Note On Intermittents

When IPC II82 input change-of-state indicator displays an "X", check circuit an intermittent open. Cycle twilight control between OFF and MAX delay. If BCM parameter BD43 does not read 6-94 percent, replace left switch assembly.

Fig 1: BCM Code B121, Schematic, Twilight Enable Switch

Fig 2: Flow Chart, BCM Code B121, Twilight Enable Switch