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DTC 18

BHE070201038W07

DTC 18 | Air mix actuator (potentiometer) system inspection
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POSSIBLE CAUSE | • Air mix actuator malfunction • Open circuit in wiring harness between A/C amplifier and air mix actuator • Short circuit in wiring harness between A/C amplifier (terminal 2H) and air mix actuator (terminal E)

Diagnostic Procedure

STEP | INSPECTION | ACTION
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1 | • Inspect the air mix actuator. (See AIR MIX ACTUATOR INSPECTION.) • Is it normal? | Yes | Go to the next step.
No | Replace the air mix actuator. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
2 | • Disconnect the airflow mode actuator connector. • Is the resistance between terminals 2H and 2P of the A/C amplifier connector (16-pin) 698 ohms or more? | Yes | Go to the next step.
No | Repair the wiring harness. (Short circuit)
3 | • Disconnect the A/C amplifier connector (16-pin). • Is the resistance between terminals 2O and 2P of the A/C amplifier connector (16-pin) 6.0 kilohms or less? | Yes | Go to the next step.
No | Repair the wiring harness. (Open circuit)
4 | • Is the resistance between terminals 2H and 2O of the A/C amplifier connector (16-pin) 5.2 kilohms or less? | Yes | Inspect the connection at the A/C amplifier connector (16-pin). (See A/C AMPLIFIER INSPECTION [FULL-AUTO AIR CONDITIONER].)
No | Repair the wiring harness. (Open circuit)