Ignition Key Switch
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1998 Acura Integra, 1998 Acura 3.2TL, 1998 Acura 3.0CL, 1998 Acura 2.5TL, and 1998 Acura 2.3CL. However, it is still accessible from the selected car via links, so may be relevant.
When ignition key is left in the ignition switch, key-in beeper in the ICU receives ground through the ignition key switch. When driver's door is opened, the key-in beeper in the ICU is grounded through the door switch, and the beeper sounds.