Blower Motor Circuit

Blower Motor Circuit

SYMPTOM:
- Blower motor operation is malfunctioning.

Inspection Flow:

INSPECTION FLOW

SYSTEM DESCRIPTION

Component Parts
Fan speed control system components are:
- Front air control
- LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
- Blower motor
- Fan control amplifier




System Operation

COMPONENT DESCRIPTION




Fan Control Amplifier
The fan control amplifier (1) is located on the cooling unit. The fan control amp. receives a gate voltage from the front air control to smoothly maintain the blower fan motor voltage in the 5 to the 12 V range (approx.).

Diagnostic Procedure (Steps 1 - 2):

Diagnostic Procedure (Steps 3 - 5):

Diagnostic Procedure (Steps 6 - 7):

Diagnostic Procedure (Step 8):

DIAGNOSTIC PROCEDURE

SYMPTOM: Blower motor is malfunctioning.

COMPONENT INSPECTION




Blower Motor
Confirm smooth rotation of the blower motor (1).
- Ensure that there are no foreign particles inside the intake unit.