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OBC Retrofit
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Procedure courtesy of Damian Bannon
If your BMW E34 came from the factory with either an analogue clock or a digital clock/outside temperature combo it is possible to upgrade to the full On Board Computer (OBC). The clock units use the same connector as the OBC and all the wiring is already in place.
Cars that had only an analogue clock do not have the outside temperature sensor mounted, so this function will not work, but all the other signals come from the ECU.
Cars that have the instrument cluster with no check control will most likely have no gong so the OBC will stay quiet about ice and speed limit warnings and give a visual warning only.
All other functions should work as expected - including the CODE start blocking!
Part numbers:
The first step is to find an OBC unit - These can be got from the stealer (P/N 65 81 8 351 055) but are big $$$ so the best bet is to find a used one from a breaker's yard or similar. An OBC from any BMW E34 model will do - even a BMW E32 OBC will work but as the 7 series has a bigger petrol tank some calculations such as 'range' may be incorrect. Other parts you may want to get are the turn-signal switch which has the OBC remote control on the tip and the new radio/OBC holder. The OBC will work fine without installing the new turn-signal switch and will still blend its notifications into the check control display. The mounting frame (holds together the clock or OBC as well as the radio and heater control module) differs for OBC vs clock equipped cars as the slot for the OBC is deeper than that for the clock, the OBC is approx. double the depth of the clock and the connector is located higher than on the clock. It is possible to cut away the plastic at the back of where the clock sat to allow the OBC fit but the ideal way is to replace the mounting frame. The part numbers for the two frames are:
Holder radio/OBC 65 81 1 384 121
Holder radio/clock 65 81 1 384 141
Note from David:
The e34's have 2 different types of OBC one for the BMW 518i,520i and a different type for the BMW 525i,530i,535i,540i.
I only found this out after I bought an OBC for my 520i and got the famous PPPP error.
After a closer inspection and after reading on another site, the 520i coding plug cant communicate with the standard OBC therfore a different obc is required for the 520i with another coding plug built into the back of the OBC itself.
Procedure
Second step is to remove your old clock - To do this, remove the radio and the radio's mounting case and then reach inside the vacant radio slot at the side next to the clock, at the top you should feel a little lever (position marked by red dot on remove_clock.jpg) which you need to press (push it towards the engine) and the mechanism should make the clock move out towards you and you can then pull it out the rest of the way with your fingers.
The third step is to try the OBC to see if it works - The connector is clipped into the back of the mounting frame, unclip this and pull it out a bit (there should be an inch or two give in the wiring) and then plug it into the back of the OBC. Turn the ignition on and see if the OBC comes to life.
Clock removed
If the OBC doesn't come up the next step is to figure out why. The list of connections is given in the table below so start by checking that there is +12v at pins 6, 8, 9 & 17. The most likely culprit is pin 17 as there will be no power to this if your car doesn't have the auxiliary horn relay installed and without power at pin 17 the OBC will play completely dead. If there is no power at pin 17 an easy solution is to cut the red-grey-yellow wire that goes to pin 17, cut it as far from the connector as possible to make life easier, and join this to the red-yellow (red with a yellow stripe, there's also a yellow wire with a red stripe!) wire that provides power to pin 9. You could join these via a 5 or 10 amp fuse if you prefer and it may be no harm to tape off the end of the red-grey-yellow wire coming from the car so it can't cause any problems.
Digital clock/temperature indicator
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pin4: ground
pin5: blue/red/yellow, temp sensor
pin8: + from fuse F1
pin9: + from fuse F20
pin18: white/blue, chimes
pin19: white/red, chimes
pin22: grey/red, light switch
OBC
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pin1: violet/green/yellow, alarm system
pin10: black/green, starter
pin6: + from fuse F17
pin9: + from fuse F20 (red/yellow)
pin8: + from fuse F1
pin22: grey/red, light switch
pin25: yellow/red, turn signal switch
pin3: white/yellow, diagnostics
pin16: white/violet, diagnostics
pin14: white/grey, instrument cluster
pin7: black/white, instrument cluster
pin4: ground
pin5: blue/red/yellow, temp sensor
pin20: black/red/yellow, pre-ventilation
pin21: black/white, pre-ventilation
pin23: violet/white/yellow, alarm system
pin17: red/grey/yellow, alarm system
pin26: black/red/yellow, fuel tank level sensor
pin12: brown/violet, fuel tank level sensor
pin11: white/black, DME
pin24: black/violet, DME
pin19: white/red, chimes
pin18: white/blue, chimes
pin15: white/brown, radio
pin2: blue/brown/yellow, radio
Once the OBC is working, the next step is make it fit properly - You can either replace the mounting frame with the one designed to hold the OBC or alternatively you can cut away the plastic at the back of the original mounting frame (This can even be done without removing the mounting frame if you are careful by using a suitable saw from the front) so that the OBC will slide in all the way until the front of it is flush with the console.
Next, you need to set the country setting for language, miles/km, C/F and l/100Km / Km/l. - To do this you need to access the OBC test menu by simultaneously pressing the 1000 and 10 keys so that the display changes to "TEST". With the 10 & 1 keys enter 11 on the display and then press the S/R button. "0 LAND" should now be on the display and you can alter this by using the 1000 & 100 keys and the S/R to save. The settings are from "0 LAND" to "9 LAND" and through trial and error you should be able to find the setting that is best for you. Also, some settings use US gallons while others use European gallons so take that into account.
If the OBC appears to be reporting inaccurate fuel consumption figures it can be calibrated to give the correct values. - Fill the fuel tank to the maximum and reset the trip counter and one of the OBC's average fuel consumption monitors. Run the fuel tank nearly empty and fill the fuel tank again to the maximum. The amount of fuel it now takes to fill the tank is the amount used to cover the distance recorded on the trip meter so, from this, work out the actual fuel consumption of the car and then compare this to what the OBC reported as the average fuel consumption. If these two average fuel consumption figures are not exactly the same then you need to calibrate the OBC by entering a new correction factor.
The fuel consumption correction factor is a locked function of the OBC so before you can access it, you must first unlock the OBC - Access the OBC test menu by simultaneously pressing the 1000 and 10 keys so that the display changes to "TEST". With the 10 & 1 keys enter 19 on the display and then press the S/R button. Add the current day and month (as it is known to the OBC) and enter this value and then press the S/R button, the OBC should now be unlocked. To access the fuel consumption calibration factor you once more need to simultaneously press the 1000 and 10 keys so that the display changes to "TEST". With the 10 & 1 keys enter 20 (Be careful not to enter 21 as this will reset the OBC) on the display and then press the S/R button - you should now see something like 1000 CORR, this is your current correction factor. To calculate your new correction factor use the following:
new_correction_factor = old_correction_factor * actual_mpg / obc_mpg
Enter your new correction factor into the OBC using the 1000/100/10/1 keys and then press the S/R button. If you want to relock the OBC - enter function 19 again then press the C/F button to lock.
Much of the information contained above came from internet posts by: Priit Varik, Mark M and Al and from http://home.iae.nl/users/bts/obc.htm
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Click on the thumbnails to see larger images.
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BMW, 3 - Series (E36) 1991-99
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... to be very high off of the ground (oil change) use ramps. If you are doing work that requires the front of the car to be high off the ground (shift lever install) use both. If the front is lifted pretty high the tires probably won't touch the ramps, but it's still nice to have them there if you're going to be under your car. Place the ramps under the front tires and/or the jackstands underneath ...
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... The car's first traction problem comes from the differential. The differential is a gear unit that couples the rear wheels to the single driveshaft coming from the transmission. It has to transmit power from the transmission, while allowing the rear wheels to spin at different speeds. The wheels need to turn at different speeds because when the car goes around a corner, the outside ...
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5 November 2004
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Author : |
Brian Brown
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Winter Storage
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Model : |
BMW, 5 - Series (E34) 1989-96
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Misc
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... grease to rubber weather-strips all around. 4. Cedar board might help to prevent insects. 5. Close all vents. Battery: 1. Remove the battery and store it in a warm place. 2. Set it on a piece of wood (to avoid power drainage), away from open flame, sparks or... children. Tires: 1. You might want to remove the tires to remove the weight of the car. 2. Place all four corners of your E34 on ...
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Posted : |
10 December 2004
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bmwe34.net
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Track Preparation
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Model : |
BMW, 5 - Series (E34) 1989-96
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Misc
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... Prepare the car: Outside - Mechanic • Rain-X your windshield if it looks like rain. • Bring your car to a reputable garage to have it checked thoroughly. Some driving schools give you a form to have filled out from your favorite mechanic. • Torque all the wheels at the same value (around 80ft/lb). • Check your tire pressure and bring a good tire gauge and a compressor if you have one. Inflate ...
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10 December 2004
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Dragos
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Winter Driving
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BMW, 5 - Series (E34) 1989-96
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... in your car. 8. Keep some none perishable food and bottled water. Exterior: 1. Thoroughly clean and wax the E34 (some people recommend using an acrylic sealant instead of wax for extreme winter condition). 2. Lubricate doors, hood and trunk latches. 3. Check the undercarriage and apply rubber, or asphalt undercoating, in damaged areas. 4. Spray the alloy wheels with silicone spray to protect ...
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