Generic Electronic Module (GEM) Controlled Functions

There are five modes of operation for the front wipers: MIST, INTERVAL (speed-dependent), LOW, HIGH and WASH.

These modes are only active with the ignition switch in the RUN or ACCY position.

The Generic Electronic Module (GEM) responds to the windshield wiper control commands by interpreting inputs from the steering column seven-position delay/wash and four-position mode select switches. Speed-dependent wipers compensate for the extra moisture that accumulates on the windshield at higher speeds. At higher speeds, the speed-dependent feature shortens the delay between wipes when using the variable interval wipers. Delays will automatically adjust at speeds between 16 and 106 kph (10 and 65 mph).

The GEM relay drivers control three external relays: wiper high/low speed relay, dynamic brake-run relay, and the washer pump relay. When the washer switch is activated longer than 220 mS, the wash and wiper (low speed) functions are provided until the switch is released. The release of the switch will be followed by three low-speed wipes. If the switch is pressed between 100 mS and 220 mS (with the mode in the OFF position), the wiper system will provide one wipe at low speed with no wash.