BMW 5-Serie: Taal instellen bc E34

The following is for newer OBC found in E36 cars for example:

To determine if your OBC is eligible .. press 1000 and 10 together.
you should see TEST NO . -- or something like that.
Now, some of the functions are locked out -- I do NOT recommend messing with them and you do so at your own risk -- that said ...

To unlock all functions .. press 1000 and 10 and at the TEST prompt enter 19 using the keys .. press SET/RES .. you should see
LOCK:ON or something similar ... press the DATE key .. (today you'd see 08.20) and add the two numbers (day and month) together
(today 28)

Now enter the number you just calculated (28) and press SET/RES. TADA .. you have unlocked the secret functions ...

To lock them back up .. press 1000 and 10 then enter 19, SET/RES now press SET/RES again .. it should show .. LOCK:ON again

In general when I show a test enter it by pressing 1000 and 10 together then enter the number of the test with the numeric keys and press
SET/RES to actually execute the test ...

Test numbers for E36 OBC (Note: Joe this should also work for your 535!)
Test no.
Description

1 Display Test .. all LCDs and LEDs activate

2 Current Consumption in l/100km

3 Current Consumption in l/hour

4 Average Consumption (used to calc. Range)

5 Current Range

6 Not used ..

7 Average Fuel in Tank (l)

8 Current Speed (km/h)

9 System Voltage at terminal R

10 Country/Language

11 Units/ AM.PM

12 Average Speed (km/h) for calc.

13 ETA

14 Date of software/mask of OBC

15 Production Diagnosis (??)

16 Production Diagnosis (??)

17 Display Vehicle Specific Data

18 Alarm Changeover (continuous v. intermittent)

19 LOCK/UNLOCK all functions

20 Correction Factor for OBC Fuel Consumption (SEE BELOW!)

21 Reset all defect codes, date and time ... activate by pressing SET/RES


Note on test #20:
The factor is used to correct the OBC Avg Fuel Consumption figure to reality. If your OBC is off a bit: fill UP totally,
run tank down and refill; then calculate your Actual MPG. Now enter test 20 to get the old Correction Factor.
NEW CF= OLD CF *(OBC MPG/Actual MPG)
Enter the NEW CF using the numeric keys and hit SET/RES to store. PLEASE record your OLD CF so that IF you
screw up you can always go back to what it was.


Updates:
This is from a European 1990 M5 owner (9/3/96):

I have also found a deviation from the FAQ (which describes an E36 OBC) in the 'lock/unlock secret functions' of the E34 OBC:
To unlock:

Press the DATE key, and add the day + month numbers
Press 1000 and 10 simultaneoulsy, then use 10 and 1 keys to enter test 19
Press S/R once. You will now see 0000LOCK or similar
Use the 10 and 1 keys to enter the sum of day + month
Press S/R -- secret functions are unlocked...
Verify by entering test 19 again. Display should show FREE

To lock:

Press 1000 and 10 simultaneoulsy, then use 10 and 1 keys to enter test 19
Press S/R once. You will now see FREE or similar
Press the little square button (F/C) to the left of display
Verify by entering test 19 again. Display should be 0000LOCK.

The procedure to show the version number also differs from the FAQ. On the E34 OBC, you need to press the 100 and 1 buttons
simultaneously, to display the type/version (Mine shows '5-00TYP').