Mazda CX 7. Manual - part 343

ON-BOARD DIAGNOSTIC [BCM]

09-02F–7

09-02F

End Of Sie

DTC B1330[BCM]

id0902f5838100

4

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

• Inspect the front door switch (driver-side).

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

• Is there any malfunction?

Yes

Replace the front door switch (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.

STEP

INSPECTION

ACTION

DTC B1330

Passenger door ajar circuit short to ground

DETECTION 
CONDITION

Short to GND in wiring harness between BCM and front door switch (passenger-side)

POSSIBLE 
CAUSE

• Short to GND in wiring harness between BCM terminal 5V and front door switch (passenger-side) 

terminal G

• Front door switch malfunction

• BCM malfunction

5V

A

BCM

A

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

FRONT DOOR SWITCH

FRONT DOOR SWITCH WIRING 

HARNESS-SIDE CONNECTOR

BCM WIRING HARNESS-SIDE 

CONNECTOR

1871-1U-06B(09-02F).fm  7 ページ  ２００６年３月１５日　水曜日　午前１１時４１分

ON-BOARD DIAGNOSTIC [BCM]

09-02F–8

Diagnostic procedure

End Of Sie

DTC B1342[BCM]

id0902f5839600

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT FRONT DOOR SWITCH 
(PASSENGER-SIDE) CONNECTOR

• Turn the ignition switch off.

• Disconnect the front door switch (passenger-

side) connector.

• Inspect the front door switch (passenger-

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 SWITCH 
(PASSENGER-SIDE) SIGNAL CIRCUIT FOR 
SHORT TO GND

• Inspect for continuity between BCM terminal 

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

• Is there continuity?

Yes

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

No

Go to the next step.

4

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

• Inspect the front door switch (passenger-

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

• Is there any malfunction?

Yes

Replace the front door switch (passenger-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.

DTC B1342

ECU is faulted

DETECTION 
CONDITION

BCM microcomputer malfunction

POSSIBLE 
CAUSE

• BCM microcomputer malfunction

STEP

INSPECTION

ACTION

1

INSPECT DTC

• Clear the DTC from the BCM memory using 

the M-MDS.

• Start the engine.

• 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  8 ページ  ２００６年３月１５日　水曜日　午前１１時４１分

ON-BOARD DIAGNOSTIC [BCM]

09-02F–9

09-02F

DTC B1502[BCM]

id0902f5834200

Diagnostic procedure

End Of Sie

DTC B1502

Turn signal left circuit short to ground

DETECTION 
CONDITION

Short to GND in wiring harness between BCM and turn switch

POSSIBLE 
CAUSE

• Short to GND in wiring harness between BCM terminal 3L and light switch terminal A

• Light switch malfunction

• BCM malfunction

STEP

INSPECTION

ACTION

1

INSPECT LIGHT SWITCH CONNECTOR

• Disconnect the light switch connector.

• Inspect the light 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 LIGHT SWITCH SIGNAL CIRCUIT 
FOR SHORT TO GND

• Inspect for continuity between following 

terminals: 
—  BCM terminal 3L (wiring harness-side) —  

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 LIGHT SWITCH

• Inspect the light switch.

• Is there any malfunction?

Yes

Replace the light switch, then go to the next step.
 (See 09-18-14 LIGHT SWITCH INSPECTION.)

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.

3L

A

LIGHT SWITCH

BCM

3N

C

E

LIGHT SWITCH WIRING 

HARNESS-SIDE CONNECTOR

BCM WIRING HARNESS-SIDE 

CONNECTOR

3E

3G

3I

3K

3M

3O

3A

3C

3N

3L

3P

3H

3D

3B

3F

3J

3Q

3R

3S

3T

3U

3V

3W

3X

Q

O

L

J

H

D

E

F

I

K

M

N

P

R

A

B

C

1871-1U-06B(09-02F).fm  9 ページ  ２００６年３月１５日　水曜日　午前１１時４１分

ON-BOARD DIAGNOSTIC [BCM]

09-02F–10

DTC B1506[BCM]

id0902f5831600

Diagnostic procedure

End Of Sie

DTC B1506

Turn signal right circuit short to ground

DETECTION 
CONDITION

Short to GND in wiring harness between BCM and turn switch

POSSIBLE 
CAUSE

• Short to GND in wiring harness between BCM terminal 3N and light switch terminal E

• Light switch malfunction

• BCM malfunction

STEP

INSPECTION

ACTION

1

INSPECT LIGHT SWITCH CONNECTOR

• Disconnect the light switch connector.

• Inspect the light 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 LIGHT SWITCH SIGNAL CIRCUIT 
FOR SHORT TO GND

• Inspect for continuity between following 

terminals: 
—  BCM terminal 3N (wiring harness-side) —  

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 LIGHT SWITCH

• Inspect the light switch.

• Is there any malfunction?

Yes

Replace the light switch, then go to the next step.
 (See 09-18-14 LIGHT SWITCH INSPECTION.)

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.

3L

A

LIGHT SWITCH

BCM

3N

C

E

LIGHT SWITCH WIRING 

HARNESS-SIDE CONNECTOR

BCM WIRING HARNESS-SIDE 

CONNECTOR

3E

3G

3I

3K

3M

3O

3A

3C

3N

3L

3P

3H

3D

3B

3F

3J

3Q

3R

3S

3T

3U

3V

3W

3X

Q

O

L

J

H

D

E

F

I

K

M

N

P

R

A

B

C

1871-1U-06B(09-02F).fm  10 ページ  ２００６年３月１５日　水曜日　午前１１時４１分