On either style of car (15 or 20 pin outlet) here’s how to do it:
1) Make sure the car is turned off. Uncap the data link.
2) Plug reset tool into pin 7 (see following diagrams.)
3) Attach alligator clip to ground point on the car.
4) NOTE: The ON position of the key is where all the lights and accessories come on but THE ENGINE IS NOT STARTED!!!!!!!!!
5) To reset oil service warning lights (green/yellow/red) turn key to ON position for about 3-5 seconds until the lights go out, then immediately turn off the key again.
6) To reset service interval, turn the key to ON position for 9-12 seconds or until all lights go off, then turn off the key again.
7) Make sure you put away the tool and re-cap the data link. All done!
Right: newer bmw connector types
Above: Our car, ’87 535is
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