DTC 77

id070200804500

DTC 77 | Rear air mix actuator (potentiometer) (past)
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POSSIBLE CAUSE | • Rear air mix actuator malfunction • Open circuit between rear air mix actuator and front climate control unit • Short circuit between rear air mix actuator (terminal E) and front climate control unit (terminal 2N: 16-pin)

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | • Inspect rear air mix actuator. (See REAR AIR MIX ACTUATOR INSPECTION.) • Is it okay? | Yes | Go to the next step.
No | Replace rear air mix actuator. (See REAR AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
2 | • Disconnect front climate control unit connector (16-pin) and rear air mix actuator connector. • Is there open circuit between following terminals of front climate control unit connector (16-pin) and rear air mix actuator connector? ― 2N—E ― 2B—C ― 2P—A | Yes | Repair wiring harness.
No | Go to the next step.
3 | • Is there short circuit to ground between terminal 2N of front climate control unit connector (16-pin) and terminal E of rear air mix actuator connector? | Yes | Repair wiring harness.
No | This system is normal at present. (Erase the past failure from memory.)