Automatic Air Conditioning

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*2
1.Press fan (UP: +) switch (turn fan control dial clockwise). Blower should operate on low speed.
NOTE:
*1: With left and right ventilation temperature separately control system.
*2: Without left and right ventilation temperature separately control system.
*1*2
2.Press fan (UP: +) switch (turn control dial clockwise), and continue checking fan speed and fan symbol until all speeds checked.
NOTE:
*1: With left and right ventilation temperature separately control system.
*2: Without left and right ventilation temperature separately control system.
Is the inspection result normal?
YES- INSPECTION END
NO- Go to diagnosis procedure. .


Diagnosis Procedure


1. PERFORM SELF-DIAGNOSIS STEP-4

Perform self-diagnosis STEP-4. Without Plasmacluster System, see Nos. 1 to 5.





Does blower motor speed change according to each code No.?
YES- INSPECTION END
NO- GO TO 2.

2. CHECK POWER SUPPLY FOR BLOWER MOTOR

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 CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND UNIFIED METER AND A/C AMP.

1.Disconnect unified meter and A/C amp. connector.
2.Check continuity between blower motor harness connector and unified meter and A/C amp. harness connector.





3.Check continuity between blower motor harness connector and ground.





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

5. CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL

1.Reconnect blower motor connector and unified meter and A/C amp. connector.
2.Turn ignition switch ON.
3.Set MODE switch to VENT position.
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 the drive signal duty ratio as shown in the figure.





T2 = 1.6 ms





Is the inspection result normal?
YES- Replace blower motor after confirming the fan air flow does not change.
NO- Replace unified meter and A/C amp.

6. CHECK POWER VOLTAGE OF BLOWER RELAY

1.Turn ignition switch OFF.
2.Remove blower relay. Fuse Block - Junction Box (J/B).
3.Turn ignition switch ON.
4.Check the voltage between blower relay fuse block terminals and ground. Description and Operation
for relay terminal assignment.





Is the inspection result normal?
YES- GO TO 7.
NO- Check ignition power supply circuit. Ignition Power Supply.

7. CHECK BLOWER RELAY

1.Turn ignition switch OFF.
2.Install blower relay. Fuse Block - Junction Box (J/B).
3.Check operation sound of the blower relay after switching ignition switch ON.
Is the inspection result normal?
YES- GO TO 8.
NO- Replace blower relay.

8. 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.
NO- Be sure to eliminate cause of malfunction before installing new fuse.


Component Inspection


1. CHECK BLOWER MOTOR

1.Remove blower motor. Exploded View.
2.Confirm smooth rotation of the blower motor.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace blower motor.