Entering Diagnostics
WARNING: This page is about a different car, the 1989 Cadillac Allante. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Operating vehicle in "Service Mode" for extended time periods, without engine running, will cause battery to run down and possibly relate false diagnostic information.
To enter diagnostic mode, turn ignition to ON position. Press "OFF" and "WARMER" buttons on the Climate control panel simultaneously, and hold until a segment check is displayed on IPC and COMBO panel. See Fig 1 -Fig 5 .