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Matt
Matt, Mechanical Engineer
Category: Toyota
Satisfied Customers: 21883
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Hi. I have a 2002 mk3 mr2 and I cannot disarm the alarm. The

Customer Question

Hi. I have a 2002 mk3 mr2 and I cannot disarm the alarm. The key fob opens the door ok and the car starts ok but the alarm keeps going off. Any thoughts please. Nick
Submitted: 4 years ago.
Category: Toyota
Expert:  Shantal-Mod replied 4 years ago.

Hello Nick,

I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.

I wonder whether you're ok with continuing to wait for an answer. If you are, please let me know and I will continue my search. If not, feel free to let me know and I will cancel this question for you.

Thank you,

Shantal

Customer: replied 4 years ago.


Hi.


 


Think I may have sorted the problem but please leave open for the moment.


 


Regards


 


Nick

Expert:  Shantal-Mod replied 4 years ago.

Hello Nick,

Thanks for letting me know. In the meantime as requested I will continue to look for a Professional to assist you. However, should your situation change, please let me know.


Thank you for your patience,

Shantal

Expert:  Matt replied 4 years ago.

Hello


I'd try resetting the ECU by disconnecting the battery cables and clamping them together for 10 mins. Remove both battery leads from the battery then use a nut and bolt or G-clamp to hold both battery lead terminals together.

This discharges any capacitors / memory within the ECU and around the car so ensures all memory settings are wiped clear - back to the factory default.

This will reset all the systems on the car and you may need the radio security code to get it going again, and ensure that the keys are in your hand when you re-connect the battery as the car may lock and turn on the alarm