Circuit Description

The Twilight Sentinel (TS) is a BCM feature that will turn on the low beam headlamps and the park lamps and adjust the interior lighting. This is accomplished when the ignition switch is in the ON position and the headlamp automatic control ambient light sensor indicates darkness.

There is a fixed delay of 2 seconds in transitioning from day to night illumination and a fixed delay of 40 seconds transitioning from night to day illumination. In addition, there is an added variable delay which can be adjusted from 10 seconds to 180 seconds (3 minutes).

The twilight sentinel indicator is also controlled by the BCM. B+ is supplied to the twilight sentinel indicator by fuse #15. When the twilight sentinel switch is turned to the ON position, the BCM internally grounds terminal C14 of the BCM connector C2. This provides a ground to turn the twilight sentinel indicator ON.