E 450 V8-6.0L DSL Turbo VIN P (2004)
Cruise Control Indicator Lamp: Description and Operation
SPEED CONTROL INDICATOR (F-SUPERDUTY/EXCURSION)
Speed Control Indicator (F-SuperDuty/Excursion)
The speed control indicator is controlled by the instrument cluster. The PCM sends a message through the SCP network to the instrument cluster to
illuminate the indicator when the speed control is engaged.