Fords have bad wiper motors, I've done three in my town car so far. Bought mine at Autozone for the liftime warratee, paid off so far! Test for power at the motor connector.
Front wiper motor is controlled by wiper/washer (multifunction) switch, which supplies a specific resistance value to the Generic Electronic Module (GEM). The GEM supplies a ground to wiper run/park and high/low relay coils, activating relays with voltage supplied by fuse No. 11 (30-amp) in Central Junction Box (CJB) through the ignition switch when in RUN/ACCY position. When activated, wiper run/park relay switches supply voltage to wiper high/low relay.
Depending on switch position, the wiper high/low relay supplies voltage to either high speed or low speed input of wiper motor. When wiper motor is activated, the run/park switch (integral with wiper motor) provides voltage to GEM which in turn removes ground to run/park relay coil, deactivating it. The wiper motor continues to operate through voltage supplied to run/park switch and run/park relay. When wiper motor returns to park position, run/park switch grounds GEM input and GEM removes ground from wiper high/low relay coil, deactivating high/low relay and wiper motor. The GEM continues this cycle until wiper/washer switch position is changed.
The GEM further controls the front wipers and allows for intermittent speed through completion of a time-out cycle and speed-dependent operation by shortening delay at higher speeds, allowing for faster operation. The front wipers will operate in speed-dependent mode (from 10-65 MPH) at all times, unless wiper/washer switch is in the INT 1 position. The rear wiper motor is also controlled through the GEM in a similar manner, through rear wiper relay with voltage supplied by fuse No. 1 (20-amp) in Battery Junction Box (BJB). The front windshield and rear window washer is controlled by its respective wiper/washer switch through the GEM.
COMPONENT LOCATIONS COMPONENT LOCATIONS NOTE: This article includes coverage for Cab & Chassis. Component Location Battery Junction Box Left Side Of Engine Compartment, On Front Of Wheelwell Central Junction Box Lower Left Side Of Instrument Panel Generic Electronic Module Attached To Rear Of Central Junction Box Rear Washer Pump Relay In Battery Junction Box Rear Wiper Relay In Battery Junction Box Front Wiper Motor Top Left Side Of Firewall Rear Wiper Motor In Center Of Tailgate Front Washer Pump Relay In Battery Junction Box Rear Washer Pump Relay In Battery Junction Box
Saturday, July 26th, 2008 AT 5:09 AM