Any way to keep 12v on when car is off

shadisoft · Dec 29, 2016

Hi,

I bought an odyssey 2014 and what I miss is having the 12v cig lighter plug on when car is off. Is there an easy way to change the current behaviour?

Thanks

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John Clark · Dec 29, 2016

You can remove the relay and insert a jumper on pins 1 & 2 on the front accessory power socket relay. See diagram below. However, if you leave anything plugged in you risk draining your battery.

http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=1068803

davedrivesody · Dec 29, 2016

John Clark said:
However, if you leave anything plugged in you risk draining your battery.

Yes, and also the plugged-in load will continue to draw power while starting the engine. That could cause a no-crank situation if the battery is low.

Dave

pkrface · Dec 29, 2016

It's surprising that Honda has held out so long on the 12V power issue. My company car, 2016 Ford Explorer, has retained power to the 12V outlets for a period of time which is nice. I can leave my phone in the car to charge while I'm in a meeting, at lunch, etc. I don't know for sure how long the timer is or if it is based on voltage drop, but both technologies exist at very low cost so it would be nice if Honda incorporated it into future models.

John, you're just the kind of guy to create a jumper with a timer built in! I'd buy it

hpdad · Jan 11, 2017

Well, depends on what people's need. For me, this is good thing because I use the socket for dash cam camera. I don't want power stays on when the car is off.

I had Toyota Tundra before was like that. I had to get a usb adapter so I could turn on/off every time. Hated it.

John Clark · Dec 29, 2016

It'd be a whole added module. Wouldn't be too hard for an electrical engineer to develop. I'm far from an electrical engineer! I could do it...it just wouldn't be pretty!

CroMath · Dec 29, 2016

A much simpler solution is to add another 12V socket connected to an always-on circuit with a BDP device - basically wiring in a dashcam for parking mode without actually plugging in the camera.

Total cost would be around $40 and total time invested maybe an hour.

shadisoft · Dec 30, 2016

Thanks for all the info. What is a BDO device? Do u mean making a hole for a new cig lighter in the dash?

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John Clark · Dec 30, 2016

I don't have the location for the gen 4. I have it for the gen 3.

shadisoft · Dec 31, 2016

Thanks a lot all. All great info. I have excellent info now to make my change.

Much appreciated

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fishEH · Dec 31, 2016

I went to attempt this just now and encountered this when trying to pull the passenger side trim?
What is this witchcraft and how does one defeat it!??

shadisoft · Jan 1, 2017

John, looked on my manual.. It's for 2014 oddy could it be different. I think mine is in driver side box and it's 13? (accessory)?

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John Clark · Jan 1, 2017

That's the fuse for it but not the relay. You need to go to the relay. I brought up the Electrical Troubleshooting Manual again and it looks like it's actually #7 in the diagram for the passenger side fuse panel. This manual is 100% online and each browser renders it a bit differently.

shadisoft · Jan 3, 2017

Thanks John.. I will take a look again. I later thought that user manual only has the fuses but thanks for the confirmation and the info.

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shadisoft · Jan 3, 2017

My passenger under dash fuse box looks different.

I only see one relay. What am I missing?

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Any way to keep 12v on when car is off

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