Heated Windshield

The heated windshield system only operates when the engine is running. When the heated windshield switch is activated, the HVAC module sends the request message to the BCM. The BCM then sends the request through a LIN to the BJB, activating the heated windshield relay (integral to the BJB). When the heated windshield relay is activated, the left and right windshield grids are energized. The heated windshield system may also be automatically activated as an extra load for accelerated engine warm-up, however the heated windshield status LED remains off unless the heated windshield switch is activated.

The BCM deactivates the heated windshield relay when one of these conditions is met:

• The heated windshield switch is pressed when the feature is active.
• Ignition state is changed from ON to OFF.
• A predetermined timer completes.
• Battery voltage has dropped below a specified threshold (load management strategy).