Nissan Sentra B18 (2020-2025) Service Manual / Restraints / Srs Air Bag Control System :: Dtc/circuit Diagnosis / Air Bag (air Bag Diagnosis Sensor Unit) / B00a0-22 Occupant Detection System Control Unit

Nissan Sentra B18 (2020-2025) Service Manual: B00a0-22 Occupant Detection System Control Unit

Dtc Description

DTC Description

DESCRIPTION

DTC B00A0-22 OCCUPANT CLASSIFICATION SYSTEM (OCS)

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 terms (Trouble diagnosis content)		DTC detecting condition
B00A0–22	OCCUPANT SENS UNIT [Occupant Classification System (Subfault)]	[ABNORMAL VOLTAGE]	Diagnosis condition	When ignition switch is ON.
			Signal terminal	Occupant classification system signal
			Threshold	Power supply malfunction (low voltage) of occupant classification system Zero point reset is incomplete Malfunction of input signal from occupant classification system sensor to occupant classification system control unit
			Diagnosis delay time	2 seconds or more.

POSSIBLE CAUSE

[ABNORMAL VOLTAGE]

Connection malfunction or short circuit to power supply of harness or connector
Malfunction of battery voltage (9 V or less)
Incomplete of zero point reset
Internal malfunction of occupant detection system sensor
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.

Dtc Diagnosis Procedure

DTC 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.

CHECK BATTERY VOLTAGE
1. Check battery voltage. Refer to Work Flow.
Is the inspection result normal?
YES >>
GO TO 2.
NO >>
Repair or replace the malfunctioning parts.
PERFORM ZERO POINT RESET
1. 1. Perform zero point reset. Refer to Description.
  2. Perform DTC confirmation procedure. Refer to DTC Description.
Is DTC detected?
YES >>
GO TO 3.
NO >>
Inspection End.
CHECK HARNESS CONNECTOR
1. Check the harness connector.
Is the inspection result normal?
YES >>
GO TO 4.
NO >>
Replace harness connector.
CHECK WIRING HARNESS
1. Check the wiring harness externals.
Is the inspection result normal?
YES >>
GO TO 5.
NO >>
Replace wiring harness.
REPLACE OCS CONTROL UNIT AND SENSORS
1. 1. Replace the OCS control unit and sensors. Refer to Removal and Installation (OCS control unit) or Removal and Installation (OCS sensor).
  2. Perform zero point reset. Refer to Description.
  3. Perform DTC confirmation procedure. Refer to DTC Description.
Is DTC detected?
YES >>
GO TO 6.
NO >>
Inspection End.
REPLACE AIR BAG DIAGNOSIS SENSOR UNIT
1. 1. Replace the 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 7.
NO>>
Inspection End.
REPLACE PASSENGER SEAT CUSHION FRAME
1. 1. Replace the passenger seat cushion frame. Refer to Disassembly and Assembly.
  2. Perform zero point reset. Refer to Description.
  3. Perform DTC confirmation procedure. Refer to DTC Description.
Is DTC detected?
YES >>
GO TO 1.
NO >>
Inspection End.

 B00a0-02 Occupant Detection System Control Unit

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