INSPECTION PROCEDURE 11: Blower motor power supply system


caution
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

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

PROBABLE CAUSES

  • Malfunction of the blower relay
  • Damaged wiring harness or connectors
  • Malfunction of the ETACS-ECU

DIAGNOSTIC PROCEDURE

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

Q. Is the check result normal?
Go to Step 3.
Go to Step 2.

STEP 2. Check of open circuit in blower relay power supply line between blower relay connector and fusible link (5).
note Prior to the wiring harness inspection, check ETACS-ECU connector 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 connector(s) or wiring harness.

STEP 3. Check of open circuit in blower motor line between blower motor connector terminal and blower relay.
note Prior to the wiring harness inspection, check ETACS-ECU connector and repair if necessary.

Q. Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.

STEP 4. 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 the ETACS-ECU.