Nissan X-Trail Owners Manual | 2024
3.5.1.7. SRS air bag warning light
The supplemental air bag warning light, displaying 
in the meter monitors the circuits for the air bag systems, pre-tensioner seat belt system and all related wiring.
When the ignition switch is in the ON position, the SRS air bag warning light illuminates for about 7 seconds and then turns off. This indicates that the SRS air bag systems are operational.
If any of the following conditions occur, the air bag and/or pre-tensioner seat belt systems need servicing:
The SRS air bag warning light remains on after approximately 7 seconds.
The SRS air bag warning light does not illuminate at all.
Under these conditions, the air bag, pre-tensioner seat belt and/or occupant classification sensor systems may not operate properly. They must be checked and repaired. Contact a NISSAN dealer or qualified workshop immediately.