Front Blower Motor Circuit
Front Blower Motor CircuitSYMPTOM:
- Blower motor operation is malfunctioning.
Step 1-5:
INSPECTION FLOW
SYSTEM DESCRIPTION
Component Parts
- Front air control
- Front blower switch
- Variable blower control
- Front blower motor
- Front blower motor relay
System Operation
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control is located on the heater and cooling unit assembly. The variable blower control receives a gate voltage from the front air control to steplessly maintain the blower motor voltage in the 0 to 5 volt range (approx.).
Step 1-2:
Step 3-6:
Step 7-10:
Step 11-14:
Step 15:
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning.
COMPONENT INSPECTION
Front Blower Motor Relay
Check continuity between terminals 3 and 5 by supplying 12 volts and ground to coil side terminals of relay.
Front Blower Motor
Confirm smooth rotation of the blower motor.
- Ensure that there are no foreign particles inside the blower unit.
- Apply 12 volts to terminal 2 and ground to terminal 1 and verify that the motor operates freely and quietly.