Principles of Operation

PRINCIPLES OF OPERATION

Power Window Operation
The power window system operates under the control of the accessory delay relay. The smart junction block (SJB) grounds the relay coil to provide power to the power window system.

The power window system can be operated from the LH front window control switch or from the window control switches located on each door panel. The LH front window control switch has 2 modes of operation for the LH front power window, manual and auto. All other windows operate in the manual mode only.

MANUAL mode moves the window downward until the switch is released. The LH front power window will operate in the manual mode when the LH front window control switch is pressed to the 1st detent position.

AUTO mode provides the one-touch down (OTD) feature for the LH front power window. The OTD function allows the LH front power window to be completely lowered when the LH front window control switch is pressed to the 2nd detent position and then released. OTD is controlled by the LH front window control switch.

The power window system will only operate if:
- the ignition is in the RUN or ACC position.
- the accessory delay feature is in the active mode.

Heated Rear Window
The heated rear window is controlled by the smart junction box (SJB) and the manual climate control assembly or dual automatic temperature control (DATC) module. The heated rear window switch is integral to the manual climate control assembly or DATC module.

For vehicles equipped with DATC, when the heated rear window switch is pressed to the ON position, the DATC module sends a message through the controller area network (CAN) to the SJB. When the SJB receives the heated rear window ON message, the SJB starts a 10-minute timing function, and grounds the heated rear window relay coil control circuit, which is hardwired to the SJB. When the heated rear window relay is active, battery voltage is sent to the heated rear window grid through circuit CRD06 (BN/YE). The heated rear window grid is grounded through circuit GD150 (BK/WH).

For vehicles equipped with manual climate control assemblies, when the heated rear window switch is pressed to the ON position, the EMTC sends a ground signal to the SJB through circuit CRD09 (DB/GY). When the SJB receives a ground signal through CRD09 (DB/GY), the SJB grounds the heated rear window relay coil control circuit, which is hardwired to the SJB. When the heated rear window relay is active, battery voltage is sent to the heated rear window grid through circuit CRD06 (BN/YE). The heated rear window grid is grounded through circuit GD150 (BK/WH).

The SJB will deactivate the heated rear window relay when any of the following conditions have been met:
- The rear window defrost switch is pressed when the feature is active.
- The ignition switch state is changed from RUN to OFF/LOCK.
- The SJB 10-minute timing function completes.