Nissan 240SX/Altima 1993-1998 Repair Guide

General Information


See Figures 1 and 2

A Supplemental Restraint System (SRS), more commonly known as air bags, is installed in all 1994 and later vehicles. The system is designed to protect the driver and, on some vehicles, the front seat passenger from serious injury when the vehicle is involved in a frontal collision.

The system consists of an air bag mounted in the steering wheel, a control unit and various sensors. Those vehicles with front seat passenger protection also contain an air bag mounted above the glove box on the dashboard.

Air bag sensors are mounted behind the grille and under the console. Extreme caution should be exercised when working in these areas.

Click image to see an enlarged view

Fig. Fig. 1: All vehicles equipped with air bags will carry this label under the hood

Click image to see an enlarged view

Fig. Fig. 2: The front air bag sensor is located next to the hood latch. Extreme caution should be exercised when working around this sensor


Do not use a circuit tester to check SRS function.
Before servicing the SRS, turn the ignition OFF , disconnect both the negative, then the positive battery cables and wait at least 10 minutes.
Replace the air bag module if it has been dropped or sustained any impact.
Do not expose the air bag module to temperature exceeding 194°F (90°C).
Do not allow oil, grease or water to come in contact with the air bag module.
The diagnosis and senor units must always be mounted with the arrow pointing toward the front of the vehicle.
Check the diagnosis and sensor units for damage, deformities or rust prior to installation, and replace as required.
The spiral cable in the steering wheel must be aligned with the neutral position, since its rotations are limited. Do not attempt to turn the steering wheel or column after the steering wheel has been removed.
Handle air bags with extreme caution. Always place them with the pad side facing upward.
Do not use old bolts after their removal from any SRS parts. Always install SRS parts with new bolts of the proper type and strength.
In the event of air bag inflation, the front instrument panel assembly should be replaced.


Before servicing the SRS, turn the ignition OFF , and disconnect the negative, then positive battery cables, and wait at least 10 minutes.

It is still possible for the air bag to deploy for up to 10 minutes after the cables are removed. Therefore, do not work on any air bag system connectors or wires until at least 10 minutes have passed.


Connect the positive, then the negative battery cables. Turn the ignition switch ON and wait for the air bag warning lamp on the instrument panel to illuminate. The warning lamp will turn off after approximately 7 seconds if no malfunctions are present. If the warning lamp does not function as stated, the SRS system should be inspected by a qualified technician.