Mazda CX 7. Manual - part 280

ON-BOARD DIAGNOSTIC 

07-02–7

07-02

DTC B1274, B1275

id070200800800

Diagnostic Procedure

End Of Sie

DTC B1274, 

B1275

Airflow mode actuator (potentiometer) system

POSSIBLE 

CAUSE

• Airflow mode actuator malfunction

• Open circuit in wiring harness between climate control unit and airflow mode actuator

• Short circuit in wiring harness between climate control unit (terminal P) and airflow mode actuator 

(terminal C)

STEP

INSPECTION

ACTION

1

• Inspect the airflow mode actuator. (See 07-40-11 

AIRFLOW MODE ACTUATOR INSPECTION.)

• Is it normal?

Yes

Go to the next step.

No

Replace the airflow mode actuator. (See 07-40-10 
AIRFLOW MODE ACTUATOR REMOVAL/
INSTALLATION.)

2

• Disconnect the climate control unit connector and 

the airflow mode actuator connector.

• Is there an open circuit in the wiring harness 

between the following terminals of the climate 
control unit and the airflow mode actuator?
— J— B

— P— C

— C— A

Yes

Repair the wiring harness.

No

Go to the next step.

3

• Is there a short circuit to ground in the wiring 

harness between climate control unit terminal P 
and airflow mode actuator terminal C?

Yes

Repair the wiring harness.

No

The system is normal at present. (Clear the malfunction 
from the memory.)

CLIMATE CONTROL UNIT CONNECTOR

AIRFLOW MODE ACTUATOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

C

D

F

*

H

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ON-BOARD DIAGNOSTIC 

07-02–8

DTC B1282, B1283

id070200800900

Diagnostic Procedure

End Of Sie

DTC B1947, B2014

id070200801000

Diagnostic Procedure

DTC B1282, 

B1283

Air mix actuator (potentiometer) system

POSSIBLE 

CAUSE

• Air mix actuator malfunction

• Open circuit in wiring harness between climate control unit and air mix actuator

• Short circuit in wiring harness between climate control unit (terminal N) and air mix actuator (terminal 

C)

STEP

INSPECTION

ACTION

1

• Inspect the air mix actuator. (See 07-40-21 AIR 

MIX ACTUATOR INSPECTION.)

• Is it normal?

Yes

Go to the next step.

No

Replace the air mix actuator. (See 07-40-19 AIR MIX 
ACTUATOR REMOVAL/INSTALLATION.)

2

• Disconnect the climate control unit connector and 

the air mix actuator connector.

• Is there an open circuit in the wiring harness 

between the following terminals of the climate 
control unit and the air mix actuator?

— J— A

— N— C

— C— B

Yes

Repair the wiring harness.

No

Go to the next step.

3

• Is there a short circuit to ground in the wiring 

harness between climate control unit terminal N 
and air mix actuator terminal C?

Yes

Repair the wiring harness.

No

The system is normal at present. (Clear the malfunction 
from the memory.)

CLIMATE CONTROL UNIT CONNECTOR

AIR MIX ACTUATOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

C

D

F

*

H

DTC B1947, 

B2014

Evaporator temperature sensor system

POSSIBLE 

CAUSE

• Evaporator temperature sensor malfunction

• Open or short circuit in wiring harness between climate control unit and evaporator temperature sensor

STEP

INSPECTION

ACTION

1

• Inspect the evaporator temperature sensor. (See 

07-40-9 EVAPORATOR TEMPERATURE 
SENSOR INSPECTION.)

• Is it normal?

Yes

Go to the next step.

No

Replace the evaporator temperature sensor. (See 07-
40-8 EVAPORATOR TEMPERATURE SENSOR 
REMOVAL/INSTALLATION.)

2

• Disconnect the climate control unit connector and 

the evaporator temperature sensor connector.

• Is there an open circuit in the wiring harness 

between the following terminals of the climate 
control unit and the evaporator temperature 
sensor?

— F— B

— C— A

Yes

Repair the wiring harness.

No

Go to the next step.

3

• Is there a short circuit to ground in the wiring 

harness between climate control unit terminal F 
and evaporator temperature sensor terminal B?

Yes

Repair the wiring harness.

No

Connect the climate control unit connector, then go to 
the next step.

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ON-BOARD DIAGNOSTIC 

07-02–9

07-02

End Of Sie

DTC B2832

id070200801100

Diagnostic Procedure

End Of Sie

4

• Turn the ignition switch to the ON position.

• Inspect the voltage at the following climate control 

unit terminal (wiring harness-side).
— Terminal F (evaporator temperature sensor 

input signal)

• Is the voltage normal? (Approx. 5 V)

Yes

The system is normal at present. (Clear the malfunction 
from the memory.)

No

Inspect the connection of the climate control unit 
connector. (See 07-40-13 CLIMATE CONTROL UNIT 
INSPECTION [FULL-AUTO AIR CONDITIONER].)

STEP

INSPECTION

ACTION

CLIMATE CONTROL UNIT CONNECTOR

EVAPORATOR TEMPERATURE SENSOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

H

DTC B2832

Airflow mode actuator (motor lock) system

Note

• DTC B2832 will be detected when the ignition switch is turned to the ON position and approx. 

30 s have passed since the mode actuator is operated.

POSSIBLE 

CAUSE

• Airflow mode actuator malfunction

• A/C unit (airflow mode link and airflow mode crank) malfunction

• Open or short circuit in wiring harness between climate control unit and airflow mode actuator

STEP

INSPECTION

ACTION

1

• Disconnect the airflow mode actuator connector.

• Connect battery positive voltage to airflow mode 

actuator terminal D (or terminal F) and terminal F 
(or terminal D) to ground.

• Does the airflow mode actuator operate?

Yes

Connect the connector, then go to Step 3.

No

Go to the next step.

2

• Remove the airflow mode actuator.

• Operate the airflow mode main link manually.

• Does the airflow mode main link operate 

smoothly?

Yes

Replace the airflow mode actuator. (See 07-40-10 
AIRFLOW MODE ACTUATOR REMOVAL/
INSTALLATION.)

No

Replace the airflow mode main link, airflow mode sub 
link, and the airflow mode crank.

3

• Disconnect the climate control unit connector.

• Connect battery positive voltage to climate control 

unit terminal O (or terminal Q) and terminal Q (or 
terminal O) to ground.

• Does the airflow mode actuator operate?

Yes

Inspect the connection of the climate control unit 
connector. (See 07-40-13 CLIMATE CONTROL UNIT 
INSPECTION [FULL-AUTO AIR CONDITIONER].)

No

Repair the wiring harness.

4

• Turn the ignition switch to the ON position.

• Press the MODE switch to change the mode 

(operate the airflow mode actuator) and wait for 30 
s or more.

• Perform the DTC inspection.Is DTC B2832 

indicated? 

Yes

Recheck malfunction symptoms, then repeat from Step 
1 if the malfunction recurs.

No

DTC troubleshooting completed.

CLIMATE CONTROL UNIT CONNECTOR

AIRFLOW MODE ACTUATOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

C

D

F

*

H

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ON-BOARD DIAGNOSTIC 

07-02–10

DTC B2834

id070200801200

Diagnostic Procedure

End Of Sie

A/C OPERATION CHECK MODE

id070200801300

*

: Shown on the information display (at the set temperature display) according to each M-MDS display.

DTC B2834

Air mix actuator (motor lock) system

Note

• DTC B2834 will be detected when the ignition switch is turned to the ON position and approx. 

30 s have passed since the mode actuator is operated.

POSSIBLE 

CAUSE

• Air mix actuator malfunction

• A/C unit (air mix link and air mix crank) malfunction

• Open or short circuit in wiring harness between climate control unit and air mix actuator

STEP

INSPECTION

ACTION

1

• Disconnect the air mix actuator connector.

• Connect battery positive voltage to air mix actuator 

terminal F (or terminal D) and terminal D (or 
terminal F) to ground.

• Does the air mix actuator operate?

Yes

Connect the connector, then go to Step 3.

No

Go to the next step.

2

• Remove the air mix actuator.

• Operate the air mix link manually.

• Does the air mix link operate smoothly?

Yes

Replace the air mix actuator. (See 07-40-19 AIR MIX 
ACTUATOR REMOVAL/INSTALLATION.)

No

Replace the air mix link and the air mix crank.

3

• Disconnect the climate control unit connector.

• Connect battery positive voltage to climate control 

unit terminal S (or terminal U) and terminal U (or 
terminal S) to ground.

• Does the air mix actuator operate?

Yes

Inspect the connection of the climate control unit 
connector. (See 07-40-13 CLIMATE CONTROL UNIT 
INSPECTION [FULL-AUTO AIR CONDITIONER].)

No

Repair the wiring harness.

4

• Turn the ignition switch to the ON position.

• Turn the temperature setting dial to change the set 

temperature (operate the air mix actuator) and wait 
for 30 s or more.

• Perform the DTC inspection.Is DTC B2834 

indicated? 

Yes

Recheck malfunction symptoms, then repeat from Step 
1 if the malfunction recurs.

No

DTC troubleshooting completed.

CLIMATE CONTROL UNIT CONNECTOR

AIR MIX ACTUATOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

C

D

F

*

H

M-MDS display

Target part

Operation condition

Illumination Of All 
Indicator lights

Climate control unit

All A/C indicator lights illuminated

Blower Motor Speed

Blower motor

Air mix Actuator

Air mix door

Airflow Mode Actuator

Airflow mode door

Air Intake Actuator / Air 
conditioning compressor

Air intake door
A/C compressor

FRESH 

⇔ REC

ON 

⇔ OFF

→

→

→

→

→

→

→

OFF

1ST

2ND

3RD

4TH

5TH

6TH

7TH

→

→

→

0 %

50 % 100 %

50 %

→

→

→

→

VENT

BI-LEVEL

HEAT

HEAT/DEF

DEFROSTER

1871-1U-06B(07-02).fm  10 ページ  ２００６年３月１６日　木曜日　午後４時２２分