Heating and Ventilation

Battery voltage is supplied to the blower motor resistor relay assembly connector C1 cavity G through CKT 540 (ORN) at all times. When the ignition switch is OFF or the blower switch is in any position except the HI position, there is no current to the coil side of the relay via CKT 52 (ORN) and remains de-energized. With the blower switch in the HI position the blower resistors are bypassed and voltage is supplied to the coil side of the relay via CKT 52 (ORN). This closes the contacts of the relay and supplies battery voltage from the Underhood Bussed Electrical Center (UBEC) (FRT HVAC) fuse to the blower motor. When the blower switch is in the LO or any medium position, the voltage is reduced through the respective resistors. The voltage reduction will limit the blower speed accordingly. The blower motor is permanently grounded via CKT 1050 (BLK) at G200. The blower motor resistor relay assembly is located next to the blower motor under the right side of the glove compartment.