Inspection Procedure 2: The blower does not work

COMMENTS ON TROUBLE SYMPTOM
If the blower motor does not operate, the blower motor circuit system may be defective.

PROBABLE CAUSES

  • Malfunction of the blower relay
  • Malfunction of the blower motor
  • Malfunction of the blower switch
  • Damaged the wiring harness or connectors

DIAGNOSIS PROCEDURE

STEP 1. Check that the blower motor operates when the blower switch is moved to the "4 (HI) " position.
(1)Turn the ignition switch to the "ON" position.
(2)Turn the blower switch to the "4 (HI) " position.

Q. Does the blower motor operate when the blower switch is moved to the "4 (HI) " position?
Refer to Inspection procedure 3 "The blower air volume cannot be changed ."
Go to Step 2.

STEP 2. Connector check: C-28 blower motor connector


Q. Is the check result normal?

Go to Step 3.

Repair the connector.

STEP 3. Resistance measurement at the C-28 blower motor connector.


(1)Disconnect the connector, and measure at the wiring harness side.

(2)Measure the resistance between terminal 2 and body earth.
OK: Continuity (Less than 2Ω)

Q. Is the check result normal?

Go to Step 5.

Go to Step 4.

STEP 4. Check the wiring harness between C-28 blower motor connector terminal No.2 and body earth.



  • Check the blower motor earth line for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

STEP 5. Voltage measurement at C-28 blower motor connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ON" position.
(3)Turn the blower switch to the "4 (HI) " position.

(4)Measure the voltage between terminal 1 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 18.

Go to Step 6.

STEP 6. Connector check: C-201 blower relay connector


Q. Is the check result normal?

Go to Step 7.

Repair the connector.

STEP 7. Check the blower relay continuity.
Refer to .

Q. Is the blower relay continuity in good condition?
Go to Step 8.
Replace the blower relay.

STEP 8. Voltage measurement at C-201 blower relay connector.


(1)Remove the relay, and measure at the junction block side.
(2)Turn the ignition switch to the "ON" position.

(3)Measure the voltage between terminal 1 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 10.

Go to Step 9.

STEP 9. Check the wiring harness between C-201 blower relay connector terminal No.1 and the ignition switch (IG2).


note Prior to the wiring harness inspection, check junction block connector C-207, and repair if necessary.

  • Check the blower relay power supply line for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

STEP 10. Measure the resistance at C-201 blower relay connector.


(1)Remove the relay, and measure at the junction block side.

(2)Measure the resistance Continuity between terminal 2 and body earth.
OK: Continuity (Less than 2Ω)

Q. Is the check result normal?

Go to Step 12.

Go to Step 11.

STEP 11. Check the wiring harness between C-201 blower relay connector terminal No.2 and earth.


note Prior to the wiring harness inspection, check junction block connectors C-208, and repair if necessary.

  • Check the blower relay earth wires for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

STEP 12. Measure the voltage at C-201 blower relay connector.


(1)Remove the relay, and measure at the junction block side.

(2)Measure the voltage between terminal 4 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 14.

Go to Step 13.

STEP 13. Check the wiring harness between C-201 blower relay connector terminal No.4 and fusible link (20).


note Prior to the wiring harness inspection, check junction block connector C-213, and repair if necessary.

  • Check the blower relay power supply line for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

STEP 14. Connector check: C-06 blower switch connector


Q. Is the check result normal?

Go to Step 15.

Repair the connector.

STEP 15. Check the blower switch continuity.
Refer to .

Q. Is the blower switch continuity in good condition?
Go to Step 16.
Replace the blower switch.

STEP 16. Check the wiring harness between C-06 blower switch connector terminal No.3 and C-201 blower relay connector terminal No.3.




note Prior to the wiring harness inspection, check junction block connector C-207, and repair if necessary.

  • Check the blower relay output line for open circuit.

Q. Is the check result normal?

Go to Step 17.

Repair the wiring harness.

STEP 17. Check the wiring harness between C-28 blower motor connector terminal No.1 and C-06 blower switch connector terminal No.5.





  • Check the blower motor power supply line for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

STEP 18. Check the blower motor operation.
Refer to .

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
Replace the blower motor.