Inspection Procedure 27: Rear blower motor power supply system <RHD (Vehicles for Hong Kong and Singapore)>

CIRCUIT OPERATION
If the rear blower motor does not operate, the rear blower motor circuit system may be defective.

PROBABLE CAUSES

  • Malfunction of rear blower relay
  • Malfunction of rear blower motor
  • Malfunction of rear power transistor
  • Malfunction of the A/C-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-215 rear blower motor connector

Q. Is the check result normal?

Go to Step 2.

Repair the connector.

STEP 2. Check the rear blower relay
Refer to .

Q. Is the check result normal?
Go to Step 3.
Replace the rear blower relay.

STEP 3. Connector check: C-15 intermediate connector

Q. Is the check result normal?

Go to Step 4.

Repair the connector.

STEP 4. Voltage measurement at C-15 intermediate connector.

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


(3)Disconnect A/C-ECU connector C-104 and earth terminal 56.

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

Q. Is the check result normal?

Go to Step 11.

Go to Step 5.

STEP 5. Voltage measurement at C-215 rear blower relay connector.

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

(3)Voltage between terminal 3 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 7.

Go to Step 6.

STEP 6. Check the wiring harness between C-215 rear blower relay connector terminal No.3 and the ignition switch (IG2).

note Prior to the wiring harness inspection, check junction block connectors C-202 and C-205, and repair if necessary.

  • Check the rear 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 7. Voltage measurement at C-215 rear blower relay connector.

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

(3)Voltage between terminal 4 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 9.

Go to Step 8.

STEP 8. Check the wiring harness between C-215 rear blower relay connector terminal No.4 and the fusible link (30).


note Prior to the wiring harness inspection, check intermediate connector C-125 and junction block connector C-201, and repair if necessary.

  • Check the rear 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 9. Check the wiring harness between C-215 rear blower relay connector terminal No.2 and C-104 A/C-ECU connector terminal No.56.


note Prior to the wiring harness inspection, check junction block connector C-201, and repair if necessary.

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

Q. Is the check result normal?

Go to Step 10.

Repair the wiring harness.

STEP 10. Check the wiring harness between C-215 rear blower relay connector terminal No.4 and C-15 intermediate connector terminal No.1.


note Prior to the wiring harness inspection, check junction block connector C-201, and repair if necessary.

  • Check the rear 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 11. Connector check: D-10 rear blower motor

Q. Is the check result normal?

Go to Step 12.

Repair the connector.

STEP 12. Check the rear blower motor
Refer to .

Q. Is the check result normal?
Go to Step 13.
Replace the rear blower motor.

STEP 13. Check the wiring harness between D-10 rear blower motor connector terminal No.1 and C-15 intermediate connector terminal No.1.



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

Q. Is the check result normal?

Go to Step 14.

Repair the wiring harness.

STEP 14. Connector check: D-11 rear power transistor connector

Q. Is the check result normal?

Go to Step 15.

Repair the connector.

STEP 15. Resistance measurement at the D-11 rear power transistor connector.

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

(2)Continuity between terminal 2 and body earth
OK: 2Ω or less

Q. Is the check result normal?

Go to Step 17.

Go to Step 16.

STEP 16. Check the wiring harness between D-11 rear power transistor terminal No.2 and body earth.


  • Check the blower linear controller 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 17. Connector check: C-104 A/C-ECU connector

Q. Is the check result normal?

Go to Step 18.

Repair the connector.

STEP 18. Check the wiring harness between D-11 rear power transistor connector terminal No.4 and D-10 rear blower motor connector terminal No.2.


  • Check the blower linear controller earth line for open circuit.

Q. Is the check result normal?

Go to Step 19.

Repair the wiring harness.

STEP 19. Check the wiring harness between D-11 rear power transistor connector (terminal 1 and 3) and D-10 A/C-ECU connector (terminal 60 and 59).


note Prior to the wiring harness inspection, check intermediate connector C-15, and repair if necessary.

  • Check the blower linear controller earth line for open circuit.

Q. Is the check result normal?

Go to Step 20.

Repair the wiring harness.

STEP 20. Replace the rear power transistor and recheck the trouble symptom
Check that the rear blower motor should work normally.

Q. Is the check result normal?
This diagnosis is complete.
Replace the A/C-ECU.