Blower Motor

BLOWER MOTOR





Description

COMPONENT DESCRIPTION

Brush-less Motor





The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness is improved over previous motors where the brush was the point of contact and the coil rotated.




Component Function Check
1.CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK
1. Turn fan control dial clockwise. Blower should operate on low speed.
2. Turn fan control dial clockwise, and continue checking blower speed and fan LEDs until all speeds checked.
Is the inspection result normal?
YES - Inspection End.
NO - Go to diagnosis procedure. SEE Diagnosis Procedure.




Diagnosis Procedure
Regarding Wiring Diagram information, [1][2]Electrical Diagrams.
1.CHECK BLOWER MOTOR OPERATING
Check blower motor operating.
Is blower motor operation under starting blower speed control?
YES - Inspection End.
NO - GO TO 2.
2.CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Disconnect blower motor connector.
2. Turn ignition switch ON (READY).
3. Check voltage between blower motor harness connector M31 terminal 4 and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 6.
3.CHECK BLOWER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between blower motor harness connector M31 terminal 1 and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair harness or connector.
4.CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND AUTO AMP.
1. Disconnect auto amp. connector.
2. Check continuity between blower motor harness connector M31 terminal 3 and auto amp. harness connector M37 terminal 1.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair harness or connector.
5.CHECK AUTO AMP. OUTPUT SIGNAL
1. Reconnect blower motor connector and auto amp. connector.
2. Turn ignition switch ON (READY).
3. Set MODE switch to VENT position.
4. Change fan speed from Lo to Hi, and check duty ratios between blower motor harness connector M31 ter- minal 3 and ground by using an oscilloscope. Normal terminal 3 drive signal duty ratios are shown in the table below.





Is the inspection result normal?
YES - Replace blower motor after confirming the fan air flow does not change.
NO - Replace auto amp. Service and Repair.
6.CHECK POWER VOLTAGE OF BLOWER FAN MOTOR RELAY
1. Turn ignition switch OFF.
2. Remove blower fan motor relay. Component Locations.
3. Turn ignition switch ON (READY).
4. Check the voltage between blower fan motor relay fuse block terminals 1, 3 and body ground. Standardized Relay for relay terminal assignment.





Is the inspection result normal?
YES - GO TO 8.
NO - GO TO 7.
7.CHECK IGNITION SWITCH
Check ignition switch.
Is the inspection result normal?
YES - Repair harness or connector.
NG - Replace ignition switch.
8.CHECK BLOWER FAN MOTOR RELAY
1. Turn ignition switch OFF.
2. Install blower fan motor relay. Component Locations.
3. Check operation sound of the blower fan motor relay after switching ignition switch ON.
Is the inspection result normal?
YES - GO TO 9.
NO - Replace blower fan motor relay.
9.CHECK FUSE
Check fuse 15A [Nos 21 and 22, located in the fuse block (J/B)]. Fuse Block - Junction Box (J/B).
Is the inspection result normal?
YES - Repair harness or connector.
NG - Replace fuse.




Component Inspection





Confirm smooth rotation of the blower motor (1).