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BMW engine service light

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BMW

Reseting the light without tool

grounding pin seven (7) of the diagnostic connector would reset the service lights. I found that grounding pin seven (7) for ~3 seconds applied to an oil service reset and that ~9 seconds applied to the inspection service reset.

Make a wire jumper tool using a solid copper Mueler alligator clip and banana plug (male pin) that would accommodate the diagnostic female pin.

Rather then short the two pins within the diagnostic connector, you attach the alligator clip to engine ground and connect the male pin to diagnostic pin seven (7) (less chance for error). It also embedded a 470 ohm resistor in series within the banana plug.

This limited the current to ~25 ma. in case you went to the wrong pin. As a side note, the reset on an F 100 jet engine diagnostic unit is defined as 50 ohms or less to ground for a specified time.

It's work also from 1984 300/500 series

The following is used to make one for 1996 328is and '97 318tis which both have the 20 pin data link connector. I've also included the part # for the pin that fits the 15 pin diagnostic connector.

Use any of the following at your own risk. As always, feel free to do it your way.

Construct the jumper tool as shown in the above photo using the appropriate BMW pin for the 15 or 20 pin connector.

Epoxie the ridge of the pin to the banana plug.

Also place a drop of epoxy at the other end of the banana plug.

Reset Instructions:

(For cars with the 15 pin diagnostic connector)

With the ignition switch at (position two) and the engine not running, grounding pin seven (7) of the diagnostic connector for approximately three (3) seconds will reset the oil service lights. Grounding pin seven (7) for approximately twelve (12) seconds will do an inspection service reset.

Connect the clip end of the jumper tool to a good ground in the area of the diagnostic connector. Connect the pin end of the jumper tool to pin seven (7) of the diagnostic connector. Enter the car and turn the ignition switch to position two (2). This way you can watch the lights reset.

Turn off the ignition switch when you see the lights reset after the appropriate time. This time as mentioned above depends on whether you are doing an oil or inspection service reset.

Remove the jumper and replace the diagnostic connector cap.

(For cars with the 20 pin data link connector)

On the newer cars you also have to place the ignition switch in position two. You provide a short and then remove it after a specified time. The reset occurs on removal. On the older cars the reset occurred after the specified time. That's the difference between the older diagnostic connector and the newer data link connector. I purchased a Peake reset tool to find out what these times were. They say to provide the short for 7 flashes for an oil service reset and 23 flashes for an inspection reset. The 7 flashes for the oil service reset equates to ~ 3.25 seconds. The 23 flashes for the inspection reset equates to ~ 11 seconds.

Turn the ignition switch to position two (2). Connect the clip end of the jumper tool to a good ground in the area of the data link connector. Connect the pin end of the jumper tool to pin seven (7) of the data link connector and remove it after the appropriate time, depending on which reset you are doing. Replace the data link connector cap and turn off the ignition switch. Check to see if the reset worked by starting the car and seeing if the lights go out.

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