INSPECTION
PROCEDURE 3: The blower does not work
|
COMMENTS ON TROUBLE SYMPTOM
|
|
If the blower motor does not operate, the blower motor circuit system may be defective.
|
|
- Malfunction of the fuse
- Malfunction of the fusible link
- Malfunction of the blower motor
- Malfunction of the blower relay
- Malfunction of the power transistor
- Malfunction of the heater controller assembly (A/C-ECU)
- Damaged wiring harness or connectors
|
|
STEP 1. M.U.T.-III CAN bus diagnostics.
|
|
Use the M.U.T.-III to diagnose the CAN bus lines.
|
|
Q.
Is the check result normal?
|
|
Go to Step 2.
|
|
|
|
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
|
|
|
|
STEP 2. M.U.T.-III diagnosis code.
|
|
Check that the diagnosis code related to the air conditioner is not set (Refer to ).
|
|
Q.
Is the diagnosis code set?
|
|
Carry out the diagnosis code procedures.
|
|
|
|
Go to Step 3.
|
|
|
|
STEP 3. M.U.T.-III diagnosis code for other systems.
|
|
Use M.U.T.-III to check that the diagnosis code is set in the engine-ECU (Refer to GROUP
13A - Diagnosis code chart <4G6>, Refer to GROUP
13B - Diagnosis code chart <4D5> or Refer to GROUP
13C - Diagnosis code chart <4N1>).
|
|
Q.
Is the diagnosis code set?
|
|
Carry out the diagnosis for the diagnosis code.
|
|
|
|
Go to Step 4.
|
|
|
|
STEP 4. Check the data list below on the M.U.T.-III.
|
|
All the following items in the data list should be normal.
|
|
Item No.68: Front blower fan
|
|
Q.
Is the check result normal?
|
|
Go to Step 5.
|
|
|
|
Go to Step 6.
|
|
|
|
STEP 5. Replace the trouble symptom.
|
|
Q.
Is the check result normal?
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Replace the heater controller assembly (A/C-ECU) (Refer to ).
|
|
|
|
STEP 6. Check the fuse (23).
|
|
Q.
Is the fuse (23) in good condition?
|
|
Go to Step 7.
|
|
|
|
Replace the fuse (23).
|
|
|
|
STEP 7. Check the fusible link (2).
|
|
Q.
Is the fusible link (2) in good condition?
|
|
Go to Step 9.
|
|
|
|
Go to Step 8.
|
|
|
|
STEP 8. Check open and short circuit in fusible link line between
fuse (23) and fusible link (2).
|
|
note |
Before the wiring harness check, check the junction block connector.
|
|
|
Q.
Is the check result normal?
|
|
Replace the fusible link (2).
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
STEP 9. Check the blower relay.
|
|
Refer to GROUP 55A - Relay check .
|
|
Q.
Is the blower relay in good condition?
|
|
Go to Step 10.
|
|
|
|
Replace the blower relay.
|
|
|
|
STEP 10. Check the blower motor.
|
|
Refer to GROUP 55A - Blower assembly and resistor inspection .
|
|
Q.
Is the check result normal?
|
|
Go to Step 11.
|
|
|
|
Replace the blower motor (Refer to GROUP 55A - Blower Assembly and Resistor ).
|
|
|
|
STEP 11 Voltage measurement at blower motor connector.
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
(3)Voltage between terminal 1 and body earth. OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 13.
|
|
|
|
Go to Step 12.
|
|
|
|
STEP 12. Check open circuit in blower motor line between blower relay
and blower motor.
|
|
note |
Before the wiring harness check, check the junction block connector and joint connector.
|
|
|
Q.
Is the check result normal?
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
STEP 13. Voltage measurement at heater controller assembly (A/C-ECU)
connector.
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
(3)Voltage between terminal P/TC and body earth. OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 15.
|
|
|
|
Go to Step 14.
|
|
|
|
STEP 14. Check open circuit in P/TC line between blower motor and
heater controller assembly (A/C-ECU) P/TC terminal.
|
|
Q.
Is the check result normal?
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
STEP 15 Voltage measurement at power transistor connector.
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
(3)Voltage between terminal 2 and body earth. OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 17.
|
|
|
|
Go to Step 16.
|
|
|
|
STEP 16. Check open circuit in power transistor line between blower
motor and power transistor connector.
|
|
Q.
Is the check result normal?
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
STEP 17. Voltage measurement at heater controller assembly (A/C-ECU)
connector.
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
(3)Voltage between terminal BASE and body earth. OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 19.
|
|
|
|
Go to Step 18.
|
|
|
|
STEP 18. Check open circuit in BASE line between power transistor
and heater controller assembly (A/C-ECU) BASE terminal.
|
|
Q.
Is the check result normal?
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
STEP 19. Resistance measurement at the power transistor connector.
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Continuity between terminal 1 and body earth OK: Continuity exists (2 Ω or less)
|
|
Q.
Is the check result normal?
|
|
Go to Step 21.
|
|
|
|
Go to Step 20.
|
|
|
|
STEP 20. Check open circuit in power transistor earth line between
power transistor connector and body earth.
|
|
Q.
Is the check result normal?
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
STEP 21. Resistance measurement at the blower relay connector.
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Continuity between terminal 2 and body earth OK: Continuity exists (2 Ω or less)
|
|
Q.
Is the check result normal?
|
|
Go to Step 23.
|
|
|
|
Go to Step 22.
|
|
|
|
STEP 22. Check open circuit in blower relay earth line between blower
relay connector and body earth.
|
|
note |
Before the wiring harness check, check the junction block connector and joint connector.
|
|
|
Q.
Is the check result normal?
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
STEP 23. Resistance measurement at the heater controller assembly
(A/C-ECU) connector.
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Continuity between terminal E and body earth OK: Continuity exists (2 Ω or less)
|
|
Q.
Is the check result normal?
|
|
Go to Step 25.
|
|
|
|
Go to Step 24.
|
|
|
|
STEP 24. Check of open circuit in E line between heater controller
assembly (A/C-ECU) connector E terminal and body earth.
|
|
note |
Before the wiring harness check, check the joint connector.
|
|
|
Q.
Is the check result normal?
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair or replace the connector(s) or wiring harness.
|
|
|
|
STEP 25. Replace the power transistor (Refer to ), and
then recheck the trouble symptom
|
|
Q.
Is the check result normal?
|
|
This diagnosis is complete.
|
|
|
|
Replace the heater controller assembly (A/C-ECU) (Refer to ).
|
|
|