Infiniti QX56 (Z62). Manual - part 1211

SRC-48

< DTC/CIRCUIT DIAGNOSIS >

B1022 OCCUPANT SENS C/U

B1022 OCCUPANT SENS C/U

Description

INFOID:0000000006219975

Suppresses the deployment of front passenger air bag when the condition of passenger seat is empty or occu-
pied with a child and child-seat. Also illuminates front passenger air bag OFF indicator lamp when the condi-
tion of passenger seat is occupied with a 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 CONSULT-III can
detect the cause.

OPERATION

This unit classifies occupant in passenger seat and detects electrical malfunction in Occupant Detection Sys-
tem and transmits malfunction information to air bag control unit.

STRUCTURE

It is integrated into the seat sensor mat and detects the occupants and Occupant Detection System control
unit that classifies the occupants.

INSTALLATION

 Occupant Detection System control unit is installed in the passenger seat cushion.

DTC Logic

INFOID:0000000006219976

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAG RESULT

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Perform “AIR BAG” Self Diagnostic Result CONSULT-III.

 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status. Refer to 

SRC-14, "On Board Diagnosis Function"

.

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

Is malfunctioning part detected?

YES

>> Refer to 

SRC-48, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006219977

WARNING:

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

minutes. (To discharge backup capacitor.)

• Never 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.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1022

OCCUPANT SENS C/U 
[COMM FAIL]

Malfunction occurs in Occupant Detec-
tion System control unit, circuit of Occu-
pant Detection System control unit-Air 
bag diagnosis sensor unit or Air bag di-
agnosis sensor unit

• Disconnection of wiring harness
• Malfunction in Occupant Detection 

System control unit

• Malfunction in air bag diagnosis sen-

sor unit

B1022 OCCUPANT SENS C/U

SRC-49

< DTC/CIRCUIT DIAGNOSIS >

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2.

CHECK WIRING HARNESS

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

YES

>> GO TO 3.

NO

>> Replace wiring harness.

3.

REPLACE OCCUPANT DETECTION SYSTEM CONTROL UNIT

1.

Replace occupant detection system control unit. Refer to 

SR-30, "Removal and Installation"

.

2.

Perform DTC confirmation procedure. Refer to 

SRC-44, "DTC Logic"

.

Is DTC detected?

YES

>>  GO TO 4.

NO

>> INSPECTION END

4.

REPLACE OCCUPANT DETECTION SYSTEM SEAT SENSOR

1.

Replace seat cushion frame. Refer to 

SE-105, "Exploded View"

.

2.

Perform DTC confirmation procedure. Refer to 

SRC-44, "DTC Logic"

.

Is DTC detected?

YES

>>  GO TO 5.

NO

>> INSPECTION END

5.

REPLACE AIR BAG DIAGNOSIS SENSOR UNIT

1.

Replace air bag diagnosis sensor unit. Refer to 

SR-26, "Removal and Installation"

.

2.

Perform DTC confirmation procedure. Refer to 

SRC-48, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 1.

NO

>> INSPECTION END

SRC-50

< DTC/CIRCUIT DIAGNOSIS >

B1023 PASS A/B INDCTR CKT

B1023 PASS A/B INDCTR CKT

Description

INFOID:0000000006219978

Suppresses the deployment of front passenger air bag when the condition of passenger seat is empty or occu-
pied with a child and child-seat. Also illuminates front passenger air bag OFF indicator lamp when the condi-
tion of passenger seat is occupied with a 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 CONSULT-III can
detect the cause.

OPERATION

Illuminates front passenger air bag OFF indicator when the passenger seat is empty or occupied by a child or
a child-seat.

STRUCTURE

Front passenger air bag OFF indicator with LED illumination.

INSTALLATION

Front passenger air bag OFF indicator is installed at the instrument panel center.

DTC Logic

INFOID:0000000006219979

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAG RESULT

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Perform “AIR BAG” Self Diagnostic Result CONSULT-III.

 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status. Refer to 

SRC-14, "On Board Diagnosis Function"

.

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

YES

>> Refer to 

SRC-50, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006219980

WARNING:

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

minutes. (To discharge backup capacitor.)

• Never 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.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1023

PASS A/B INDCTR CKT 
[UNIT FAIL]

Passenger air bag OFF indicator circuit 
is open or shorted to ground or the cir-
cuits are shorted each other

• Disconnection of wiring harness
• Malfunction in front passenger air 

bag OFF indicator

• Malfunction in air bag diagnosis sen-

sor unit

B1023 PASS A/B INDCTR CKT

SRC-51

< DTC/CIRCUIT DIAGNOSIS >

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2.

CHECK WIRING HARNESS

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

YES

>> GO TO 3.

NO

>> Replace wiring harness.

3.

CHECK PASSENGER AIR BAG OFF INDICATOR

1.

Replace front passenger air bag OFF indicator. 

2.

Perform DTC confirmation procedure. Refer to 

SRC-50, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 4.

NO

>> INSPECTION END

4.

REPLACE AIR BAG DIAGNOSIS SENSOR UNIT

1.

Replace air bag diagnosis sensor unit. Refer to 

SR-26, "Removal and Installation"

.

2.

Perform DTC confirmation procedure. Refer to 

SRC-50, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 1.

NO

>> INSPECTION END