On the 20 PIN Connector, What Does PIN 13 Represent?

[cis8vgti]

I just found another mystery wire!

I was going to reset the oil and inspection light indicator. For some reason, the tool would not fit the 20 PIN connector. Under closer examination, PIN 13 has a red/white wire jammed into it. I unplugged the wire and the car started and iidled the same. No start CEL lights.

So what fuction of the car is controlled by PIN 13?

[M Quick]

Just so you know, pin 7 and pin 19 is for reseting the oil service and inspection lights. With ignition on, short pin7 and pin19 with a piece of cable, 3sec for oil service or 12secs for inspection.
You do not need a tool to reset the lights, just a piece of cable :)

However, i do not know what pin 13 is for, all i can say though is that the 20 pin connector is just for diagnostic readings and resets, and nothing for controlling the car really.

[530 i]

You are right, the 20 pin plug is a data link connector and it appears Pin 13 is not occupied.

http://www.carstoreusedcars.com/bmw.htm

[cis8vgti]

Thanks for the replies and link guys. I'm going to double check the PIN tomorrow. I may have the wrong one.

Yes, I did make a mistake. It is PIN #1. According to the link a fellow member posted, it is TD Connector. Why would someone run a separate wire to this PIN?