i have a Celica gts 2003 manual. My problem is that i have the cruise, abs, and air bags flashing constanly. Its been like this for more then a year and ive had tookend it to the dealer but, weren't able to find the problem. The car idles normal when cold but when its warm it drops down to less then 1000. The only way ive seen to fix it is to fade my dash board to a minimum then. The lights go away and the idle go's to normal. Does someone know what might be cousing this problem. Thanks for all your support.

It sounds like a bad alternator sending bad power down the line. I would remove the alternator belt and see if anything changes.

This is what ive done so far. Ive removed the dashboard, unplug both plugs and start the car on. The rpm gauge with the red indicader still hooke up. Enguine sound normal. After pluging the white plug still normal but, then after pluging the blue plug rpm drops not a hole lot cuz motor is cold but it drops. When i plug the white plug it only shows abs solid on dashboard light on, gas meter on, and millege. The aftermarket gauge plate color changer was disconnected.