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Undocumented feature discovered - - - (archive)

[ Follow Ups ] [ 8-series (E31) Message Board ] [ Msg. Board FAQ ]

Posted by Derek P on April 01, 2001 at 01:29:56:

We all know the 8 Series has a number of undocumented features including the 'Unlock' code for the OBC and the 'Cycle all Instrument Gauges' procedure. I had occasion to speak with an older retired BMW tech yesterday and he was going on about some of the 'hidden' features that he felt BMW should have documented in the Owners Manual. He mentioned the two above and he seemed a bit surprised to learn that most members of the E31 board already knew how to unlock the OBC and run the instrument cycle test.

He then asked me if I'd ever had a serious collision in my 8 - thankfully I was able to tell him that my machine had never been involved in an accident. He sort of grinned and asked if I was confident that the 'serious crash ' response system would work if it was ever needed. I guess I looked a bit blank so he asked me if I had my Owners Manual on board. I did and we looked at page 26 where it states that in the event of a serious crash the Central Locking System would unlock all the doors, the Hazard Warning Flashers would activate and all the Interior Lights would come on. Well, I now know there is a procedure to test this system.

To run the DFA Test (he said it was Destrukt 'something' Alles - didn't understand exactly) :

1. the key must be in the accessory (#2) position
2. while sitting in the car lock all doors using the central locking button
3. be sure all interior lights are off
4. the transmission (auto or manual) must be any gear OTHER than neutral, reverse or park
5. now depress the brake pedal 5 times (quickly and firmly)
6. immediately push in the turn signal stalk
7. all the interior lights should come on, the hazard warning flashers should activate and the doors should unlock.
8. the OBC readout should display "DFA - - A" (DFA Active??)

Anyway, it works on my Canadian spec '93 850Ci - just one more hidden feature on our (very) complex machines.

Derek
'93 850Ci - L/G



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