How do you turn off a 2003 Saab 9-3 car alarm without the key?

To turn off a 2003 Saab 9-3 car alarm without the key, you can try disconnecting the battery. Open the hood and locate the battery; then, carefully remove the negative terminal cable to cut the power to the alarm system. Alternatively, if you have access to the interior, you can also try locking and unlocking the driver's door with the manual key or using the override button, if available. If these methods don't work, contacting a professional locksmith or a Saab dealer may be necessary.