Nissan Pathfinder: Srs Air Bag Control System - System Description

• Component Parts. Srs Air Bag Control System
• Diagnosis System (air Bag)

Component Parts. Srs Air Bag Control System Nissan Pathfinder SUV

Component Parts Location

Driver Air Bag Module

The driver air bag module is dual stage and located in the steering wheel assembly. It operates with the SRS system in a frontal collision exceeding a specified level.

Front Passenger Air Bag Module

The front passenger air bag module is dual stage and is located behind the instrument panel assembly. It operates with the SRS system in a frontal collision exceeding a specified level. Refer to System Description for more information.

Front Center Air Bag Module

Front center air bag module is built into seat back inside of driver seat. Front center air bag module mainly consists of air bag and inflator which inflates air bag. Front center air bag is installed to seat back inside stitch of driver seat indicating that front center air bag is equipped. Front center air bag inflates through seat back inside stitch of drivers seat.

Front Side Air Bag Module

Front side air bag modules are built into the front seatback assemblies. Vehicles with side air bags are equipped with labels as shown.

Rear Side Air Bag Module

Rear side air bag modules are built into the 2nd row seat back assemblies. Vehicles with side air bags are equipped with labels on the seat cushion outer finishers.

Side Curtain Air Bag Module

Side curtain air bag modules are located above the vehicle headlining. Vehicles with side curtain air bags are equipped with labels on the pillar upper finishers.

Front Seat Belt Pre-tensioner

The seat belt pre-tensioner system with load limiter is installed for both the driver's seat and the front passenger's seat. It operates simultaneously with the SRS air bag system in the event of a frontal collision with an impact exceeding a specified level.

When the frontal collision with an impact exceeding a specified level occurs, seat belt slack resulting from clothing or other factors is immediately taken up by the pre-tensioner (1) as well as the lap pretensioner (2). Nissan Pathfinder Vehicle passengers are securely restrained.

When passengers in a vehicle are thrown forward in a collision and the restraining force of the seat belt exceeds a specified level, the load limiter permits the specified extension of the seat belt by the twisting of the ELR shaft, and a relaxation of the chest-area seat belt web tension while maintaining force.

Rear Seat Belt Pre-tensioner

The seat belt pre-tensioner system with load limiter is installed for both the rear RH and LH. It operates simultaneously with the SRS air bag system in the event of a frontal collision with an impact exceeding a specified level.

When the frontal collision with an impact exceeding a specified level occurs, seat belt slack resulting from clothing or other factors is immediately taken up by the pre-tensioner Nissan Pathfinder Vehicle passengers are securely restrained.

When passengers in a vehicle are thrown forward in a collision and the restraining force of the seat belt exceeds a specified level, the load limiter permits the specified extension of the seat belt by the twisting of the ELR shaft, and a relaxation of the chest-area seat belt web tension while maintaining force.

Air Bag Diagnosis Sensor Unit

The air bag diagnosis sensor unit is located under the center console assembly. The air bag diagnosis sensor unit receives signals from multiple SRS sensors and controls the deployment of the air bags. The deployment of the air bags depends on the type and severity of the collision. The air bag diagnosis sensor unit has self-diagnosis capability through the use of the CONSULT as well as flash codes displayed by the air bag warning lamp.

Crash Zone Sensor

The crash zone sensor is located behind the radiator and underneath the front air duct. The crash zone sensor sends signals to the air bag diagnosis sensor unit during a frontal collision. This sensor may be identified by a yellow connector.

Rear Side Air Bag Satellite Sensor

The rear side air bag satellite sensors are located behind the luggage side lower finisher LH and RH. The rear side air bag satellite sensors send signals to the air bag diagnosis sensor unit during a side collision. These sensors may be identified by yellow connectors.

Front Door Satellite Sensor

The front door satellite sensors are located in the driver and passenger doors. The front door satellite sensors send signals to the air bag diagnosis sensor unit during a side collision. These sensors may be identified by yellow connectors.

Front Passenger Air Bag Off Indicator

Front passenger air bag OFF indicator indicates whether or not passenger air bag is in the activation mode based on the judgment of the occupant detection system.

Diagnosis System (air Bag) Nissan Pathfinder 2022

Diagnosis Description

CAUTION:

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to do so in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness connectors.

• Do not attempt to repair, splice or modify SRS wiring harnesses. If a harness is damaged, replace it with a new one.

• Keep ground connections clean.

HOW TO PERFORM TROUBLE DIAGNOSES FOR QUICK AND ACCURATE REPAIR

1. Obtain information about the symptom.

   • WHAT - vehicle model

   • WHEN - date, frequencies

   • WHERE - road conditions

   • HOW - operating conditions, symptoms, passengers

2. Perform Preliminary Check.

   • Battery

   • Fuses

   • Harness connections

DIAGNOSIS METHODS

SRS self-diagnosis results can be read by using the AIR BAG warning lamp or CONSULT.

The User Mode is for the customer (driver). This mode warns the driver of a system malfunction through the AIR BAG warning lamp.

The Diagnosis Mode is for the technician. This mode helps the technician locate the malfunctioning circuit or part.

SRS Operation Check

USER MODE

1. Press the push-button ignition switch from OFF to ON and check that the air bag warning lamp blinks.

2. Compare the blinking pattern with the examples in the table.

Trouble Diagnosis with CONSULT

1. Connect CONSULT.

2. DTC is displayed on SELF-DIAG RESULTS.

NOTE:

If a malfunction is not detected on SELF-DIAG RESULTS [CURRENT], but a malfunction is detected during SRS Operation Check, the following cases may exist:

• SELF-DIAG [PAST] memory might not be erased. Refer to SRS Final Check.

• SRS system malfunctions intermittently. Refer to Inspection Procedure.

Trouble Diagnosis without CONSULT

DIAGNOSIS MODE

NOTE:

Diagnosis Mode can not be entered if a malfunction is not detected in User Mode.

1. Ignition switch ON.

2. After AIR BAG warning lamp lights for 7 seconds, ignition switch OFF within 1 second.

3. Wait more than 3 seconds.

4. Repeat steps 1 to 3 two more times (3 times total).

5. Ignition switch ON.

SRS is now in Diagnosis Mode. Refer to Flash Code Index.

SRS History Check

SRS HISTORY CHECK

1. Check repair history of the SRS. If no repairs have been made, perform SRS Operation Check. If repairs have been made, GO TO step 2.

2. Erase "SELF-DIAG [PAST]" after repair. Refer to SRS Final Check.

SRS Final Check

DIAGNOSIS MODE

1. Connect CONSULT.

2. Confirm that zero point reset of OCS is complete.

3. If no DTCs are detected on “SELF-DIAG RESULTS [CURRENT]”, repair of SRS is completed. Go to step 4.

   If any DTCs are detected on “SELF-DIAG RESULTS [CURRENT]”, the malfunction has not been repaired completely or another malfunction is being detected. Perform SRS Operation Check again. Refer to SRS Operation Check.

4. Touch “ERASE”.

   NOTE:

   Touching “ERASE” will clear the SRS memory of the malfunction (“SELF-DIAG [PAST]”). If “SELF-DIAG [PAST]” is not erased, User Mode may show the previous system malfunction even if the malfunction has been repaired completely.

5. Check that no malfunction is detected in “SELF-DIAG [PAST]”.

6. Exit Diagnosis Mode and disconnect the CONSULT.

7. Perform SRS Operation Check. Refer to SRS Operation Check.

CONSULT Function (AIR BAG)

CAUTION:

After disconnecting the CONSULT vehicle interface (VI) from the data link connector, the ignition must be cycled OFF → ON (for at least 5 seconds) → OFF. If this step is not performed, the BCM may not go to ”sleep mode”, potentially causing a discharged battery and a no-start condition.

CONSULT can display each diagnostic item using the diagnostic test modes shown following.

CONSULT Function (OCCUPANT DETECTION)

WORK SUPPORT

CONSULT can display each diagnostic item using the diagnostic test modes shown following.

DATA MONITOR

NOTE:

The following table includes information (items) inapplicable to this Nissan Pathfinder vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items.

B2720 Corner Sensor [rl] ++++