INSPECTION
PROCEDURE 3: The 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 blower motor
- Malfunction of the power transistor
- Malfunction of the heater controller assembly (A/C-ECU)
- Damaged wiring harness or connectors
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the CAN bus lines (Refer to GROUP 54C -
Troubleshooting  ).
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STEP 2. M.U.T.-III diagnosis code.
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) to ON
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Carry out the diagnosis code procedures. Refer to .
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Go to Step 3.
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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. Check the 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 5.
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Replace the blower motor.
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STEP 5. Voltage measurement at blower motor 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)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 6.
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INSPECTION PROCEDURE 14: Refer to "Blower motor power supply system" .
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STEP 6. Resistance measurement at the C-109 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 1 and body earth
OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the wiring harness wires between power transistor connector terminal No.
1 and body earth.
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STEP 7. Check of open circuit in power transistor power supply line
between blower motor and power transistor connector.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair the connector(s) or wiring harness.
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STEP 8. Check of open circuit in P/TB and P/TC line between blower
motor, power transistor and heater controller assembly (A/C-ECU) connector.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair the connector(s) or wiring harness.
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STEP 9. Replace the power transistor and recheck the trouble symptom
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Check that the 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 heater controller assembly (A/C-ECU).
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