Connected a light pen from to neg cable to neg post to observe when light would go out when fuses were taken out.
Discovered the removal of 9 would make the light go out, but ..
only when
C and 9 we both out at the same time.
If 9 was taken out, but C was left in, the light would stay on.
9 controls the diagnostic module, among many other functions.
(Started with
http://www.peachparts.com/shopforum/tech-help/366497-check-engine-light-after-key-out.html)
Noticed the transmission selector lever position light is not working - controlled by 9 also!
What does this mean and what should I do next?