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- Battery voltage is applied from AC/S terminal on the engine-ECU connector through the dual pressure switch to the A/C switch terminal on the heater control panel connector.
- It is earthed from the A/C switch terminal on the heater control panel connector through the blower switch to vehicle body.
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- When the A/C switch is turned on and the blower switch is not turned off with the dual pressure switch ON conditions satisfied, the A/C switch ON signal is sent to the engine-ECU. The engine-ECU uses this signal to control the A/C compressor relay.
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- Failed A/C switch of heater control unit
- Failed blower switch of heater control unit
- Failed dual pressure switch
- Open/short circuit or harness damage in A/C switch circuit or loose connector contact
- Failed engine-ECU
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- Data list reference table (Refer to
).
- Item 76: A/C 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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- Disconnect connector, and measure at the harness side.
- Ignition switch: ON
- Voltage between terminal AC/S line and earth.
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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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- Check the dual pressure switch (Refer to GROUP 55A - On-vehicle Service - Dual Pressure Switch Check
).
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Q.
Is the check result normal?
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Replace the dual pressure switch.
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- Check the A/C switch (Refer to GROUP 55A - Heater Control Unit - Inspection
).
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Q.
Is the check result normal?
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Replace the heater control unit.
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- Check the blower switch (Refer to GROUP 55A - Heater Control Unit - Inspection
).
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Q.
Is the check result normal?
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Replace the heater control unit.
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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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Q.
Is the check result normal?
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Repair the connector(s) or wiring harness.
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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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Q.
Is the check result normal?
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
- Data list reference table (Refer to
).
- Item 76: A/C 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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