wilkomagic Posted February 27, 2017 Share Posted February 27, 2017 My battery went flat on the supra and cant reset the alarm. Does anyone know how fix it. Its driving me nuts. Quote Link to comment Share on other sites More sharing options...
Rob W Posted February 27, 2017 Share Posted February 27, 2017 Have you tried turning off the small isolation alarm box with the key next to the battery? Quote Link to comment Share on other sites More sharing options...
Tyson Posted February 27, 2017 Share Posted February 27, 2017 Have you tried turning off the small isolation alarm box with the key next to the battery? This Quote Link to comment Share on other sites More sharing options...
Bobbeh Posted February 28, 2017 Share Posted February 28, 2017 Yours still going? Mine failed totally and had to be replaced. Quote Link to comment Share on other sites More sharing options...
Rob W Posted February 28, 2017 Share Posted February 28, 2017 Yours still going? Mine failed totally and had to be replaced. Yep still going strong! Quote Link to comment Share on other sites More sharing options...
Burna Posted February 28, 2017 Share Posted February 28, 2017 Same happened to mine many years ago while at GVN Coachworks. Car stood for awhile with a flat battery, they couldn't get around resetting the alarm, so had to have it ripped out and a clifford installed. Quote Link to comment Share on other sites More sharing options...
Rob W Posted February 28, 2017 Share Posted February 28, 2017 Best thing to do if the battery goes dead is: Its a know thing unfortunately with the UK factory Scorpion T5000 alarm that was fitted. Best thing to do when the battery dies is: Turn off alarm using the master key to the alarm isolation box. Disconnect from the car and re-charge battery. Place battery in the car and re-connect the positive terminal. Whilst holding your finger on the bonnet alarm trigger, re-connect the negative terminal to the car and turn on alarm using the master key to the alarm isolation box. Still holding your finger on the bonnet alarm trigger, use the key fob to turn on and off the alarm, job done. Quote Link to comment Share on other sites More sharing options...
Marcus GTE Posted February 28, 2017 Share Posted February 28, 2017 I usually just turn the ignition to "on" and keep pressing the arm/disarm button until I get a response. Then take key out and arm it then disarm it and that normally works. Takes a few tries. Also try pressing and holding. Quote Link to comment Share on other sites More sharing options...
Kev.O Posted October 15, 2017 Share Posted October 15, 2017 (edited) I now have this same problem. I've had a flat battery many a time so I guess it must be lick of the draw. I've tried all that has been mentioned in this thread and another one regarding the UK spec alarm. I now have an MOT booked for next week and despite the immobiliser connections being by passed at the ECU, with the alarm sounding and the hazards going as soon as I turn the key past the ignition there is nothing (the battery is fully charged). If I were to remove the master ECU (under the drivers seat from memory) will I be able to by pass this issue? And finally, does anyone know a decent auto alarm technician local to or will to travel to Bristol? Thanks in advance. Edited October 15, 2017 by Kev.O (see edit history) Quote Link to comment Share on other sites More sharing options...
Kev.O Posted October 15, 2017 Share Posted October 15, 2017 Update: Having removed the drivers seat and carpet and trying to work out the wiring, I removed the 30amp fuse from the bank of aftermarket fuse holders. Thinking this was the main power and that the alarm should be disabled I was surprised when I connected the main battery when the indicators weren't going but the security light still had power. A quick press of the black button and the remote re-synronised. Replaced the blade fuse and all back to normal. Spent the rest of the afternoon vacuuming and leather cleaning the seat as well as cleaning all the parts I removed. Quote Link to comment Share on other sites More sharing options...
Dnk Posted October 15, 2017 Share Posted October 15, 2017 Good result Kev Quote Link to comment Share on other sites More sharing options...
Kev.O Posted October 15, 2017 Share Posted October 15, 2017 Good result Kev Thanks Dunk, yes I'm over the moon. Having worked on the car today for a couple of hours, I've really fallen back in love with the Supra. Quote Link to comment Share on other sites More sharing options...
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