features function of the EMIC.
HEADLAMP LEVELING
In certain markets where required, a headlamp leveling system is provided on the vehicle. The headlamp
leveling system includes unique front headlamp units each connected to a headlamp leveling actuator motor,
and a rocker-actuated headlamp leveling switch integral to the switch pod in the instrument panel center stack.
The headlamp leveling system allows the headlamp beams to be adjusted to one of four vertical positions to
compensate for changes in inclination caused by the loading of the vehicle suspension. The leveling motors are
mechanically connected through an integral pushrod to the adjustable headlamp mounting collar.
Each time the headlamp leveling switch is depressed the circuitry of the switch pod provides an electronic
select status up or select status down message input to the EMIC over the LIN data bus. The EMIC then sends
the appropriate electronic select request up or select request down messages to the TIPM over the CAN data
bus. The TIPM responds to these messages by providing a voltage output to the headlamp leveling motors
through high side drivers on the headlamp leveling motor right and left signal circuits to move the headlamp
reflectors to the selected position based upon the voltage input received from the TIPM. The TIPM also sends
the appropriate electronic messages back to the EMIC and the EMIC relays the message back to the switch to
control the illumination of the 1 , 2 , or 3 Light Emitting Diode (LED) selected position indicator in the leveling
switch button. The EMIC and TIPM logic will only allow the headlamp leveling system to operate while the
ignition switch is in the ON position and the exterior lighting is turned ON.
PARK LAMPS
The park lamps system includes the left (lighting) multi-function switch, the SCM, the EMIC and the TIPM.
The front park/turn lamp and the position lamp bulbs each have a path to ground at all times through their
connection to the engine compartment wire harness. The engine compartment wire harness has takeouts with
eyelet terminals that are secured by nuts to ground studs on the front end sheet metal within the engine
compartment. The rear lamp units and license plate lamp bulbs have a path to ground at all times through a
takeout and eyelet terminal of the body wire harness that is secured by a nut to a ground stud on the body sheet
metal within the passenger compartment.
The SCM monitors a hard wired multiplex input from the left multi-function switch, then sends the appropriate
electronic headlamp switch status messages to the EMIC over the LIN data bus. Then the EMIC relays the
appropriate electronic message to the TIPM over the CAN data bus. The TIPM responds to these messages by
providing a battery voltage output to the appropriate lamp bulbs through high side drivers on the proper
park/tail/license/running lamp right and left circuits. The TIPM and the SCM also send the appropriate
electronic messages to the EMIC to control the illumination and lighting level of the panel lamps.
The TIPM provides a battery saver (load shedding) feature for the park lamps, which will turn these lamps OFF
if they are left ON for more than about eight minutes with the ignition switch in the LOCK position. The SCM
and the EMIC each provide a fail-safe feature for the park lamps, which will send an electronic message to the
TIPM to turn these lamps ON automatically if there is no input available from the left multi-function switch.
The TIPM also provides a fail-safe feature for the park lamps that will turn these lamps ON automatically
whenever a loss of CAN bus communication is detected with the ignition switch in the ON position.
REAR FOG LAMPS
2007 Dodge Nitro R/T
2007 ACCESSORIES AND EQUIPMENT Lamps/Lighting - Exterior - Service Information - Nitro