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The window lift system will only operate when the ignition switch is in position II (ignition on) and features anti-trap functionality. The rear window lift system (if fitted) comprises a handle and manually operated door window regulator in each rear door. Heated Windshield and Rear Window The heated windshield contains a single heating element which is powered for up to a maximum of 8 minutes when selected. The system is only operational when the engine is running. The heated rear window also contains a single heating element and will operate with the ignition switch in position II (ignition on). The heated rear window isn't constrained to an operational time limit. PRINCIPLES OF OPERATION Window Lift The window lift relay coil is energized by an ignition feed from the central junction box (CJB). The energized relay provides a battery voltage feed to the left-hand (LH) and right-hand (RH) window lift switches. Each window lift switch has 2 connections with its respective window lift motor; feed and return. These lines switch depending on the direction of travel requested using the switch. In each case, the motor is provided a ground path through its switch. Each motor has thermal cut-out protection. If the window reaches the top or bottom of its travel, or hits an obstruction, the thermal cut-out will sense the increased load on the motor and cut the power supply to the motor brush contacts. Thermal cut-out time is between 3.5 to 5 seconds, with a re-start time of between 1 to 10 seconds. Heated Windshield Operation of the heated windshield is controlled by the heated windshield module. The heated windshield module is located behind the instrument cluster and receives an engine running signal from the engine control module (ECM). The heated windshield module also monitors the condition of the heated windshield switch. If the switch is pressed, a ground path is created. If both these signals are in place, the heated windshield module provides a feed to the heated windshield element until either; the switch is pressed a second time 8 minutes elapses or the engine is stopped. Heated Rear Window The heated rear window switch is located in the center console and is provided an ignition feed from the CJB. When the switch is pressed, a feed is provided to the heated rear window relay coil. The now energized heated rear window relay provides a battery voltage feed from the CJB to the heated rear window element. |