Occupant Classification System Control Unit

Removal and Installation

Removal and Installation

OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT

Warning:

• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the Ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing serious injury.

• Before servicing the SRS, place the ignition switch in the OFF position, disconnect both battery terminals then wait at least three minutes.

CAUTION:

• When working with the metal seat frame, use caution to avoid injury from sharp edges.

• When removing or installing the seat, use shop cloths to protect components from damage.

• When disconnecting or connecting the harness and harness connectors, handle them carefully to avoid damage.

Removal

Remove the front passenger seat. Refer to Removal and Installation – Seat Assembly.

Remove screws (A) from the occupant classification system control unit (1).

Disconnect the harness connector from the occupant classification system control unit.

Remove occupant classification system control unit.

CAUTION:

• Replace the occupant classification control unit if it has been dropped or sustained an impact.

• Do not strike the occupant classification control unit.

Installation

Installation is in the reverse order of removal.

Warning:

• After installation is complete, perform additional services (Zero point reset) when replacing control unit. Refer to Special Repair Requirement.

• Zero point reset must be performed every time the front passenger seat is removed from the Nissan Sentra vehicle.

• Zero point reset is done after the front passenger seat is installed in vehicle and all nuts and bolts are tightened to specification.

CAUTION:

• After installation is complete, check that no system malfunction is detected causing the air bag warning lamp to illuminate.

• If a malfunction is indicated by the air bag warning lamp after repair or replacement of the malfunctioning parts, perform the SRS final check. Refer to SRS Final Check.

Occupant Classification System Sensor

Removal and Installation

Removal and Installation

OCCUPANT CLASSIFICATION SYSTEM SENSORS

Warning:

• When working near the occupant classification system sensor or other air bag system sensors with the ignition switch ON or engine running, DO NOT use air or electric power tools or strike near the sensors with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing serious injury.

• Before servicing the SRS, place the ignition switch in the OFF position, disconnect both battery terminals then wait at least three minutes.

• Do not use air tools or electric tools for servicing the occupant classification system sensor.

• Do not cause impact to the occupant classification system sensor by dropping, etc. Replace the occupant classification system sensor if it has been dropped or sustained an impact.

• Do not allow oil, grease, detergent, or water to come in contact with the occupant classification system sensor.

CAUTION:

• When working with the metal seat frame, use caution to avoid injury from sharp edges.

• When removing or installing the seat trim, handle it carefully to keep dirt out and to avoid damage.

• When removing or installing the seat, use shop cloths to protect components from damage.

• When disconnecting or connecting the harness and harness connectors, handle them carefully to avoid damage.

REMOVAL

Remove the passenger seat cushion. Refer to Disassembly and assembly .

Disconnect the harness connectors (A) from the occupant classification system sensors.

Install the passenger seat to the Nissan Sentra vehicle and tighten bolts to specification in the order shown:

Passenger seat bolts

: 50 N·m (5.1 kg-m, 37 ft-lb)

Remove the passenger seat frame assembly from the seat track using the following procedure: Release pawl and position aside the seat cushion inner finisher [LH (1)].

	: Pawl
	: Front

Remove nut (A) from the LH (inboard) rear of the seat frame assembly (1).

CAUTION:

Do not reuse nut (A).

Remove nut (A) from the RH (outboard) rear of the seat frame assembly (1).

: Front

CAUTION:

Do not reuse nut (A).

Remove nut (A) from the RH (outboard) front of the seat frame assembly (1).

: Front

CAUTION:

Do not reuse nut (A).

Remove nut (A) from the LH (inboard) front of the seat frame assembly (1).

: Front

CAUTION:

Do not reuse nut (A).

Separate the seat frame assembly from the seat track and remove the seat frame assembly from Nissan Sentra vehicle.

Remove nuts (A) and remove the front occupant classification system sensor (1) from the seat track.

: Front

CAUTION:

• Make sure spacer plates under the occupant classification system sensors remain on the seat track.

• Do not reuse nut (A).

Remove nuts (A) and remove the rear occupant classification system sensor (1) from the seat track.

: Front

CAUTION:

Do not reuse nut (A).

INSTALLATION

CAUTION:

• Do not damage the occupant classification system sensor during installation.

• Do not damage occupant classification system sensor harness during installation.

• After installation is complete, check that no system malfunction is detected causing the air bag warning lamp to illuminate.

• If a malfunction is indicated by the air bag warning lamp after repair or replacement of the malfunctioning parts, perform the SRS final check. Refer to SRS Final Check.

• Perform zero point reset function after the front passenger seat is installed in the Nissan Sentra vehicle and all bolts are tightened to specification. Refer to Special Repair Requirement.

Install the rear occupant classification system sensor (1) to the seat track and tighten nuts (A) to specification.

Occupant classification system sensor nut

: 24 N·m (2.4 kg-m, 18 ft-lb)

: Front

Install front classification system sensor (1) to the seat track and tighten nuts to specification.

Occupant classification system sensor nut

: 24 N·m (2.4 kg-m, 18 ft-lb)

: Front

Install the passenger seat frame assembly to the seat track using the following procedure: Gently place the passenger seat frame assembly on the seat track.

CAUTION:

• Do not cause impact to the occupant classification sensors when placing the seat frame assembly on the seat track.

• Do not damage the occupant classification system sensor harness connectors.

Install nut (A) to the LH (inboard) front of the seat frame assembly (1) and tighten to specification.

Seat frame assembly nut

: 45 N·m (4.6 kg-m, 33 ft-lb)

: Front

Install nut (A) to the RH (outboard) front of the seat frame assembly (1) and tighten to specification.

Seat frame assembly nut

: 45 N·m (4.6 kg-m, 33 ft-lb)

: Front

Install nut (A) to the RH (outboard) rear of the seat frame assembly (1) and tighten to specification.

Seat frame assembly nut

: 45 N·m (4.6 kg-m, 33 ft-lb)

: Front

Install nut (A) to the LH (inboard) rear of the seat frame assembly (1) and tighten to specification.

Seat frame assembly nut

: 45 N·m (4.6 kg-m, 33 ft-lb)

: Front

Install the seat cushion inner finisher [LH (1)] to the seat frame assembly.

: Front

Installation of the remaining components is in the reverse order of removal.