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Old 01-10-2016, 10:07 PM   #1
Sigboi
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Is there an accessory or power with ignition on wire in the trunk lid?

Hey Everyone,

I'm looking to wire in a rear view camera, but one of the wifi ones that connect to your phone.

Works great, but is a bit slow to connect to the phone at first, which is why I don't want to connect it to the rear lights.

I'd like to have it on with ignition on. I have been searching on the forum, but have only found wires with accessory power in the trunk, no mention of in the trunk lid.

Is there such a wire in the trunk lid?

Thank you
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Old 01-12-2016, 10:00 PM   #2
iowna330xi
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Try the trunk button maybe? Other than that, there is not much I can think of
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Old 01-12-2016, 11:22 PM   #3
generalvp
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Other than the license plate lights, trunk open switch and tail lights, I think you're out of luck. Connecting via bluetooth to your phone for a reverse backup camera seems like a headache. Opening the app every time I want to reverse and then waiting for bluetooth connection before putting it in reverse....that's just way too long.
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Old 01-13-2016, 08:25 AM   #4
markusmarkus
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I think you're going to have to run a wire into the trunk lid. You'll have to remove the trunk lid liner and the tool kit. There are 2 very small philips head screws towards the bottom of the liner. They're hard to see as they are painted the color of the liner. The license plate light assembly comes off easily as it's held in place with four torx screws. The assembly has a small connector on the end of a couple short wires.
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Old 01-16-2016, 06:46 PM   #5
Sigboi
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Quote:
Originally Posted by generalvp View Post
Other than the license plate lights, trunk open switch and tail lights, I think you're out of luck. Connecting via bluetooth to your phone for a reverse backup camera seems like a headache. Opening the app every time I want to reverse and then waiting for bluetooth connection before putting it in reverse....that's just way too long.
Thanks for your input, would there be any constant power wires in there as an alternative?

The way this one works is by wifi, so the signal is a bit stronger and faster. I wanted to hook it up to ignition power or constant power, so that when I start the car, the phone's already connected, and I can just hit the app on the phone screen whenever I need to see the camera view.

Once it's connected by wifi, it's instant on when I hit the app, so it works pretty well when I tested it. I just need to find a wire to tap, and it looks like I have to go through that grommet to the body to find one
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Old 01-16-2016, 07:02 PM   #6
Sigboi
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Originally Posted by markusmarkus View Post
I think you're going to have to run a wire into the trunk lid. You'll have to remove the trunk lid liner and the tool kit. There are 2 very small philips head screws towards the bottom of the liner. They're hard to see as they are painted the color of the liner. The license plate light assembly comes off easily as it's held in place with four torx screws. The assembly has a small connector on the end of a couple short wires.
I have it apart, and I had run the wire for the camera through the trim and into the trunk lid. I'm just trying to figure out where is the closest accessory power or constant power wire is to tap. If it's in the body, then I would have to run a wire through that bundle that connects the trunk lid to the body
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Old 01-16-2016, 07:30 PM   #7
wayne0
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The closest constant power would be the battery.
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Old 01-17-2016, 09:13 AM   #8
markusmarkus
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Is there an accessory or power with ignition on wire in the trunk lid?

Quote:
Originally Posted by wayne0 View Post
The closest constant power would be the battery.

True, but that's mean the camera has power at all times!

OP, I think your best bet is to run a wire from the amplifier in the trunk. The wire you need to splice into is the amplifier turn on wire. In my 2001 330CI it's an off white wire. How many milliamperes (ma) does the camera use? The turn on wire comes from the head unit and it can't handle a major current draw. You could use it to energize a relay. The normally open relay would get power from the battery so that when the head unit is on, the relay coil will be energized and the relay contacts would close and camera would get power from the battery. www.mouser.com is a great source of electronix and electrical stuff.

Last edited by markusmarkus; 01-17-2016 at 09:13 AM.
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Old 01-18-2016, 06:01 PM   #9
Sigboi
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True, but that's mean the camera has power at all times!

OP, I think your best bet is to run a wire from the amplifier in the trunk. The wire you need to splice into is the amplifier turn on wire. In my 2001 330CI it's an off white wire. How many milliamperes (ma) does the camera use? The turn on wire comes from the head unit and it can't handle a major current draw. You could use it to energize a relay. The normally open relay would get power from the battery so that when the head unit is on, the relay coil will be energized and the relay contacts would close and camera would get power from the battery. www.mouser.com is a great source of electronix and electrical stuff.
Yeah, I was thinking if the draw wasn't too bad, a constant on would be ok if no accessory wire is close by.

Could you tell me where the amp is? I don't have the harmon kardon sound system.

Here's the spec sheet from the camera.

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Old 01-18-2016, 06:08 PM   #10
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STUPID QUESTION HERE
Why would you connect to a switched hot from the key instead of picking up the hot from the Reverse Lights? The reverse lights come on when the car is in R, and this is when you want to see what's happening behind the car. I'd not use the R signal directly, I would use it to power a relay that passes power through the contacts to the camera. A switched hot from the key makes the camera hot any time that the car is on, but switching the hot from the backup lights makes the camera work only when the gear selector is in R.
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Old 01-18-2016, 06:24 PM   #11
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I was wondering when someone was going to suggest this.
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Old 01-18-2016, 06:33 PM   #12
Sigboi
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Quote:
Originally Posted by jdstrickland View Post
STUPID QUESTION HERE
Why would you connect to a switched hot from the key instead of picking up the hot from the Reverse Lights? The reverse lights come on when the car is in R, and this is when you want to see what's happening behind the car. I'd not use the R signal directly, I would use it to power a relay that passes power through the contacts to the camera. A switched hot from the key makes the camera hot any time that the car is on, but switching the hot from the backup lights makes the camera work only when the gear selector is in R.
If you had read the rest of the thread above, you'd see why I want to have it hot while the car is key on.

The wifi camera is too slow to connect to have it power on with reverse, about 10secs to connect to phone after power on.

With key on, I can have it connected to my phone while the car is running and be able to toggle the camera instantly when I need it.

Last edited by Sigboi; 01-18-2016 at 06:34 PM.
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Old 01-18-2016, 08:24 PM   #13
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A spec sheet in name only.
You could hook it into the tail light wiring. That way you would only need to turn the parking lights on to power it up. See how often you actually use it before you go to the trouble of running a wire to anywhere.
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Old 01-19-2016, 02:31 AM   #14
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Originally Posted by iowna330xi View Post
Try the trunk button maybe? Other than that, there is not much I can think of
That's about it, or run new wires through the rubber boot towards the lid
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Old 01-19-2016, 08:36 AM   #15
markusmarkus
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Is there an accessory or power with ignition on wire in the trunk lid?

The amp is in the left side of the trunk behind the carpet liner. It's a bit of a bear to remove as its stiff. Your car is a 2003MY so the wire should be cream colored. It has 12VDC whenever the head unit is on. It's the "turn on" signal for the amp. Remember, this wire/circuit won't provide much current as it's a signal and not power.

www.mouser.com is a great source for electrical and electronic parts. I'm sure you can find a proper relay at that site.

Last edited by markusmarkus; 01-19-2016 at 08:37 AM.
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Old 01-22-2016, 09:42 AM   #16
Sigboi
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Update:

I took my time and tested all the wiring in the lid with key on, off, doors locked/unlocked, etc, and the solution is to wire it to the trunk switch connector that links to the rest of the harness. I'll try to take a pic later on, but it was tricky as I was testing the wires with the trunk open, and I wasn't finding what I wanted, I could only find power when reverse lights were on, I couldn't find power on any of the wires besides that one.

Finally I thought that maybe depending on if the trunk was open or closed, certain wires got power. I used a pen to move the trunk latch into "latched" position, and the white/brown wire got power. So when the trunk is closed the camera got power.

Better yet, when I lock the doors, that wire loses power, so I don't have to worry about the camera being constantly on. So close enough to my wanting "key on" power!

Last edited by Sigboi; 01-22-2016 at 09:43 AM.
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Old 01-22-2016, 12:54 PM   #17
generalvp
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That's an interesting wire to connect to. I guess you'll just have to unlock your doors every time you need to use the reverse camera.
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Old 01-22-2016, 10:53 PM   #18
Sigboi
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Originally Posted by generalvp View Post
That's an interesting wire to connect to. I guess you'll just have to unlock your doors every time you need to use the reverse camera.
I was actually playing around with it today, and it works with the doors locked as well. Turns out power is on as long as the trunk is closed and the key is on doors locked or unlocked.
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