Nissan Maxima Service and Repair Manual: SRS air bag system

SRS Configuration

The air bag deploys if the air bag diagnosis sensor unit is activated while the ignition switch is in the ON or
START position.
The collision modes for which supplemental restraint systems are activated are different among the SRS systems.
For example, the driver air bag module, front passenger air bag module and front seat belt pre-tensioners
are activated in a frontal collision but not in a side collision.
SRS configurations for some collision modes are as follows:

SRS Component Parts Location

1. Crash zone sensor
2. Spiral cable
3. Front passenger air bag off indicator
4. Front LH seatbelt pre-tensioner
   LH side air bag (satellite) sensor
5. Air bag diagnosis sensor unit
6. Front LH side air bag module
7. Seat belt buckle switch (LH)
   Seat belt buckle switch (RH)
8. Occupant classification system
   control unit and sensor mat
9. Front RH seatbelt pre-tensioner
   RH side air bag (satellite) sensor
10. Front RH side air bag module
11. RH side curtain air bag module
12. LH side curtain air bag module
13. Front passenger air bag module
14. Driver air bag module

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 located behind the instrument
panel assembly. It operates with the SRS system in a frontal collision
exceeding a specified level. Refer to SRC-10, "Occupant Classification
System (OCS)" for more information.

Front Side Air Bag

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

Side Curtain Air Bag

Side curtain air bag modules are located above the vehicle headlining.
Vehicles with side curtain air bags are equipped with labels as
shown.

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. 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.

SRS Component Connectors

DIRECT CONNECT

The following SRS components use direct-connect style harness connectors.

• Driver front air bag module
• Passenger front air bag module
• LH side curtain air bag module
• RH side curtain air bag module
• Front LH seat belt pre-tensioner
• Front RH seat belt pre-tensioner

Always pull up to release locking tab prior to removing connector from SRS component.
Always push down to lock locking tab after installing connector to
SRS component. When locked, the locking tab is level with the connector
housing.

SLIDE DOUBLE LOCKING

• A new style slide double locking type connector is used on certain systems and components, especially
  those related to airbag control systems.
• The slide double locking type connectors help prevent incomplete locking and accidental looseness or disconnection.
• The slide double locking type connectors are disconnected by pushing or pulling the slider. Refer to the figure
  below.

CAUTION:

• Do not pull the harness or wires when disconnecting the connector.