Nissan Sentra B18 (2020-2025) Service Manual: B00a0-02 Occupant Detection System Control Unit

Dtc Description

DTC Description

DESCRIPTION

DTC B00A0–02 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
B00A0–02	OCCUPANT SENS UNIT [Occupant Classification System (Subfault)]	[UNIT MALFUNC]	Diagnosis condition	When ignition switch is ON.
			Signal terminal	Occupant classification system sensor signal
			Threshold	Malfunction of occupant classification system sensor
			Diagnosis delay time	—

POSSIBLE CAUSE

[UNIT MALFUNC]

• Connection malfunction of harness or connector

• Internal malfunction of occupant classification system sensor

• Internal malfunction of air bag diagnosis sensor unit

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

1. 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.

2. 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

1. 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.

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.