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Auto idle plus battery warning light

Old 03-11-2019
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Auto idle plus battery warning light

Hi,
On Friday I got a warning light on my 2014 9th Gen Civic it has the auto idle sign and a battery. I looked it up in the manual and it said it might not be detecting the battery charge, disconnect the negative, reconnect and drive around. I found this odd advice and haven't yet done this. I set off driving to work (35 miles) and now in addition to that I got to a point where there was a warning beeping every second but before it had chance to show me anything it cleared, I think it was trying to say the boot was open (which it wasn't).

So it sounds like a new battery my fix this, but also perhaps it is the alternator. What does anyone think, should I head to halfords and get a new battery (It has never had one since new) or go to a garage as it may be something related to the battery not getting charged?

Thanks
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Old 03-11-2019
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Re: Auto idle plus battery warning light

battery is probably toast, however you should check if the alternator is charging, do you have a multimeter?
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Re: Auto idle plus battery warning light

I do have a multimeter, How would I check if it is charging?
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Re: Auto idle plus battery warning light

check voltage at the battery with the car off
and then check it again with the engine running
post your readings here
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Old 03-11-2019
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Re: Auto idle plus battery warning light

Originally Posted by Colin42 View Post
check voltage at the battery with the car off
and then check it again with the engine running
post your readings here
Ah thanks. I just did this 12.00V with the engine off and 14.00V running which from what I can gather means the alternator is doing its job. Is that right?

Last edited by danped; 03-11-2019 at 04:22 PM.
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Old 03-11-2019
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Re: Auto idle plus battery warning light

Seems like it, throw a battery at it and see what happens
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Old 03-12-2019
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Re: Auto idle plus battery warning light

Originally Posted by danped View Post
auto idle sign
???
What fault codes does it have?
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Re: Auto idle plus battery warning light

Hi Not sure of the fault codes as I haven;t tried that. I can just see the warning Stop start + battery is shown. Garage just told me it was at 54% so I'm getting a replacement battery shortly. Many thanks for your help. I'll post again if a new battery doesn't fix it.
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Re: Auto idle plus battery warning light

the warning Stop start + battery is shown.
There's gonna be fault codes, but a basic engine code reader may not be able to display all of them.

For the LIN network code (charge warning light), check if any of the tiny wires broke on the battery current sensor on the neg post,
I don't even want to guess at codes for pushbutton start system
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