Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

The CHECK WASHER FLUID message is controlled by the Electronic Lighting Control Module using an input from the washer fluid level switch. The washer fluid level signal circuit is supplied voltage through a resistor then monitored within the Electronic Lighting Control Module. The washer fluid level switch is normally closed so the Electronic Lighting Control Module detects ignition voltage on the washer fluid level signal circuit whenever the washer fluid level is 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 opens. When the washer fluid level switch is opened, the washer fluid level signal circuit voltage is pulled high, and the instrument cluster displays the CHECK WASHER FLUID message on the driver information center. In order to prevent the CHECK WASHER FLUID message from being displayed while sloshing is occurring in the washer fluid container, the instrument cluster is programed with up to a 1 min delay before changing states of the CHECK WASHER FLUID message during an ignition cycle.