back up camera power from dual sources
Printed From: the12volt.com
Forum Name: Mobile Video, GPS, and Navigation
Forum Discription: Mobile Video Head Units, DVD Players, LCD and TFT Monitors, Navigation, GPS, PS2, PS3, XBox, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=135937
Printed Date: May 03, 2024 at 5:58 AM
Topic: back up camera power from dual sources
Posted By: highside
Subject: back up camera power from dual sources
Date Posted: January 27, 2014 at 4:58 PM
Greetings!
I have installed a back up camera on my truck and am able to successfully view the video image on my JVC KW-NSX600 head unit.
The camera is currently powered by a nearby reverse light on my bumper. Naturally, when I go into reverse, the head unit changes its display to reflect the video image. Works great, no problem there.
However, I would also like to use it while in Drive by selecting the "Camera" button on the head unit. This will allow me to monitor trailer/hitch condition while in Drive.
The radio (with Axxess GMOS-LAN-01 Factory Integration Adapter) does not have a specific camera power output that is activated when pushing the camera button on the screen. It is simply looking for an video input when the button is pressed.
I would like for the camera to be optionally powered on when:
1. The reverse lights are on (or reverse signal is present at the radio input).
AND
2. Selectively powered (via dash mounted switch) when in Drive.
I am grateful for this forum and am hopeful that someone has a diagram already created for this configuration. I would prefer a diagram as opposed to a written explanation.
Thanks!
Robert aka Highside
Hawkins, TX.
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Highside
Replies:
Posted By: highside
Date Posted: January 27, 2014 at 4:59 PM
The vehicle is a 2008 Chevrolet Silverado HD 2500 LT
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Highside
Posted By: oldspark
Date Posted: January 27, 2014 at 9:10 PM
An easy way that is independent of the HU button is another +12V switch via a diode to the reverse camera but you need to insert a 2nd diode in the existing camera's +12V feed to stop power feedback (turning the reverse lights on with the switch etc.
The diodes can be any 1N400x - typically 1N4004 oe 1N4007 - with their line-ends towards the camera's +12V input.
If the camare can't handle the diode voltage drop of ~0.7V, a relay can be added later.
Posted By: highside
Date Posted: January 28, 2014 at 11:37 AM
Thanks for your response, oldspark.
Please see if my drawing represents a workable plan...
 ------------- Highside
Posted By: oldspark
Date Posted: January 28, 2014 at 4:53 PM
Yep - that looks good noting that only a lit switch requires the CHASSIS / GROUND connection, and the "TO FUSE PANEL" might mean 'from reverse switch' or switched Rev +12V etc.
Posted By: highside
Date Posted: January 29, 2014 at 9:49 AM
Thank you, oldspark!
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Highside
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