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- The air volume stage 3 terminal in the blower switch connector sends voltage signal according to the blower switch position (OFF, 1, 2, 3 or 4) to the engine-ECU connector terminal "BFAN".
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- The engine-ECU adjusts the alternator generating voltage according to the blower switch position.
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- The engine-ECU uses the blower switch position signal to stop and restart the engine, based on the AS&G system principle.
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- Failed blower fan switch
- Open/short circuit or harness damage in blower fan circuit or loose connector contact
- Open/short circuit or harness damage in blower fan switch position signal circuit or loose connector contact
- Failed engine-ECU
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- Data list reference table (Refer to
).
- Item 176: Blower fan switch
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
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- Measure engine-ECU connector terminal voltage.
- Ignition switch: ON
- Voltage between terminal BFAN line and earth.
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OK:
System voltage (Blower switch position: OFF) 3 - 9 V (Blower switch position: 1 or 2) 1 V or less (Blower switch position: 3 or 4)
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Q.
Is the check result normal?
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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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- The blower fan speed should correspond to the blower fan switch position.
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Q.
Is the check result normal?
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Check the blower fan-related circuit (Refer to GROUP 55A - Troubleshooting - Trouble symptom Chart ).
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- Data list reference table (Refer to
).
- Item 176: Blower fan switch
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
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