System Description

CONTROLLED BY BODY CONTROL MODULE
The wiper system provides the driver with normal wipe (low and high speeds), intermittent wiper, wipe after wash, and pulse wipe functions. The driver selects the wiper function via a resistive multiplexed stalk switch mounted on the steering column. This value is then received by the BCM, which then determines the wiper motor output speed and frequency.

Pulse Wipe - When the wiper is in the off position and the driver presses the wash button for more than 62 msec but less than 1/2 second, 1 wipe cycle in low speed mode will be provided.

Wipe After Wash Mode - When the driver presses the wash button for over 1/2 second and then releases it, the wiper will continue to run for 2 additional wipe cycles.

OPERATION
The wiper system operates only when the ignition switch is On or in the Accessory position. The wiper motor has permanent magnet fields, and high and low speeds are determined by current flow to the appropriate set of brushes.

The intermittent wiper system in addition to HI and Low speeds, has a delay mode. The delay mode uses a variable resistor in the wiper switch and two relays. One relay turns the wipers On/Off and the other changes the speed.

The wiper system completes wipe cycle when the switch is turned Off and the blades park in lowest portion of wipe pattern.

CIRCUIT OPERATION
The windshield wiper system is powered by a 10 Amp fuse located in cavity 10 of the junction block. This fuse is HOT in the ACCESSORY and RUN positions only. Power for the fuse is supplied on the A31 circuit.

The A31 circuit originates at the ignition switch. Power for the A31 circuit is supplied by circuit A1 from the Power Distribution Center (PDC) and protected by a 20 Amp fuse located in cavity A.

The F13 circuit supplies the power from the fuse in the junction block to the wiper switch, coil side of the intermittent wiper relay, and the coil side of the HI/LOW Wiper relay Both of the relays used in the wiper system are located in the PDC.

The Body Control Module (BCM) controls all functions of the wiper system. This is accomplished through a multi-plexed input from the wiper switch to the BCM on circuit V52.