DTC B2500: Airbag Warning Lamp Failure: Reference
WARNING: This page is about a different car, the 2006 Suzuki Reno and 2006 Suzuki Forenza. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition switch is turned ON, in case of normal, the warning lamp blinking 7 times during 7 seconds. But in case, the warning lamp stays "ON" or blinking a second after above normal blinking (7 times during 7 seconds), then it is regarded as a defect (old or current) presents. Please check the defect with scan tool.