Nissan Sentra manuals

Nissan Sentra B18 (2020-2025) Service Manual: For Frontal Collision

Nissan Sentra B18 (2020-2025) Service Manual / Restraints / Srs Air Bag :: Basic Inspection / Collision Diagnosis / For Frontal Collision

For Frontal Collision

FOR FRONTAL COLLISION: When SRS is activated in a collision

CAUTION:

Due to varying models and option levels, not all parts listed in the chart below apply to all Nissan Sentra vehicles.

WORK PROCEDURE

  1. Before performing any of the following steps, ensure that all Nissan Sentra vehicle body and structural repairs have been completed.

  2. Replace the air bag diagnosis sensor unit.

  3. Remove the following:

    • Front air bag modules

    • Knee air bag modules

    • Crash zone sensor assembly

    • Crash zone sensor assembly bracket

    • Seat belt pre-tensioner assemblies.

  4. Check the SRS components using the table below:

    Replace any SRS components showing visible signs of damage. (dents, cracks and deformation, etc.)

  5. Install the following:

    • New front air bag modules

    • New knee air bag modules

    • New crash zone sensor assembly

    • New crash zone sensor assembly bracket

    • New seat belt pre-tensioner assemblies.

  6. Perform self-diagnosis using CONSULT or air bag warning lamp. Refer to Trouble Diagnosis with CONSULT for details.

    Ensure entire SRS operates properly.

  7. After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to SRS Final Check.

SRS INSPECTION (FOR FRONTAL COLLISION)

Part

Inspection

Driver air bag module

If the driver air bag has deployed:

REPLACE

Install with new fasteners.

Driver knee air bag module

If the driver knee air bag has deployed:

REPLACE

Install with new fasteners.

Front passenger air bag module

If the front passenger air bag has deployed:

REPLACE

Install with new fasteners.

Front passenger knee air bag module

If the front passenger knee air bag has deployed:

REPLACE

Install with new fasteners.

Crash zone sensor

If any of the front air bags or seat belt pre-tensioners* have been activated:

REPLACE the crash zone sensor and bracket with new fasteners.

*: Confirm seat belt pre-tensioner activation using CONSULT only.

Seat belt pre-tensioner assemblies

(All applicable locations: buckle, retractor, lap outer)

If any of the seat belt pre-tensioners* have been activated:

REPLACE all seat belt pre-tensioner assemblies with new fasteners.

*: Confirm seat belt pre-tensioner activation using CONSULT only.

Diagnosis sensor unit

If any of the SRS components have been activated:

REPLACE the air bag diagnosis sensor unit.

Install with new fasteners.

Steering wheel

  1. Visually check steering wheel for deformities.

  2. Check harness (built into steering wheel) and connectors for damage, and terminals for deformities.

  3. Install driver air bag module into the steering wheel to check fit and alignment with the wheel.

  4. Check steering wheel for excessive free play.

  5. If no damage is found, reinstall.

  6. If damaged — REPLACE.

Spiral cable

If the driver front air bag has deployed:

REPLACE the spiral cable.

Occupant classification system (Passenger seat)

  1. Remove passenger seat assembly.

  2. Check control unit case for dents, cracks, or deformities.

  3. Check connectors for damage and terminals for deformities.

  4. Check seat frame and cushion pan for dents or deformities.

  5. If no damage is found, reinstall seat with new fasteners.

  6. If damaged — REPLACE seat cushion assembly with new fasteners.

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

Harness and connectors

  1. Check connectors for poor connection, damage, and terminals for deformities.

  2. Check harness for binding, chafing, cuts, or deformities.

  3. If no damage is found, reinstall the harness and connectors.

  4. If damaged — REPLACE the damaged harness. Do not attempt to repair, splice or modify any SRS harness.

Instrument panel assembly

If the front passenger air bag and/or knee air bag has deployed:

REPLACE the instrument panel assembly. (integrated type)

FOR FRONTAL COLLISION: When SRS is not activated in a collision

CAUTION:

Due to varying models and option levels, not all parts listed in the chart below apply to all Nissan Sentra vehicles.

WORK PROCEDURE

Before performing any of the following steps, ensure that all Nissan Sentra vehicle body and structural repairs have been completed.

Check the SRS components using the table below:

Replace any SRS components showing visible signs of damage. (dents, cracks and deformation, etc.)

Perform self-diagnosis using CONSULT or air bag warning lamp. Refer to Trouble Diagnosis with CONSULT for details.

Ensure entire SRS operates properly.

After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to Special Repair Requirement.

SRS INSPECTION (FOR FRONTAL COLLISION)

Part

Inspection

Driver air bag module

If the driver air bag has NOT been activated:

  1. Remove driver air bag module. Check harness cover and connectors for damage, terminals for deformities, and harness for binding.

  2. Install driver air bag module into the steering wheel to check fit and alignment with the wheel.

  3. If no damage is found, reinstall with new fasteners.

  4. If damaged — REPLACE. Install driver air bag modules with new fasteners.

Driver knee air bag module

If the driver knee air bag has NOT been activated:

  1. Remove driver knee air bag module. Check harness cover and connectors for damage, terminals for deformities, and harness for binding.

  2. Install driver knee air bag module into the instrument panel to check fit with the instrument panel.

  3. If no damage is found, reinstall with new fasteners.

  4. If damaged—REPLACE. Install driver knee air bag module with new fasteners.

Front passenger air bag module

If the front passenger air bag has NOT been activated:

  1. Remove front passenger air bag module. Check harness cover and connectors for damage, terminals for deformities, and harness for binding.

  2. Install front passenger air bag module into the instrument panel to check fit with the instrument panel.

  3. If no damage is found, reinstall with new fasteners.

  4. If damaged — REPLACE. Install front passenger air bag modules with new fasteners.

Front passenger knee air bag module

If the front passenger knee air bag has NOT been activated:

  1. Remove front passenger knee air bag module. Check harness cover and connectors for damage, terminals for deformities, and harness for binding.

  2. Install front passenger knee air bag module into the instrument panel to check fit with the instrument panel.

  3. If no damage is found, reinstall with new fasteners.

  4. If damaged—REPLACE. Install front passenger knee air bag module with new fasteners.

Crash zone sensor

If the front air bags or seat belt pre-tensioners have NOT been activated:

  1. Remove the crash zone sensor. Check harness connectors for damage, terminals for deformities, and harness for binding.

  2. Check for visible signs of damage (dents, cracks, deformation) of the crash zone sensor and bracket.

  3. Install the crash zone sensor to check fit.

  4. If no damage is found, reinstall with new fasteners.

  5. If damaged — REPLACE the crash zone sensor and bracket with new fasteners.

Seat belt pre-tensioner assemblies

(All applicable locations: buckle, retractor, lap outer)

If the pre-tensioners have NOT been activated:

  1. Remove seat belt pre-tensioner assembly.

    Check harness cover and connectors for damage, terminals for deformities, and harness for binding.

  2. Check belts for damage and anchors for loose mounting.

  3. Check retractor for smooth operation.

  4. Check seat belt adjuster for damage.

  5. Check for deformities of the center pillar inner.

  6. If no damage is found, reinstall seat belt pre-tensioner assembly with new fasteners.

  7. If damaged —REPLACE. Install the seat belt pre-tensioner assembly with new fasteners.

Diagnosis sensor unit

If none of the SRS components have been activated:

  1. Check case for dents, cracks or deformities.

  2. Check connectors for damage, and terminals for deformities.

  3. If no damage is found, reinstall with new fasteners.

  4. If damaged — REPLACE. Install air bag diagnosis sensor unit with new fasteners.

Steering wheel

  1. Visually check steering wheel for deformities.

  2. Check harness (built into steering wheel) and connectors for damage, and terminals for deformities.

  3. Install driver air bag module into the steering wheel to check fit and alignment with the wheel.

  4. Check steering wheel for excessive free play.

  5. If no damage is found, reinstall.

  6. If damaged — REPLACE.

Spiral cable

If the driver front air bag has not deployed:

  1. Visually check spiral cable and combination switch for damage.

  2. Check connectors and protective tape for damage.

  3. Check steering wheel for noise, binding or heavy operation.

  4. If no damage is found, reinstall.

  5. If damaged — REPLACE.

Occupant classification system (Passenger seat)

  1. Remove passenger seat assembly.

  2. Check control unit case for dents, cracks, or deformities.

  3. Check connectors for damage and terminals for deformities.

  4. Check seat frame and cushion pan for dents or deformities.

  5. If no damage is found, reinstall seat with new fasteners.

  6. If damaged — REPLACE seat cushion assembly with new fasteners.

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

Harness and connectors

  1. Check connectors for poor connection, damage, and terminals for deformities.

  2. Check harness for binding, chafing, cuts, or deformities.

  3. If no damage is found, reinstall the harness and connectors.

  4. If damaged ——REPLACE the damaged harness. Do not attempt to repair, splice or modify any SRS harness.

Instrument panel assembly

If the passenger front air bag has NOT deployed:

  1. Visually check instrument panel for damage.

  2. If no damage is found, reinstall the instrument panel assembly.

  3. If damaged—REPLACE the instrument panel assembly.
Collision Diagnosis
...

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