Infiniti G37 Coupe. Manual - part 1194

SRC-26

< COMPONENT DIAGNOSIS >

B1017, B1020, B1021 OCCUPANT SENS C/U

>> GO TO 2.

2.

CHECK AIR BAG WARNING LAMP

Check the warning lamp status.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-133, "DTC Index"

.

NO

>> INSPECTION END.

Diagnosis Procedure (Component diagnosis)

INFOID:0000000001694496

With CONSULTlll

WARNING:

• Before servicing, turn ignition switch OFF, disconnect both battery terminals and wait at least 3 min-

utes. (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

>> Repair or replace harness connectors.

2.

CHECK WIRING HARNESS

Check the wiring harness externals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace wiring harness.

3.

CHECK OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT

1.

Replace OCS CONTROL UNIT. (passenger side seat cushion assembly.)

2.

Check the screen of CONSULT-lll.

is the inspection result normal?

YES

>> INSPECTION END.

NO

>> Check the intermittent incident. Refer to 

GI-38, "Intermittent Incident"

.

B1018 OCCUPANT SENS

SRC-27

< COMPONENT DIAGNOSIS >

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B1018 OCCUPANT SENS

Description

INFOID:0000000001694497

DTC B1018 [UNIT FAIL] OCCUPANT SENS

Suppresses the deployment of passenger air bag when the condition of passenger seat is empty or child and
child-seat. And turns on cut-off telltale lamp when the condition of passenger seat is child-seat and child. In
case of malfunction the blinking of the SRS air bag warning lamp reports the malfunction to driver and by the
on board self-diagnosis system or electro-diagnosis tester CONSULT-lll 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:0000000001694498

DTC DETECTION LOGIC

With CONSULT-lll

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

DTC CONFIRMATION PROCEDURE (With CONSULT-lll)

1.

INSPECTION START

Turn ignition switch ON.

>> GO TO 2.

2.

CHECK SELF-DIAG RESULT

Check the screen of CONSULT-III.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-28, "Diagnosis Procedure (Component diagnosis)"

.

NO

>> INSPECTION END.

DTC CONFIRMATION PROCEDURE (Without CONSULT-lll)

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

1.

INSPECTION START

Turn ignition switch ON.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1018

OCCUPANT SENS 
[UNIT FAIL]

Trouble occurs in OCS-SENS.

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

sification system sensor.

• Internal breakdown in diagnosis sen-

sor unit (ACU).

SRC-28

< COMPONENT DIAGNOSIS >

B1018 OCCUPANT SENS

>> GO TO 2.

2.

CHECK AIR BAG WARNING LAMP

Check the warning lamp status.

Is malfunctioning part detected?

YES

>> Refer to 

SRC-133, "DTC Index"

.

NO

>> INSPECTION END.

Diagnosis Procedure (Component diagnosis)

INFOID:0000000001694499

With CONSULT-lll

WARNING:

• Before servicing, turn ignition switch OFF, disconnect both battery terminals and wait at least 3 min-

utes. (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

>> Repair or replace harness connectors.

2.

CHECK WIRING HARNESS

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

YES

>> GO TO 3.

NO

>> Repair or replace wiring harness.

3.

CHECK OCCUPANT CLASSIFICATION SYSTEM SENSOR

1.

Replace OCS SENSOR. (passenger side seat cushion assembly.)

2.

Check the screen of CONSULT-lll.

Is the inspection result normal?

YES

>> INSPECTION END.

NO

>> Check the intermittent incident. Refer to 

GI-38, "Intermittent Incident"

.

B1022 OCCUPANT SENS C/U

SRC-29

< COMPONENT DIAGNOSIS >

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B1022 OCCUPANT SENS C/U

Description

INFOID:0000000001694500

DTC B1022 [COMM FAIL] OCCUPANT SENS C/U

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

OPERATION

This unit classfies 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:0000000001694501

DTC DETECTION LOGIC

With CONSULT-lll

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

DTC CONFIRMATION PROCEDURE (With CONSULT-lll)

1.

INSPECTION START

Turn ignition switch ON.

>> GO TO 2.

2.

CHECK SELF-DIAG RESULT

Check the screen of CONSULT-lll.
Is malfunctioning part detected?

YES

>> Refer to 

SRC-30, "Diagnosis Procedure (Component diagnosis)"

.

NO

>> INSPECTION END.

DTC CONFIRMATION PROCEDURE (Without CONSULT-lll)

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

1.

INSPECTION START

Turn ignition switch ON.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B1022

OCCUPANT SENS C/U 
[COMM FAIL]

Trouble occurs in OCS-C/U, circuit of 
OCS-C/U-ACU or ACU.

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

sification system control unit.

• Internal breakdown in diagnosis sen-

sor unit (ACU).