I wanted to make an adapter from a Nokia car kit to a phone that works
with a 3,5mm stereo jack. I used a broken 6150 phone an wired pins 3
(mic), 4 (gnd) and 5 (speker) to the top, ground and middle pin of the
stereo jack. (See
for Nokia pinout).

This worked, but the car kit always turns the speaker off 5 seconds
after I plugged my adapter into it. Any idea what I can make so that
this doesnt happen?

See More: Car Kit, Pinout and Adapter question