The car's wiper wash/delay switch circuit isn't communicating properly with the control module—like a broken light switch that doesn't tell the wall if the lights should be on or off. The ECU can't detect whether you're activating the wipers or wash function, so it can't command those systems to work.

The ECU monitors voltage signals from the wiper/wash switch circuit to detect user input for wipers, washers, and delay modes. It expects specific voltage levels corresponding to each switch position. An open circuit, short, or resistance outside normal range triggers the fault.

Voltage & Parameter Thresholds