Mazda CX 7. Manual - part 346

ON-BOARD DIAGNOSTIC [BCM]

09-02F–19

09-02F

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT FRONT DOOR LATCH AND LOCK 
ACTUATOR (DRIVER-SIDE) CONNECTOR

• Disconnect the front door latch and lock 

actuator (driver-side) connector.

• Inspect the front door latch and lock actuator 

(driver-side) connector terminals for poor 
connection (such as damaged/pulled-out 
pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 5.

No

Go to the next step.

2

INSPECT BCM CONNECTOR

• Disconnect the BCM connector.

• Inspect the BCM connector terminals for 

poor connection (such as damaged/pulled-
out pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 5.

No

Go to the next step.

3

INSPECT FRONT DOOR LATCH AND LOCK 
ACTUATOR (DRIVER-SIDE) SIGNAL CIRCUIT 
FOR SHORT TO GND

• Inspect for continuity between BCM terminal 

5G (wiring harness-side) and body GND.

• Is there continuity?

Yes

Repair or replace the wiring harness for a possible short to 
GND, then go to Step 5.

No

Go to the next step.

4

INSPECT FRONT DOOR LATCH AND LOCK 
ACTUATOR (DRIVER-SIDE)

• Inspect the front door latch and lock actuator 

(driver-side).
 (See 09-14-6 FRONT DOOR LATCH AND 
LOCK ACTUATOR INSPECTION.)

• Is there any malfunction?

Yes

Replace the front door latch and lock actuator (driver-side), 
then go to the next step.
 (See 09-14-5 FRONT DOOR LATCH AND LOCK 
ACTUATOR REMOVAL/INSTALLATION.)

No

Go to the next step.

5

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear the DTC from the BCM memory using 

the M-MDS.

• Perform the self-test.

 (See 09-02F-26 BCM SELF-TEST[BCM].)

• Is the same DTC present?

Yes

Replace the BCM.
 (See 09-40-1 BODY CONTROL MODULE (BCM) 
REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

1871-1U-06B(09-02F).fm  19 ページ  ２００６年３月１５日　水曜日　午前１１時４１分

ON-BOARD DIAGNOSTIC [BCM]

09-02F–20

DTC B2721[BCM]

id0902f5833300

Diagnostic procedure

End Of Sie

DTC B2721

Liftgate ajar output short to ground

DETECTION 
CONDITION

Short to GND in wiring harness between BCM and liftgate latch switch

POSSIBLE 
CAUSE

• Short to GND in wiring harness between BCM terminal 5P and liftgate latch switch terminal B

• Liftgate latch switch malfunction

• BCM malfunction

STEP

INSPECTION

ACTION

1

INSPECT LIFTGATE LATCH SWITCH 
CONNECTOR

• Disconnect the liftgate latch switch 

connector.

• Inspect the liftgate latch switch connector 

terminals for poor connection (such as 
damaged/pulled-out pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 5.

No

Go to the next step.

2

INSPECT BCM CONNECTOR

• Disconnect the BCM connector.

• Inspect the BCM connector terminals for 

poor connection (such as damaged/pulled-
out pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 5.

No

Go to the next step.

3

INSPECT LIFTGATE LATCH SWITCH SIGNAL 
CIRCUIT FOR SHORT TO GND

• Inspect for continuity between BCM terminal 

5P (wiring harness-side) and body GND.

• Is there continuity?

Yes

Repair or replace the wiring harness for a possible short to 
GND, then go to Step 5.

No

Go to the next step.

4

INSPECT LIFTGATE LATCH SWITCH

• Inspect the liftgate latch switch.

 (See 09-14-10 LIFTGATE LATCH SWITCH 
INSPECTION.)

• Is there any malfunction?

Yes

Replace the liftgate latch switch, then go to the next step.
 (See 09-14-10 LIFTGATE LATCH AND LOCK ACTUATOR 
REMOVAL/INSTALLATION.)

No

Go to the next step.

5

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear the DTC from the BCM memory using 

the M-MDS.

• Perform the self-test.

 (See 09-02F-26 BCM SELF-TEST[BCM].)

• Is the same DTC present?

Yes

Replace the BCM.
 (See 09-40-1 BODY CONTROL MODULE (BCM) 
REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

BCM

LIFTGATE LATCH 

SWITCH

A

5P

B

LIFTGATE LATCH SWITCH WIRING 

HARNESS-SIDE CONNECTOR

BCM WIRING HARNESS-SIDE 

CONNECTOR

5Q

5K

5B

5E

5H

5AC

5N

5Z

5T

5W

5G

5D

5A

5O

5AA

5U

5X

5Y

5V

5S

5P

5M

5AD

5AB

5I

5F

5J

5C

5L

5R

1871-1U-06B(09-02F).fm  20 ページ  ２００６年３月１５日　水曜日　午前１１時４１分

ON-BOARD DIAGNOSTIC [BCM]

09-02F–21

09-02F

DTC B2982[BCM]

id0902f5838300

Diagnostic procedure

DTC B2982

Park brake switch circuit open

DETECTION 
CONDITION

Open circuit in wiring harness between BCM and parking brake switch

POSSIBLE 
CAUSE

• Open circuit in wiring harness between BCM terminal 1C and parking brake switch terminal A

• Parking brake switch malfunction

• BCM malfunction

STEP

INSPECTION

ACTION

1

INSPECT PARKING BRAKE SWITCH 
CONNECTOR

• Turn the ignition switch off.

• Disconnect the parking brake switch 

connector.

• Inspect the parking brake switch connector 

terminals for poor connection (such as 
damaged/pulled-out pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 5.

No

Go to the next step.

2

INSPECT BCM CONNECTOR

• Disconnect the BCM connector.

• Inspect the BCM connector terminals for 

poor connection (such as damaged/pulled-
out pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 5.

No

Go to the next step.

3

INSPECT PARKING BRAKE SWITCH SIGNAL 
CIRCUIT FOR OPEN CIRCUIT

• Inspect for continuity between BCM terminal 

1C (wiring harness-side) and parking brake 
switch terminal A (wiring harness-side).

• Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness for a possible open 
circuit, then go to Step 5.

4

INSPECT PARKING BRAKE SWITCH

• Inspect the parking brake switch.

 (See 04-12-13 PARKING BRAKE SWITCH 
INSPECTION.)

• Is there any malfunction?

Yes

Replace the parking brake switch, then go to the next step.

No

Go to the next step.

5

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear the DTC from the BCM memory using 

the M-MDS.

• Perform the self-test.

 (See 09-02F-26 BCM SELF-TEST[BCM].)

• Is the same DTC present?

Yes

Replace the BCM.
 (See 09-40-1 BODY CONTROL MODULE (BCM) 
REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

A

PARKING BRAKE SWITCH

BCM

1C

A

PARKING BRAKE SWITCH WIRING 

HARNESS-SIDE CONNECTOR

BCM WIRING HARNESS-SIDE  

CONNECTOR

5Q

5K

5B

5E

5H

5AC

5N

5Z

5T

5W

5G

5D

5A

5O

5AA

5U

5X

5Y

5V

5S

5P

5M

5AD

5AB

5I

5F

5J

5C

5L

5R

1871-1U-06B(09-02F).fm  21 ページ  ２００６年３月１５日　水曜日　午前１１時４１分

ON-BOARD DIAGNOSTIC [BCM]

09-02F–22

End Of Sie

DTC C1189[BCM]

id0902f5836600

Diagnostic procedure

End Of Sie

DTC C1189

Brake fluid level sensor input short to ground

DETECTION 
CONDITION

Short to GND in wiring harness between BCM and brake fluid level sensor

POSSIBLE 
CAUSE

• Short to GND in wiring harness between BCM terminal 1E and brake fluid level sensor terminal A

• Brake fluid level sensor input malfunction

• BCM malfunction

STEP

INSPECTION

ACTION

1

INSPECT BRAKE FLUID LEVEL SENSOR 
CONNECTOR

• Disconnect the brake fluid level sensor 

connector.

• Inspect the brake fluid level sensor  

connector terminals for poor connection 
(such as damaged/pulled-out pins, and 
corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 5.

No

Go to the next step.

2

INSPECT BCM CONNECTOR

• Disconnect the BCM connector.

• Inspect the BCM connector terminals for 

poor connection (such as damaged/pulled-
out pins, and corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 5.

No

Go to the next step.

3

INSPECT BRAKE FLUID LEVEL SENSOR 
SIGNAL CIRCUIT FOR SHORT TO GND

• Inspect for continuity between BCM terminal 

1E (wiring harness-side) and body GND.

• Is there continuity?

Yes

Repair or replace the wiring harness for a possible short to 
GND, then go to Step 5.

No

Go to the next step.

4

INSPECT BRAKE FLUID LEVEL SENSOR

• Inspect the brake fluid level sensor.

 (See 04-11-11 BRAKE FLUID LEVEL 
SENSOR INSPECTION.)

• Is there any malfunction?

Yes

Replace the brake fluid level sensor, then go to the next 
step.

No

Go to the next step.

5

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear the DTC from the BCM memory using 

the M-MDS.

• Perform the self-test.

 (See 09-02F-26 BCM SELF-TEST[BCM].)

• Is the same DTC present?

Yes

Replace the BCM.
 (See 09-40-1 BODY CONTROL MODULE (BCM) 
REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

BCM

BRAKE FLUID 

LEVEL SENSOR

A

1E

B

B

A

1E

1G

1I

1K

1M

1O

1A

1C

1N

1L

1P

1H

1D

1B

1F

1J

BRAKE FLUID LEVEL SENSOR WIRING 

HARNESS-SIDE CONNECTOR

BCM WIRING HARNESS-SIDE 

CONNECTOR

1871-1U-06B(09-02F).fm  22 ページ  ２００６年３月１５日　水曜日　午前１１時４１分