Updates info. The
2002 instrument cluster has incandescent bulbs. A common type. The sealed
part is where all the key security is. I have a friend that has pulled the instrument panel out and Ford lists bulb
part numbers. So, when Ford says not serviceable, it does not include incandescent bulb replacement.
I will edit when I find the
part numbers.
Looks like the PWM signal is sent to LEDs and incandescent bulbs. So LED replacements might work.
The instrument panel dimmer switch allows the brightness level of backlights and displays to be adjusted dependent upon the headlamp switch position and the instrument panel dimmer switch position. The instrument panel dimmer switch sends a signal to the
instrument cluster which then sends a backlighting intensity and dimming curve command over the standard corporate protocol (SCP) link to the
front electronic module (
FEM), the audio unit, and the dual automatic temperature control (
DATC) module. The
FEM then sends a pulse width modulated (PWM) dimming signal to the
instrument cluster, the dimmable LEDs, and the dimmable incandescents.