Yes, there's a aftermarket alarm installed recently. Ignition light u referring to, is it the keyhole? how did u solve ur problem?
My situation is, last week battery gone flat. unplugged the +- and recharged it with a charger.
everything works fine as usual until on the same day i drove it to office n left it for few hours. after that i tried to start it, it can be cranked but unable to start. the throttle % isn't giving any respond on the screen when stepped on it.
and the immobilizer RED LED was ON. No solution and called for carrier and car being carried back home. After 2 days, it back to normal again. Then next day, it gone back to the same problem.