NO.9 DUAL A/C CONTROL DOES NOT OPERATE [FULL-AUTO AIR CONDITIONER]

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2014 - Mazda6 - HVAC

NO.9 DUAL A/C CONTROL DOES NOT OPERATE [FULL-AUTO AIR CONDITIONER]

9	Dual A/C control function does not operate
DESCRIPTION	Driver or passenger side temperature control dial does not operate individually Temperature control operates normally except for dual A/C control function
POSSIBLE CAUSE	Driver-side air mix door malfunction (stuck) Passenger-side air mix door malfunction (stuck) Driver-side air mix actuator malfunction Passenger-side air mix actuator malfunction Driver-side air mix actuator position sensor malfunction Passenger-side air mix actuator position sensor malfunction Open, short circuit in wiring or poor connection between climate control unit and driver-side air mix actuator Open, short circuit in wiring or poor connection between climate control unit and passenger-side air mix actuator Open, short circuit in wiring or poor connection between climate control unit and driver-side air mix actuator position sensor Open, short circuit in wiring or poor connection between climate control unit and passenger-side air mix actuator position sensor 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.

Diagnostic procedure


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 AIR MIX ACTUATOR Inspect the air mix actuator on the suspect side. (See AIR MIX ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].) Is the air mix actuator normal?	Yes	Go to the next step.
3		No	Replace the suspect air mix actuator. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Then go to Step 15.
4*	INSPECT AIR MIX ACTUATOR (MOTOR) CIRCUIT FOR SHORT TO GROUND Disconnect the climate control unit connector. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Climate control unit terminal 2D (driver-side motor) Climate control unit terminal 2B (driver-side motor) Climate control unit terminal 2F (passenger-side motor) Climate control unit terminal 2H (passenger-side motor) 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 ground. 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 AIR MIX ACTUATOR (MOTOR) CIRCUIT FOR OPEN CIRCUIT Air mix actuator and climate control unit connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Climate control unit terminal 2D— driver-side air mix actuator terminal B Climate control unit terminal 2B — driver-side air mix actuator terminal C Climate control unit terminal 2F— passenger-side air mix actuator terminal C Climate control unit terminal 2H — passenger-side air mix actuator terminal B 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 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 AIR MIX ACTUATOR (MOTOR) CIRCUIT FOR SHORT TO POWER SUPPLY Air mix actuator and climate control unit connectors are disconnected. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off or on). Measure the voltage at the following terminals (wiring harness-side): Climate control unit terminal 2D (driver-side motor) Climate control unit terminal 2B (driver-side motor) Climate control unit terminal 2F (passenger-side motor) Climate control unit terminal 2H (passenger-side motor) 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 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 fan free of interference with the A/C unit case on the suspected side? Is the fan free of foreign matter and obstruction? Is the air mix door normal?	Yes	Replace the climate control unit, then go to Step 15. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
7		No	Remove the obstruction or replace A/C unit case on the suspected side, then go to Step 15.
8*	INSPECT AIR MIX ACTUATOR POSITION SENSOR Inspect the air mix actuator position sensor on the suspected side. Is the air mix actuator position sensor normal?	Yes	Go to the next step.
8*		No	Replace the air mix actuator on the suspected side, then go to Step 15.
9*	INSPECT AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO GROUND Disconnect the climate control unit connector. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Climate control unit terminal 2G (driver-side position sensor) Climate control unit terminal 2E (passenger-side position sensor) Climate control unit terminal 1N (position sensor power supply) Climate control unit terminal 1J (position sensor ground) 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 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 AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR OPEN CIRCUIT Air mix actuator and climate control unit connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Climate control unit terminal 2G — driver-side air mix actuator terminal F Climate control unit terminal 2E — passenger-side air mix actuator terminal F Climate control unit terminal 1N — driver-side air mix actuator terminal G Climate control unit terminal 1N — passenger-side air mix actuator terminal E Climate control unit terminal 1J — driver-side air mix actuator terminal E Climate control unit terminal 1J — passenger-side air mix actuator terminal G 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 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 AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO POWER SUPPLY Air mix actuator and climate control unit connectors are disconnected. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off or on). Measure the voltage at the following terminals (wiring harness-side): Climate control unit terminal 2G (driver-side position sensor) Climate control unit terminal 2E (passenger-side position sensor) Climate control unit terminal 1N (position sensor power supply) Climate control unit terminal 1J (position sensor ground) Is the voltage 0 V?	Yes	Go to the next step.
11*		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and 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 AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO GROUND Disconnect the climate control unit connector. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Climate control unit terminal 1N (position sensor power supply) Climate control unit terminal 1J (position sensor ground) 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 air mix actuator. 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 AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR OPEN CIRCUIT Air mix actuator and climate control unit connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Climate control unit terminal 1N — driver-side air mix actuator terminal G Climate control unit terminal 1N — passenger-side air mix actuator terminal E Climate control unit terminal 1J — driver-side air mix actuator terminal E Climate control unit terminal 1J — passenger-side air mix actuator terminal G 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 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 AIR MIX ACTUATOR (POSITION SENSOR) CIRCUIT FOR SHORT TO POWER SUPPLY Air mix actuator and climate control unit connectors are disconnected. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Switch the ignition ON (engine off or on). Measure the voltage at the following terminals (wiring harness-side): Climate control unit terminal 1N (position sensor power supply) Climate control unit terminal 1J (position sensor ground) Is the voltage 0 V?	Yes	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 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 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.

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