Principles of Operation

PRINCIPLES OF OPERATION

Front Wiper and Washers
The multifunction switch controls the front wiper/washer portion and is hardwired to the smart junction box (SJB). When the switch is moved to the desired position, one or more of circuits 56 (DB/OG), 58 (WH), 61 (YE/RD) or 63 (RD) is grounded. This provides the necessary inputs for the SJB to control the run/park relay and the hi/low relay coils. In order to achieve high-speed operation, both relays are energized. The SJB will respond to the multifunction switch inputs only when the ignition lock cylinder is in the RUN or ACC. The front washer pump relay is hardwired to the SJB. The front washer switch portion of the multifunction switch grounds circuit 680 (LB/OG) which signals the SJB to energize the washer pump relay. The relay will then provide voltage to the windshield washer pump through circuit 941 (BK/WH). The washer pump motor then operates for up to 10 seconds.

Intermittent Wipers
The intermittent wiper speed control allows one of five delay periods between each wiper swipe. The SJB controls delay as selected inputs from the multifunction switch on circuits 56 (DB/OG), 58 (WH) or 63 (RD) are grounded. The SJB then activates the wiper run/park relay at a chosen time interval specified by the multifunction switch. The interval wiper modes are vehicle-speed sensitive. When the vehicle is traveling between the speeds of 15 km/h (9 mph) and 100 km/h (62 mph), a variable dwell time is used for the interval modes that depends on the speed of the vehicle. When the vehicle is traveling below 15 km/h (9 mph) or above 100 km/h (62 mph), a fixed dwell time is used for the interval modes.

Smart Junction Box (SJB)
The SJB is a single component that distributes voltage and controls the wipers and washers system.