Immobilisers may intercept one of three circuits; typically the low-voltage ignition circuit and the fuel pump circuit. Some may also intercept the low-current starter motor circuit from the key switch to the relay. The Immobilisers can be set to intercept these circuits IF you use a key that has been copied or someone tried to start the car with the key for another car. Once activated, most of the time they are on a timer, meaning they will reset in 10 to 20 minutes. You can try and reset yours by disconnecting the battery, remove both cables and touch the two cables together for ten minutes. Now if you have a radio that needs codes to reset it be sure you have the codes before disconnecting the battery. Some Immobilisers use a magnetic switch to turn off the car. buy disconnecting the battery and touching the cables together you will kill the magnetic field and reset it. Hope this helps fixya up.
SOURCE: 2005 mazda six. car working fine one day next day
When ever a batter this new goes bad, it is either because it is not being charged, because there is something wrong with the charging system, or there is a constant drain even when the key is off.
To check the latter, with everything off, you remove a battery cable and see if the is any glow from a test light between the post and the cable. If there is, then you have something on that should not be, all the time. Then you pull fuses and disconnect things until it goes off.
To check if the charging system is not working, the easiest way it is to borrow a battery to get it started, (don't jump start a car if you can avoid it, because you can ruin an alternator when it starts, because it will kill itself trying to charge up that bad battery.) With the lights on, rev up the engine. They should get slightly brighter. Of with a volt meter, see it go from 12.5 to 13.5 volts, or so. If it does not go up, then your battery is all that was powering the car, and it won't last long like that.
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