which pins need to be shorted to turn off service light on a volvo 850 1994?

Hi Matt, this is the method:-
switch ignition on,
connect the fly lead on diagnostic socket to pin 7
press the button 4 times
system is ready when LED comes on
to reset code 1-5-1
press button once
when LED illuminates press button 5 times
when LED illuminates press button once
LED should flash repeatedly to indicate code accepted
service light should now be out!
button LED
7, 3,
6, 2,
5, 1,

nigel
March 2008