Nissan GT-R (R35) · Service Manual RESTRAINTS

B1017, B1020, B1021 OCCUPANT SENS C/U

B1017 B1020 B1021

Description


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 lamp when the condition of passenger seat is child-seat and child. In case of malfunction the blinking of the air bag warning lamp report 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 malfunctions in Occupant Classification System and transmits malfunction information to air bag control unit.
 
 STRUCTURE

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

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

DTC Logic

 
 DTC DETECTION LOGIC

DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
B1017
B1020
B1021
 		OCCUPANT SENS C/U
[UNIT FAIL]
 		Trouble occurs in Occupant Classification System control unit
  • Disconnection of wiring harness
  • Malfunction in Occupant Classification System control unit
  • Replace air bag diagnosis sensor unit

 
 DTC CONFIRMATION PROCEDURE

 
 1.CHECK SELF-DIAG RESULT

Diagnosis Procedure


■ 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 HARNESS CONNECTOR
 
 2.CHECK WIRING HARNESS
 
 3.REPLACE OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT
 
 4.REPLACE AIR BAG DIAGNOSIS SENSOR UNIT