Mazda 6. Manual - part 80

T–96

AIR BAG SYSTEM 

Operation
Before Activation (Normal Condition)

•

The spool has a pinion on its end, which rotates with the spool when the belt webbing is retracted or withdrawn.

•

There is a ring gear around the pinion. Because the pinion does not engage with the ring gear during normal 
operation, the ring gear does not rotate even when the belt webbing is retracted or withdrawn.

.

During Activation

1. When the pre-tensioner seat belt system receives an operation signal from the SAS control module, gas is 

produced from each generator forcing up the balls in the tube.

2. The balls shift, pushing the ring gear toward the pinion. Due to this, the ring gear and pinion are engaged.
3. The ball shifting makes the ring gear rotate. The pinion, coupled with the rotation of the ring gear, rotates the 

spool in the direction of retraction. Thus the belt webbing is tightened.

.

A6E8130T012

1

Ring gear

2

Pinion

3

Spool

A6E8130T013

1

Gas generator

2

Gas

3

Ball

4

Pinion

5

Ring gear

AIR BAG SYSTEM 

T–97

T

T

After Activation

1. Directly after the activation of the pre-tensioner seat belt system and the application of a load to the seat belt in 

the direction of withdrawal, the ELR lock mechanism operates and the pawl engages the housing gear.

2. When a larger than specified load is applied to the seat belt with the locking base locked by the pawl, the 

torsion bar twists. Thus the spool rotates and the belt webbing is withdrawn.

3. Because the spool rotates in the direction of withdrawal, the ring gear pushes the balls back and the pinion is 

disengaged from the ring gear.

.

End Of Sie

ON-BOARD DIAGNOSTIC FUNCTION

A6E813001046T04

Outline

•

The on-board diagnostic function consists of the following functions: a failure detection function, which detects 
malfunctions in the air bag system-related parts; a memory function, which stores detected DTCs; a self-
malfunction diagnostic function, which indicates system malfunctions using DTCs; a PID/data monitoring 
function, which reads out specific input/output signals; and, an active command mode function, which actively 
controls the operation of output parts.

•

Using an SST (WDS or equivalent), DTCs can be read out and deleted, and the PID/data monitoring function 
and active command mode function can be activated.

•

 A fail-safe function, which prevents the abrupt activation of the air bag module and the pre-tensioned seat belt 
in case of an air bag system malfunction, is included.

•

The failure detection function, memory function, and fail-safe function are the same as that of the 626 (GF) 
model.

A6E8130T014

1

Housing

2

Locking base

3

Pawl

4

Belt

5

Spool

6

Torsion bar

7

Pinion

8

Ring  Gear

9

Ball

T–98

AIR BAG SYSTEM 

Self-Malfunction Diagnostic Function

•

The self-malfunction diagnosis function determines that there is a malfunction, outputs a signal, as a DTC, to 
the DLC-2, and at the same time, flashes the air bag system warning light to advise the driver of a malfunction.

•

The air bag system warning light illuminates or flashes to indicate a single DTC according to the present 
malfunction. (If there is more than one present malfunction, only one DTC will be displayed according to the 
preset priority ranking.)

•

The air bag system warning light will flash the DTC pattern for five cycles, and then will remain illuminated until 
the ignition switch is turned to the LOCK position.

•

If both of the driver-side air bag module connectors are disconnected when SAS unit module configuration is 
performed, the air bag system warning light will flash. Approx. 15 seconds after the connectors are properly 
reconnected, the light will go out.

•

The self-malfunction diagnostic function consists of two function: present malfunction diagnostic and past 
malfunction diagnostic. The function of present malfunction diagnostic and past malfunction diagnostic are the 
same as that of the 626 (GF) model.

DTC table

DTC

Malfunction location

WDS or 

equivalent

Air bag system warning light

Flashing pattern

Priority 

ranking

B1231

13

3

SAS unit activation (deployment) control freeze

B1342

12

2

SAS unit

—

Air bag system warning light is illuminated all 
the time.

1

SAS unit (DTC 12 detection circuit malfunction)

B1869

—

Air bag system warning light is illuminated all 
the time.

1

Air bag system warning light system circuit open

—

Air bag system warning light is illuminated 
does not illuminate.

—

Air bag system warning light system circuit short 
to ground

B1870

—

Air bag system warning light is illuminated all 
the time.

1

Air bag system warning light system circuit short 
to power supply

B1871

47

19

Occupancy sensor system (communication error)

48

20

Occupancy sensor system (sensor internal circuit 
abnormal)

B1877

33

13

Driver-side pre-tensioner seat belt system 
resistance high

B1878

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

B1879

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

B1881

34

12

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 
short to ground

B1884

18

18

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

B1885

33

13

Driver-side pre-tensioner seat belt system 
resistance low

AIR BAG SYSTEM 

T–99

T

T

B1886

34

12

Passenger-side pre-tensioner seat belt system 
resistance low

B1890

18

18

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

B1913

19

11

Driver-side air bag module (inflator No.1) system 
circuit short to ground

21

10

Passenger-side air bag module (inflator No.1) 
system circuit short to ground

B1916

19

11

Driver-side air bag module (inflator No.1) system 
circuit short to power supply

B1921

14

4

Deployment prohibited because configuration is 
not set

B1925

21

10

Passenger-side air bag module (inflator No.1) 
system circuit short to power supply

B1932

19

11

Driver-side air bag module (inflator No.1) system 
resistance high

B1933

21

10

Passenger-side air bag module (inflator No.1) 
system resistance high

B1934

19

11

Driver-side air bag module (inflator No.1) system 
resistance low

B1935

21

10

Passenger-side air bag module (inflator No.1) 
system resistance low

B1992

22

15

Driver-side side air bag module system circuit 
short to power supply

B1993

Driver-side side air bag module system circuit 
short to ground

B1994

Driver-side side air bag module system resistance 
high

B1995

Driver-side side air bag module system resistance 
low

B1996

23

14

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

B1997

Passenger-side side air bag module system 
circuit short to ground

B1998

Passenger-side side air bag module system 
resistance high

B1999

Passenger-side side air bag module system 
resistance low

DTC

Malfunction location

WDS or 

equivalent

Air bag system warning light

Flashing pattern

Priority 

ranking