2012 LE immobiliser key battery - Toyota Yaris Forums

danyboy · 10-09-2022, 04:33 PM

I am wondering if the 2012 LE immobilizer type key needs a battery replacement or it just gets charged when in the ignition ? I opened it up and can't acces any battery unless I remove some insulation tape ???

NYC-SE · 10-09-2022, 05:33 PM

Are you talking about the actual key, with the buttons you push to lock / unlock the doors?

If so yes it has a replaceable battery, CR2016 model. I have done this previously and there was no insulation tape present. Perhaps a previous owner jury-rigged it back together.

kevinj93 · 10-09-2022, 06:24 PM

There are two separate functions.

The immobiliser is an RFID type chip in the key. It respondes to a low power RF signal from the Transponder Key ECU. It is self powered from the RF signal.

The Remote Door Lock, if fitted uses a replaceable battery in the key grip to transmit a low power RF signal.

danyboy · 10-17-2022, 11:58 AM

Door lock works from far away so I assume battery mus still be good. It's just that twice I had a hard time cranking the engine. It would crank but not start. Would it have anything to do with my cell phone being just met to the key and interfering with the safety key signal ?

10-09-2022, 04:33 PM	#1
danyboy Drives: 2012 yaris Join Date: Aug 2022 Location: Drummondville, Canada Posts: 12	2012 LE immobiliser key battery I am wondering if the 2012 LE immobilizer type key needs a battery replacement or it just gets charged when in the ignition ? I opened it up and can't acces any battery unless I remove some insulation tape ???

10-09-2022, 06:24 PM	#3
kevinj93 Drives: 2013 NCP130 Join Date: Nov 2015 Location: Sydney, Australia Posts: 383	There are two separate functions. The immobiliser is an RFID type chip in the key. It respondes to a low power RF signal from the Transponder Key ECU. It is self powered from the RF signal. The Remote Door Lock, if fitted uses a replaceable battery in the key grip to transmit a low power RF signal. __________________ Running on standard AU 14" steel wheels (14x5 rims, 175/70R14 tyres). Added reversing camera and touch screen radio, cruise control, 16" rear wiper blade, tow bar and dash cam.

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10-09-2022, 05:33 PM	#2
NYC-SE Drives: 2014 Yaris SE Join Date: Apr 2014 Location: NYC Posts: 1,076	Are you talking about the actual key, with the buttons you push to lock / unlock the doors? If so yes it has a replaceable battery, CR2016 model. I have done this previously and there was no insulation tape present. Perhaps a previous owner jury-rigged it back together.

10-17-2022, 11:58 AM	#4
danyboy Drives: 2012 yaris Join Date: Aug 2022 Location: Drummondville, Canada Posts: 12	Door lock works from far away so I assume battery mus still be good. It's just that twice I had a hard time cranking the engine. It would crank but not start. Would it have anything to do with my cell phone being just met to the key and interfering with the safety key signal ?