RESISTOR-BLOWER MOTOR
DESCRIPTION
The blower motor resistor is mounted to the HVAC housing on the passenger side of the vehicle. The blower motor resistor consists of a molded plastic mounting plate (1) with an integral wire connector receptacle (2). Concealed behind the mounting plate are resistors (3) located between a two-piece stamped steel base (4).
OPERATION
The blower motor resistor is connected to the vehicle electrical system through a dedicated take out and connector of the instrument panel wire harness. The blower motor resistor has three resistors, each of which will reduce the current flow through the blower motor to change the blower motor speed.
The blower motor control for the heating-A/C system directs the ground path for the blower motor through the correct resistor to obtain the selected speed. With the blower motor control in the lowest speed position, the ground path for the blower motor is applied through all of the resistors. Each higher speed selected with the blower motor control applies the blower motor ground path through fewer of the resistors, increasing the blower motor speed. When the blower motor control is in the highest speed position, the blower motor resistor is bypassed and the blower motor receives a direct path to ground.
The blower motor resistor cannot be adjusted or repaired and it must be replaced if found inoperative or damaged.
REMOVAL
WARNING: The blower motor resistor may get very hot during normal operation. If the blower motor was turned on prior to servicing the blower motor resistor, wait five minutes to allow the blower motor resistors to cool before performing diagnosis or service. Failure to take this precaution can result in possible personal injury.
CAUTION: Do not operate the blower motor with the blower motor resistor removed from the circuit. Failure to take this precaution can result in vehicle damage.
NOTE: LHD model shown. RHD model similar.
1. Disconnect and isolate the negative battery cable.
2. Remove the glove box (refer to 23 - BODY/INSTRUMENT PANEL/GLOVE BOX - REMOVAL).
3. Reach through glove box opening in the instrument panel and disconnect the wire harness connector (1) from the blower motor resistor (2) located on the rear of the HVAC housing (3).
4. Remove the two screws (4) that secure the blower motor resistor to the HVAC housing and remove the resistor.
INSTALLATION
NOTE: LHD model shown. RHD model similar.
1. Position the blower motor resistor (2) onto the rear of the HVAC housing (3) through the glove box opening.
2. Install the two screws (4) that secure the blower motor resistor to the HVAC housing. Tighten the screws to 1.2 N·m (10 in. lbs.).
3. Connect the wire harness connector (1) to the blower motor resistor.
4. Install the glove box (refer to 23 - BODY/INSTRUMENT PANEL/GLOVE BOX - INSTALLATION).
5. Reconnect the negative battery cable.