Interior Lamps Dimming

PANEL DIMMING
Voltage is applied at all times through the RH Rear Power Distribution Center Fuse Block #1 PARK LAMP Fuse to the Lamp Control Module (LCM). With the headlamps or park lamps on, voltage is applied through the LCM, CKT 9 (BRN), I/P Fuse Block INT LP Fuse and CKT 32 (YEL) to the panel dimming control and the dimmer module(s). The panel dimming control applies a variable control voltage to the dimmer module(s). The potentiometer in the panel dimming control cannot provide enough current to operate the panel lamps. The dimmer module(s) amplifies the current and applies a variable voltage to the panel lamps. As the amount of current increases, the lamps become brighter. As the amount of current decreases, the lamps become dimmer.

PARADE DIMMING
The parade dimming feature prevents the dimming of the VF displays when daylight is sensed by the LCM and the park lamps are turned on manually. If the LCM senses that it is dark outside and the park lamps are on, it will allow the VF displays to be dimmed.

All modules with VF displays receive the dimming level from an input on CKT S (GRY) or CKT 1244 (BRN). When the LCM determines that the above conditions have been met, it sends a signal to the Instrument Panel Cluster (IPC) and the radio via CKT 390 (YEL).