DTC 77

id070200804500

DTC 77

Rear air mix actuator (potentiometer) (past)

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)

DTC 77	Rear air mix actuator (potentiometer) (past)
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
1	• Inspect rear air mix actuator. (See REAR AIR MIX ACTUATOR INSPECTION.) • Is it okay?	Yes	Go to the next step.
1		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.
2		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.
3		No	This system is normal at present. (Erase the past failure from memory.)