Windshield Wiper Control and Interval Timer

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

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

Front Windshield Wiper Control (with Speed Dependent Interval Wiper)
The 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. Except when the seven position switch is in interval 1, the speed dependent wipers will 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 105 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 300 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 300 ms (with the mode in the OFF position), the wiper system will provide one wipe at low speed with no wash.

Modes: OFF, Interval, LOW, HIGH, and WASH.

INTERVAL
For standard interval, the time between low-speed wipes will range from 1.5 to 20 seconds. These delays will shorten as vehicle speed increases up to 105 kph (65 mph). This feature is not active when the seven position switch is in interval 1 position.

HI
This is the fastest wiper speed with no dwell. It is selected when the multi-function switch is in the HI speed position. If the wash button is pressed for 0.3 to 10 seconds, the washer pump will energize until the wash button is released.

LO
This is the slowest wiper speed with no dwell. It is selected when the multi-function switch is in the LO speed position. If the wash button is pressed for 0.3 to 10 seconds, the washer pump will energize until the wash button is released.

WASH
If the wash button is pressed for 0.3 to 10 seconds, the washer pump will energize until the wash button is released.