Mazda CX 7. Manual - part 313

ON-BOARD DIAGNOSTIC 

08-02–47

08-02

DTC B2777, B2778, B2779, B2780

id080200803000

DTC

B2777

Passenger-side curtain air bag module circuit resistance low

B2778

Passenger-side curtain air bag module circuit resistance high

B2779

Passenger-side curtain air bag module circuit short to body ground

B2780

Passenger-side curtain air bag module circuit short to power supply

DETECTION 

CONDITION

Warning
• Detection conditions are for understanding the DTC outline before performing an inspection. 

Performing an inspection according to only the detection conditions may cause injury due to 
an operating error, or damage the system. When performing an inspection, always follow the 
inspection procedure.

• Abnormal resistance (other than 1.4— 3.9 ohms) detected in the passenger-side curtain air bag 

module circuit

• Malfunction in the wiring harness between the passenger-side curtain air bag module and SAS control 

module

POSSIBLE 

CAUSE

• Open or short circuit in the wiring harness between the passenger-side curtain air bag module and SAS 

control module

• Passenger-side curtain air bag module malfunction

• SAS control module malfunction

A

B

PASSENGER-SIDE CURTAIN AIR BAG MODULE 

WIRING 

HARNESS-SIDE 

CONNECTOR

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ON-BOARD DIAGNOSTIC 

08-02–48

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT PASSENGER-SIDE CURTAIN AIR 
BAG MODULE

• Using the M-MDS, verify the following PID/

DATA monitor.
(See 08-02-8 PID/DATA MONITOR TABLE.)
— RES_CAB_P

• Is the resistance of the passenger-side 

curtain air bag module normal?
— Resistance: 1.4— 3.9 ohms

Yes

Replace the SAS control module.
(See 08-10-10 SAS CONTROL MODULE REMOVAL/
INSTALLATION.)

No

Go to the next step.

2

INSPECT DRIVER-SIDE CURTAIN AIR BAG 
MODULE CONNECTOR

Warning
• Handling the air bag system 

components improperly can 
accidentally deploy the air bag 
modules and pre-tensioner seat belts, 
which may seriously injure you. Read 
the service warnings and cautions 
before handling the air bag system 
components.
(See 08-10-3 AIR BAG SYSTEM 
SERVICE WARNINGS.)
(See 08-10-5 AIR BAG SYSTEM 
SERVICE CAUTIONS.)

• Turn the ignition switch to the LOCK position.

• Disconnect the negative battery cable and 

wait for 1 min or more.

• Remove the C-pillar trim. (See 09-17-17 C-

PILLAR TRIM REMOVAL/INSTALLATION.)

• Remove the D-pillar trim. (See 09-17-18 D-

PILLAR TRIM REMOVAL/INSTALLATION.)

• Disconnect the passenger-side curtain air 

bag module connector.

• Is there any malfunction of the passenger-

side curtain air bag module connector?

Yes

Replace the air bag wiring harness.

No

Go to the next step.

3

VERIFY WHETHER MALFUNCTION IS IN 
DRIVER-SIDE CURTAIN AIR BAG MODULE 
OR RELATED WIRING HARNESS

• Connect the leads of the SST (Fuel and 

thermometer checker) or apply 2-ohm 
resistance to passenger-side curtain air bag 
module connector terminals A and B.

• Set the resistance of the SST (Fuel and 

thermometer checker) to the 2-ohm 
position.

• Connect the negative battery cable.

• Turn the ignition switch to the ON position.

• Are DTCs B2777, B2778, B2779 and/or 

B2780 indicated?

Yes

Replace the air bag wiring harness, then go to the next 
step.

No

Replace the passenger-side curtain air bag module.
(See 08-10-8 CURTAIN AIR BAG MODULE REMOVAL/
INSTALLATION.)

4

INSPECT SAS CONTROL MODULE

• Turn the ignition switch to the LOCK position.

• Disconnect the negative battery cable and 

wait for 1 min or more.

• Connect the passenger-side curtain air bag 

module connector.

• Are DTCs B2777, B2778, B2779 and/or 

B2780 indicated?

Yes

Replace the SAS control module.
(See 08-10-10 SAS CONTROL MODULE REMOVAL/
INSTALLATION.)

No

DTC troubleshooting completed.

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ON-BOARD DIAGNOSTIC 

08-02–49

08-02

DTC B2867

id080200803100

Diagnostic procedure

DTC B2867

Poor connection of any SAS control module connectors

DETECTION 

CONDITION

Warning
• Detection conditions are for understanding the DTC outline before performing an inspection. 

Performing an inspection according to only the detection conditions may cause injury due to 
an operating error, or damage the system. When performing an inspection, always follow the 
inspection procedure.

• There is no continuity between the poor connection detector bar terminals of the SAS control module.

POSSIBLE 

CAUSE

• Poor connection of any SAS control module connectors

• Malfunction of any SAS control module connectors

• SAS control module malfunction

STEP

INSPECTION

ACTION

1

VERIFY THAT ALL SAS CONTROL MODULE 
CONNECTORS ARE CONNECTED WITH SAS 
CONTROL MODULE

Warning
• Handling the air bag system 

components improperly can 
accidentally deploy the air bag 
modules and pre-tensioner seat belts, 
which may seriously injure you. Read 
the service warnings and cautions 
before handling the air bag system 
components.
(See 08-10-3 AIR BAG SYSTEM 
SERVICE WARNINGS.)
(See 08-10-5 AIR BAG SYSTEM 
SERVICE CAUTIONS.)

• Turn the ignition switch to the LOCK position.

• Disconnect the negative battery cable and 

wait for 1 min or more.

• Partially peel back the floor covering.

• Are all SAS control module connectors 

securely connected?

Yes

Go to the next step.

No

Reconnect the connector properly.

2A

2B

2C

2D

2E

2F

2G

2H

2I

2J

2L

2M

2O

2P

2R

2S

2T

2U

2V

2W

2Y

2X

2Z

2AA

1A

1B

1C

1D

1E

1F

1G

1H

1I

1J

1M

1P

1Q

1R

1S

1T

1U

1V

1W

1X

SAS CONTROL MODULE WIRING 

HARNESS-SIDE CONNECTOR

*

*

*

*

*

*

*

*

*

*

*

*

*

3T

3U

*

3W

3X

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ON-BOARD DIAGNOSTIC 

08-02–50

End Of Sie

DTC C1947, C1948, C1981

id080200803200

2

INSPECT ALL SAS CONTROL MODULE 
CONNECTORS

• Remove the column cover. (See 09-17-8 

COLUMN COVER REMOVAL/
INSTALLATION.)

• Disconnect the clock spring connector.

• Remove the glove compartment.(See 09-17-

8 GLOVE COMPARTMENT REMOVAL/
INSTALLATION.)

• Disconnect the passenger-side air bag 

module connector.

• Disconnect the driver and passenger-side 

seat connectors.

• Remove the C-pillar trim. (See 09-17-17 C-

PILLAR TRIM REMOVAL/INSTALLATION.)

• Remove the D-pillar trim. (See 09-17-18 D-

PILLAR TRIM REMOVAL/INSTALLATION.)

• Disconnect the driver and passenger-side 

curtain air bag module connector.

• Remove the B-pillar lower trim. (See 09-17-

16 B-PILLAR LOWER TRIM REMOVAL/
INSTALLATION.)

• Disconnect the driver and passenger-side 

pre-tensioner seat belt connectors.

• Remove the console. (See 09-17-13 

CONSOLE REMOVAL/INSTALLATION.)

• Disconnect the SAS control module 

connector.

• Are the poor connection detector bars of 

SAS control module connectors normal?

Yes

Replace the SAS control module.
(See 08-10-10 SAS CONTROL MODULE REMOVAL/
INSTALLATION.)

No

Replace the air bag wiring harness.

STEP

INSPECTION

ACTION

DTC

C1947

Seat track position sensor circuit short to body ground

C1948

Seat track position sensor circuit resistance not within specification

C1981

Seat track position sensor circuit open or short to power supply

DETECTION 

CONDITION

Warning
• Detection conditions are for understanding the DTC outline before performing an inspection. 

Performing an inspection according to only the detection conditions may cause injury due to 
an operating error, or damage the system. When performing an inspection, always follow the 
inspection procedure.

• Malfunction in seat track position sensor circuit.

POSSIBLE 

CAUSE

• Malfunction of connector between seat track position sensor and SAS control module.

• Open or short circuit in wiring harness between seat track position sensor and SAS control module.

• Seat track position sensor malfunction

• SAS control module malfunction

2A

2B

2C

2D

2E

2F

2G

2H

2I

2J

2L

2M

2O

2P

2R

2S

2T

2U

2V

2W

2Y

2X

2Z

2AA

SAS CONTROL MODULE WIRING 

HARNESS-SIDE CONNECTOR

SEAT TRACK POSITION SENSOR 

WIRING HARNESS-SIDE CONNECTOR

A

*

C

*

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