Ignition controlled accessory.

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Lancsbob
Joined: Fri 15 Aug, 2014 17:35
Posts: 251

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Location: Ormskirk

Ignition controlled accessory.

Post by Lancsbob » Wed 17 May, 2017 11:24

Where's the easiest point to connect for an ignition controlled accessory? (Dash Cam)

Cheers Bob

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BladeRunner919
Joined: Fri 17 Feb, 2012 20:18
Posts: 2201

  Z3 roadster 1.9

Re: Ignition controlled accessory.

Post by BladeRunner919 » Wed 17 May, 2017 12:18

Depending on your definition of 'easy' if you remove the glovebox there is loads of wiring to tap into. I'm actually doing the same exercise, but wiring in an auto-dimming rear view mirror from a Z4. I found this general info from a member of another forum but haven't had the chance to validate it:

Green is hot in Run and Start
Green, White stripe is Run only
Black Green stripe is Start
Violet is Start, Run, and Accessory
Red, White stripe is +12v relay switched by the ECM
White, violet strip is dashboard light 0 to +12v (headlight switch dimmer)
Brown is always ground
Brown with a stripe is a switched or ohm modified ground.
(Thanks to Dan "PbFut" Rose for the info)

The feed for the stereo is a good one, because it's easily accesible by pulling the stereo, but you still need to feed the wiring under one side of the dash.

Lancsbob
Joined: Fri 15 Aug, 2014 17:35
Posts: 251

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Location: Ormskirk

Re: Ignition controlled accessory.

Post by Lancsbob » Wed 17 May, 2017 15:07

Any idea what colour the live for the stereo is and can you piggy back it?
Its not like the old spade terminals, so much easier to tap in to.

Cheers Bob

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BladeRunner919
Joined: Fri 17 Feb, 2012 20:18
Posts: 2201

  Z3 roadster 1.9

Re: Ignition controlled accessory.

Post by BladeRunner919 » Wed 17 May, 2017 16:03

Not offhand. Do you have the wiring diagrams for the car? If not, you can download one here, which will give you a steer on wiring colours:
http://wedophones.com/Manuals/BMW/

Brian4
Joined: Mon 19 Dec, 2011 19:02
Posts: 533

  Z3 roadster 3.0i
Location: Hinckley

Re: Ignition controlled accessory.

Post by Brian4 » Wed 17 May, 2017 18:33

Lancsbob wrote:Any idea what colour the live for the stereo is and can you piggy back it?
Its not like the old spade terminals, so much easier to tap in to.

Cheers Bob
The ISO wiring harness for aftermarket radios has a spare ignition fed wire which you can use for satnav or cameras.

The Wiring diagram says the ignition feed to the radio is Violet with black stripe. There should also be a spare connector in the lh footwell green with black stripe and a white end which is for accessories. The is fo US cars so may be in the rh footwell for uk cars
Brian
3.0I Topaz Blue

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2000 E36/7 Z3 3.0i
2010 F31 335d
2015 F21 118i

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