Check Washer Fluid Message

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The Check Washer Fluid message is displayed by the radio when commanded by the dash integration module using an input from the washer fluid level switch. The washer fluid level switch signal circuit is supplied ignition voltage through a resistor then monitored within the dash integration module. The washer fluid level switch is normally open so the dash integration module detects ignition voltage on the washer fluid level signal circuit whenever the washer fluid level is not low. When the washer fluid reaches the point where the driver should be informed that the washer fluid is low, the washer fluid level switch closes. When the washer fluid level switch is closed the washer fluid level switch signal circuit voltage is pulled low, and the dash integration module commands the radio with a class 2 message over the serial data circuit to display the Check Washer Fluid message. In order to prevent the Check Washer Fluid message from being displayed while sloshing is occurring in the washer fluid container, the dash integration module is programed with a 1 minute delay before changing states of the Check Washer Fluid message during an ignition cycle.