected by a non-serviceable built- in circuit breaker. The circuit breaker will reset automatically as it cools.
Power Supply
Battery voltage is supplied at all times through fuse 7 (in the driver's under-dash fuse/relay box) to the driver's MPCS unit, the front passenger's MPCS unit and to the MICU.
Battery voltage is supplied at all times through fuse 27 (in the driver's under-dash fuse/relay box) to the driver's MPCS unit.
Battery voltage is supplied with the ignition switch in the ON (II) or START (III) positions through fuse 21 (in the driver's under-dash fuse/relay box) to the driver's MPCS unit and to the MICU.
Driver's Window
When the driver's switch of the power window master switch is pushed to DOWN or pulled to UP, the signal for down or up is input to the driver's MPCS unit. The driver's MPCS unit directly operates the window motor. When the driver's switch is pushed to AUTO DOWN or pulled to AUTO UP, the signal for auto down or auto up is input to the driver's MPCS unit.
As the window moves up or down, the pulser in the driver's power window motor sends pulsing signals to the driver's MPCS unit. When the window reaches the fully down or fully up position, the pulsing signal stops and the driver's MPCS unit removes power and ground from the driver's power window motor.
If something obstructs the window during the AUTO UP operation, the driver's MPCS unit will detect "no pulses" from the pulser. For safety reasons, the driver's MPCS unit will immediately make the driver's power window motor stop and reverse.
All Passenger Windows
All windows can be opened and closed by the power window master switch. The passenger windows are disabled when the main switch is OFF. The driver's power window motor remains operable when the main switch is OFF.
Front Passenger's Window
When the front passenger's switch of the front passenger's power window switch is pushed to DOWN or pulled to UP, the signal for down or up is input to the front passenger's MPCS unit. The front passenger's MPCS unit directly operates the window motor. When the passenger's switch is pushed to AUTO DOWN or pulled to AUTO UP, the signal for auto down or auto up is input to the front passengers MPCS unit.
As the window moves up or down, the pulser in the passenger's power window motor sends pulsing signals to the front passenger's MPCS unit. When the window reaches the fully down or fully up position, the pulsing signal stops and the front passenger's MPCS unit removes power and ground from the passenger's power window motor.
If something obstructs the window during the AUTO UP operation, the front passenger's MPCS unit will detect "no pulses" from the pulser. For safety reasons, the front passenger's MPCS unit will immediately make the front passenger's power window motor stop and reverse.
Left Rear Window
When the left rear power window switch is pushed to DOWN or pulled to UP, the signal for down or up is input to the control block within the left rear switch. The control block within the switch directly operates the left rear power window motor. When the switch is pushed to AUTO DOWN or pulled to AUTO UP, the signal for auto down or auto up is input to the control block in the switch.
As the left rear window moves up or down, the pulser in the left rear power window motor sends pulsing signals to the control block. When the window reaches the fully down or fully up position, the pulsing signal stops and the control block removes power and ground from the left rear power window motor.
If something obstructs the window during the AUTO UP operation, the control block will detect "no pulses" from the pulser. For safety reasons, the control block will immediately make the left rear power window motor stop and reverse.
Right Rear Window
When the right rear power window switch is pushed to DOWN or pulled to UP, the signal for down or up is input to the control block within the right rear switch. The control block within the switch directly operates the right rear power window motor. When the switch is pushed to AUTO DOWN or pulled to AUTO UP, the signal for auto down or auto up is input to the control block in the switch.
As the right rear window moves up or down, the pulser in the right rear power window motor sends pulsing signals to the control block. When the window reaches the fully down or fully up position, the pulsing signal stops and the control block removes power and ground from the right rear power window motor.
If something obstructs the window during the AUTO UP operation, the control block will detect "no pulses" from the pulser. For safety reasons, the control block will immediately make the right rear power window motor stop and reverse.
Remote Transmitter Operation
The windows can be opened with the remote transmitter. By pressing the UNLOCK button twice and then holding it, all four windows and the moon- roof will open. The windows and moonroof cannot be closed with the remote transmitter.
Built-in Key Operation
The windows can be opened and closed with the built-in key. By inserting the key into the driver's door key cylinder switch and turning the key clockwise twice and then holding it, all four windows and the moonroof will open. By inserting the key into the driver's door key cylinder switch and turning the key counterclockwise twice and then holding it, all four windows and the moonroof will close.