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  #1  
Old 16-08-2016, 08:20 PM
Charlieboy Charlieboy is offline
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Default Bmw n54 12v pre-crank help

Having some trouble with getting power to the gauge before cranking the engine. I've wired exactly as it says in the drawing for my engine but I have noticed it say 2008 on the drawing onwards and my car is a 2007.
The gauge powers up if I crank the engine but it's not what the quick start says to do.
Am I meant to wire the pre-crank power to a different wire on my car?
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Old 17-08-2016, 08:20 AM
Richard L Richard L is offline
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Default Re: Bmw n54 12v pre-crank help

I will look into this.
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Old 17-08-2016, 07:09 PM
Charlieboy Charlieboy is offline
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Default Re: Bmw n54 12v pre-crank help

Thanks Richard. Would it be possible to wire the 2 wires to something in the fuel box instead that runs the same kind of power?
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Old 18-08-2016, 07:37 AM
Richard L Richard L is offline
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Default Re: Bmw n54 12v pre-crank help

Yes, you can. I will find it for you.
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Old 31-08-2016, 10:45 AM
Richard L Richard L is offline
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Default Re: Bmw n54 12v pre-crank help

I cannot see any difference between the 07 and 08 model, regarding wiring.

The two red wires should be powered up at the same time as the ECU (DME). I cannot see any problem with that. The test procedure on user manual may duffer from car to car. Following the wiring diagram. You need to have the green harness connected.
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Old 15-09-2016, 07:27 PM
Charlieboy Charlieboy is offline
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Default Re: Bmw n54 12v pre-crank help

Hi Richard, finally had a bit of time today to see if I can get power to the unit before starting the engine and unfortunately 3 hours later I got no where with it.
I tried jacking into a few of the fuses but the unit won't power up on pre crack. It only powers up when the engine is started. Is it essential that the unit powers up first before the engine?

These are the steps when I start the car.

1 key card goes in and the dash light up
2 press the start button without touching the break pedal and rest of the electrics start.
3 press the start button with the break pedal down then engine starts.

I do have comfort access on my car if that makes any difference.

I managed to find a fuse that turns it on when the key isn't even in and stay on but as soon as you put the key in it turns off and won't turn back on until the engine has started.
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Old 15-09-2016, 09:01 PM
Richard L Richard L is offline
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Default Re: Bmw n54 12v pre-crank help

The thin red wire from the grey harness controls the aquamist's power up sequence. I really don't have an answer for you. I believe on of the wire on the DME response to keyless entry signal. Not too comfortable with that over night if a child walks near the car with a key.

Let me look into this a but further. Can you track down the 12V supply to the LP fuel pump?
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Old 15-09-2016, 09:55 PM
Charlieboy Charlieboy is offline
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Default Re: Bmw n54 12v pre-crank help

Yeah I should be able to hook it up to the lpfp 12v power supply no worries. I'll give that go and let you know how it goes.
Cheers Richard
If all else fails do you any company's that could finish off my install in the south East/ Hampshire?
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Old 15-09-2016, 10:27 PM
Richard L Richard L is offline
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Default Re: Bmw n54 12v pre-crank help

I would do it yourself, always end up with a better job.

It will be easier to tap it at the fuse box. I see if I have just info on file.
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Old 15-09-2016, 10:31 PM
Richard L Richard L is offline
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Default Re: Bmw n54 12v pre-crank help

Try FUSE 02.
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