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Old 08-14-2018, 05:13 PM   #1
SlickWRX
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Default Noob jumpstart question

So I've jumpstarted many cars in my day but now I just tried to do it with my 2015 STI. As soon as I connect the negative cable to the strut nut the car gets instant full cluster power but the horn starts blaring. The car still won't start but the horn is going to town. I checked the manual and there was nothing about this in the jump starting section. I pushed it back in the garage for now. Is this something with the OEM alarm or maybe the Lojack? At first I thought it was because the key was too far away from the driver seat because it said key not detected. Then I moved the key closer but still same result. It's push button start with keyless entry.
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Old 08-14-2018, 10:12 PM   #2
caschnd1
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Sounds like the alarm was set off. Did you try hitting the door unlock button on your key fob to clear it?
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Old 08-14-2018, 10:44 PM   #3
Charlie-III
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Originally Posted by caschnd1 View Post
Sounds like the alarm was set off. Did you try hitting the door unlock button on your key fob to clear it?
Agreed.
Various years of Subaru alarm (that I have dealt with) goes off when you restore power, it will also kill the starter circuit.
So, have fob ready, do last jumper cable connection, hit "unlock" on the fob, then try starting.

Note, the system may have forgotten the fob, so you may need to re-pair it. Check in the security/stereo section here in the stickies.
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Old 08-15-2018, 11:21 AM   #4
SlickWRX
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Coincidentally the battery in the keyfob went dead at the same time. Replaced it and got it going. Thanks for pointing me in the right direction.
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Old 08-15-2018, 01:15 PM   #5
caschnd1
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Glad to hear you got it sorted.

Just in case anyone isn't aware... when the key fob battery goes dead, you can still start the car. You just have to place the key fob right against the push button when you try to start the car. Some people actually use the key fob to push the button. There is an antenna in the push button that can scan the chip in the key fob when it's close to the button (within an inch or so).

-Craig
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Old 08-15-2018, 04:00 PM   #6
Charlie-III
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Quote:
Originally Posted by Charlie-III View Post
Agreed.
Various years of Subaru alarm (that I have dealt with) goes off when you restore power, it will also kill the starter circuit.
So, have fob ready, do last jumper cable connection, hit "unlock" on the fob, then try starting.

Note, the system may have forgotten the fob, so you may need to re-pair it. Check in the security/stereo section here in the stickies.
Quote:
Originally Posted by SlickWRX View Post
Coincidentally the battery in the keyfob went dead at the same time. Replaced it and got it going. Thanks for pointing me in the right direction.
Thanks for the update and thread closure.

Quote:
Originally Posted by caschnd1 View Post
Glad to hear you got it sorted.

Just in case anyone isn't aware... when the key fob battery goes dead, you can still start the car. You just have to place the key fob right against the push button when you try to start the car. Some people actually use the key fob to push the button. There is an antenna in the push button that can scan the chip in the key fob when it's close to the button (within an inch or so).

-Craig
Depends on the alarm and year. Older didn't matter.
My 98 has no pushbutton, neither did our 99 Impreza L.
Both had OEM remote entry and alarm.
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Old 08-15-2018, 04:53 PM   #7
caschnd1
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Quote:
Originally Posted by Charlie-III View Post
Depends on the alarm and year. Older didn't matter.
My 98 has no pushbutton, neither did our 99 Impreza L.
Both had OEM remote entry and alarm.
My comment only applies to pushbutton start system which is what the OP was dealing with.
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Old 08-15-2018, 05:04 PM   #8
Charlie-III
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Quote:
Originally Posted by caschnd1 View Post
My comment only applies to pushbutton start system which is what the OP was dealing with.
Granted, but most mfr's when you charge a dead battery or jump it, the alarm goes off.
I can only state for sure on key start Subaru, but most brands are similar.
Get power to the system, be ready to deactivate the alarm.

Good enough for you?
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