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If the heater controller assembly (A/C-ECU) is not energised, the power supply or earth system to the ECU may be defective.
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- Malfunction of the fuse
- Malfunction of the fusible link
- Malfunction of the Ignition switch <Vehicles without KOS> or IG2 relay <Vehicles with KOS>
- Malfunction of the heater controller assembly (A/C-ECU)
- Damaged wiring harness or connectors
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Q.
Is the fuse (23), (26), (13) in good condition?
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Q.
Is the check result normal?
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Replace the fuse (23), (26), (13).
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Repair or replace the connector(s) or wiring harness.
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Q.
Is the fusible link (2) in good condition?
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Q.
Is the check result normal?
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Replace the fusible link (2).
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Repair or replace the connector(s) or wiring harness.
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Q.
Is the fuse (15) in good condition?
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Q.
Is the check result normal?
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Repair or replace the connector(s) or wiring harness.
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Q.
Is the Ignition switch <Vehicles without KOS> or IG2 relay <Vehicles with KOS> in good condition?
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Q.
Is the check result normal?
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Replace the Ignition switch <Vehicles without KOS> or IG2 relay <Vehicles with KOS>.
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Repair or replace the connector(s) or wiring harness.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Continuity between terminal E and body earth OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Repair or replace the connector(s) or wiring harness.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Replace the heater controller assembly (A/C-ECU) (Refer to ).
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