D3 - Check Mode Select Signal at Wiper Switch

^ Disconnect harness from the wiper switch.

^ Resistance between terminals for circuits 993 (BR/W) and 589 (O).

^ Is resistance between 10.5k ohms and 12.0k ohms?

YES -- Check for open wire between switch and wiper control module. Service as required.

NO -- Check for damaged switch. Service as required.