Infiniti EX35. Manual - part 1374

SRC-122

< COMPONENT DIAGNOSIS >

B1202, B1203, B1204, B1205, B1206, B1207 DIAGNOSIS SENSOR UNIT

B1202, B1203, B1204, B1205, B1206, B1207 DIAGNOSIS SENSOR UNIT

Description

INFOID:0000000003591916

DTC B1202, B1203, B1204, B1205, B1206, B1207 DIAGNOSIS SENSOR UNIT

Detects the whole SRS electrical system and displays the malfunction either by illuminating or blinking the air
bag warning lamp in the combination meter. Malfunctioning part can be detected by on board self-diagnosis
system and electro-diagnosis tester CONSULT-III.

OPERATION

It detects a shock that exceeds specified level and monitors such systems as the driver and passenger air
bag, side air bag, curtain air bag, pre-tensioner seat belts and Occupant Classification System (OCS) operate
properly. 

STRUCTURE

It contains the “G” sensors for both frontal and side collisions and spare battery function in case of main bat-
tery damage in collision.

INSTALLATION

Air bag diagnosis sensor unit is installed under the center console with fixed bolts.

DTC Logic

INFOID:0000000003591917

DTC DETECTION LOGIC

With CONSULT-III

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

DTC CONFIRMATION PROCEDURE (WITH CONSULT-III)

1.

CHECK SELF-DIAG RESULT

1.

Turn ignition switch ON.

2.

Check the screen of CONSULT-III.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-122, "Diagnosis Procedure"

.

NO

>> INSPECTION END

DTC CONFIRMATION PROCEDURE (WITHOUT CONSULT-III)

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

1.

CHECK AIR BAG WARNING LAMP

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status.

Is malfunctioning part detected?

YES

>> Refer to warning lamp flash code chart. Refer to 

SRC-128, "DTC Index"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003591918

WITH CONSULT-III

WARNING:

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1202
B1203
B1204 
B1205
B1206
B1207

CONTROL UNIT 

• Air bag diagnosis sensor unit is out of 

order or mis-match

• Internal breakdown in air bag diag-

nosis sensor unit

• Mis-match between specification on 

vehicle and configuration in air bag 
diagnosis sensor unit

B1202, B1203, B1204, B1205, B1206, B1207 DIAGNOSIS SENSOR UNIT

SRC-123

< COMPONENT DIAGNOSIS >

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

minutes. (To discharge backup capacitor.)

• Do not use unspecified tester or other measuring device. 

DIAGNOSTIC PROCEDURE

1.

CHECK HARNESS CONNECTOR

Check the connection of harness connector.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace harness connectors.

2.

CHECK WIRING HARNESS

Check the wiring harness externals.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace wiring harness.

3.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT

1.

Replace air bag diagnosis sensor unit. Refer to 

SR-4, "Exploded View"

.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-122, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 1. 

NO

>> INSPECTION END

SRC-124

< COMPONENT DIAGNOSIS >

B1209 FRONTAL COLLISION DETECTION

B1209 FRONTAL COLLISION DETECTION

Description

INFOID:0000000003591919

DTC B1209 FRONTAL COLLISION DETECTION

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

OPERATION

The air bags and seat belt pre-tensioners for driver and front passenger are operated by the decision of the air
bag diagnosis sensor unit out signal transmitted because 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-12, "Removal and Installation"

, 

SR-16, "Removal and Installation"

, 

SR-4, "Removal and Installa-

tion"

, 

SR-8, "Removal and Installation"

, 

SR-18, "Removal and Installation"

.

DTC Logic

INFOID:0000000003591920

DTC DETECTION LOGIC

With CONSULT-III

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

DTC CONFIRMATION PROCEDURE (WITH CONSULT-III)

1.

CHECK SELF-DIAG RESULT

1.

Turn ignition switch ON.

2.

Check the screen of CONSULT-III.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-124, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003591921

WITH CONSULT-III

WARNING:

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

minutes. (To discharge backup capacitor.)

• Do not use unspecified tester or other measuring device. 

DIAGNOSTIC PROCEDURE

1.

CHECK FRONT AIR BAG MODULE

Check front air bag modules. (driver air bag module and/or front passenger air bag module.)
Is the front air bag module deployed?

YES

>> Replace front air bag modules. Refer to 

SR-4, "Removal and Installation"

 or 

SR-8, "Removal and

Installation"

.

NO

>> GO TO 2.

2.

CHECK FRONT SEAT BELT PRE-TENSIONER

Check front seat belt pre-tensioner.
Is the front seat belt pre-tensioner activated?

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1209

FRONTAL COLLISION 
DETECTION

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

—

B1209 FRONTAL COLLISION DETECTION

SRC-125

< COMPONENT DIAGNOSIS >

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YES

>> Replace front seat belt pre-tensioner. Refer to 

SR-18, "Removal and Installation"

.

NO

>> GO TO 3.

3.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT

Check air bag diagnosis sensor unit.

Is the front air bag module and/or front seat belt pre-tensioner activated?

YES

>> Replace air bag diagnosis sensor unit. Refer to 

SR-16, "Removal and Installation"

.

NO

>> GO TO 4.

4.

CHECK STEERING WHEEL

Check steering wheel.

Is the steering wheel normal?

YES

>> GO TO 5.

NO

>> Replace steering wheel. Refer to 

ST-16, "Removal and Installation"

.

5.

CHECK SPIRAL CABLE

1.

Check the continuity of spiral cable.Refer to 

SRC-40, "Diagnosis Procedure"

.

2.

Operate the steering wheel to check excessive heavy operation force, abnormal noise or damage.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace spiral cable. Refer to 

SR-6, "Removal and Installation"

.

6.

CHECK WIRING HARNESS/HARNESS CONNECTOR

Check wiring harness/harness connector.
Is the wiring harness/harness connector normal?

YES

>> GO TO 7.

NO

>> Replace wiring harness/harness connector.

7.

FINAL CHECK

Check the screen of CONSULT-III and/or Air bag warning lamp status.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Check the intermittent incident. Refer to 

GI-38, "Intermittent Incident"

.