Infiniti FX35, FX50 (S51). Manual - part 1745

B1209 FRONTAL COLLISION DETECTION

SRC-145

< DTC/CIRCUIT DIAGNOSIS >

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B1209 FRONTAL COLLISION DETECTION

Description

INFOID:0000000005241244

DTC B1209 FRONTAL COLLISION DETECTION

When crash zone sensor detects component damage resulting from a front collision, the system blinks or illu-
minates the air bag warning lamp to inform the driver. Malfunctioning can be detected by CONSULT-III.

OPERATION

The air bags and seat belt pre-tensioners for driver and front passenger are activated by the air bag diagnosis
sensor unit signal transmitted at the time of the frontal collision.

STRUCTURE

It consists of crash zone sensor, air bag diagnosis sensor unit, air bags and seat belt pre-tensioners for driver
and front passenger.

INSTALLATION

Refer to 

SR-11, "Exploded View"

 (Driver air bag module), 

SR-17, "Exploded View"

 (Front passenger air bag

module), 

SR-21, "Exploded View"

(Crash zone sensor), 

SR-25, "Exploded View"

 (Air bag diagnosis sensor

unit), 

SB-6, "SEAT BELT RETRACTOR : Exploded View"

 (Front LH/RH seat belt pre-tensioner).

DTC Logic

INFOID:0000000005241245

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAG RESULT

With CONSULT-III

1.

Turn ignition switch ON.

2.

Perform “AIR BAG” Self Diagnostic Result.

Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status. Refer to 

SRC-16, "Air Bag Warning Lamp Diagnosis"

.

NOTE:
SRS does not enter diagnosis mode if no malfunction is detected in user mode.
Is malfunctioning part detected?

YES

>> Refer to 

SRC-145, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005510865

WARNING:

• Before servicing, turn ignition switch OFF, disconnect battery negative terminal, and wait at least 3

minutes or more. (To discharge backup capacitor.)

• Never use unspecified tester or other measuring device. 

1.

PERFORM COLLISION DIAGNOSIS

Perform collision diagnosis.Refer to 

SR-5, "FOR FRONTAL COLLISION : When SRS is activated in a colli-

sion"

 or 

SR-6, "FOR FRONTAL COLLISION : When SRS is not activated in a collision"

.

Iscollision diagnosis complete?

YES

>> GO TO 2.

NO

>> INSPECTION END

2.

FINAL INSPECTION

Perform “AIR BAG” Self Diagnostic Result.

Is the inspection result normal?

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1209

FRONTAL COLLISION 
DETECTION

Front seat belt pre-tensioner, front air 
bag is deployed

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SRC-146

< DTC/CIRCUIT DIAGNOSIS >

B1209 FRONTAL COLLISION DETECTION

YES

>> INSPECTION END

NO

>> Peform diagnosis of applicable DTC.Refer to 

SRC-156, "DTC Index"

.

B1210 SIDE COLLISION DETECTION

SRC-147

< DTC/CIRCUIT DIAGNOSIS >

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B1210 SIDE COLLISION DETECTION

Description

INFOID:0000000005241247

DTC B1210 SIDE COLLISION DETECTION

When satellite sensor detects component damage resulting from a side collision, blinks or illuminates the air
bag warning lamp to inform the driver. Malfunctioning can be detected by CONSULT-III.

OPERATION

The front side air bag and side curtain air bag are activated by the air bag diagnosis sensor unit signal trans-
mitted at the time of the side collision.

STRUCTURE

It consists of satellite sensor, air bag diagnosis sensor unit, front side air bag and side curtain air bag. 

INSTALLATION

Refer to 

SE-81, "Exploded View"

 (Front LH/RH side air bag module), 

SR-19, "Exploded View"

 (Side curtain air

bag module), 

SR-23, "Exploded View"

 (LH/RH satellite sensor).

DTC Logic

INFOID:0000000005241248

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAG RESULT

With CONSULT-III

1.

Turn ignition switch ON.

2.

Perform “AIR BAG” Self Diagnostic Result.

Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status. Refer to 

SRC-16, "Air Bag Warning Lamp Diagnosis"

.

NOTE:
SRS does not enter diagnosis mode if no malfunction is detected in user mode.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-147, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005510866

WARNING:

• Before servicing, turn ignition switch OFF, disconnect battery negative terminal, and wait at least 3

minutes or more. (To discharge backup capacitor.)

• Never use unspecified tester or other measuring device. 

1.

PERFORM COLLISION DIAGNOSIS

Perform collision diagnosis.Refer to 

SR-7, "FOR SIDE AND ROLLOVER COLLISION : When SRS is activated

in a collision"

 or 

SR-8, "FOR SIDE AND ROLLOVER COLLISION : When SRS is not activated in a collision"

.

Iscollision diagnosis complete?

YES

>> GO TO 2.

NO

>> INSPECTION END

2.

FINAL INSPECTION

Perform “AIR BAG” Self Diagnostic Result.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Peform diagnosis of applicable DTC.Refer to 

SRC-156, "DTC Index"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1210

SIDE COLLISION DE-
TECTION

Front side air bag, side curtain air bag is 
deployed

—

SRC-148

< DTC/CIRCUIT DIAGNOSIS >

B1211 ROLLOVER DETECTION

B1211 ROLLOVER DETECTION

Description

INFOID:0000000005241250

DTC B1211 ROLLOVER DETECTION

When detect component damage resulting from a rollover, brinks or illuminates the air bag warning lamp to
inform the driver. Malfunctioning can be detected by CONSULT-III.

OPERATION

The front seat belt pre-tensioner and side curtain air bag are operated by the decision of the air bag diagnosis
sensor unit signal of the rollover.

STRUCTURE

It consists of front seat belt pre-tensioner, side curtain air bag and air bag diagnosis sensor unit.

INSTALLATION

Refer to 

SB-6, "SEAT BELT RETRACTOR : Exploded View"

 (Seat belt pre-tensioner), 

SR-19, "Exploded

View"

 (Side curtain air bag) and 

SR-25, "Exploded View"

 (Air bag diagnosis sensor unit).

DTC Logic

INFOID:0000000005241251

DTC DETECTION LOGIC

With CONSULT-III

DTC No. Index (“SELF-DIAG [CURRENT]”), (“SELF-DIAG [PAST]” or “TROUBLE DIAG RECORD”)

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAG RESULT

With CONSULT-III

1.

Turn ignition switch ON.

2.

Perform “AIR BAG” Self Diagnostic Result.

Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status. Refer to 

SRC-16, "Air Bag Warning Lamp Diagnosis"

.

NOTE:
SRS does not enter diagnosis mode if no malfunction is detected in user mode.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-148, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005510867

WARNING:

• Before servicing, turn ignition switch OFF, disconnect battery negative terminal, and wait at least 3

minutes or more. (To discharge backup capacitor.)

• Never use unspecified tester or other measuring device. 

1.

PERFORM COLLISION DIAGNOSIS

Perform collision diagnosis.Refer to 

SR-7, "FOR SIDE AND ROLLOVER COLLISION : When SRS is activated

in a collision"

 or 

SR-8, "FOR SIDE AND ROLLOVER COLLISION : When SRS is not activated in a collision"

.

Iscollision diagnosis complete?

YES

>> GO TO 2.

NO

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1211

ROLLOVER DETEC-
TION

Front seat belt pre-tensioner. side cur-
tain air bag module are deployed be-
cause of rollover detection

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