Very complex problem - Anti-theft car won't start - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 4 (permalink) Old 02-14-2017, 09:43 AM Thread Starter
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Join Date: Feb 2017
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Question Very complex problem - Anti-theft car won't start

Hello everyone! To present myself a little bit, im from a northern region of Quebec in Canada and im an owner of a Mazda 3 2008 with only 91 000 km.

Im going to explain you the problem as detailed as possible.
This problem is intermittent... When I want to start my car in early morning (example), the engine won't crank at all when the key is on start. When the key is on ''on'', everything (radio and more) will show up. I will have the anti-theft light blinking rapidly on my dash.

To start my car, I let it sit on the ''on'' position for a couple of minutes. Sometimes 3 minutes, othertimes 10 minutes. And then, the parking light go on, I hear a sound in the engine, and the engine car can now be started up. Sometimes, after the engine started up, the anti-theft light is still blinking rapidly.

I can now drive my car, remove the key, leave the car for 3 hours and it will start up like nothing happened. The day after, in early morning, the car won't start up again... I most say this is winter in here. -20, -30, -40 celcius. The problem appeared 2 months ago. Theres is no scanner in my region to scan the code (if there's one). I tryed both keys I have, same problem is occuring. Disconnecting the battery while the key is on ''on'' position, heated the car in a garage. Nothing worked.

Any help is welcome.
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post #2 of 4 (permalink) Old 02-14-2017, 09:09 PM
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Join Date: Feb 2010
Location: nyc
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Originally Posted by Merlin123 View Post
Hello everyone!
Nothing worked.

Any help is welcome.
1. Check car battery charge %, report. Disconnect car battery and recharge to 100%. If car battery is more, than 4 years old REPLACE it.
2. Replace all key remotes batteries.
3. Try again to see car start after overnight. Report changes.

4. If NOTHING changed after 1.-3. and car battery still loses charge, then recharge car battery again to 100% and then open car fuse box and look which car circuit LEAKS electricity or is SHORT. Read car manual for fuse box circuit descriptions. Completely shutdown car and check with voltmeter, WHICH circuit is still ALIVE and is LEAKING electricity.

5. After localizing faulty circuit, localize faulty component on that circuit. Report.

Last edited by 008z; 02-14-2017 at 09:11 PM.
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post #3 of 4 (permalink) Old 02-15-2017, 08:53 AM Thread Starter
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Join Date: Feb 2017
Posts: 3
Thank you for your reply 008z.

My battery is not the issue, its 2 months old and everything is working (radio, subwoofer, light) when I turn the key on. I just can't start the engine.

For the fuses, I checked some of them. I will check for the others and take my hand on a voltmeter.
I also have an amp, a capacitor and a subwoofer at the back of my car. The capacitor is at least 10 years old but there's a fuse between the battery and the capacitor and amp. I'll remove the fuse and see if there's change.

I'm also going to defrost the car for a night or two this week.
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post #4 of 4 (permalink) Old 02-17-2017, 08:18 AM Thread Starter
Bicycle Rider
Join Date: Feb 2017
Posts: 3
Good morning!

So, to let you know, my car has been sleeping in a heaten garage for 2 nights in a row. I just tryed to start it and it started # 1 with no blinking anti-theft light.

Maybe it was just the cold... Those cars seems to be sensitive to it.

My theory is that humidity is getting glued to some electronic connections when the temperature is too cold. I had the worst time to start my car when the temp was below -20 because of the anti-theft protection.
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