RESISTOR-BLOWER MOTOR
DESCRIPTION
The blower motor resistor is mounted to the rear of the HVAC housing, directly behind the glove box. The blower motor resistor consists of a molded plastic mounting plate (1) with an integral wire connector receptacle (2). Concealed behind the mounting plate is the resistor circuit board (3).
The blower motor resistor is accessed for service by opening the glove box.
OPERATION
The blower motor resistor is connected to the vehicle electrical system through a dedicated wire lead and connector of the HVAC wire harness. The blower motor resistor has multiple resistor circuits, each of which will reduce the current flow through the blower motor to change the blower motor speed.
The blower motor control in the MTC heating-A/C system directs the ground path for the blower motor through the correct resistor circuit 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 resistor circuits. Each higher speed selected with the blower motor control applies the blower motor ground path through fewer of the resistor circuits, 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 must be replaced if found inoperative or damaged.
REMOVAL
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury or death.
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.
NOTE: LHD model shown. RHD model similar.
1. Disconnect and isolate the negative battery cable.
2. Open the glove box door to gain access to the blower motor resistor (1).
3. Pull out the lock on the blower motor resistor wire harness connector (3) to unlock the connector latch.
4. Depress the latch on the blower motor resistor wire harness connector and disconnect the wire harness from the resistor.
5. Remove the two screws (2) that secure the blower motor resistor to the HVAC housing (4) and remove the resistor.
INSTALLATION
NOTE: LHD model shown. RHD model similar.
1. Position the blower motor resistor (1) into the HVAC housing (4).
2. Install the two screws (2) that secure the blower motor resistor to the HVAC housing. Tighten the screws to 2 N·m (17 in. lbs.).
3. Connect the wire harness connector (3) to the blower motor resistor.
4. Push in the lock on the blower motor resistor wire harness connector.
5. Close the glove box door.
6. Reconnect the negative battery cable.