Nina

:o We've notice a beeping noise after installing a new battery in our 1992 LS400. Could this be the air bag system?

Yes, that is exactly what it is doing---addtionally the security light is on and blinking when the beeps are happening, Does your's do that also?

How do I turn off the security system. I don't think I am turning it off correctly--when I attempt to open all four doors--because the internal light is flashing and there is a noise coming from the dashboard while I am driving. HELP!