Mazda CX 7. Manual - part 437

INSTRUMENTATION/DRIVER INFO. 

09-22–17

09-22

Check code 02

Check code 04

Check code 02

• Communication status to audio unit

• Communication status to climate control unit

• Communication status to instrument cluster

INSPECTION CONDITION

DISPLAY

ACTION

Select the check code 02.
(The diagnostic results will be 
displayed once each in the order 
of audio unit, heater control unit, 
and instrument cluster.)

All communications are normal.

Audio unit

Communication to audio unit is normal.

Communication error to audio unit. (DTC U0184)
(See 09-02D-7 DTC TABLE[MULTIPLEX 
COMMUNICATION SYSTEM])

Vehicle without audio unit.

Climate 
control unit

Communication to climate control unit is normal.

Communication error to climate control unit. (DTC 
U0166)
(See 09-02D-7 DTC TABLE[MULTIPLEX 
COMMUNICATION SYSTEM])

Vehicle without climate control unit.

Instrument 
cluster

Communication to instrument cluster is normal.

Communication error to instrument cluster. (DTC 
U0181)
(See 09-02D-7 DTC TABLE[MULTIPLEX 
COMMUNICATION SYSTEM])

Check code 04

TNS relay ON/OFF signal

STEP

INSPECTION 

CONDITION

DISPLAY

ACTION

1

Turn the headlight switch 
to the TNS position. (TNS 
relay ON)

Go to the next step.

Verify that the voltage of information display terminal C is B+.

• If the voltage is as specified, replace the information 

display.

• If the voltage is not as specified, inspect the following 

parts: 

— TNS relay

— Wiring harness (Battery— TNS relay— information 

display)

2

Turn the headlight switch 
off. (TNS relay OFF)

Verify that the voltage of the information display terminal C is 
1.0 V or less.

•  If the voltage is as specified, replace the information 

display.

• If the voltage is not as specified, inspect the following 

parts: 
— TNS relay

— Wiring harness (TNS relay— information display)

Input signal to the information display is normal.

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INSTRUMENTATION/DRIVER INFO. 

09-22–18

LCD

End Of Sie

Check code — 

LCD

DISPLAY

ACTION

All segments and dots illuminated.

LCD is normal.

Except above

Replace the information display.

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CONTROL SYSTEM 

09-40–1

09-40

2007 Mazda CX-7 Workshop Manual (1871–1U–06B)

Revised 9/2006 (Ref. No. R128/06) 

09-40

CONTROL SYSTEM

CONTROL SYSTEM 

LOCATION INDEX. . . . . . . . . . . . . . . . .  09-40–1

BODY CONTROL MODULE (BCM) 

REMOVAL/INSTALLATION. . . . . . . . . .  09-40–1

BODY CONTROL MODULE (BCM) 

INSPECTION . . . . . . . . . . . . . . . . . . . . .  09-40–2

Terminal Voltage Table (Reference)  . . . 09-40–2

STEERING ANGLE SENSOR 

INSPECTION  . . . . . . . . . . . . . . . . . . . . . 09-40–7

STEERING ANGLE SENSOR 

INITIALIZATION PROCEDURE . . . . . . . 09-40–8

End of Toc

WM: POWER SUPPLY SYSTEM

CONTROL SYSTEM LOCATION INDEX

id094000801000

.

End Of Sie

BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION

id094000800400

1. Disconnect the negative battery cable.

2. Remove the front scuff plate inner (LH). (See 09-17-19 FRONT SCUFF PLATE REMOVAL/INSTALLATION)

3. Remove the front side trim (LH). (See 09-17-18 FRONT SIDE TRIM REMOVAL/INSTALLATION)

4. Remove in the order indicated in the table.

.

5. Install in the reverse order of removal.

End Of Sie

1

BCM
 (See 09-40-1 BODY CONTROL MODULE (BCM) 
REMOVAL/INSTALLATION.)
 (See 09-40-2 BODY CONTROL MODULE (BCM) 
INSPECTION.)

2

Steering angle sensor
 (See 09-40-7 STEERING ANGLE SENSOR 
INSPECTION)
 (See 09-40-8 STEERING ANGLE SENSOR 
INITIALIZATION PROCEDURE.)

1

2

acxuuw00002223

1

Wiring harness

2

Bolt

3

Connector

4

BCM

4

3

3

1

2

2

acxuuw00001914

CONTROL SYSTEM 

09-40–2

2007 Mazda CX-7 Workshop Manual (1871–1U–06B)

BODY CONTROL MODULE (BCM) INSPECTION

id094000800300

1. Remove the glove compartment.
2. Remove the BCM with the connector connected.
3. Measure the voltage at each terminal and inspect for the continuity between the terminals and ground is as 

indicated in the Terminal Voltage Tables (Reference).

• If the voltage or continuity is not as specified in the Terminal Voltage Table (Reference), inspect the parts 

under “Inspection item (s)”.

— If the system does not work properly even though the parts or related wiring harnesses do not have any 

malfunction, replace the BCM.

Terminal Voltage Table (Reference)

3G

3E

3K

3I

3C

3A

3H

3F

3L

3J

3D

3B

3S

3Q

3W

3U

3O 3M

3T

3R

3X

3V

3P

3N

6E

6C

6A

6F

6D

6B

5B

5E

5D

5A

5F

5C

5Q

5K

5H

5AC

5N

5Z

5T

5W

5G

5O

5AA

5U

5X

5Y

5V

5S

5P

5M

5AD

5AB

5I

5J

5L

5R

4G

4I

4A

4H

4F

4J

4D

4B

1M

1O

1I

1D

1G

1E

1K

1B

1L

1F

1H

1J

1P

1A

1C

1N

acxuuw00002260

Termin

al

Signal

Connected to

Measurement condition

Voltage (V)/

Continuity

Inspection item (s)

1A

Hood latch 
switch signal

Hood latch 
switch

Hood open
 (Hood latch switch off)

5

• Hood latch switch

• Related wiring 

harnesses

Hood closed
 (Hood latch switch on)

1.0 or less

1B

CAN_H

— 

Because this terminal is for 
communication, good/no good 
judgment by terminal voltage is not 
possible.

— 

• Related wiring 

harnesses

1C

Parking brake 
switch signal

Parking brake 
switch

Ignition switch at 
ON

Parking brake 
switch on

1.0 or less

• Parking brake switch

• Related wiring 

harnesses

Parking brake 
switch off

B+

1D

CAN_L

— 

Because this terminal is for 
communication, good/no good 
judgment by terminal voltage is not 
possible.

— 

• Related wiring 

harnesses

1E

Brake fluid level 
signal

Brake fluid level 
sensor

Ignition switch at 
ON

Brake fluid level 
below MIN.

B+

• Brake fluid level sensor

• Related wiring 

harnesses

Brake fluid level 
above MIN.

1.0 or less

1F

— — 

— 

— 

— 

1G

Oil pressure 
switch signal

Oil pressure 
switch

Ignition switch at 
ON

Oil pressure 
switch on

1.0 or less

• Oil pressure switch

• Related wiring 

harnesses

Oil pressure 
switch off

B+

1H

Horn control

Horn relay

Transmitter LOCK button is pressed 
twice within 5 s.

B+ 

→ 1.0 or 

less 

→ B+

• Horn relay

• Related wiring 

harnesses

Other

B+

1I

Power supply

Main fuse block

Under any condition

B+

• Related wiring 

harnesses

1J

— — 

— 

— 

—