Mazda CX 7. Manual - part 305

ON-BOARD DIAGNOSTIC 

08-02–15

08-02

End Of Sie

DTC B1231

id080200801000

Diagnostic procedure

End Of Sie

2

INSPECT WIRING HARNESS BETWEEN 
PASSENGER-SIDE SIDE AIR BAG SENSOR 
NO. 2 AND SAS CONTROL MODULE

• Turn the ignition switch to the LOCK position.

• Disconnect the negative battery cable and 

wait for 1 min or more.

• Disconnect the driver and passenger-side 

front 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 connectors.

• Remove the console.

(See 09-17-13 CONSOLE REMOVAL/
INSTALLATION.)

• Disconnect the SAS control module 

connector.

• Disconnect the passenger-side side air bag 

sensor No. 2 connector.

• Connect the negative battery cable.

• Inspect the wiring harnesses between SAS 

control module terminal 3U and passenger-
side side air bag sensor No. 2 terminal A, 
SAS control module terminal 3T and 
passenger-side side air bag sensor No. 2 
terminal B for the following: 
— Short to ground

— Short to power supply

— Open circuit

• Is the wiring harness normal?

Yes

Replace the passenger-side side air bag sensor No. 2, 
then go to the next step.
 (See 08-10-14 SIDE AIR BAG SENSOR NO. 2 
REMOVAL/INSTALLATION.)

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. 2 connector.

• Are DTCs B1146, B1147 indicated.

Yes

[Present malfunction diagnosis]

• Replace the SAS control module.

(See 08-10-10 SAS CONTROL MODULE REMOVAL/
INSTALLATION.)

[Past malfunction diagnosis]

• DTC troubleshooting completed.

No

DTC troubleshooting completed.

STEP

INSPECTION

ACTION

DTC B1231

SAS control module activation (deployment) control freeze

DETECTION 

CONDITION

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

Performing an inspection with only 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 determined collision

ACTION

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

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ON-BOARD DIAGNOSTIC 

08-02–16

DTC B1317, B1318

id080200811500

Diagnostic procedure

DTC

B1317

SAS control module power supply voltage increases (16.1 V or more)

B1318

SAS control module power supply voltage decreases (less than 8 V)

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.

• When the SAS control module power supply voltage is not within 816 V.

POSSIBLE 

CAUSE

• Open or short circuit in wiring harness between battery and SAS control module

• ARS 7.5 A fuse malfunction

• Battery malfunction

• SAS control module malfunction

STEP

INSPECTION

ACTION

1

INSPECT FUSE

• Remove the ARS 7.5 A fuse.

• Is the fuse normal?

Yes

Install the fuse, then go to the next step.

No

Replace the fuse.

2

INSPECT BATTERY

• Measure the battery positive voltage.

• Is the voltage 8 V16 V?

Yes

Go to the next step.

No

Battery is malfunctioning
Inspect the charge/discharge system.

3

INSPECT WIRING HARNESS BETWEEN 
BATTERY AND FUSE BLOCK

• Turn the ignition switch to the ON position.

• Measure the fuse block terminal Y voltage.

• Is the voltage 8 V16 V?

Yes

Install the fuse, then go to the next step.

No

Repair the wiring harness between the battery and fuse 
block.

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

FUSE BLOCK

AK

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

AA

AB

AC

AD

AE

AF

AG

AH

AI

AJ

AL

AM

AN

AO

AP

AQ

AR

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ON-BOARD DIAGNOSTIC 

08-02–17

08-02

End Of Sie

DTC B1342

id080200801100

Diagnostic procedure

End Of Sie

4

INSPECT WIRING HARNESS BETWEEN FUSE 
BLOCK AND SAS CONTROL MODULE

Warning
• Handling the air bag system components 

improperly can accidentally deploy the air 
bag modules and pre-tensioner front 
buckles, which may seriously injure you. 
Read the service warnings 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 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 lower trim. (See 09-17-17 C-

PILLAR TRIM REMOVAL/INSTALLATION.)

• Remove the D-pillar lower 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.

• Turn the ignition switch to the ON position.

• Is the voltage 8 V16 V?

Yes

[Present malfunction diagnosis]

• Replace the SAS control module.

(See 08-10-10 SAS CONTROL MODULE 
REMOVAL/INSTALLATION.)

[Past malfunction diagnosis]

• DTC troubleshooting completed.

No

Replace the wiring harness between the fuse block and 
SAS control module.

STEP

INSPECTION

ACTION

DTC B1342

SAS control module (internal circuit abnormal)

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 SAS control module internal circuit

POSSIBLE 

CAUSE

SAS control module malfunction

STEP

INSPECTION

ACTION

1

INSPECT SAS CONTROL MODULE

• Using the M-MDS, perform SAS control 

module configuration.

• Is DTC B1342 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 

08-02–18

DTC B1868

id080200815000

Diagnostic procedure

End Of Sie

DTC B1877, B1878, B1879, B1885

id080200801400

Diagnostic procedure

DTC B1868

Air bag warning system light malfunction

DETECTION 

CONDITION

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

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

• Air bag warning system light malfunction.

ACTION

INSPECT INSTRUMENT CLUSTER
Peform the “INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE”. 
(See 09-22-5 INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE.)

DTC

B1877

Driver-side pre-tensioner seat belt circuit resistance high

B1878

Driver-side pre-tensioner seat belt circuit short to power supply

B1879

Driver-side pre-tensioner seat belt circuit short to body ground

B1885

Driver-side pre-tensioner seat belt circuit resistance low

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 1.5— 3.7 ohms) detected in the driver-side pre-tensioner seat belt 

circuit

• Malfunction in the wiring harness between the driver-side pre-tensioner seat belt and SAS control 

module

POSSIBLE 

CAUSE

• Open or short circuit in the wiring harness between the driver-side pre-tensioner seat belt and SAS 

control module

• Driver-side pre-tensioner seat belt malfunction

• SAS control module malfunction

STEP

INSPECTION

ACTION

1

INSPECT DRIVER-SIDE PRE-TENSIONER 
SEAT BELT

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

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

• Is driver-side pre-tensioner seat belt 

resistance normal?
— Resistance: 1.5

3.7 ohms

Yes

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

No

Go to the next step.

A

B

DRIVER-SIDE PRE-TENSIONER SEAT BELT 

WIRING 

HARNESS-SIDE 

CONNECTOR

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