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Old 12-04-2010   #1
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3901T alarm wiring help? CAN wire location

hi, im gna try and install my 3901T alarm tomorrow, just need to find the wires to splice into, this is the pdf for it:

http://www.bypasskit.com/GetDocument...firmwareid=477

i need to find the can-H, can-L and turn light cables, any help on colours and location? anyone know what the BCM is?
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Old 12-04-2010   #2
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Re: 3901T alarm wiring help? CAN wire location

The CAN H, CAN L and Hazard light wiring colours are all shown on your instruction sheet. They're all present on the Body Computer (Body Computer Module) plug located at the back of the dashboard fusebox.
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Old 12-04-2010   #3
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Re: 3901T alarm wiring help? CAN wire location

many thanks, i take it those wire colours look correct, BCM makes sense, will it be obvious which is the BCM, or is there anything distinctive i should look for?

thanks
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Old 13-04-2010   #4
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Re: 3901T alarm wiring help? CAN wire location

If you tell me which engine and year the car is. I'll try to check the colours are correct.

You need to take the fusebox out and the BC is clipped to the back of it. Ib in the second diagram is the BC. Your instructions say the wires are in the blue connector at the back of the BC.
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Last edited by Davren; 13-04-2010 at 00:20.
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Old 13-04-2010   #5
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Re: 3901T alarm wiring help? CAN wire location

its a 1.8 petrol dynamic (if it makes any difference)
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Old 13-04-2010   #6
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Re: 3901T alarm wiring help? CAN wire location

The wiring colours in your instructions don't match the blue BC connector in the eLEARN wiring diagram. Closest match I can see is:

Black/Pink on pin 24 of black BC connector.
White/Pink on pin 25 of black BC connector.

Blue/Black on pin 34 of white BC connector.

Probably better to get access to the blue connector to see which colour wires go to pins 24, 25 and 35 of it, then I'll check again. Could be your instructions are wrong or the eLEARN wiring diagram could be wrong. (wouldn't be the first time I've discovered errors in eLEARN)
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Old 13-04-2010   #7
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Re: 3901T alarm wiring help? CAN wire location

ok started the install today, and didnt know what to do when i looked at the BCM plugs, in pins 24 and 25 there are no pins there!
so below is a spreadsheet of my pinout.....:



which cables are CAN-H, CAN-L and turn signal???
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Old 13-04-2010   #8
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Re: 3901T alarm wiring help? CAN wire location

Pink/Black is CAN H which would appear to be on pins 33 & 37 of your blue plug.

Pink/White is Can L which would appear to be on pins 32 & 36 of your blue plug.

I don't understand why your instructions say pins 24 or 6 and pins 24 or 5 though.

According to the wiring diagram, Blue/Black wire on pin 34 of the white connector is the connection from the hazard switch to signal the BC to turn on the hazard lights.
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Old 13-04-2010   #9
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Re: 3901T alarm wiring help? CAN wire location

there is no white connector with that many pins, just a small white one with 12 pins....but there is a light blue/black on it....on pin 2.....

i dont understnad the instructions either, thats why im querying it, lol a downside, its obviously been translated incorrectly...

i have e-learn, but i dont know realy how to use it, where should i navigate to and ill have a butchers see if i can make sense seing as tho ive been knee deep in it all for a few hours...?

thanks allot!
could hazards be on pin 20 of the blue BCM ?

i cant even turn them on and probe, because a DMM wont catch the voltage change....
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Old 13-04-2010   #10
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Re: 3901T alarm wiring help? CAN wire location

I can't find any Blue/Black wire on any pin 20 of the BC.

eLEARN wiring diagrams are a nightmare. Select the language, engine size and year, then Electrical Equipment / Electrical Functions, then whatever you want to look at. If you want to look at Exterior Lighting, it's the first of the two Interior Lighting categories. (misprint I suspect). Good luck.
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