Any way to keep 12v on when car is off
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Thread: Any way to keep 12v on when car is off

  1. #1
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    Any way to keep 12v on when car is off

    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

    Sent from my E6653 using Tapatalk

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  3. #2
    Registered User John Clark's Avatar
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    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/D...Pdf?id=1068803
    2008 Odyssey Touring-Silver
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  4. #3
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    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
    30 year career of car sales and related industry
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  6. #4
    Registered User John Clark's Avatar
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    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!
    2008 Odyssey Touring-Silver
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    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.
    2015 EX - Shear Comfort seat covers, Husky Liners floor liners, OEM cargo liner, VCMuzzler, Street Guardian dashcam, Lubegard Red

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  8. #6
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    Quote Originally Posted by John Clark View Post
    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
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    Registered User John Clark's Avatar
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    Quote Originally Posted by davedrivesody View Post
    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
    Yeah, you'd only want to start it with low draw items like a mobile phone charger connected, and even then, that isn't good for your mobile device or your charger as you can get voltage drops and spikes during start.
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    Quote Originally Posted by CroMath View Post
    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.
    Thanks for all the info. What is a BDO device? Do u mean making a hole for a new cig lighter in the dash?

    Sent from my Nexus 10 using Tapatalk

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    Quote Originally Posted by John Clark View Post
    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/D...Pdf?id=1068803
    Thanks John, I will try to understand diagram and find pins 1 and 2. The front accessory power socket relay is a relay in the fuse box?

    If u have a picture that would help a lot.

    Sent from my Nexus 10 using Tapatalk

  12. #10
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    I don't have the location for the gen 4. I have it for the gen 3.
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    Quote Originally Posted by shadisoft View Post
    Thanks for all the info. What is a BDO device? Do u mean making a hole for a new cig lighter in the dash?

    Sent from my Nexus 10 using Tapatalk
    I believe he means a device such as this that allows power even though vehicle is off, yet protects the battery from discharging.

    https://www.blackvue.com/power-magic-pro/

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    Quote Originally Posted by EOT 4 Life View Post
    I believe he means a device such as this that allows power even though vehicle is off, yet protects the battery from discharging.

    https://www.blackvue.com/power-magic-pro/
    That's exactly right. It prevents your battery's voltage level from dropping below a pre-set level.
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    Registered User John Clark's Avatar
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    Quote Originally Posted by shadisoft View Post
    Thanks John, I will try to understand diagram and find pins 1 and 2. The front accessory power socket relay is a relay in the fuse box?

    If u have a picture that would help a lot.

    Sent from my Nexus 10 using Tapatalk
    Actually, It looks like it's relay #4 in the drawing below. Ignore the 23 right next to it. I think the 2 and 3 go with the arrows to the right. The drawings aren't great. Plug something in to the socket and make sure it's working. Then simply pull that relay and make sure it's the right one.

    Any way to keep 12v on when car is off-screenshot-2016-12-29-21.49.23.png
    2008 Odyssey Touring-Silver
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    Quote Originally Posted by shadisoft View Post
    Thanks for all the info. What is a BDO device? Do u mean making a hole for a new cig lighter in the dash?

    Sent from my Nexus 10 using Tapatalk
    "BDP" stands for Battery Drain Protection. It acts like a switch between the fuse for the always on circuit and the 12V socket. The power is allowed to flow until the voltage reaches a pre-set level and then switches itself off.

    As for mounting options, no one says you have to have it in the dash; as a matter of fact, I'd advocate against hacking up your dash. You could run the wire wherever you want. I'd be tempted to run it into the console or maybe the storage where the Coolbox would be for a stealthy look.
    2015 EX - Shear Comfort seat covers, Husky Liners floor liners, OEM cargo liner, VCMuzzler, Street Guardian dashcam, Lubegard Red

    If you don't like change, you're going to like irrelevance even less. - Eric Shinseki

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

    Much appreciated

    Sent from my E6653 using Tapatalk

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