INSPECTION PROCEDURE 12: Blower motor power supply system


COMMENTS ON TROUBLE SYMPTOM
If the blower motor is not energised, the blower relay system is suspected.

PROBABLE CAUSES

  • Malfunction of the blower relay
  • Wiring harness or connector failure
  • Malfunction of ETACS-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-402 blower relay connector

Q. Is the check result normal?
Go to Step 2.
Repair the connector concerned.

STEP 2. Measure the voltage at C-402 blower relay connector.
(1)Remove the relay, and measure at the junction block side.
(2)Voltage between terminals 1, 4 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 4.
Go to Step 3.

STEP 3. Check the wiring harness between C-402 blower relay connector terminal No. 4, 1 and fusible link (37) <Petrol engine> or fusible link (42) <Diesel engine>.

  • Check the power supply line for open circuit.
note Prior to the wiring harness inspection, check ETACS-ECU connector C-408, and repair if necessary.

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.

STEP 4. Connector check: C-213 blower motor connector

Q. Is the check result normal?
Go to Step 5.
Repair the connector concerned.

STEP 5. Check the wiring harness between C-213 blower motor connector terminal No. 1 <LHD> or 2 <RHD> and C-402 blower relay connector terminal No. 3.
note Prior to the wiring harness inspection, check junction block connector C-415, and repair if necessary.

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness.

STEP 6. Retest the system.
Check that the blower motor is energised.

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace ETACS-ECU.