Mazda CX 7. Manual — part 312

ON-BOARD DIAGNOSTIC

08-02–43

08-02

DTC B2445, U2018

id080200802800

Diagnostic procedure

DTC

B2445

Passenger-side side air bag sensor No.1 (internal circuit abnormal)

U2018

Passenger-side side air bag sensor No.1 (communication error)

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 the wiring harness between the passenger-side side air bag sensor and SAS control

module

• Malfunction in the passenger-side side air bag sensor circuit

POSSIBLE

CAUSE

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

control module

• Passenger-side side air bag sensor malfunction

• SAS control module malfunction

STEP

INSPECTION

ACTION

1

INSPECT PASSENGER-SIDE SIDE AIR BAG
SENSOR NO. 1 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 B-pillar lower trim (passenger-

side).
(See 09-17-16 B-PILLAR LOWER TRIM
REMOVAL/INSTALLATION.)

• Disconnect the passenger-side side air bag

sensor No. 1 connector.

• Is there any malfunction of the passenger-

side side air bag sensor No. 1 connector?

Yes

Replace the air bag wiring harness.

No

Go to the next step.

A

B

SAS CONTROL MODULE WIRING

HARNESS-SIDE CONNECTOR

PASSENGER-SIDE SIDE AIR BAG SENSOR NO.1

WIRING HARNESS-SIDE CONNECTOR

2A

2B

2C

2D

2E

2F

2G

2H

2I

2J

2L

2M

2O

2P

2R

2S

2T

2U

2V

2W

2Y

2X

2Z

2AA

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ON-BOARD DIAGNOSTIC

08-02–44

End Of Sie

2

INSPECT WIRING HARNESS BETWEEN
PASSENGER-SIDE SIDE AIR BAG SENSOR
NO.1 AND SAS CONTROL MODULE

• Turn the ignition switch to the LOCK position.

• Disconnect the negative battery cable and

wait for 1 min or more.

• 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.

• Disconnect the passenger-side side air bag

sensor No.1 connector.

• Remove the console. (See 09-17-13

CONSOLE REMOVAL/INSTALLATION.)

• Disconnect the SAS control module

connector.

• Connect the negative battery cable.

• Inspect the wiring harnesses between SAS

control module connector terminal 2C and
passenger-side side air bag sensor No.1
connector terminal A, SAS control module
connector terminal 2B and passenger-side
side air bag sensor No.1 connector terminal
B for the following:
— Short to ground

— Short to power supply

— Open circuit

• Is the wiring harness normal?

Yes

Go to the next step.

No

Replace the air bag wiring harness.

3

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 SAS control module connector.

• Connect the passenger-side side air bag

sensor No.1 connector.

• Turn the ignition switch to the ON position.

• Are DTCs B2445 and/or U2018 indicated?

Yes

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

No

DTC troubleshooting completed.

STEP

INSPECTION

ACTION

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ON-BOARD DIAGNOSTIC

08-02–45

08-02

DTC B2477

id080200810500

Diagnostic procedure

End Of Sie

DTC B2773, B2774, B2775, B2776

id080200802900

DTC B2477

Configuration error

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.

• SAS control module configuration has not been performed correctly.

POSSIBLE

CAUSE

• SAS control module configuration error

• SAS control module malfunction

STEP

INSPECTION

ACTION

1

INSPECT SAS CONTROL MODULE

• Using the M-MDS, perform SAS control

moduleconfiguration.

• Is DTC B2477 indicated?

Yes

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

No

DTC troubleshooting completed.

DTC

B2773

Driver-side curtain air bag module circuit resistance low

B2774

Driver-side curtain air bag module circuit resistance high

B2775

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

B2776

Driver-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 driver-side curtain air bag module

circuit

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

module

POSSIBLE

CAUSE

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

control module

• Driver-side curtain air bag module malfunction

• SAS control module malfunction

A

B

DRIVER-SIDE CURTAIN AIR BAG MODULE

WIRING

HARNESS-SIDE

CONNECTOR

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ON-BOARD DIAGNOSTIC

08-02–46

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT DRIVER-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_D

• Is the resistance of the driver-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 driver-side curtain air bag

module connector.

• Is there any malfunction of the driver-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 driver-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 B2773, B2774, B2775 and/or

B2776 indicated?

Yes

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

No

Replace the driver-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 driver-side curtain air bag

module connector.

• Turn the ignition switch to the ON position.

• Are DTCs B2773, B2774, B2775 and/or

B2776 indicated?

Yes

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

No

DTC troubleshooting completed.

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