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If a heater switch signal is not set to the A/C-ECU, the heater switch or the
heater switch circuit system may be defective.
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- Malfunction of the heater switch
- Malfunction of the automatic A/C control panel (A/C-ECU)
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Q.
Is the check result normal?
Go to Step 2.
Repair the connector.
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Q.
Is the heater switch operating properly?
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Replace the heater switch.
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(1)Disconnect the connector, and measure at the wiring harness side. (2)Turn the ignition switch to the "ON" position.
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(3)Voltage between terminal 2 and body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step 5.
Go to Step 4.
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note |
Prior to the wiring harness inspection, check joint connector C-137, C-138, C-132, junction
block connector C-209 and C-207, and repair if necessary.
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- Check the heater switch power supply line for open circuit.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring harness.
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Q.
Is the check result normal?
Go to Step 6.
Repair the connector.
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Q.
Is the check result normal?
Go to Step 7.
Repair the connector.
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- Check the heater switch earth line for open circuit.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction .)
Repair the wiring harness.
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