Rear Blower Motor

REAR BLOWER MOTOR





Diagnosis Procedure
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 20A fuse [No. 16, located in fuse block (J/B)].

NOTE:
Fuse Block - Junction Box (J/B).
Is the inspection result normal?
YES - GO TO 2.
NO - Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK REAR BLOWER MOTOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect rear blower motor connector.
3. Turn ignition switch ON.
4. Check voltage between rear blower motor harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair harness or connector between rear blower motor and fuse block (J/B).
3.CHECK REAR BLOWER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear blower motor harness connector and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair harness or connector.
4.CHECK REAR BLOWER MOTOR CONTROL SIGNAL CIRCUIT
1. Disconnect A/C auto amp. connector.
2. Check continuity between rear blower motor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair harness or connector.
5.CHECK REAR BLOWER MOTOR CONTROL SIGNAL
1. Reconnect rear blower motor connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Operate MODE switch to set air outlet to VENT.
4. Change fan speed from Lo to Hi, and check duty ratios between rear blower motor harness connector and ground by using an oscilloscope.

NOTE:
Calculate drive signal duty ratio as shown in the figure.





T2 = Approx. 1.6 ms






Is the inspection result normal?
YES - Replace rear blower motor. Removal And Installation.
NO - Replace A/C auto amp.. Service and Repair.




Component Inspection
1.CHECK REAR BLOWER MOTOR-I
1. Remove rear blower motor.
2. Check that there is not any mixing foreign object in the rear blower motor.
Is the inspection result normal?
YES - GO TO 2.
NO - Replace rear blower motor. Removal And Installation.
2.CHECK REAR BLOWER MOTOR-II
Check that there is not breakage or damage in the rear blower motor.
Is the inspection result normal?
YES - GO TO 3.
NO - Replace rear blower motor. Removal And Installation.
3.CHECK REAR BLOWER MOTOR-III
Check that rear blower motor turns smoothly.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace rear blower motor. Removal And Installation.