I used to reset the oil service lights on my 94 530 with a homemade switch by shorting two pins in the diagnostic connector. I made this switch from instructions I found somewhere on the internet and used it for 10 years. I sold the car a few years ago and recently bought an 89 535. I want to reset the oil service light but can't remember which pins to short. Is anyone familiar with this and can point me to the reference. I search these forums and BAV Auto without success.