Manual Air Conditioning

BLOWER MOTOR

Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" Automatic Air Conditioning.

1. CHECK FUSE

1.Turn ignition switch OFF.
2.Check 15A fuses [Nos. 17 and 27, located in fuse block (J/B)].
NOTE:
Refer to "Terminal Arrangement" 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.

2. CHECK BLOWER MOTOR POWER SUPPLY

1.Disconnect blower motor connector.
2.Turn ignition switch ON.
3.Check voltage between blower motor harness connector 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 and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair harness or connector.

4. CHECK BLOWER MOTOR CONTROL SIGNAL CIRCUIT

1.Disconnect front air control connector.
2.Check continuity between blower motor harness connector and front air control harness connector.





Is the inspection result normal?
YES- GO TO 5.
NO- Repair the harness or connector.

5. CHECK BLOWER MOTOR CONTROL SIGNAL

1.Reconnect blower motor connector and front air control 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 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 blower motor. Refer to "BLOWER MOTOR : Removal and Installation" Blower Motor.
NO- Replace front air control. Refer to "Removal and Installation" Removal And Installation.

6. CHECK BLOWER MOTOR RELAY GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Check continuity between fuse block (J/B) harness connector and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- Repair harness or connector.

7. CHECK FRONT BLOWER MOTOR RELAY

Check front blower motor relay. Refer to "Component Inspection (Front Blower Motor Relay)" .
Is the inspection result normal?
YES- Repair harness or connector between blower motor and fuse block (J/B).
NO- Replace front blower motor relay.


Component Inspection (Blower Motor)


1. CHECK BLOWER MOTOR

1.Connect battery voltage to terminal 1 of blower motor.
2.Connect ground to terminal 2 of blower motor.
Does the blower fan operate?
YES- Intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace blower motor. Refer to "BLOWER MOTOR : Removal and Installation" Blower Motor.


Component Inspection (Front Blower Motor Relay)


1. CHECK BLOWER RELAY

1.Turn ignition switch OFF.
2.Remove front blower motor relay.





3.Check continuity between front blower motor relay terminals 3
and 5 when voltage is supplied between terminals 1 and 2.





Is the inspection result normal?
YES- Inspection End.
NO- Replace front blower motor relay.