Blower Motor: Testing and Inspection
BLOWER MOTOR
Component Function Check
1. CHECK BLOWER MOTOR
With CONSULT
1.Turn power switch ON.
2.Using CONSULT, perform "HVAC TEST" on "ACTIVE TEST" of "HVAC". Refer to "CONSULT Function" CONSULT Function.
3.When the test items are being conducted, check that the blower motor operates normally for each mode.
Refer to Active Test in "CONSULT Function" CONSULT Function.
Is the inspection result normal?
YES- INSPECTION END
NO- Refer to "Diagnosis Procedure" .
Diagnosis Procedure
1. CHECK FUSE
1.Turn power switch OFF.
2.Check 15A fuses [Nos. 14 and 16, located in fuse block (J/B)].
NOTE:
Refer to "Fuse, Connector and 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 if a fuse is blown.
2. CHECK BLOWER MOTOR POWER SUPPLY
1.Disconnect blower motor connector.
2.Turn power switch ON.
3.Check voltage between blower motor harness connector and ground.
Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 3.
3. CHECK BLOWER RELAY
1.Turn power switch OFF.
2.Check blower relay. Refer to "Component Inspection (Blower Relay)" .
Is the inspection result normal?
YES- Repair harness or connector between blower motor and fuse.
NO- Replace blower relay.
4. CHECK BLOWER MOTOR CONTROL CIRCUIT
1.Turn power switch OFF.
2.Connect blower motor connector.
3.Disconnect power transistor connector.
4.Turn power switch ON.
5.Check voltage between power transistor harness connector and ground.
Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 5.
5. CHECK BLOWER MOTOR CONTROL CIRCUIT FOR OPEN
1.Turn power switch OFF.
2.Disconnect blower motor connector.
3.Check continuity between power transistor harness connector and blower motor harness connector.
Is the inspection result normal?
YES- Replace blower motor. Refer to "Removal and Installation" Removal And Installation.
NO- Repair harness or connector.
6. CHECK POWER TRANSISTOR POWER SWITCH POWER SUPPLY
Check voltage between power transistor harness connector and ground.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair harness or connector between power transistor and fuse.
7. CHECK POWER TRANSISTOR GROUND CIRCUIT FOR OPEN
1.Turn power switch OFF.
2.Check continuity between power transistor harness connector and ground.
Is the inspection result normal?
YES- GO TO 8.
NO- Repair harness or connector.
8. CHECK POWER TRANSISTOR CONTROL SIGNAL
1.Connect blower motor connector and A/C auto amp. connector.
2.Turn power switch ON.
3.Set air outlet to VENT.
4.Change fan speed from 1st - 7th, 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 = Approx. 1.6 ms
Is the inspection result normal?
YES- Replace power transistor. Refer to "Removal and Installation" Manual Air Conditioning.
NO- GO TO 9.
9. CHECK POWER TRANSISTOR CONTROL SIGNAL CIRCUIT FOR OPEN
1.Turn power switch OFF.
2.Disconnect power transistor connector and A/C auto amp. connector.
3.Check continuity between power transistor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES- GO TO 10.
NO- Repair harness or connector.
10. CHECK POWER TRANSISTOR CONTROL SIGNAL CIRCUIT FOR SHORT
Check continuity between power transistor harness connector and ground.
Is the inspection result normal?
YES- Replace A/C control (A/C auto amp.). Refer to "Removal and Installation" Service and Repair.
NO- Repair harness or connector.
Component Inspection (Blower Motor)
1. CHECK BLOWER MOTOR
1.Remove blower motor. Refer to "Removal and Installation" Removal And Installation.
2.Check that there is not any mixing foreign object in the blower motor.
Is the inspection result normal?
YES- GO TO 2.
NO- Replace blower motor. Refer to "Removal and Installation" Removal And Installation.
2. CHECK BLOWER MOTOR
Check that there is not breakage or damage in the blower motor.
Is the inspection result normal?
YES- GO TO 3.
NO- Replace blower motor. Refer to "Removal and Installation" Removal And Installation.
3. CHECK BLOWER MOTOR
Check that blower motor turns smoothly.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace blower motor. Refer to "Removal and Installation" Removal And Installation.
Component Inspection (Blower Relay)
1. CHECK BLOWER RELAY
1.Remove blower relay. Refer to "Fuse, Connector and Terminal Arrangement" Fuse Block - Junction Box (J/B).
2.Check continuity between blower relay terminal 3 and 5 when the voltage is supplied between terminal 1 and 2.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace blower relay.