Mazda CX 7. Manual — part 298

CONTROL SYSTEM

07-40–17

07-40

Term

inal

Signal

name

Connected to

Measurement

condition

Voltage (V)

Inspection item (s)

A

Illumination
control

Instrument cluster

Headlight switch ON
and panel light control
switch at max

0.45

• Wiring harness: continuity (Climate

control unit— instrument cluster: A—
2H) (Instrument cluster— body ground:
2A— GND)

• Instrument cluster

Headlight switch ON
and panel light control
switch at min

9.96

• Wiring harness: short circuit (Climate

control unit— instrument cluster: A—
2H)

B

TNS signal

TNS relay

Headlight switch OFF

1.0 or less

• Wiring harness: short circuit (Climate

control unit— TNS relay: B— C)

• TNS relay

• Headlight switch

Headlight switch ON

B+

• Wiring harness: continuity, short circuit

(Climate control unit— TNS relay: B—
C)

• TNS relay

• Headlight switch

C

— —

— —

—

D

— —

— —

—

E

+5V

Airflow mode
actuator

IG SW ON

4.91

• Wiring harness: short circuit (Climate

control unit—airflow mode actuator: E—
B)

• Airflow mode actuator

• Climate control unit: terminal voltage (R,

L)

IG SW OFF

1.0 or less

• Climate control unit replacement

F

FAN ON/
OFF

Airflow volume
control dial

Airflow volume control
dial ON

0.06

• Wiring harness: (Climate control unit—

airflow volume control dial: F— C)

• Airflow volume control dial

Airflow volume control
dial OFF

12.18

• Wiring harness: continuity (Climate

control unit— airflow volume control
dial: F— C)

• Climate control unit: terminal voltage

(R)

• Airflow volume control dial

G

Potentiomet
er input

Airflow mode
actuator

VENT

4.20

• Wiring harness: continuity, short circuit

(Climate control unit— airflow mode
actuator: G— C)

• Airflow mode actuator

• Climate control unit: terminal voltage (E)

BILEVEL

3.34

HEAT

2.44

HEAT/DEF

1.56

DEFROSTER

0.68

H

Rear
window
defroster
switch

Rear window
defroster relay

Rear window defroster
switch OFF

B+

• Wiring harness: continuity, short circuit

(Climate control unit— rear window
defroster relay: H— E)

• Rear window defroster relay

Rear window defroster
switch ON

0.06

• Climate control unit: terminal voltage (L,

R)

• Climate control unit:

I

Evaporator
temperature
sensor input

Evaporator
temperature sensor

Compared with
temperature detected
by evaporator
temperature sensor

Refer to

graph 2

• Wiring harness: continuity (Climate

control unit—evaporator temperature
sensor: I—B, K—A)

• Wiring harness: short circuit (Climate

control unit—evaporator temperature
sensor: I—B)

• Evaporator temperature sensor

• Climate control unit: terminal voltage (L,

R)

J

A/C

BCM

A/C switch ON, airflow
volume control dial at
1st

0.03

• Wiring harness: continuity (Climate

control unit— BCM: J— 3V)

• BCM

A/C switch OFF

5.02

• Wiring harness: continuity, short circuit

(Climate control unit— BCM: J— 3V)

1871-1U-06B(07-40).fm 17 ページ ２００６年３月１６日 木曜日 午後４時１分

CONTROL SYSTEM

07-40–18

K

Sensor GND

• Evaporator

temperature
sensor

• Ambient

temperature
sensor

• Airflow mode

actuator

Under any condition

1.0 or less

• Climate control unit: terminal voltage (L)

L

GND

Body ground

Under any condition

1.0 or less

• Wiring harness: continuity (Climate

control unit— GND: L— GND)

M

— —

— —

—

N

— —

— —

—

O

— —

— —

—

P

B+

ROOM 15 A fuse

Under any condition

B+

• Wiring harness: continuity, short circuit

(Climate control unit— fuse: P—
ROOM 15 A)

• ROOM 15 A fuse

Q

Motor
operation

Airflow mode
actuator

Moving towards
DEFROSTER

10.60

• Wiring harness: continuity, short circuit

(Climate control unit— airflow mode
actuator: Q— F, S— D)

• Airflow mode actuator

Moving towards VENT

0.69

R

IG2

A/C 10 A fuse

IG SW ON

B+

• Wiring harness: continuity, short circuit

(Climate control unit— fuse: R— A/C
10 A)

• A/C 10 A fuse

IG SW OFF

1.0 or less

• Wiring harness: continuity, short circuit

(Climate control unit— fuse: R— A/C
10 A)

S

Motor
operation

Airflow mode
actuator

Moving towards VENT

10.64

• Wiring harness: continuity, short circuit

(Climate control unit— airflow mode
actuator: S— D, Q— F)

• Airflow mode actuator

Moving towards
DEFROSTER

0.68

T

— —

— —

—

U

— —

— —

—

V

Motor
operation

Air intake actuator

Moving towards
RECIRCULATE

10.62

• Wiring harness: continuity, short circuit

(Climate control unit— air intake
actuator: V— F, X— D)

• Air intake actuator

Moving towards
FRESH

0.66

W

Ambient
temperature
sensor input

Ambient
temperature sensor

Compared with
temperature detected
by ambient
temperature sensor

Refer to

graph 1

• Wiring harness: continuity (Climate

control unit—ambient temperature
sensor: W—B, K—A)

• Wiring harness: short circuit (Climate

control unit—ambient temperature
sensor: W—B)

• Ambient temperature sensor

• Climate control unit: terminal voltage (L,

R)

X

Motor
operation

Air intake actuator

Moving towards
FRESH

10.64

• Wiring harness: continuity, short circuit

(Climate control unit— air intake
actuator: X— D, V— F)

• Air intake actuator

Moving towards
RECIRCULATE

0.67

Term

inal

Signal

name

Connected to

Measurement

condition

Voltage (V)

Inspection item (s)

1871-1U-06B(07-40).fm 18 ページ ２００６年３月１６日 木曜日 午後４時１分

CONTROL SYSTEM

07-40–19

07-40

End Of Sie

WM: AIR MIX ACTUATOR

AIR MIX ACTUATOR REMOVAL/INSTALLATION

id074000802400

1. Disconnect the negative battery cable.
2. Remove the following parts:

(1) Console panel (See 09-17-15 CONSOLE PANEL REMOVAL/INSTALLATION.)
(2) Console (See 09-17-13 CONSOLE REMOVAL/INSTALLATION.)
(3) Front scuff plate inner (See 09-17-19 FRONT SCUFF PLATE REMOVAL/INSTALLATION.)
(4) Front side trim (See 09-17-18 FRONT SIDE TRIM REMOVAL/INSTALLATION.)
(5) Dashboard under cover
(6) Glove compartment (See 09-17-8 GLOVE COMPARTMENT REMOVAL/INSTALLATION.)
(7) Hood release lever (See 09-14-25 HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION.)
(8) Lower panel (See 09-17-9 LOWER PANEL REMOVAL/INSTALLATION.)
(9) Center panel (See 09-17-8 CENTER PANEL REMOVAL/INSTALLATION.)
(10)Audio unit (See 09-20-4 AUDIO UNIT REMOVAL/INSTALLATION.)
(11)Climate control unit (See 07-40-25 CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO

AIR CONDITIONER].) (See 07-40-25 CLIMATE CONTROL UNIT REMOVAL [MANUAL AIR
CONDITIONER].) (See 07-40-26 CLIMATE CONTROL UNIT INSTALLATION [MANUAL AIR
CONDITIONER].)

(12)Knee bolster (See 09-17-12 KNEE BOLSTER REMOVAL/INSTALLATION.)
(13)Meter hood (See 09-17-10 METER HOOD REMOVAL/INSTALLATION.)
(14)Column cover (See 09-17-8 COLUMN COVER REMOVAL/INSTALLATION.)
(15)Instrument cluster (See 09-22-2 INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
(16)Driver-side air bag module (See 08-10-6 DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)
(17)Steering wheel (See 06-14-6 STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
(18)Combination switch (See 09-18-13 COMBINATION SWITCH REMOVAL/INSTALLATION.)
(19)Steering shaft (See 06-14-6 STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
(20)A-pillar lower trim (See 09-17-16 A-PILLAR LOWER TRIM REMOVAL/INSTALLATION.)
(21)A-pillar trim (See 09-17-15 A-PILLAR TRIM REMOVAL/INSTALLATION.)
(22)Dashboard (See 09-17-4 DASHBOARD REMOVAL/INSTALLATION.)

3. Remove the blower motor. (See 07-40-8 BLOWER MOTOR REMOVAL/INSTALLATION.)
4. Remove the power MOS FET (Full-auto air conditioner) or resistor. (Manual air conditioner) (See 07-40-4

POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT TRANSISTOR (POWER MOS FET) REMOVAL/
INSTALLATION.) (See 07-40-7 RESISTOR REMOVAL/INSTALLATION.)

5. Remove the blower unit installation nuts.
6. Remove the screw securing the duct (2) to the A/C unit, by inserting a phillips screwdriver into the hole made

after removing the blower motor.

7. Remove the screw securing the duct (2) to the A/C unit.

-20

0

1

2

3

4

5

{-4}

{14}

{32}

{50}

{68}

{86} {104} {122}

-10

TEMPERATURE

V

O

LT

A

GE(V)

0

20

10

30

40

50

{ F}

C

Graph 1 (Ambient temperature sensor)

-20

0

1

2

3

4

5

{-4}

{14}

{32}

{50}

{68}

{86} {104} {122}

-10

TEMPERATURE

V

O

LT

A

GE(V)

0

20

10

30

40

50

{ F}

C

Graph 2 (Evaporetor temperature sensor)

1871-1U-06B(07-40).fm 19 ページ ２００６年３月１６日 木曜日 午後４時１分

CONTROL SYSTEM

07-40–20

8. Remove the duct (2).

9. Remove in the order indicated in the table.

10. Install in the duct (2).
11. Install the two outer screws, securing the duct (2)

to the A/C unit.

12. Install the screw on the end of the phillips

screwdriver with the packing tape.

Caution

• If the packing tape remains in the duct

(2), it may become a source of noise.
Wind up the packing tape to prevent
pinching when tightening the screw.

13. Install the duct (2) to the A/C unit by inserting a

phillips screwdriver, with the screw, into the hole
made after removing the blower motor.

14. Pull out the Phillips screwdriver together with the

packing tape.

15. Install in the reverse order of removal.

End Of Sie

1

Air mix actuator connector

2

Air mix actuator

INSTALLATION
HOLE OF THE
BLOWER MOTOR

DUCT (2)

SCREW

SCREW

SCREW

acxuuw00000738

1

2

acxuuw00000739

PACKING TAPE

PHILLIPS
SCREWDRIVER

SCREW

acxuuw00000740

1871-1U-06B(07-40).fm 20 ページ ２００６年３月１６日 木曜日 午後４時１分