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If air volume cannot be adjusted by using the blower control, the A/C control
panel, the heater controller assembly (A/C-ECU) or the power transistor may be faulty.
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- Malfunction of the power transistor
- Damaged wiring harness or connectors
- Malfunction of the heater controller assembly (A/C-ECU)
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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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Repair the CAN bus lines (Refer to GROUP 54C, Troubleshooting ).
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Check that the diagnosis code related to the air conditioner is not 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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(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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Repair the wiring harness wires between power transistor connector terminal No.
1 and body earth.
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Q.
Is the check result normal?
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Repair the connector(s) or wiring harness.
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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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