Car Won't Start and Idk Why. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

jomikeee · 11-30-2025, 08:31 PM

Hello!

So i have a 2015 FRS which has been sitting for a little while. i supercharged and now i am returning it back to normal.

which first had an OFT stage 2 tune and then i Etuned with an ecu tec.

as i removed the SC. i put the battery back(which was off for a period of time)
my car wont start now. when i turn my key to accessories mode, no Light, just a few Clicking noises, but i have power to my headlights.

battery is at 11.8v and my keyfob battery has been switched.

I try to read it with my oft and ecu tec but no response.

I haven't checked my ECU ground prongs and will at a better time.

But i was hoping if i can get some help by picking the communities brains and hopefully be pointed towards the right direction.

I would highly appreciate the feedback.

new2subaru · 11-30-2025, 09:05 PM

Your battery sounds low. It should read 12.5-12.6

I would have the battery tested if you don't have the tools to do it yourself.

norcalpb · 12-01-2025, 09:28 PM

Battery voltage only tells part of the story, you need to test for cold cranking amps.

Batteries most frequently die during 2 times of the year; when it gets hot and when it gets cold. Sound like you may have let it sit while it was getting colder out.

jomikeee · 12-06-2025, 01:48 PM

i think i found my issue,

i replaced my battery. still no power to accesory mode nor will it crank, but i get power to my headlights.

i started poking around with my multimeter and found one of the circuits is blown on the positive terminal. it'll go from 12v to .02 on the right side circuit.

part comes in tomorrow and hopefully this is the answer.

edit: for some reason the image wont load, but if imgur doesn't work later, i'll re upload

jomikeee · 12-06-2025, 01:52 PM

Opie · 12-08-2025, 09:31 AM

That'll do it....

jomikeee · 12-18-2025, 09:09 PM

haha everything turns on but doesn't crank.

immobilizer blinks on accessory mode with key on.
the starter doesn't have a lot of mileage, but i don't hear clicking. got a used one coming in and hopefully a swap works.
i even got a new key fob and that didnt work(needed one anyways)
also a Ignition starter coming in.

haha im trying to narrow down on everything.

Lantanafrs2 · 01-07-2026, 06:58 AM

Starter relay?

11-30-2025, 08:31 PM	#1
jomikeee Junior Member Join Date: May 2022 Drives: Scion FRS Location: Maryland Posts: 7 Thanks: 0 Thanked 3 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Car Won't Start and Idk Why. Hello! So i have a 2015 FRS which has been sitting for a little while. i supercharged and now i am returning it back to normal. which first had an OFT stage 2 tune and then i Etuned with an ecu tec. as i removed the SC. i put the battery back(which was off for a period of time) my car wont start now. when i turn my key to accessories mode, no Light, just a few Clicking noises, but i have power to my headlights. battery is at 11.8v and my keyfob battery has been switched. I try to read it with my oft and ecu tec but no response. I haven't checked my ECU ground prongs and will at a better time. But i was hoping if i can get some help by picking the communities brains and hopefully be pointed towards the right direction. I would highly appreciate the feedback.

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11-30-2025, 09:05 PM	#2
new2subaru Weight Weenie Join Date: Aug 2015 Drives: 15 FR-S Location: Canada Posts: 2,660 Thanks: 5,234 Thanked 2,434 Times in 1,397 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	Your battery sounds low. It should read 12.5-12.6 I would have the battery tested if you don't have the tools to do it yourself.

12-01-2025, 09:28 PM	#3
norcalpb Senior Member Join Date: Oct 2013 Drives: 2013 BRZ, 2023 Model 3 Location: SF Bay Area Posts: 2,345 Thanks: 1,256 Thanked 902 Times in 590 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Battery voltage only tells part of the story, you need to test for cold cranking amps. Batteries most frequently die during 2 times of the year; when it gets hot and when it gets cold. Sound like you may have let it sit while it was getting colder out.

12-06-2025, 01:48 PM	#4
jomikeee Junior Member Join Date: May 2022 Drives: Scion FRS Location: Maryland Posts: 7 Thanks: 0 Thanked 3 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	i think i found my issue, i replaced my battery. still no power to accesory mode nor will it crank, but i get power to my headlights. i started poking around with my multimeter and found one of the circuits is blown on the positive terminal. it'll go from 12v to .02 on the right side circuit. part comes in tomorrow and hopefully this is the answer. edit: for some reason the image wont load, but if imgur doesn't work later, i'll re upload

12-06-2025, 01:52 PM	#5
jomikeee Junior Member Join Date: May 2022 Drives: Scion FRS Location: Maryland Posts: 7 Thanks: 0 Thanked 3 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)

12-18-2025, 09:09 PM	#7
jomikeee Junior Member Join Date: May 2022 Drives: Scion FRS Location: Maryland Posts: 7 Thanks: 0 Thanked 3 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	haha everything turns on but doesn't crank. immobilizer blinks on accessory mode with key on. the starter doesn't have a lot of mileage, but i don't hear clicking. got a used one coming in and hopefully a swap works. i even got a new key fob and that didnt work(needed one anyways) also a Ignition starter coming in. haha im trying to narrow down on everything.

01-07-2026, 06:58 AM	#8
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,570 Thanks: 2,579 Thanked 3,132 Times in 1,684 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Starter relay?

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