Inspection Procedure 3: The front blower does not work
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COMMENTS ON TROUBLE SYMPTOM
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If the blower motor does not operate, the
blower motor circuit system may be defective.
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- Malfunction of the front blower motor (blower linear
controller).
- Malfunction of the front power transistor.
- Malfunction of the automatic A/C control panel
(A/C-ECU)
- Damaged the wiring harness or connectors
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STEP 1. Check the operation of the heater control panel
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Check that the A/C switch, rear window
defogger switch and outside/inside air selection switch can
operate.
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Q.
Is the check result normal?
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Go to Step 2.
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Inspection Procedure 14: Refer to
A/C-ECU power supply system .
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STEP 2. Connector check: D-406 front blower relay
connector
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Q.
Is the check result normal?
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Go to Step 3.
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Repair
the connector.
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STEP 3. Check the blower relay.
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Refer to .
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Q.
Is the blower relay in good condition?
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Go to Step 4.
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Replace the blower relay.
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STEP 4. Connector check: D-15 front blower motor connector and D-08
A/C-ECU connector
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
the connector.
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STEP 5. Voltage measurement at the D-15 front blower motor controller
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the ignition switch to the ON position.
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(3)Disconnect A/C-ECU connector D-08, and earth
terminal 16.
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(4)measure the voltage between terminal 1 and body
earth. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 12.
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Go to Step 6.
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STEP 6. Voltage measurement at D-406 front blower relay
connector.
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(1)Remove the relay, and measure at the junction block
side.
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(2)Turn the ignition switch to the ON position.
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(3)Voltage between terminal 1 and body
earth. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 7.
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STEP 7. Check the wiring harness between D-406 front blower relay
connector terminal No.1 and the ignition switch (IG2).
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note |
Prior to the wiring harness inspection, check
junction block connector D-403, and repair if necessary.
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- Check the blower relay power supply line for open circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 8. Voltage measurement at D-406 front blower relay
connector.
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(1)Remove the relay, and measure at the junction block
side.
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(2)Voltage between terminal 5 and body
earth. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 9.
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STEP 9. Check the wiring harness between D-406 front blower relay
connector terminal No.5 and fusible link (2).
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note |
Prior to the wiring harness inspection, check
intermediate connectors D-240 and junction block connector D-404, and
repair if necessary.
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- Check the blower relay power supply line for open circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 10. Check the wiring harness between D-406 front blower relay
connector terminal No.4 and D-15 front blower motor connector terminal
No.1.
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note |
Prior to the wiring harness inspection, check
junction block connector D-403, and repair if necessary.
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- Check the blower relay earth wires for open circuit.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the wiring harness.
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STEP 11. Check the wiring harness between D-406 front blower relay
connector terminal No.3 and D-08 A/C-ECU connector terminal
No.16.
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note |
Prior to the wiring harness inspection, check
junction block connector D-405, and repair if necessary.
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- Check the blower relay power supply line for open circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 12. Check the front blower motor
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Refer to .
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Q.
Is the check result normal?
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Go to Step 13.
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Replace the outside/inside air
selection damper control motor.
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STEP 13. Connector check: D-116 power transistor controller
connector
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Q.
Is the check result normal?
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Go to Step 14.
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Repair
the connector.
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STEP 14. Resistance measurement at the D-116 power transistor
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Continuity between terminal 4 and body
earth OK: Continuity (Less than 2 ohms)
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Q.
Is the check result normal?
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Go to Step 16.
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Go to Step 15.
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STEP 15. Check the wiring harness between D-116 power transistor
connector terminal No.2 and body earth.
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- Check the power transistor earth line for open circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 16. Check the wiring harness between D-15 blower motor connector
terminal No.2 and D-116 power transistor controller connector terminal
No.1.
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- Check the power transistor power supply line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 17.
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Repair
the wiring harness.
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STEP 17. Check the wiring harness between D-403 junction block
connector terminal No.3 and D-116 power transistor controller connector
terminal No.2.
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- Check the power transistor power supply line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 18.
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Repair
the wiring harness.
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STEP 18. Check the wiring harness between D-08 A/C-ECU connector
terminal No.11 and D-116 power transistor controller connector terminal
No.3.
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- Check the power transistor input line for open circuit.
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Q.
Is the check result normal?
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Go to Step 19.
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Repair
the wiring harness.
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STEP 19. Replace the power transistor and recheck the trouble
symptom
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Check that the front blower motor operates
normally.
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Q.
Is the check result normal?
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This
diagnosis is complete.
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Replace the A/C-ECU.
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