OBC2 installation - BMW M5 Forum and M6 Forums

Go Back   BMW M5 Forum and M6 Forums > BMW M5, M5 Touring, M6 and Z8 Forums > E28 M5 Discussion

E28 M5 Discussion 1984-1988


Reply
 
LinkBack Thread Tools Rate Thread Display Modes
Old 16th April 2010, 16:39   #1
raymondw
Moderator
 
raymondw's Avatar
 
Join Date: Mar 2000
Location: NL
Age: 42

Garage: 1990 BMW E34 ///M5 (181), 1985 BMW E28 ///M5 (203), 1988 BMW E32 735i (198), 2003 BMW E39 530i touring (354)

Sales Feedback: (0)

Thanks: 394
Thanked 623 Times in 354 Posts
OBC2 installation

On Friday the 9th of April, I traveled to the North-west of Friesland to pick up an OBC2 for my E28 M5. There has been some debate about whether or not an E28 M5 has the OBC2 fitted as standard, but a fact is that #231 does not have any. Also the wiring loom was not present and has not been messed-up with. The entire wiring of #231 underneath the dashboard is original. As individual OEM parts, the OBC2 is hideously expensive, but from time to time, complete sets are offered on the bay of e for reasonable money. I did not source my set on the bay of e, but directly from fellow E28 enthusiast Ivo who has a nice parts-bin of E28 parts lying around.

The OBC2 set consists of (see picture below):

1: The OBC2 unit with the coding plug.
2: The outside temperature sensor.
3: A relay box for the alarm horn (PIN code protection)
4: Primary wiring loom.
5: Secondary wiring loom for relay box and option-box
6: The alarm horn
7: Turn signal switch with OBC dim-dip control
8: Gong speaker





Removal of parts

To install the OBC2, the instrument cluster and the existing digital clock from the dashboard have to be removed. When that is done, the knee-cover, steering wheel and the bottom-part of the steering column cover have to be removed. When that is done, the driverís side looks as follows.



For cars that have the DWA alarm, the relay control box and the secondary wiring loom are not needed. The DWA alarm does have a feature connector for interfacing to the OBC2. The code function does require this connection to activate the alarm horn if the car is being tampered with.



The control-module for the DWA module is located under the knee-cover on the driverís side (LHD model). Even though it is not required to remove the DWA box, it limits the available working space.



The dim-dip function of the turn-signal switch allows to a sequential selection of the OBC functions. The dim-dip function is not included on non-OBC2 cars and thus has to be replaced unless one wants to push the buttons on the OBC itself.



The installation of the primary wiring loom is rather straightforward and will be integrated in the existing wiring bunch. The green multi-pin connector is for the OBC2 unit; the yellow multi-pin connector for the instrument cluster and the rest of the connector is routed towards the driverís footwall.

The turn signal switch has a relay integrated in its wiring loom. However, the relay-socket of the OBC2 set did not fit the steering column of #231 so I decided to exchange the wiring looms. Although rather straightforward, the pin-layout of the turn signal switch for the OBC2 variant is different then the part without the dim-dip switch, hence why one has to be careful not in interchange the wiring without noting the connections first.



Although I have a degree in engineering and exchanging wiring looms and the required soldering should be a piece of cake, the primary functions (turn lights, emergency lights and high beam) were tested prior to final installation. The dim-dip switch is tested in combination with the OBC2 unit that should be connected in this stage.

Please note that the coding plug for the OBC2 is E28 M5 specific. Coding plugs for the German version are still being stocked in Munich and are reasonably priced but take a few days to deliver. After testing the OBC2 controls and connection of the gong-speaker, the DWA alarm control box and the routing of the wiring for the ambient temperature sender, the steering column cover and the steering wheel were placed back.



In the mean time, the correct coding plug has arrived and was picked up this morning. When I have replaced that part, I can test the temperature function for which I still have to install and connect its sensor.
__________________
Raymond

==> MY90 E34 M5 3.6 <==
==> MY85 E28 M5 M88/3 <==

The E34 M5 Alps tour. Sixth edition: 14-17 September 2007
raymondw is offline   Reply With Quote
The Following 3 Users Say Thank You to raymondw For This Useful Post:
corneredge (19th April 2010), Mfiver (20th April 2010), mottati (17th April 2010)
Old 17th April 2010, 19:39   #2
mottati
Moderator
 
mottati's Avatar
 
Join Date: Oct 2002
Location: sf east bay ca.

Garage: 93 M5 3.8 Sterling Silber 94 M5T Madeiraschwarz

Sales Feedback: (2)

Blog Entries: 1
Thanks: 171
Thanked 325 Times in 258 Posts
I always enjoy your threads Raymond!
__________________
Mike

93 M5 3.8 Sterling Silver, Black 5/93 production (euro)

94 M5 Touring Madeira Schwarz, Black 10/93 production

90 325iS, Black/Natur 5 speed, totally stock for now

93 Range Rover County LWB, Roman Bronze

09 335d Japanrot/Black, No I drive, Sport, H&R/Koni, Logic 7

91 M5 Alpine White II, Silver Gray 3/90 production (sold)

00 M5 Silver, imola red/black sportive 6/00 production (sold)
me---> www.diablovalleyeyes.com
mottati is online now   Reply With Quote
The Following User Says Thank You to mottati For This Useful Post:
raymondw (17th April 2010)
Old 17th April 2010, 19:49   #3
Stoffie
Member, Sport: On DSC: On (>100 posts)
 
Join Date: Aug 2009
Location: Belgium

Garage: BMW M635CSi Schwarz

Sales Feedback: (0)

Thanks: 1
Thanked 21 Times in 21 Posts
Nice job Raymond!

Did you also replace the SI board while you had the cluster out ?

I replaced mine today with the ProgRama board, and also replaced all the light bulbs while I was at it. Worked like a charm, first time! No more annoying orange/red lights and the inspection light being lit.
Old board was already the one with the lithium Sanyo's, so must have been replaced at least once before.
Stoffie is online now   Reply With Quote
Old 17th April 2010, 22:12   #4
raymondw
Moderator
 
raymondw's Avatar
 
Join Date: Mar 2000
Location: NL
Age: 42

Garage: 1990 BMW E34 ///M5 (181), 1985 BMW E28 ///M5 (203), 1988 BMW E32 735i (198), 2003 BMW E39 530i touring (354)

Sales Feedback: (0)

Thanks: 394
Thanked 623 Times in 354 Posts
Quote:
Originally Posted by Stoffie View Post
Did you also replace the SI board while you had the cluster out ?
No, I repaired my own SI-board some time ago with a work around for the temperature sender, pending the arrival of the Programa board.

Quote:
Originally Posted by Stoffie View Post
I replaced mine today with the ProgRama board, and also replaced all the light bulbs while I was at it. Worked like a charm, first time! No more annoying orange/red lights and the inspection light being lit.
I placed an order a batteryless SI-board at Programa board some time ago. They were quick with their quotation, which I accepted. I did ask for a pro-forma invoice before giving them my credit card details, however I never received an order-confirmation and communication was at a halt. Long story short, I still do not have the Programa SI-board.

With the work-around for the temp-gauge and no other defects, I do not have an imminent need the Programa SI-board, so if they don't like to ship products to the EU; so be it.
raymondw is offline   Reply With Quote
Old 17th April 2010, 22:23   #5
Stoffie
Member, Sport: On DSC: On (>100 posts)
 
Join Date: Aug 2009
Location: Belgium

Garage: BMW M635CSi Schwarz

Sales Feedback: (0)

Thanks: 1
Thanked 21 Times in 21 Posts
I see. Well all I can say is that it was plug and play (the misery of extracting the whole cluster notwithstanding) and it works great, even if it did not come directly from ProgRama.

Here is another one, from the same seller I got mine from. Was in a sealed ProgRama antistatic bag and packed very well.
Stoffie is online now   Reply With Quote
Reply

Bookmarks



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
exhaust installation SWANK55 E63 BMW M6 Forum and BMW M6 Convertible | m6board.com 3 21st November 2008 06:08
V-max installation... rich E34 M5 Discussion 0 3rd October 2003 13:55
help on installation of exhaust!! Ruffinit M5 E39 and E60 tips & tricks 4 6th May 2003 04:28
V1 Installation GGG E39 M5 and E52 Z8 Discussion 12 26th August 2002 01:53
V1 installation 1C00lVC M5 E39 and E60 tips & tricks 0 15th July 2001 01:31

Loading...

All times are GMT +2. The time now is 08:00.



Everything Copyright 2000-2008. Do not use ANYTHING from this site without written permission. All images, graphics, sound files, video files and text appearing on this web site are the exclusive property of m5board.com and are protected under international copyright laws. All images, graphics, sound files, video files and text on this site are for on-screen and on-site viewing and listening only. No part of this web site may be reproduced, copied, saved, stored, manipulated, or used in any form for personal or commercial purposes without the prior written permission of m5board.com. Use of any image or graphic as the basis for another photographic concept or illustration is a violation of the copyright. Any copyright infringement will be prosecuted to the full extent of federal and international copyright laws. M5board.com is an enthusiast board and we don't condone any dangerous activity. Our airfield events are completely safe based on years of experience, we conduct them during clear visibility with mature participants that have several years of experience with high-performance automobiles, large unobstructed run-off zones on sealed off private former military airbases and we clearly mark the braking zones. If inexperienced with high speed driving we do not recommend organizing your own event but attending a high-performance driving school. The use of the term "BMW" on this site is for reference only, and does not imply any connection between m5board.com and BMW AG or BMW North America.