Dodge Nitro. Manual - part 637

 

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Dodge Nitro. Manual - part 637

 

 

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

  

Rear fog lamps are installed on vehicles manufactured for all export markets. The rear fog lamp system includes 
the left (lighting) multi-function switch, the SCM, the EMIC and the TIPM. The rear fog 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 to determine whether the 
rear fog lamps are selected, then sends electronic rear fog lamp switch status messages to the EMIC over the 
LIN data bus. Then the EMIC relays an electronic rear fog lamp request message to the TIPM over the CAN 
data bus. The TIPM responds to this message by providing a battery voltage output to the rear fog lamp bulbs 
through high side drivers on the fog lamp relay control rear circuit. The TIPM also sends the appropriate 
electronic message back to the EMIC to control the rear fog lamp indicator. 

The TIPM will automatically energize and de-energize the front fog lamps in concert with the rear fog lamps. 
The TIPM also provides a battery saver (load shedding) feature for the rear fog 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.

TRAILER TOW WIRING 

Domestic market vehicles equipped with an optional trailer tow package include a trailer tow take out of the 
body wire harness connected to a molded, seven-way trailer tow connector and an integral cover that are 
snapped into a bracket on the trailer hitch receiver platform. 

TURN SIGNAL LAMPS 

The turn signal lamps system includes the left (lighting) multi-function switch, the SCM, the EMIC and the 
TIPM. The front turn signal 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 a takeout with an eyelet terminal 
that is secured by a nut to a ground stud on the body sheet metal within the engine compartment. The rear turn 
signal 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 to determine the status of 
the turn signal switch, then sends the appropriate electronic turn signal switch status messages to the EMIC 
over the LIN data bus. Then the EMIC relays an electronic turn signal request message to the TIPM over the 
CAN data bus. The TIPM responds to these messages by controlling a battery voltage output and the flash rate 
for either the right or left turn signal lamps through high side drivers on the appropriate right or left turn signal 
feed circuits. The TIPM also sends the appropriate electronic messages back to the EMIC to control the 
illumination and flash rate of the right or left turn signal indicators, as well as to control the click rate of an 
electromechanical relay soldered onto the EMIC electronic circuit board that emulates the sound emitted by a 
conventional turn signal flasher. 

The EMIC also provides a turn signal ON warning that will generate repetitive chimes to indicate that a turn 
signal has been active continuously for 1.6 kilometers (1 mile) with the vehicle speed greater than 22 
kilometers-per-hour (15 miles-per hour). Vehicles built for markets other than the United States and Canada 
have a revised distance threshold of 4 kilometers (2.49 miles) for this feature. The chime will continue until the 
turn signal input becomes inactive or until the vehicle speed message indicates that the speed is less than 22 
kilometers-per-hour (15 miles-per-hour), whichever occurs first.

 

2007 Dodge Nitro R/T 

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

  

WARNING 

LAMPS/LIGHTING - EXTERIOR 

DIAGNOSIS AND TESTING 

LAMPS/LIGHTING - EXTERIOR 

The lamps and the hard wired circuits between components related to the exterior lighting system may be 
diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The 
wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire 
harness routing and retention, connector pin-out information and location views for the various wire harness 

WARNING:

To avoid serious or fatal injury eye protection should be used when 
servicing any glass components.

CAUTION: Do not contaminate the glass of halogen bulbs with fingerprints or allow 

contact with other possibly oily surfaces. Reduced bulb life will result.

CAUTION: Do not use bulbs with higher candle power than indicated in the Bulb 

Application table. See SPECIFICATIONS. In addition, do not use fuses, 
circuit breakers or relays having greater amperage value than indicated on 
the fuse panel or in the Owner's Manual. Damage to lamps, lenses, wiring 
and other related electrical components can result.

WARNING:

To avoid serious or fatal injury on vehicles equipped with airbags, disable 
the Supplemental Restraint System (SRS) before attempting any steering 
wheel, steering column, airbag, Occupant Classification System (OCS), 
seat belt tensioner, impact sensor, or instrument panel component 
diagnosis or service. Disconnect and isolate the battery negative (ground) 
cable, then wait two minutes for the system capacitor to discharge before 
performing further diagnosis or service. This is the only sure way to 
disable the SRS. Failure to take the proper precautions could result in 
accidental airbag deployment.

NOTE:

When diagnosing the exterior lighting circuits, remember that high generator 
output can burn out bulbs rapidly and repeatedly; and, that dim or flickering 
bulbs can be caused by low generator output or poor battery condition. If one of 
these symptoms is a problem on the vehicle, be certain to diagnose the battery 
and charging system, then repair as necessary.

NOTE:

A good ground is necessary for proper lighting operation. If a lighting problem 
is being diagnosed that involves multiple symptoms, systems, or components, 
the problem can often be traced to a loose, corroded, or open ground.

 

2007 Dodge Nitro R/T 

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

  

connectors, splices and grounds. 

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the exterior lighting 
system or the electronic controls or communication between modules and other devices that provide some 
features of the exterior lighting system. The most reliable, efficient, and accurate means to diagnose the exterior 
lighting system or the electronic controls and communication related to exterior lighting system operation 
requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information. 

BACKUP LAMPS 

BRAKE LAMPS 

CONDITION 

POSSIBLE CAUSES 

CORRECTION 

BACKUP LAMP DOES NOT 

ILLUMINATE

1. Ineffective or missing bulb. 1. Test and replace backup lamp bulb if 

required.

2. Ineffective ground circuit.

2. Test and repair open backup lamp 
ground circuit if required.

3. Ineffective feed circuit.

3. Test and repair open backup lamp feed 
circuit if required.

4. Ineffective switch.

4. Test and replace backup lamp switch 
(manual transmission) or transmission 
range sensor (automatic transmission) if 
required.

5. Ineffective TIPM inputs or 
outputs.

5. Use a diagnostic scan tool to test the 
TIPM inputs and outputs. Refer to the 
appropriate diagnostic information.

BACKUP LAMP DOES NOT 

EXTINGUISH

1. Ineffective feed circuit.

1. Test and repair shorted backup lamp 
feed circuit if required.

2. Ineffective switch.

2. Test and replace backup lamp switch 
(manual transmission) or transmission 
range sensor (automatic transmission) if 
required.

3. Ineffective TIPM inputs or 
outputs.

3. Use a diagnostic scan tool to test the 
TIPM inputs and outputs. Refer to the 
appropriate diagnostic information.

NOTE:

The Center High Mounted Stop Lamp (CHMSL) is illuminated by several Light-
Emitting Diode (LED) units that are soldered to the electronic circuit board 
within the lamp housing. The CHMSL is hard wired to the output of the brake 
lamp switch, while the brake lamps are powered by high side drivers within the 
TIPM based upon an input from the brake lamp switch. If the brake lamps and 
all of the LED units within the CHMSL fail to operate, diagnose and repair the 
brake lamps before attempting to repair the CHMSL. If the brake lamps operate 
but none of the CHMSL LED units illuminate, test and repair the CHMSL ground 
or feed circuit if required. If some of the CHMSL LED units operate and others 
do not, the CHMSL assembly must be replaced with a new unit.

 

2007 Dodge Nitro R/T 

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

  

 

 

 

 

 

 

 

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