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If a PTC heater switch signal is
not set to the A/C-ECU, the PTC heater switch or the
PTC heater switch circuit system may be defective.
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- Malfunction of the PTC heater switch
- Malfunction of the automatic air conditioner control
panel (A/C-ECU)
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![](../../../img/55/AC313406AM00ENG.png)
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Q.
Is the check result normal?
Go to Step
2.
Repair
the connector.
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Q.
Is the refrigerant temperature switch operating
properly?
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Replace the
refrigerant temperature switch.
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![](../../../img/55/AC313406AM00ENG.png)
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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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![](../../../img/55/AC310507EK00ENG.png)
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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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![](../../../img/55/AC313409AE00ENG.png)
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note |
Prior to the wiring harness
inspection, check joint connector C-01 and
junction block connector C-205 and C-202, and
repair if necessary.
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- Check the PTC 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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![](../../../img/55/AC313406AB00ENG.png)
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Q.
Is the check result normal?
Go to Step
6.
Repair
the connector.
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![](../../../img/55/AC313407AQ00ENG.png)
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- Check the PTC 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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