Nissan Cube. Manual - part 879

B1017, B1020, B1021 OCCUPANT SYSTEM CONTROL UNIT

SRC-33

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

NO

>> INSPECTION END

4.

REPLACE OCCUPANT DETECTION SYSTEM SEAT SENSOR

1.

Replace passenger seat cushion frame. Refer to 

SE-12, "Exploded View"

.

2.

Perform DTC confirmation procedure. Refer to 

SRC-32, "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-32, "DTC Logic"

.

Is DTC detected?

YES

>>  GO TO 1.

NO

>> INSPECTION END

SRC-34

< DTC/CIRCUIT DIAGNOSIS >

B1018 OCCUPANT SYSTEM SENSOR

B1018 OCCUPANT SYSTEM SENSOR

Description

INFOID:0000000009946109

Occupant Detection System sensor detects occupant in passenger seat and transmits it to Occupant Detec-
tion System control unit.

DTC Logic

INFOID:0000000009946110

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAG RESULT

 With CONSULT

1.

Turn ignition switch ON.

2.

Perform “AIR BAG” Self Diagnostic Result with CONSULT.

 Without CONSULT

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status. Refer to 

SRC-18, "Diagnosis with Air Bag Warning Lamp"

.

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

Is malfunctioning part detected?

YES

>> Refer to 

SRC-34, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009946111

WARNING:

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

or more. (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.

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-29, "Removal and Installation"

.

2.

Perform DTC confirmation procedure. Refer to 

SRC-34, "DTC Logic"

.

Is DTC detected?

YES

>>  GO TO 4.

DTC

Display contents of 

CONSULT

DTC detecting condition

Possible cause

B1018

OCCUPANT SENS 
[UNIT FAIL]

Occupant Detection System sen-
sor is malfunctioning

• Disconnection of wiring harness
• Malfunction in Occupant Detection System sensor
• Malfunction in Occupant Detection System control unit
• Malfunction in air bag diagnosis sensor unit

B1018 OCCUPANT SYSTEM SENSOR

SRC-35

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

NO

>> INSPECTION END

4.

REPLACE OCCUPANT DETECTION SYSTEM SEAT SENSOR

1.

Replace passenger seat cushion frame. Refer to 

SE-12, "Exploded View"

.

2.

Perform DTC confirmation procedure. Refer to 

SRC-34, "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-34, "DTC Logic"

.

Is DTC detected?

YES

>>  GO TO 1.

NO

>> INSPECTION END

SRC-36

< DTC/CIRCUIT DIAGNOSIS >

B1022 OCCUPANT SYSTEM CONTROL UNIT

B1022 OCCUPANT SYSTEM CONTROL UNIT

Description

INFOID:0000000009946112

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

DTC Logic

INFOID:0000000009946113

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAG RESULT

 With CONSULT

1.

Turn ignition switch ON.

2.

Perform “AIR BAG” Self Diagnostic Result with CONSULT.

 Without CONSULT

1.

Turn ignition switch ON.

2.

Check the air bag warning lamp status. Refer to 

SRC-18, "Diagnosis with Air Bag Warning Lamp"

.

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

Is malfunctioning part detected?

YES

>> Refer to 

SRC-36, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009946114

WARNING:

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

or more. (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.

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-29, "Removal and Installation"

.

2.

Perform DTC confirmation procedure. Refer to 

SRC-36, "DTC Logic"

.

DTC

Display contents of 

CONSULT

DTC detecting condition

Possible cause

B1022

OCCUPANT SENS C/U 
[COMM FAIL]

• Internal malfunction of Occupant Detec-

tion System control unit

• Malfunction of circuit between Occupant 

Detection System control unit and Air 
bag diagnosis sensor unit

• Malfunction of Air bag diagnosis sensor 

unit

• Disconnection of wiring harness
• Malfunction in Occupant Detection System con-

trol unit

• Malfunction in air bag diagnosis sensor unit