Nissan Sentra B18 (2020-2025) Service Manual: B1019 Occupant Sens

Nissan Sentra B18 (2020-2025) Service Manual / Restraints / Srs Air Bag Control System :: Dtc/circuit Diagnosis / Air Bag (air Bag Diagnosis Sensor Unit) / B1019 Occupant Sens

Dtc Description

DTC Description

DESCRIPTION

B1019 OCCUPANT SENS

The OCS control unit is wired to the air bag diagnosis sensor unit. The air bag diagnosis sensor unit will monitor the OCS for failures and interruptions in communication between the OCS control unit and the air bag diagnosis sensor unit.

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detecting condition
B1019–09	OCCUPANT SENS [SHORT]	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	Occupant classification system sensor signal
		Threshold	Malfunction of occupant classification system sensor
		Diagnosis delay time	—
B1019–11	OCCUPANT SENS [GND-SHORT]	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	Occupant classification system sensor signal
		Threshold	Malfunction of occupant classification system sensor
		Diagnosis delay time	—
B1019–12	OCCUPANT SENS [VB-SHORT]	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	Occupant classification system sensor signal
		Threshold	Malfunction of occupant classification system sensor
		Diagnosis delay time	—
B1019–13	OCCUPANT SENS [OPEN]	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	Occupant classification system sensor signal
		Threshold	Malfunction of occupant classification system sensor
		Diagnosis delay time	—
B1019–1A	OCCUPANT SENS [SHORT]	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	Occupant classification system sensor signal
		Threshold	Malfunction of occupant classification system sensor
		Diagnosis delay time	—
B1019–1B	OCCUPANT SENS [HIGH RESISTANCE]	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	Occupant classification system sensor signal
		Threshold	Malfunction of occupant classification system sensor
		Diagnosis delay time	—
B1019–55	OCCUPANT SENS [NOT CONFIGURED]	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	Occupant classification system sensor signal
		Threshold	When a mismatch is detected between in the configuration data stored in the air bag diagnosis sensor unit and Nissan Sentra vehicle specification
		Diagnosis delay time	—

POSSIBLE CAUSE

[HIGH RESISTANCE]

Connection malfunction or high resistance of circuit of harness and connector
Internal malfunction of occupant classification system control unit
Internal malfunction of air bag diagnosis sensor unit

[NOT CONFIGURED]

Connection malfunction of harness and connector
Mistake of configuration of air bag diagnosis sensor unit
Internal malfunction of air bag diagnosis sensor unit

[VB-SHORT]

Connection malfunction or short circuit to power supply of harness and connector
Internal malfunction of occupant classification system control unit
Internal malfunction of air bag diagnosis sensor unit

[GND-SHORT]

Connection malfunction or short circuit to ground of harness and connector
Internal malfunction of occupant classification system control unit
Internal malfunction of air bag diagnosis sensor unit

[SHORT]

Connection malfunction or short circuit of harness and connector
Internal malfunction of occupant classification system control unit
Internal malfunction of air bag diagnosis sensor unit

[OPEN]

Connection malfunction or open circuit of harness and connector
Internal malfunction of occupant classification system control unit
Internal malfunction of air bag diagnosis sensor unit

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK SELF DIAGNOSTIC RESULT
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “AIR BAG”.
  3. Check for DTC.
Is the DTC detected?
YES>>
(Current DTC) Refer to DTC Diagnosis Procedure.
YES>>
(Past DTC) GO TO 2.
NO>>
Inspection End.
ERASE SELF DIAGNOSTIC RESULT
1. CONSULT
  
  Erase the DTC.
Can the DTC be erased?
YES>>
Inspection End.
NO>>
Refer to DTC Diagnosis Procedure.

DTC CONFIRMATION PROCEDURE

CHECK SELF DIAGNOSTIC RESULT
1. CONSULT
  1. Ignition switch ON.
  2. Check the air bag warning lamp status. Refer to On Board Diagnosis Function.
  Note:
  SRS will not enter diagnosis mode if no malfunction is detected in user mode.
Is the DTC detected?
YES>>
Refer to DTC Diagnosis Procedure.
NO>>
Inspection End.

Diagnosis Procedure

Diagnosis Procedure

Warning:

Before servicing, ignition switch OFF, disconnect battery negative terminal, and wait at least 3 minutes or more (to discharge backup capacitor).

Never use an unspecified tester or other measuring device.

B1019–55

CHECK HARNESS CONNECTOR
1. Check the harness connector.
Is the inspection result normal?
YES>>
GO TO 2.
NO>>
Replace harness connector.
CHECK WIRING HARNESS
1. Check the wiring harness externals.
Is the inspection result normal?
YES>>
GO TO 3.
NO>>
Replace wiring harness.
PERFORM CONFIGURATION
1. 1. Perform configuration for air bag diagnosis sensor unit. Refer to Work Procedure.
  2. Perform DTC confirmation procedure. Refer to DTC Description.
Is DTC detected?
YES>>
GO TO 4.
NO>>
Inspection End.
REPLACE AIR BAG DIAGNOSIS SENSOR UNIT
1. 1. Replace air bag diagnosis sensor unit. Refer to Removal and Installation.
  2. Perform DTC confirmation procedure. Refer to DTC Description.
Is DTC detected?
YES>>
GO TO 1.
NO>>
Inspection End.

EXCEPT B1019–55

HARNESS CONNECTOR
1. Visually inspect all applicable harness connectors for the following:
  - Visible damage to connector or terminal
  - Loose terminal
  - Poor connection
    Note:
    All harness connectors should be inspected from the air bag diagnosis sensor unit to the end component (including any in-line connectors)
Is the inspection result normal?
YES>>
GO TO 3.
NO>>
Perform the following repairs. Then, GO TO 2.
- Visible damage: Replace the harness.
- Loose terminal: Secure the terminal.
- Poor connection: Secure the connection.
CONFIRM DTC
1. CONSULT
  1. Reconnect all harness connectors.
  2. Ignition switch ON.
  3. Select “Self Diagnostic Result” mode of “AIR BAG”.
  4. Check for DTC.
Is DTC still current?
YES>>
GO TO 3.
NO>>
Clear DTC and perform zero point reset. Refer to Description.
REPLACE OCS CONTROL UNIT AND SENSORS
1. CONSULT
  1. Replace the OCS control unit and sensors. Refer to Removal and Installation (OCS control unit) or Removal and Installation (OCS sensor).
  2. Ignition switch ON.
  3. Select “Self Diagnostic Result” mode of “AIR BAG”.
  4. Check for DTC.
Is DTC still current?
YES>>
GO TO 4.
NO>>
Clear DTC and perform zero point reset. Refer to Description.
AIR BAG DIAGNOSIS SENSOR UNIT
1. CONSULT
  1. Replace the air bag diagnosis sensor unit. Refer to Removal and Installation.
  2. Ignition switch ON.
  3. Select “Self Diagnostic Result” mode of “AIR BAG”.
  4. Check for DTC.
Is DTC still current?
YES>>
GO TO 5.
NO>>
Clear DTC and perform zero point reset. Refer to Description.
RELATED HARNESS
1. CONSULT
  1. Replace the related harnesses (OCS sensors to OCS control unit, OCS control unit to seat, seat to main harness, main harness to air bag diagnosis sensor unit).
  2. Ignition switch ON.
  3. Select “Self Diagnostic Result” mode of “AIR BAG”.
  4. Check for DTC.
Is DTC still current?
YES>>
GO TO 6.
NO>>
Clear DTC and perform zero point reset. Refer to Description.
REPLACE PASSENGER SEAT CUSHION FRAME
1. CONSULT
  1. Replace the passenger seat cushion frame. Refer to Disassembly and Assembly.
  2. Clear DTC and perform zero point reset. Refer to Description.
>>
Inspection End.

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