Try disconnecting the battery for 10 minutes or so. Reconnect it and then start the vehicle and see if the light turns off.
there unfortunatly is no relay switch for the horn. It is on a fused circuit usaually with the dome light and beeper that sounds when the door is open and after you start the vehicle
Try unlocking the vehicle at the front passenger door. This will disable the security system and shou8ld allow you to start the vehicle.
The battery is basicly used just to start your vehicle, the alternator is what generates your power once the vehicle is running. Which indicates you need a new battery, not an alternator. That is why you problem goes away after a jump start(boost). If it was the alternator the problem would not go away and your vehicle would have no lights and stall with no start. Either your battery is bad or the alternator is not charging.
You take the vehicle to a professional for repair. Working on the SRS can be very hazardous.
It is possible that a 1993 Toyota will not start when it is cold because the battery does not have enough cranking amps to start the vehicle. Check to make sure that the battery is large enough for the job and is also charging properly.
The Vintage Vehicle Show - 1993 was released on: USA:1993 Russia:2004
Have vehicle scanned to determine the problem - usually a problem in the emission control system
you might hit a puddle or a big bump that shook the vehicle to make the light come on
Try resetting the fuel cut off switch and see if the engine will start
1993 what?
constant draw on the battery? dome light on? old battery?