Mazda 6. Manual - part 364

ON-BOARD DIAGNOSTIC [AIR BAG SYSTEM] 

T–203

T

End Of Sie

DTC B1881, B1882, B1883, B1886

A6E817401046W10

3

VERIFY WHETHER MALFUNCTION IS IN 
DRIVER-SIDE PRE-TENSIONER SEAT BELT 
OR RELATED WIRING HARNESS

• Connect leads of SST (Fuel and 

thermometer checker) or apply 2 ohm 
resistor to driver-side pre-tensioner seat belt 
connector terminal A and B.

• Set resistance of SST (Fuel and 

thermometer checker) to 2 ohm.

• Connect negative battery cable.

• Turn ignition switch to ON position.

• Check following PID/DATA monitor, using 

SST (WDS or equivalent).
(See 

T–195 PID/DATA MONITOR TABLE

)

— DSB_P_ST

• Is related wiring harness normal?

Yes

Replace driver-side pre-tensioner seat belt.
(See 

S–100 FRONT SEAT BELT REMOVAL/

INSTALLATION

)

No

Replace wiring harness, then go to next step.

4

INSPECT SAS UNIT

• Turn ignition switch to LOCK position.

• Disconnect negative battery cable and wait 

for more than 1 minute.

• Connect driver-side pre-tensioner seat belt 

connector.

• Are DTCs B1877, B1878, B1879 and/or 

B1885 indicated?

Yes

Present malfunction diagnosis:

• Replace SAS unit.

(See 

T–124 SAS UNIT REMOVAL/INSTALLATION

)

Past malfunction diagnosis:

• Troubleshooting completed.

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC

B1881

Passenger-side pre-tensioner seat belt system resistance high

B1882

Passenger-side pre-tensioner seat belt system circuit short to power supply

B1883

Passenger-side pre-tensioner seat belt system circuit short to ground

B1886

Passenger-side pre-tensioner seat belt system resistance low

DETECTION 

CONDITION

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

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

• Abnormal resistance (other than 1.5—3.1 ohm) detected in passenger-side pre-tensioner seat belt 

circuit

• Malfunction in wiring harness between passenger-side pre-tensioner seat belt and SAS unit

POSSIBLE 

CAUSE

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

• Passenger-side pre-tensioner seat belt malfunction

• SAS unit malfunction

T–204

ON-BOARD DIAGNOSTIC [AIR BAG SYSTEM] 

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT PASSENGER-SIDE PRE-
TENSIONER SEAT BELT

• Check following PID/DATA monitor, using 

SST (WDS or equivalent).
(See 

T–195 PID/DATA MONITOR TABLE

)

— PS_PTENS

• Is resistant value of passenger-side pre-

tensioner seat belt normal?
— Resistance: 1.5—3.1 ohm

Yes

Present malfunction diagnosis:

• Replace SAS unit.

(See 

T–124 SAS UNIT REMOVAL/INSTALLATION

)

Past malfunction diagnosis:

• Troubleshooting completed.

No

Go to next step.

2

INSPECT PASSENGER-SIDE PRE-
TENSIONER SEAT BELT CONNECTOR

Warning
• Handling air bag system components 

improperly can accidentally deploy air 
bag modules and pre-tensioner seat 
belts, which may seriously injure you. 
Read AIR BAG SYSTEM SERVICE 
WARNINGS before handling air bag 
system components. 
(See 

T–117 SERVICE WARNINGS

)

• Turn ignition switch to LOCK position.

• Disconnect negative battery cable and wait 

for more than 1 minute.

• Remove passenger’s side B-pillar lower trim.

• Disconnect passenger-side pre-tensioner 

seat belt connector.

• Is there cracking or chipping in passenger-

side pre-tensioner seat belt connector?

Yes

Replace wiring harness.

No

Go to next step.

3

VERIFY WHETHER MALFUNCTION IS IN 
PASSENGER-SIDE PRE-TENSIONER SEAT 
BELT OR RELATED WIRING HARNESS

• Connect leads of SST (Fuel and 

thermometer checker) or apply 2 ohm 
resistor to passenger-side pre-tensioner seat 
belt connector terminal A and B.

• Set resistance of SST (Fuel and 

thermometer checker) to 2 ohm.

• Connect negative battery cable.

• Turn ignition switch to ON position.

• Check following PID/DATA monitor, using 

SST (WDS or equivalent).
(See 

T–195 PID/DATA MONITOR TABLE

)

— PSB_P_ST

• Is related wiring harness normal?

Yes

Replace passenger-side pre-tensioner seat belt.
(See 

S–100 FRONT SEAT BELT REMOVAL/

INSTALLATION

)

No

Replace wiring harness, then go to next step.

4

INSPECT SAS UNIT

• Turn ignition switch to LOCK position.

• Disconnect negative battery cable and wait 

for more than 1 minute.

• Connect passenger-side pre-tensioner seat 

belt connector.

• Are DTCs B1881, B1882, B1883 and/or 

B1886 indicated?

Yes

Present malfunction diagnosis:

• Replace SAS unit.

(See 

T–124 SAS UNIT REMOVAL/INSTALLATION

)

Past malfunction diagnosis:

• Troubleshooting completed.

No

Troubleshooting completed.

ON-BOARD DIAGNOSTIC [AIR BAG SYSTEM] 

T–205

T

DTC B1884, B1890

A6E817401046W11

Diagnostic procedure

DTC

B1884

Passenger-side air bag cut-off indicator light system circuit open or short to ground

B1890

Passenger-side air bag cut-off indicator light system circuit short to power supply

DETECTION 

CONDITION

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

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

• Malfunction in passenger-side air bag cut-off indicator light circuit

POSSIBLE 

CAUSE

• Open or short circuit in wiring harness between SAS unit and passenger-side air bag cut-off indicator 

light

• Open circuit in wiring harness between METER IG 15 A fuse and passenger-side air bag cut-off 

indicator light

• Passenger-side air bag cut-off indicator light malfunction

• SAS unit malfunction

STEP

INSPECTION

ACTION

1

• Is vehicle equipped with passenger-side air bag 

cut-off function?

Yes

[Present malfunction diagnosis]
Go to next step.
[Past malfunction diagnosis]
Go to Step 4.

No

[Present malfunction diagnosis]
Replace SAS unit.
(See 

T–124 SAS UNIT REMOVAL/INSTALLATION

)

[Past malfunction diagnosis]
Troubleshooting completed.

2

INSPECT OPERATION OF PASSENGER-SIDE 
AIR BAG CUT-OFF INDICATOR LIGHT

• Turn ignition switch to LOCK position and wait 

for more than 1 minute.

• Turn ignition switch to ON position.

• Does passenger-side air bag cut-off indicator 

light illuminate?

Yes

Go to next step.

No

Go to Step 6.

3

INSPECT OPERATION OF PASSENGER-SIDE 
AIR BAG CUT-OFF INDICATOR LIGHT

• Without child restraint seat on passenger’s seat, 

does passenger-side air bag cut-off indicator 
light go off after approximately 6 seconds?

Yes

Replace SAS unit.
(See 

T–124 SAS UNIT REMOVAL/INSTALLATION

)

No

Go to next step.

T–206

ON-BOARD DIAGNOSTIC [AIR BAG SYSTEM] 

4

INSPECT WIRING HARNESS BETWEEN 
PASSENGER-SIDE AIR BAG CUT-OFF 
INDICATOR LIGHT AND SAS UNIT

Warning
• Handling air bag system components 

improperly can accidentally deploy air bag 
modules, and pre-tensioner seat belts 
which may seriously injure you. Read AIR 
BAG SYSTEM SERVICE WARNINGS 
before handling air bag system 
components.
(See 

T–117 SERVICE WARNINGS

)

• Turn ignition switch to LOCK position.

• Disconnect negative battery cable and wait for 

more than 1 minute.

• Remove column cover.

• Disconnect clock spring connector.

• Remove glove compartment.

• Disconnect passenger-side air bag module

connector.

• Disconnect driver and passenger-side side air 

bag module connectors. (Vehicle with side air 
bag)

• Disconnect driver and passenger-side curtain air 

bag module connectors. (Vehicles with curtain 
air bag)

• Remove B-pillar lower trim. (Vehicle with pre-

tensioner seat belt)

• Disconnect drive- and passenger-side pre-

tensioner seat belt connectors. (Vehicle with pre-
tensioner seat belt)

• Turn up floor covering.

• Disconnect all SAS unit connectors.

• Connect negative battery cable.

• Turn ignition switch to ON position.

• Measure voltage at 1U of SAS unit connector 

terminal.

• Is voltage more than 9V?

Yes

[Present malfunction diagnosis]
Replace SAS unit.
(See 

T–124 SAS UNIT REMOVAL/INSTALLATION

)

[Past malfunction diagnosis]
Go to next step.

No

Go to next step.

5

INSPECT WIRING HARNESS BETWEEN 
PASSENGER-SIDE AIR BAG CUT-OFF 
INDICATOR LIGHT AND SAS UNIT

• Turn ignition switch to LOCK position.

• Disconnect negative battery cable.

• Remove center panel module.

(See 

T–96 CENTER PANEL MODULE 

REMOVAL/INSTALLATION

)

• Inspect following wiring harness between 

passenger-side air bag cut-off indicator light and 
SAS unit terminals for short to ground:
— A—1U

• Is wiring harness okay?

Yes

[Present malfunction diagnosis]
Replace passenger-side air bag cut-off indicator light.
[Past malfunction diagnosis]
Go to next step.

No

Replace wiring harness.

6

INSPECT PASSENGER-SIDE AIR BAG CUT-OFF 
INDICATOR LIGHT BULB

• Turn ignition switch to LOCK position.

• Disconnect negative battery cable and wait for  

more than 1 minutes.

• Remove center panel module.

(See 

T–96 CENTER PANEL MODULE 

REMOVAL/INSTALLATION

)

• Remove passenger-side air bag cut-off indicator 

light bulb.

• Is passenger-side air bag cut-off indicator light 

bulb okay?

Yes

Reinstall passenger-side air bag cut-off indicator light 
bulb, then go to next step.

No

Replace passenger-side air bag cut-off indicator light 
bulb.

STEP

INSPECTION

ACTION