Infiniti EX35. Manual - part 1350

SRC-26

< COMPONENT DIAGNOSIS >

B1018 OCCUPANT SENS

B1018 OCCUPANT SENS

Description

INFOID:0000000003591730

DTC B1018 [UNIT FAIL] OCCUPANT SENS

Suppresses the deployment of front passenger air bag when the condition of passenger seat is empty or child
and child-seat. And turns on front passenger air bag OFF indicator (Cut-off telltale) lamp when the condition of
passenger seat is child-seat and child. In case of malfunction the blinking of the air bag warning lamp reports
the malfunction to driver and by the on board self-diagnosis system or electro-diagnosis tester CONSULT-III
can detect the cause.

OPERATION

The unit classifies occupant in passenger seat and transmits it to Occupant Classification System (OCS) con-
trol unit.

STRUCTURE

Plural sensors are installed in the sensor mat to prevent incorrect sensing induced by the sitting position.

INSTALLATION

Seat sensor mat is installed in the passenger seat cushion.

DTC Logic

INFOID:0000000003591731

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-26, "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:0000000003591732

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. 

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1018

OCCUPANT SENS 
[UNIT FAIL]

Trouble occurs in OCS-SENSOR

• Disconnection of wiring harness
• Internal breakdown in occupant clas-

sification system sensor

B1018 OCCUPANT SENS

SRC-27

< COMPONENT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

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 OCCUPANT CLASSIFICATION SYSTEM SENSOR

1.

Replace occupant classification system sensor. (front passenger side seat cushion assembly.) Refer
to

SE-87, "Exploded View"

.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-26, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 1.

NO

>> INSPECTION END

SRC-28

< COMPONENT DIAGNOSIS >

B1022 OCCUPANT SENS C/U

B1022 OCCUPANT SENS C/U

Description

INFOID:0000000003591734

DTC B1022 [COMM FAIL] OCCUPANT SENS C/U

Suppresses the deployment of front passenger air bag when the condition of passenger seat is empty or child
and child-seat. And turns on front passenger air bag OFF indicator (Cut-off telltale) lamp when the condition of
passenger seat is child-seat and child. In case of malfunction the blinking of the air bag warning lamp reports
the malfunction to driver and by the on board self-diagnosis system or electro-diagnosis tester CONSULT-III
can detect the cause.

OPERATION

This unit classifies occupant in passenger seat and detects electrical malfunction in Occupant Classification
System (OCS) and transmits malfunction information to air bag control unit.

STRUCTURE

It is integrated into the seat sensor mat and detects the occupants and Occupant Classification System (OCS)
control unit that classifies the occupants.

INSTALLATION

 Occupant Classification System (OCS) control unit is installed in the passenger seat cushion.

DTC Logic

INFOID:0000000003591735

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-28, "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:0000000003591736

WITH CONSULT-III

WARNING:

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1022

OCCUPANT SENS C/U 
[COMM FAIL]

Trouble occurs in OCS-control unit, cir-
cuit of OCS-control unit-Air bag diagno-
sis sensor unit or Air bag diagnosis 
sensor unit

• Disconnection of wiring harness
• Internal breakdown in occupant clas-

sification system control unit

• Internal breakdown in air bag diag-

nosis sensor unit

B1022 OCCUPANT SENS C/U

SRC-29

< COMPONENT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

• 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 OCCUPANT CLASSIFICATION SYSTEM SENSOR

1.

Replace occupant classification system sensor. (front passenger side seat cushion assembly.) Refer to

SE-87, "Exploded View"

.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-28, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 4.

NO

>> INSPECTION END

4.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT

1.

Replace air bag diagnosis sensor unit. Refer to 

SR-16, "Exploded View"

.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Perform DTC confirmation procedure. Refer to 

SRC-28, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 1.

NO

>> INSPECTION END