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From digest.v6.n576 Thu May 1 14:21:52 1997
From: Christopher Pawlowicz <chrisp_at_doe.carleton.ca>
Date: Thu, 24 Apr 1997 08:50:36 -0400
Subject: <E30> re: obc retrofit
Scott Miller asks
>I had the OBC in my 1988 535i and my 1987 325is. My current car, a 1990
>325i, only has the clock and external temp. readouts. If I buy an OBC
>from my local friendly salvage yard, can I just plug it into existing
>wiring in my car, or do I need a wiring harness and more goodies?
you *can* do it but you need a few parts.. here is what I've grabbed from
the digest:
>OBC parts consist of display unit, harness, relay box (black plastic about
>1.5" x 4" x 6" mounted near ABS ECU), turn signal switch, and horn. The
>donor vehicle had most of the front end removed so I couldn't find the horn.
>This horn is supposed to sound for 30 seconds after three attempts to start
>the car without entering the correct code.
>I believe it is mounted on the drivers side below the
>bumper and inside the valance panel. The turn signal switch is needed if you
>want to retain the feature that allows you to cycle through the OBC displays
>by pressing the end of the turn signal switch. The relay box is essential. It
>disables the main relay or the fuel pump relay, depending on year and model,
>
>There are somethings to watch out for. You must have the correct coding
>plug for your model of car otherwise the mpg/range/speed functions will
>give you incorrect readings. Try and get an obc from the same model of car
>but if you can't don't worry, you can always fork out for the coding plug
>(sorry, don't know the cost here in US). The installation is a breeze.
>Just swap out the units and put in the new cable. If you don't want the
>code function or the stalk control then that's it!
>
>
> 3 M M 3 3 3 3 3
> 1 4 3 2 2 2 2 2
> 8 2 5 5 5 5 5
> E E i i
>Item Description S X Symbol From To Part #
>------------------------------------------------------------------------------
> 1 Input unit 1 1 1 1 1 1 12/83 65 81 1 386 867
> 1 Input unit 1 1 1 1 1 1 CDN 12/83 65 81 1 386 868
> 2 Coding Plug 1 1 1 12/83 09/86 65 81 1 373 686
> 2 Coding Plug 1 1 1 09/86 09/87 65 81 1 381 795
> 2 Coding Plug 1 09/87 65 81 1 381 793
> 2 Coding Plug 1 1 1 08/87 65 81 1 385 941
> 2 Coding Plug 1 09/87 65 81 1 381 792
> 2 Coding Plug 1 09/87 65 81 1 380 891
> NEXT ENTRY APPLIES ONLY TO ADDITIONAL FUEL TANK
> 2 Coding Plug 1 1 1 65 81 1 381 320
> 3 Bulb 2 2 2 2 2 2 62 11 1 368 299
> 4 Housing 1 1 1 1 1 1 65 81 1 375 461
> 5 Cover 1 1 1 1 1 1 65 81 1 374 938
> 6 Screw 4 4 4 4 4 4 07 11 9 907 605
> 7 Relay 1 1 1 1 1 1 65 81 1 373 726
- Deleted 32 quoted line(s) ------
info thanks to Paul Marshall scotsman_at_msp.sc.ti.com and others on the digest
hope this helps
chris pawlowicz
'89 325i
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