Car Alarms: toyota immobiliser, valet mode, toyota corolla

Question
i have a 1990 toyota corolla executive,it is parked off road and the battery has gone flat,after re charging the battery the factory fitted scorpian alarm works fine,but the immobiliser does not seem to de activate when dis arming the alarm. so when i turn the ignition key nothing happens ,then the alarm activates. any advice would be welcome !

Answer
Seems the system is reset, and needs
to be done again.

Probably when it lost power.

Right, Ok, try this.
Put the key in the ignition, and turn forward
all the way just before cranking. Then within
5 seconds, press and hold in the valet/override
button, found under the dash area, usually to the left
of the leg, drilled into a plastic panel.
Might even be part of an on glass antenna
in the windshield if it's a remote starter,
until the installed LED (the blinking light)
in your dash area goes off, and the siren chirps twice.
(Your valet switch might be the toggle (on/off) type.
in this case, key on, flip switch in opposite direction,
key off.)

This should reset the alarm and allow you to
go on your way.

Just Repeat these steps to place it
back to valet mode.

That should do it.

Good luck.

ALARMTEK