Control System (HVAC): Overview Mazda CX-9 I

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Scheme 4

1. Disconnect the negative battery cable.
2. Remove the dashboard under cover. (Passenger side). See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION».
3. Remove the glove compartment. See «GLOVE COMPARTMENT REMOVAL/INSTALLATION».
4. Insert a flathead screwdriver as shown in the figure and detach the fuse block tab by prying it in the direction of the arrow.
5. Press the fuse block and remove it from the bracket.
6. Set the fuse block out of the way.
7. Remove in the order indicated in the table.
8. Install in the reverse order of removal.

Scheme 5

Scheme 6

1. Connect battery positive voltage to air intake actuator terminal G, connect terminal A (or C) to ground, and then verify that the air intake actuator operates as shown in the table. If the operation condition is not normal, replace the air intake actuator. AIR INTAKE ACTUATOR OPERATION Terminal Air intake actuator operation A C G Ground - B+ RECIRCULATE --> FRESH - Ground B+ FRESH --> RECIRCULATE

Scheme 7

1. Disconnect the negative battery cable.
2. Remove the following parts: Dashboard under cover (Driver side). See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION». Side wall. See «SIDE WALL REMOVAL/INSTALLATION». Console panel (LH). See «CONSOLE PANEL REMOVAL/INSTALLATION». Hood release lever. See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION». Lower panel. See «LOWER PANEL REMOVAL/INSTALLATION».
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

Scheme 8

1. Disconnect the negative battery cable.
2. Remove the following parts: Decoration panel. See «DECORATION PANEL REMOVAL/INSTALLATION». Front console box mat. See «FRONT CONSOLE BOX MAT REMOVAL/INSTALLATION». Indicator panel. See «INDICATOR PANEL REMOVAL/INSTALLATION». Front console box. See «FRONT CONSOLE BOX REMOVAL/INSTALLATION». Dashboard under cover. See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION». Side wall. See «SIDE WALL REMOVAL/INSTALLATION». Console panel. See «CONSOLE PANEL REMOVAL/INSTALLATION». Console cover. See «CONSOLE COVER REMOVAL/INSTALLATION». Console. See «CONSOLE REMOVAL/INSTALLATION». Front scuff plate inner. See «FRONT SCUFF PLATE REMOVAL/INSTALLATION». Front side trim. See «FRONT SIDE TRIM REMOVAL/INSTALLATION». Glove compartment. See «GLOVE COMPARTMENT REMOVAL/INSTALLATION». Hood release lever. See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION». Lower panel. See «LOWER PANEL REMOVAL/INSTALLATION». Lower column cover. See «COLUMN COVER REMOVAL/INSTALLATION». Driver-side air bag module. See «DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION». Steering wheel. See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION». Combination switch. See «COMBINATION SWITCH REMOVAL/INSTALLATION». Center panel. See «CENTER PANEL REMOVAL/INSTALLATION». Meter hood. See «METER HOOD REMOVAL/INSTALLATION». Instrument cluster. See «INSTRUMENT CLUSTER REMOVAL/INSTALLATION». Audio unit. See «AUDIO UNIT REMOVAL/INSTALLATION». Steering shaft. See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION». A-pillar trim. See «A-PILLAR TRIM REMOVAL/INSTALLATION». Side panel. See «SIDE PANEL REMOVAL/INSTALLATION».
3. Disconnect the front door wiring harness connector (Driver side). See «FRONT DOOR MODULE REMOVAL/INSTALLATION».
4. Disconnect the dashboard harness connectors.
5. Remove the brake switch from the brake pedal with the brake switch connector connected. See «BRAKE PEDAL REMOVAL/INSTALLATION».
6. Remove the selector lever component. See «SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION».
7. Remove the windshield wiper arm and blade. See «WINDSHIELD WIPER ARM AND BLADE REMOVAL/INSTALLATION».
8. Remove the cowl grille. See «COWL GRILLE REMOVAL/INSTALLATION».
9. Remove the windshield wiper motor. See «WINDSHIELD WIPER MOTOR REMOVAL/INSTALLATION».
10. Remove the dashboard. See «DASHBOARD REMOVAL/INSTALLATION».
11. Remove in the order indicated in the table.
12. Install in the reverse order of removal.

Scheme 9

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Scheme 11

1. Connect battery positive voltage to front air mix actuator terminal F (or G), connect terminal G (or F) to ground, and then verify that the front air mix actuator operates as shown in the table. If the operation condition is not normal, replace the front air mix actuator. FRONT AIR MIX ACTUATOR OPERATION Terminal Front air mix actuator operation F G B+ Ground HOT --> COLD Ground B+ COLD --> HOT
2. Verify that the resistance between terminals A and E, and E and C matches the front air mix actuator operation as shown in the graph. If the operation condition and resistance are not normal, replace the front air mix actuator.

Scheme 12

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Scheme 14

1. Connect battery positive voltage to front air mix actuator terminal F (or G), connect terminal G (or F) to ground, and then verify that the front air mix actuator operates as shown in the table. If the operation condition is not normal, replace the front air mix actuator. FRONT AIR MIX ACTUATOR OPERATION Terminal Front air mix actuator operation F G B+ Ground COLD --> HOT Ground B+ HOT --> COLD
2. Verify that the resistance between terminals A and E, and E and C matches the front air mix actuator operation as shown in the graph. If the operation condition and resistance are not normal, replace the front air mix actuator.

Scheme 15

1. Slide the passenger-side front seat to the maximum forward end.
2. Disconnect the negative battery cable.
3. Remove the following parts: Decoration panel. See «DECORATION PANEL REMOVAL/INSTALLATION». Front console box mat. See «FRONT CONSOLE BOX MAT REMOVAL/INSTALLATION». Indicator panel. See «INDICATOR PANEL REMOVAL/INSTALLATION». Front console box. See «FRONT CONSOLE BOX REMOVAL/INSTALLATION». Dashboard under cover. See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION». Side wall. See «SIDE WALL REMOVAL/INSTALLATION». Console panel. See «CONSOLE PANEL REMOVAL/INSTALLATION». Console cover. See «CONSOLE COVER REMOVAL/INSTALLATION». Console. See «CONSOLE REMOVAL/INSTALLATION».
4. Remove in the order indicated in the table.
5. Install in the reverse order of removal.

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Scheme 18

1. Connect battery positive voltage to rear air mix actuator terminal F (or G), connect terminal G (or F) to ground, and then verify that the rear air mix actuator operates as shown in the table. If the operation condition is not normal, replace the rear air mix actuator. REAR AIR MIX ACTUATOR OPERATION Terminal Rear air mix actuator operation F G B+ Ground HOT --> COLD Ground B+ COLD --> HOT
2. Verify that the resistance between the terminals C and E, and E and A matches the rear air mix actuator operation as shown in the graph. If the operation condition and resistance are not normal, replace the rear air mix actuator.

Scheme 19

1. Disconnect the negative battery cable.
2. Remove the following parts: Decoration panel. See «DECORATION PANEL REMOVAL/INSTALLATION». Front console box mat. See «FRONT CONSOLE BOX MAT REMOVAL/INSTALLATION». Indicator panel. See «INDICATOR PANEL REMOVAL/INSTALLATION». Front console box. See «FRONT CONSOLE BOX REMOVAL/INSTALLATION». Dashboard under cover. See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION». Side wall. See «SIDE WALL REMOVAL/INSTALLATION». Console panel. See «CONSOLE PANEL REMOVAL/INSTALLATION». Console cover. See «CONSOLE COVER REMOVAL/INSTALLATION». Console. See «CONSOLE REMOVAL/INSTALLATION». Front scuff plate inner. See «FRONT SCUFF PLATE REMOVAL/INSTALLATION». Front side trim. See «FRONT SIDE TRIM REMOVAL/INSTALLATION». Glove compartment. See «GLOVE COMPARTMENT REMOVAL/INSTALLATION». Hood release lever. See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION». Lower panel. See «LOWER PANEL REMOVAL/INSTALLATION». Lower column cover. See «COLUMN COVER REMOVAL/INSTALLATION». Driver-side air bag module. See «DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION». Steering wheel. See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION». Combination switch. See «COMBINATION SWITCH REMOVAL/INSTALLATION». Center panel. See «CENTER PANEL REMOVAL/INSTALLATION». Meter hood. See «METER HOOD REMOVAL/INSTALLATION». Instrument cluster. See «INSTRUMENT CLUSTER REMOVAL/INSTALLATION». Audio unit. See «AUDIO UNIT REMOVAL/INSTALLATION». Steering shaft. See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION». A-pillar trim. See «A-PILLAR TRIM REMOVAL/INSTALLATION». Side panel. See «SIDE PANEL REMOVAL/INSTALLATION».
3. Disconnect the front door wiring harness connector (Driver side). See «FRONT DOOR MODULE REMOVAL/INSTALLATION».
4. Disconnect the dashboard harness connectors.
5. Remove the brake switch from the brake pedal with the brake switch connector connected. See «BRAKE PEDAL REMOVAL/INSTALLATION».
6. Remove the selector lever component. See «SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION».
7. Remove the windshield wiper arm and blade. See «WINDSHIELD WIPER ARM AND BLADE REMOVAL/INSTALLATION».
8. Remove the cowl grille. See «COWL GRILLE REMOVAL/INSTALLATION».
9. Remove the windshield wiper motor. See «WINDSHIELD WIPER MOTOR REMOVAL/INSTALLATION».
10. Remove the dashboard. See «DASHBOARD REMOVAL/INSTALLATION».
11. Remove in the order indicated in the table.
12. Install in the reverse order of removal.

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Scheme 22

1. Connect battery positive voltage to front airflow mode actuator terminal F (or G), connect terminal G (or F) to ground, and then verify that the front airflow mode actuator operates as shown in the table. If the operation condition is not normal, replace the front airflow mode actuator. FRONT AIRFLOW MODE ACTUATOR OPERATION Terminal Front airflow mode actuator operation F G B+ Ground VENT --> DEFROSTER Ground B+ DEFROSTER --> VENT
2. Verify that the resistance between terminals C and E, and E and A matches the front airflow mode actuator operation as shown in the graph. If the operation condition and resistance are not normal, replace the front airflow mode actuator.

Scheme 23

1. Slide the passenger-side front seat to the maximum forward end.
2. Disconnect the negative battery cable.
3. Remove the following parts: Decoration panel. See «DECORATION PANEL REMOVAL/INSTALLATION». Front console box mat. See «FRONT CONSOLE BOX MAT REMOVAL/INSTALLATION». Indicator panel. See «INDICATOR PANEL REMOVAL/INSTALLATION». Front console box. See «FRONT CONSOLE BOX REMOVAL/INSTALLATION». Dashboard undercover. See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION». Side wall. See «SIDE WALL REMOVAL/INSTALLATION». Console panel. See «CONSOLE PANEL REMOVAL/INSTALLATION». Console cover. See «CONSOLE COVER REMOVAL/INSTALLATION». Console. See «CONSOLE REMOVAL/INSTALLATION».
4. Remove in the order indicated in the table.
5. Install in the reverse order of removal.

Scheme 24

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Scheme 26

1. Connect battery positive voltage to rear airflow mode actuator terminal F (or G), connect terminal G (or F) to ground, and then verify that the rear airflow mode actuator operates as shown in the table. If the operation condition is not normal, replace the rear airflow mode actuator. REAR AIRFLOW MODE ACTUATOR OPERATION Terminal Rear airflow mode actuator operation F G B+ Ground VENT --> HEAT Ground B+ HEAT --> VENT
2. Verify that the resistance between terminals A and E, and E and C matches the rear airflow mode actuator operation as shown in the graph. If the operation condition and resistance are not normal, replace the rear airflow mode actuator.

Scheme 27

1. Disconnect the negative battery cable.
2. Remove the dashboard under cover, (passenger side). See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION».
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

Scheme 28

1. Connect battery positive voltage to front blower motor terminal B, connect terminal A to ground, and then verify its operation. If there is any malfunction, replace the front blower motor.

Scheme 29

1. Disconnect the negative battery cable.
2. Remove the following parts: Decoration panel. See «DECORATION PANEL REMOVAL/INSTALLATION». Front console box mat. See «FRONT CONSOLE BOX MAT REMOVAL/INSTALLATION». Indicator panel. See «INDICATOR PANEL REMOVAL/INSTALLATION». Front console box. See «FRONT CONSOLE BOX REMOVAL/INSTALLATION». Dashboard under cover. See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION». Side wall. See «SIDE WALL REMOVAL/INSTALLATION». Console panel. See «CONSOLE PANEL REMOVAL/INSTALLATION». Console cover. See «CONSOLE COVER REMOVAL/INSTALLATION». Console. See «CONSOLE REMOVAL/INSTALLATION». Selector lever component. See «SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION».
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

Scheme 30

1. Connect battery positive voltage to rear blower motor terminal B, connect terminal A to ground, and then verify its operation. If there is any malfunction, replace the rear blower motor.

Scheme 31

Scheme 32

1. Disconnect the negative battery cable.
2. Remove the dashboard under cover, (passenger side). See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION».
3. Remove the glove compartment. See «GLOVE COMPARTMENT REMOVAL/INSTALLATION».
4. Insert a flathead screwdriver as shown in the figure and detach the fuse block tab by prying it in the direction of the arrow.
5. Press the fuse block and remove it from the bracket.
6. Set the fuse block out of the way.
7. Remove in the order indicated in the table.
8. Install in the reverse order of removal.

Scheme 33

1. Verify that the continuity between the front power MOS FET terminals is as indicated in the table. If there is any malfunction, replace the front power MOS FET. If the blower motor operation is not normal even though no malfunction can be verified, inspect the front climate control unit. FRONT POWER MOS FET TERMINALS CONTINUITY CHART Tester lead Resistance (kilohm) + - A B 2.2 A E Continuity detected A F Continuity detected B A 2.2 B E Continuity detected B F Continuity detected E A infinity E B infinity E F 11 F A infinity F B infinity F E 11

Scheme 34

1. Disconnect the negative battery cable.
2. Remove the following parts: Decoration panel. See «DECORATION PANEL REMOVAL/INSTALLATION». Front console box mat. See «FRONT CONSOLE BOX MAT REMOVAL/INSTALLATION». Indicator panel. See «INDICATOR PANEL REMOVAL/INSTALLATION». Front console box. See «FRONT CONSOLE BOX REMOVAL/INSTALLATION». Dashboard under cover. See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION». Side wall. See «SIDE WALL REMOVAL/INSTALLATION». Console panel. See «CONSOLE PANEL REMOVAL/INSTALLATION». Console cover. See «CONSOLE COVER REMOVAL/INSTALLATION». Console. See «CONSOLE REMOVAL/INSTALLATION».
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

Scheme 35

1. Verify that the continuity between the rear power MOS FET terminals is as indicated in the table. If there is any malfunction, replace the rear power MOS FET. If the blower motor operation is not normal even though no malfunction can be verified, inspect the front climate control unit. REAR POWER MOS FET TERMINALS CONTINUITY CHART Tester lead Resistance (kilohm) + - A B infinity A C 11 A D infinity B A Continuity detected B C Continuity detected B D 1.5 C A 11 C B infinity C D infinity D A Continuity detected D B 1.5 D C Continuity detected

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Scheme 38

1. Install the SST (49 L061 001) or a commercially available filter wrench as shown in the figure and remove the bolt. When Using SST When Using Filter Wrench
2. Insert an appropriate bolt into the pressure plate thread hole and tighten it until the pressure plate is removed.
3. Disassemble in the order indicated in the table.
4. Assemble in the reverse order of disassembly.
5. Adjust the magnetic clutch clearance. See «MAGNETIC CLUTCH ADJUSTMENT».

Scheme 39

1. Install the snap ring so that the tapered area is on the pressure plate side.

Scheme 40

1. Secure the A/C compressor to the vise.
2. Secure the magnet base to the vise and install the dial gauge to the position shown in the figure.
3. Set the dial gauge to 0.
4. Connect battery voltage to stator terminal A and the A/C compressor body to ground to operate the magnet clutch.
5. Verify that the dial gauge graduation is within the standard. If the clearance is not within the specification, adjust the clearance by changing the type or number of shims. Magnetic clutch clearance 0.35-0.65 mm {0.014-0.025 in}

Scheme 41

Scheme 42

1. Connect battery positive voltage to magnetic clutch terminal A, connect terminal B to ground.
2. Verify that the magnetic clutch operates. If there is any malfunction, replace the magnetic clutch.

Scheme 43

1. Disconnect the negative battery cable.
2. Remove the cover from the dashboard using a fiathead screwdriver wrapped with protective tape.
3. Detach the solar radiation sensor connector tab in the position shown in the figure and disconnect the solar radiation sensor connector.
4. Press the solar radiation sensor tab and remove the solar radiation sensor from the cover.
5. Install in the reverse order of removal.

Scheme 44

1. Using a tester, connect the positive (+) lead to solar radiation sensor terminal A, the negative (-) lead to terminal B or C, then measure the resistance. If the resistance is not normal, replace the solar radiation sensor. Resistance except infinity ohms
2. Block the light to the solar radiation sensor, connect the positive (+) lead of a tester to solar radiation sensor terminal B or C and negative (-) lead to terminal A, then measure the resistance. If the resistance is not normal, replace the solar radiation sensor. Resistance infinity ohms (no continuity)
3. Expose the solar radiation sensor to natural sunlight.
4. Using a tester, connect the positive (+) lead to solar radiation sensor terminal B or C, the negative (-) lead to terminal A, then measure the resistance. If the resistance is not normal, replace the solar radiation sensor. Resistance except infinity ohms

Scheme 45

1. Disconnect the negative battery cable.
2. Remove the under cover.
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.

Scheme 46

1. Measure the temperature around the ambient temperature sensor and measure the resistance between the ambient temperature sensor terminal. If the characteristics of the ambient temperature sensor are not as shown in the graph, replace the ambient temperature sensor.

Scheme 47

1. Disconnect the negative battery cable.
2. Remove the following parts: Dashboard under cover (Driver side). See «DASHBOARD UNDER COVER REMOVAL/INSTALLATION». Side wall. See «SIDE WALL REMOVAL/INSTALLATION». Console panel (LH). See «CONSOLE PANEL REMOVAL/INSTALLATION». Hood release lever. See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION». Lower panel. See «LOWER PANEL REMOVAL/INSTALLATION».
3. Remove the screw.
4. Remove the cabin temperature sensor cover in the direction of the arrow.
5. Remove the cabin temperature sensor.
6. Install in the reverse order of removal.

Scheme 48

1. Measure the temperature around the cabin temperature sensor and measure the resistance between cabin temperature sensor terminal. If the characteristics of the cabin temperature sensor are not as shown in the graph, replace the cabin temperature sensor.

See also:
• REFRIGERANT RECOVERY
• REFRIGERANT CHARGING
• REFRIGERANT SYSTEM PERFORMANCE TEST