Mazda CX 7. Manual - part 344

ON-BOARD DIAGNOSTIC [BCM]

09-02F–11

09-02F

DTC B1614[BCM]

id0902f5831900

Diagnostic procedure

DTC B1614

Rear wiper interval switch input circuit short to ground

DETECTION 
CONDITION

Short to GND in wiring harness between BCM and rear wiper and washer switch (INT)

POSSIBLE 
CAUSE

• Short to GND in wiring harness between BCM terminal 3R and windshield wiper and washer switch 

terminal L

• Windshield wiper and washer switch malfunction

• BCM malfunction

STEP

INSPECTION

ACTION

1

INSPECT WINDSHIELD WIPER AND 
WASHER SWITCH CONNECTOR

• Disconnect the windshield wiper and washer 

switch connector.

• Inspect the windshield wiper and washer 

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 WINDSHIELD WIPER AND 
WASHER SWITCH SIGNAL CIRCUIT FOR 
SHORT TO GND

• Inspect for continuity between BCM terminal 

3R (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 WINDSHIELD WIPER AND 
WASHER SWITCH

• Inspect the windshield wiper and washer 

switch.
 (See 09-19-8 WINDSHIELD WIPER AND 
WASHER SWITCH INSPECTION.)

• Is there any malfunction?

Yes

Replace the windshield wiper and washer switch, then go to 
the next step.
 (See 09-19-8 WIPER AND WASHER SWITCH 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.

3R

L

WINDSHIELD WIPER AND 

WASHER SWITCH

BCM

F

WINDSHIELD WIPER AND WASHER 

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

F

M

N

O

P

A

B

C

D

E

H

K

J

L

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ON-BOARD DIAGNOSTIC [BCM]

09-02F–12

End Of Sie

DTC B1520[BCM]

id0902f5834300

DTC B1520

Hood switch ajar circuit open

DETECTION 
CONDITION

Open circuit in wiring harness between BCM and hood latch switch

POSSIBLE 
CAUSE

• Open circuit in wiring harness between BCM terminal 1A and hood latch switch terminal A

• Open circuit in wiring harness between hood latch switch terminal B and body GND

• Hood latch switch malfunction

• BCM malfunction

A

HOOD LATCH SWITCH

BCM

B

1A

HOOD LATCH SWITCH WIRING 

HARNESS-SIDE CONNECTOR

BCM WIRING HARNESS-SIDE 

CONNECTOR

B

A

1E

1G

1I

1K

1M

1O

1A

1C

1N

1L

1P

1H

1D

1B

1F

1J

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ON-BOARD DIAGNOSTIC [BCM]

09-02F–13

09-02F

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT HOOD LATCH SWITCH 
CONNECTOR

• Turn the ignition switch off.

• Disconnect the hood latch switch connector.

• Inspect the hood 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 6.

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 6.

No

Go to the next step.

3

INSPECT HOOD LATCH SWITCH SIGNAL 
CIRCUIT FOR OPEN CIRCUIT

• Inspect for continuity between BCM terminal 

1A (wiring harness-side) and hood latch 
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 6.

4

INSPECT HOOD LATCH SWITCH GND 
CIRCUIT FOR OPEN CIRCUIT

• Inspect for continuity between hood latch 

switch terminal B (wiring harness-side) and 
body GND.

• 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 6.

5

INSPECT HOOD LATCH SWITCH

• Inspect the hood latch switch.

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

• Is there any malfunction?

Yes

Replace the hood latch switch, then go to the next step.
 (See 09-14-5 FRONT DOOR LATCH AND LOCK 
ACTUATOR REMOVAL/INSTALLATION.)

No

Go to the next step.

6

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.

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ON-BOARD DIAGNOSTIC [BCM]

09-02F–14

DTC B1566[BCM]

id0902f5838200

Diagnostic procedure

DTC B1566

Door ajar circuit short to ground

DETECTION 
CONDITION

Short to GND in wiring harness between BCM and door switches

POSSIBLE 
CAUSE

• Short to GND in wiring harness between BCM terminal 5S and rear door switch (LH) terminal A

• Short to GND in wiring harness between BCM terminal 5T and rear door switch (RH) terminal A

• Rear door switch malfunction

• BCM malfunction

STEP

INSPECTION

ACTION

1

INSPECT REAR DOOR SWITCH 
CONNECTOR

• Turn the ignition switch off.

• Disconnect the rear door switch connector.

• Inspect the rear door 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 SLIDING DOOR SWITCH SIGNAL 
CIRCUIT FOR SHORT TO GND

• Inspect for continuity between BCM terminal 

5S, 5T (wiring harness-side) 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 REAR DOOR SWITCH

• Inspect the rear door switch.

 (See 09-18-27 DOOR SWITCH 
INSPECTION.)

• Is there any malfunction?

Yes

Replace the rear door switch, then go to the next step.
 (See 09-18-26 DOOR SWITCH 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.

5S

5T

A

REAR DOOR SWITCH (LH) 

BCM

A

REAR DOOR SWITCH (RH) 

REAR DOOR SWITCH 

HARNESS-SIDE CONNECTOR 

BCM WIRING HARNESS-SIDE  

CONNECTOR

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

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