Patriot 2WD L4-2.0L (2008)
Daytime Running Lamp: Description and Operation
DAYTIME RUNNING LAMPS
Vehicles equipped with the Daytime Running Lamps (DRL) feature enabled illuminate the high beam filament (except Patriot with Trail-Rated option
for the United States market, which uses the low beam filament) of both headlamp bulbs at a reduced intensity when the engine is running, the parking
brake is released, the headlamps are turned OFF, and the optional automatic transmission gear selector lever is in any position except PARK. The park
lamps may be ON or OFF for DRL to operate. For vehicles with a manual transmission, the DRL will operate in any transmission gear selector lever
position. The TIPM must be programmed appropriately for this feature to be enabled.
Once enabled, anytime the TIPM receives electronic messages over the CAN data bus from the Powertrain Control Module (PCM) indicating the engine
is running, from the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) indicating the status of the left
(lighting) multi-function switch is in any position except headlamps ON and the parking brake lever is released, and from the Transmission Control
Module (TCM) indicating the automatic transmission gear selector lever is in any position except PARK, the TIPM provides a pulse width modulated
voltage output to the headlamp high beam bulb filaments through high side drivers on the right and left high beam feed circuits to produce illumination at
a reduced intensity. See: Power and Ground Distribution/Power Distribution Module/Locations
