DUAL A/C CONTROL DOES NOT OPERATE [FULL-AUTO AIR CONDITIONER]

DESCRIPTION

• Driver or passenger side temperature control dial does not operate individually

POSSIBLE CAUSE

• Air mix door malfunction (driver or passenger-side)

― Sticking, not operating smoothly

• Front air mix actuator malfunction (driver or passenger-side)

― Motor malfunction

― Potentiometer malfunction

• Open circuit in wiring harness between the following terminals:

Driver-side

― Front climate control unit terminal 1C—front air mix actuator terminal C

― Front climate control unit terminal 2I—front air mix actuator terminal B

― Front climate control unit terminal 1Q—front air mix actuator terminal A

― Front climate control unit terminal 2A—front air mix actuator terminal E

― Front climate control unit terminal 2C—front air mix actuator terminal D

Passenger-side

― Front climate control unit terminal 1C—front air mix actuator terminal A

― Front climate control unit terminal 2K—front air mix actuator terminal B

― Front climate control unit terminal 1Q—front air mix actuator terminal C

― Front climate control unit terminal 1J—front air mix actuator terminal D

― Front climate control unit terminal 1L—front air mix actuator terminal E

• Short to ground in wiring harness between the following terminals:

Driver-side

― Front climate control unit terminal 1C—front air mix actuator terminal C

― Front climate control unit terminal 2I—front air mix actuator terminal B

― Front climate control unit terminal 2A—front air mix actuator terminal E

― Front climate control unit terminal 2C—front air mix actuator terminal D

Passenger-side

― Front climate control unit terminal 1C—front air mix actuator terminal A

― Front climate control unit terminal 2K—front air mix actuator terminal B

― Front climate control unit terminal 1J—front air mix actuator terminal D

― Front climate control unit terminal 1L—front air mix actuator terminal E

• Short to power supply in wiring harness between the following terminals:

Driver-side

― Front climate control unit terminal 1C—front air mix actuator terminal C

― Front climate control unit terminal 2I—front air mix actuator terminal B

― Front climate control unit terminal 1Q—front air mix actuator terminal A

― Front climate control unit terminal 2A—front air mix actuator terminal E

― Front climate control unit terminal 2C—front air mix actuator terminal D

Passenger-side

― Front climate control unit terminal 1C—front air mix actuator terminal A

― Front climate control unit terminal 2K—front air mix actuator terminal B

― Front climate control unit terminal 1Q—front air mix actuator terminal C

― Front climate control unit terminal 1J—front air mix actuator terminal D

― Front climate control unit terminal 1L—front air mix actuator terminal E

• Front climate control unit malfunction

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, inspect to make sure connectors, terminals and wiring harness are connected correctly and undamaged.

Step	Inspection		Action
1	VERIFY SYMPTOM • Turn on the A/C. • Perform the dual A/C control function for driver and passenger side individually. • Is it either the temperature control on driver side or passenger side?	Yes	Go to the next step.
1		No	Go to Step 12.
2	INSPECT TO SEE WHETHER MALFUNCTION IS IN AIR MIX DOOR OR ELSEWHERE • Turn on the A/C. • Change temperature control on the suspected side while in dual mode. • Does the air mix door on the suspect side move smoothly?	Yes	Go to Step 8.
2		No	Go to the next step.
3	INSPECT FRONT AIR MIX ACTUATOR • Inspect the front air mix actuator on the suspect side. (See FRONT AIR MIX ACTUATOR INSPECTION.) • Is the front air mix actuator normal?	Yes	Go to the next step.
3		No	Replace the front air mix actuator on the suspected side, then go to Step 15. (See FRONT AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
4*	INSPECT FRONT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO GROUND • Disconnect the front climate control unit connector. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) • Inspect for continuity between the following terminals (wiring harness-side) and body ground: Driver-side ― Front climate control unit terminal 2C ― Front climate control unit terminal 2A Passenger-side ― Front climate control unit terminal 1J ― Front climate control unit terminal 1L • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front air mix actuator terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 15.
4*		No	Go to the next step.
5*	INSPECT FRONT AIR MIX ACTUATOR CIRCUIT FOR OPEN CIRCUIT • Front air mix actuator and front climate control unit connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): Driver-side ― Front climate control unit terminal 2C—front air mix actuator terminal D ― Front climate control unit terminal 2A—front air mix actuator terminal E Passenger-side ― Front climate control unit terminal 1J—front air mix actuator terminal D ― Front climate control unit terminal 1L—front air mix actuator terminal E • Is there continuity?	Yes	Go to the next step.
5*		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front air mix actuator terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 15.
6*	INSPECT FRONT AIR MIX ACTUATOR CIRCUIT FOR SHORT TO POWER SUPPLY • Front air mix actuator and front climate control unit connectors are disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminals (wiring harness-side): Driver-side ― Front climate control unit terminal 2C ― Front climate control unit terminal 2A Passenger-side ― Front climate control unit terminal 1J ― Front climate control unit terminal 1L • Is the voltage 0 V?	Yes	Go to the next step.
6*		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front air mix actuator terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 15.
7	INSPECT AIR MIX DOOR • Inspect the suspect side air mix door. • Is the air mix door normal?	Yes	Replace the front climate control unit, then go to Step 15. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)
7		No	Remove the obstruction or replace A/C unit case on the suspected side, then go to Step 15. (See FRONT A/C UNIT REMOVAL/INSTALLATION.)
8*	INSPECT FRONT AIR MIX ACTUATOR POSITION SENSOR • Inspect the front air mix actuator position sensor on the suspected side. (See FRONT AIR MIX ACTUATOR INSPECTION.) • Is the front air mix actuator position sensor normal?	Yes	Go to the next step.
8*		No	Replace the front air mix actuator on the suspected side, then go to Step 15. (See FRONT AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
9*	INSPECT FRONT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO GROUND • Disconnect the front climate control unit connector. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) • Inspect for continuity between the following terminals (wiring harness-side) and body ground: Driver-side ― Front climate control unit terminal 2I Passenger-side ― Front climate control unit terminal 2K • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front air mix actuator terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 15.
9*		No	Go to the next step.
10*	INSPECT FRONT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR OPEN CIRCUIT • Front air mix actuator and front climate control unit connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): Driver-side ― Front climate control unit terminal 2I—front air mix actuator terminal B ― Front climate control unit terminal 1C—front air mix actuator terminal C ― Front climate control unit terminal 1Q—front air mix actuator terminal A Passenger-side ― Front climate control unit terminal 2K—front air mix actuator terminal B ― Front climate control unit terminal 1C—front air mix actuator terminal A ― Front climate control unit terminal 1Q—front air mix actuator terminal C • Is there continuity?	Yes	Go to the next step.
10*		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front air mix actuator terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 15.
11*	INSPECT FRONT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO POWER SUPPLY • Front air mix actuator and front climate control unit connectors are disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminals (wiring harness-side): Driver-side ― Front climate control unit terminal 2I Passenger-side ― Front climate control unit terminal 2K • Is the voltage 0 V?	Yes	Replace the front climate control unit, then go to Step 15. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)
11*		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front air mix actuator terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 15.
12*	INSPECT FRONT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO GROUND • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the front climate control unit connector. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) • Disconnect the front air mix actuator connector. (See FRONT AIR MIX ACTUATOR REMOVAL/INSTALLATION.) • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Front climate control unit terminal 1C ― Front climate control unit terminal 1Q • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and each actuator / sensor terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 15.
12*		No	Go to the next step.
13*	INSPECT FRONT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR OPEN CIRCUIT • Front air mix actuator and front climate control unit connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): Driver-side ― Front climate control unit terminal 1C—Front air mix actuator terminal C ― Front climate control unit terminal 1Q—Front air mix actuator terminal A Passenger-side ― Front climate control unit terminal 1C—Front air mix actuator terminal A ― Front climate control unit terminal 1Q—Front air mix actuator terminal C • Is there continuity?	Yes	Go to the next step.
13*		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front air mix actuator terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 15.
14*	INSPECT FRONT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO POWER SUPPLY • Front air mix actuator and front climate control unit connectors are disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the terminals (wiring harness-side): ― Front climate control unit terminal 1C ― Front climate control unit terminal 1Q • Is the voltage 0 V?	Yes	Replace the front climate control unit. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) Go to the next Step.
14*		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and each actuator / sensor terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to the next step.
15	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR • Can the temperatures for the driver-side and passenger-side be adjusted independently?	Yes	Troubleshooting completed. Explain repairs to customer.
15		No	Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.