Dodge Nitro. Manual — part 647

integral screw-drive transmission. The ball on the end of the pushrod is snapped into a socket on the back of the
reflector within the front lamp unit housing, which will cause the reflector to move as the pushrod is extended
or retracted, changing the angle at which the light is projected from the headlamp low beam bulb filaments.

The hard wired circuits for the headlamp leveling motors may be diagnosed using conventional diagnostic tools
and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will
not prove conclusive in the diagnosis of the active electronic elements within the headlamp leveling motors or
the electronic controls and communication between other modules and devices that provide some features of the
headlamp leveling system. The most reliable, efficient, and accurate means to diagnose the headlamp leveling
motor or the electronic controls and communication related to headlamp leveling system operation requires the
use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

SWITCH-HEADLAMP LEVELING

DESCRIPTION

HEADLAMP LEVELING SWITCH

Fig. 30: Identifying Headlamp Leveling Switch
Courtesy of CHRYSLER LLC

The headlamp leveling switch (3) is used only on vehicles manufactured for certain markets where the
headlamp leveling system is required. The headlamp leveling switch is integral to the switch pod (1) on the
instrument panel. A stencil-like International Control and Display Symbol icon for Headlamp Levelling
Control identifies the headlamp leveling switch button. The switch push button is also marked with the
numbers 0 , 1 , 2 , and 3 , which indicates each of the four headlamp leveling positions. Each higher number
represents a lower aiming position of the headlamp beam relative to the road surface.

The headlamp leveling switch button has panel lamps dimmer controlled illumination for night visibility. The
switch button also features a jewel like Light Emitting Diode (LED) indicator adjacent to the numbers 1 , 2 ,
and 3 . The appropriate LED is illuminated when that headlamp position is currently selected. The momentary
switch push button is operated by depressing, then releasing the top or bottom of the button in a rocker manner
to enable the selection of a sequentially higher or lower position with each button press.

All of the circuitry and components of the headlamp leveling switch are contained within a molded black plastic
instrument panel switch pod housing. A single connector receptacle is integral to the back of the switch pod
housing. The switch is connected to the vehicle electrical system through a dedicated take out and connector of
the instrument panel wire harness.

The headlamp leveling switch cannot be adjusted or repaired and, if ineffective or damaged, the entire

2007 Dodge Nitro R/T

2007 ACCESSORIES AND EQUIPMENT Lamps/Lighting - Exterior - Service Information - Nitro

instrument panel switch pod unit must be replaced. Refer to REMOVAL .

OPERATION

HEADLAMP LEVELING SWITCH

The status of the headlamp leveling switch is continually monitored by the circuitry within the instrument panel
switch pod. The switch pod receives battery voltage at all times on a fused battery feed circuit, and a path to
ground at all times through the instrument panel wire harness. The only other inputs to and outputs from the
switch pod consist of electronic communication with the Electro Mechanical Instrument Cluster (EMIC) (also
known as the Cab Compartment Node/CCN) over the single wire Local Interface Network (LIN) data bus.

Whenever the headlamp leveling switch push button is depressed the switch pod circuitry sends 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 message 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 messages back to the switch pod 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.

The hard wired circuits for the instrument panel switch pod may be diagnosed using conventional diagnostic
tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods
will not prove conclusive in the diagnosis of the headlamp leveling switch or the electronic controls and
communication between other modules and devices that provide some features of the headlamp leveling system.
The most reliable, efficient, and accurate means to diagnose the headlamp leveling switch or the electronic
controls and communication related to headlamp leveling system operation requires the use of a diagnostic scan
tool. Refer to the appropriate diagnostic information.

LEFT MULTI-FUNCTION SWITCH

DESCRIPTION

LEFT MULTI- FUNCTION SWITCH

2007 Dodge Nitro R/T

2007 ACCESSORIES AND EQUIPMENT Lamps/Lighting - Exterior - Service Information - Nitro

Fig. 31: Identifying Control Knob, Control Stalk & Control Sleeve
Courtesy of CHRYSLER LLC

The left (lighting) multi-function switch is located on the left side of the steering column, just below the
steering wheel. This switch is the primary control for the interior and exterior lighting systems. The only visible
components of the switch are the control stalk (2), control knob (1) and control sleeve (3) that extend through
the steering column shrouds on the left side of the column. The remainder of the switch including its mounting
provisions, its electrical connection, and the turn signal cancel actuator are concealed beneath the shrouds.

Fig. 32: Steering Control Module Components
Courtesy of CHRYSLER LLC

The switch housing (2) and controls (1) are constructed of molded black plastic. Each of the switch controls has
white International Control and Display Symbol graphics applied to it, which clearly identify its many
functions. A single screw (7) through a mounting tab integral to the back of the switch housing, and a slide tab

2007 Dodge Nitro R/T

2007 ACCESSORIES AND EQUIPMENT Lamps/Lighting - Exterior - Service Information - Nitro

integral to the bottom of the switch housing secure the switch to the mounting bracket integral to the
clockspring (3).

The Steering Control Module (SCM) is internal to the switch housing. The switch outputs are internally
connected directly to the SCM. A single connector receptacle containing seven terminal pins is integral to the
inboard end of the switch housing and connects the right multi-function switch (6) through a jumper wire
harness (5) directly to the SCM. An integral connector receptacle on the back of the switch housing connects
the SCM to the vehicle electrical system through a dedicated take out and connector of the instrument panel
wire harness.

The left multi-function switch provides the vehicle operator with a control interface for the following exterior
lighting system functions:



Front Fog Lamps - For vehicles so equipped, the left multi-function switch control knob provides detent
switching for the optional front fog lamps.



Headlamps - The left multi-function switch control knob provides detent switching for the headlamps.



Headlamp Beam Selection - The left multi-function switch control stalk provides detent switching for
selection of the headlamp high or low beams.



Headlamp Optical Horn - The left multi-function switch control stalk includes momentary switching of
the headlamp high beam circuits to provide an optical horn feature (sometimes referred to as flash-to-
pass), which allows the vehicle operator to momentarily flash the headlamp high beams as an optical
signalling device.



Park Lamps - The left multi-function switch control knob provides detent switching for the park lamps.



Rear Fog Lamps - For vehicles so equipped, the left multi-function switch control knob provides detent
switching for the optional rear fog lamps. Rear fog lamps are optional only for vehicles manufactured for
certain markets, where they are required.



Turn Signal Control - The left multi-function switch control stalk provides both momentary non-detent
switching and detent switching with automatic cancellation for both the left and right turn signal lamps.

The left multi-function switch also provides the vehicle operator with a control interface for the following
interior lighting functions:



Interior Lamps Defeat - The left multi-function switch control ring provides detent switching to
DEFEAT the illumination of all interior courtesy lamps when a door, the rear flip-up glass, or the liftgate
are opened.



Interior Lamps On - The left multi-function switch control ring provides detent switching to
simultaneously illuminate all interior courtesy lamps.



Panel Lamps Dimming - The left multi-function switch control ring provides simultaneous adjustable
control of the illumination intensity of all instrument panel lighting at one of five available illumination
intensity levels.



Parade Mode - The left multi-function switch control ring provides detent switching for a PARADE
mode that maximizes the illumination intensity of all instrument panel lighting for visibility when driving
in daylight with the exterior lamps turned ON.

The left multi-function switch cannot be adjusted or repaired. If any function of the switch is ineffective, or if

2007 Dodge Nitro R/T

2007 ACCESSORIES AND EQUIPMENT Lamps/Lighting - Exterior - Service Information - Nitro