Rear Blower Motor Circuit
Rear Blower Motor CircuitSYMPTOM:
- Blower motor operation is malfunctioning.
Step 1-6:
INSPECTION FLOW
SYSTEM DESCRIPTION
Component Parts
Rear blower speed control system components are:
- Front air control
- Rear blower switch (front)
- Rear air control
- Rear blower motor resistor
- Rear blower motor
- Rear blower motor relay
System Operation
Rear Blower Control
When the rear blower control dial (front) is in the OFF position, the rear blower motor cannot operate.
When the rear blower control dial (front) is in the REAR position, it allows the rear blower switch (rear) to control the rear blower motor speed. In any other position (1-4), the rear blower switch (front) controls the rear blower motor speed regardless of the rear blower switch (rear) position.
DIAGNOSTIC PROCEDURE FOR REAR BLOWER MOTOR
Step 1-2:
Step 3-4:
Rear Blower Switch (Rear) Circuit
SYMPTOM:
- Rear blower motor does not rotate when rear blower switch (front) is set to REAR position and the rear blower switch (rear) is set at 1-4 speed.
Step 1-5:
Step 6-9:
Step 10-14:
Step 15-17:
Step 18-20:
Trouble Diagnosis Procedure For Rear Blower Motor (1 - 4 Speed)
SYMPTOM:
- Rear blower motor does not rotate when rear blower control dial (front) is set at 1 - 4 speed.
Step 1-6:
Inspection Flow
COMPONENT INSPECTION
Rear Blower Motor Relay
Check circuit continuity between terminals by supplying 12 volts and ground to coil side terminals of relays.
Rear Blower Switch (Rear)
Check continuity between terminals at each switch position.
Rear Blower Switch (Front)
Check continuity between terminals at each switch position.
Rear Blower Motor
Check that there are no foreign particles inside the intake unit.
Apply 12 volts to terminal 2 and ground to terminal 1 and ensure that the blower motor rotates freely and quietly.
Rear Blower Motor Resistor
Check continuity between terminals. There will be resistance, but there should not be an open or short between any two terminals.