Dodge Ram Truck 1500-2500-3500. Manual — part 463

COMPASS VARIATION ADJUSTMENT

Compass variance, also known as magnetic declination, is the difference in angle between magnetic north and true
geographic north. In some geographic locations, the difference between magnetic and geographic north is great
enough to cause the compass to give false readings. If this problem occurs, the compass variance must be set.

To set the compass variance:

1. Using the Variance Settings map, find your geographic location and note the zone number.

2. Turn the ignition switch to the On/Run position. If the compass/temperature data is not currently being displayed,

momentarily depress and release the C/T push button to step through the display options until you have reached
the compass/temperature display.

3. Press and hold the Reset push button down until “VAR” appears in the display. This takes about five seconds.

4. Momentarily depress and release the STEP push button to step through the zone numbers (1-15), until the zone

number for your geographic location appears in the display.

5. Momentarily depress and release the Reset push button to enter the displayed zone number into the compass

unit memory.

6. Confirm that the correct directions are now indicated by the compass.

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REMOVAL

1. Disconnect and isolate the battery negative cable.

2. Remove the overhead console (1) from the head-

liner (Refer to 8 - ELECTRICAL/OVERHEAD CON-
SOLE - REMOVAL).

3. Remove the screws (4) that secure the Electronic

Overhead Module (EOM) (2) to the overhead con-
sole housing (1).

4. Disconnect the overhead console wire harness

connector from the EOM connector receptacle.

5. Remove the EOM (2) from the overhead console

housing (1).

INSTALLATION

NOTE: If a new Electronic overhead Module (EOM) has been installed, the compass will have to be cali-
brated and the variance set. (Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE/COMPASS/MINI-TRIP COM-
PUTER - STANDARD PROCEDURE - COMPASS CALIBRATION) and (Refer to 8 - ELECTRICAL/OVERHEAD
CONSOLE/COMPASS/MINI-TRIP COMPUTER - STANDARD PROCEDURE - COMPASS VARIATION ADJUST-
MENT) for the appropriate procedures.

1. Position the Electronic overhead Module (EOM) (2)

onto the overhead console housing (1).

2. Reconnect the overhead console wire harness con-

nector to the EOM connector receptacle.

3. Install the screws (4) that secure the EOM (2) to

the overhead console housing (1). Tighten the
screws to 2.2 N·m (20 in. lbs.).

4. Install the overhead console (1) onto the headliner

(Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE
- INSTALLATION).

5. Reconnect the battery negative cable.

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UNIVERSAL TRANSMITTER

DESCRIPTION

The universal transmitter transceiver is integral to the
overhead console (7). The only visible component of
the universal transmitter are the three transmitter push
buttons (3). The buttons are marked with one, two or
three dots, respectively, for identification of each chan-
nel.

Each of the three universal transmitter push buttons
controls an independent radio transmitter channel.
Each of these three channels can be trained to trans-
mit a different radio frequency signal for the remote
operation of garage door openers, motorized gate
openers, home or office lighting, security systems or
just about any other device that can be equipped with
a radio receiver in the 286 to 399 MegaHertz (MHz)
frequency range for remote operation. The universal
transmitter is capable of operating systems using
either rolling code or non-rolling code technology.

The universal transmitter cannot be repaired, and is
available for service only as part of the Electronic
Overhead Module (EOM). This unit includes the push button switches for both the transmitter and compass mini trip
computer, The Vacuum-Fluorescent Display (VFD) and the plastic module case. (Refer to 8 - ELECTRICAL/OVER-
HEAD CONSOLE/COMPASS/MINI-TRIP COMPUTER - REMOVAL) for EOM replacement.

OPERATION

The universal transmitter operates on a non-switched source of battery current so the unit will remain functional,
regardless of the ignition switch position. It can learn and store three separate transmitter radio frequency codes to
operate garage door openers, security gates and security lighting. The overhead console display provides visual
feedback to the driver, showing which transmitter button is pressed. The system will not send operating signals if the
vehicle theft security alarm is armed. This prevents a perpetrator from breaking into a vehicle parked outside a
home and using the transmitter system to enter the home.

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DIAGNOSIS AND TESTING

UNIVERSAL TRANSMITTER

If both the Transmitter and the compass mini trip com-
puter display are inoperative, (Refer to 8 - ELECTRI-
CAL/OVERHEAD

CONSOLE/COMPASS/MINI-TRIP

COMPUTER - DIAGNOSIS AND TESTING) for further
diagnosis. If the Universal Transmitter is inoperative,
but the compass mini trip computer display is operat-
ing normally, (Refer to 8 - ELECTRICAL/OVERHEAD
CONSOLE/UNIVERSAL

TRANSMITTER

-

STAN-

DARD PROCEDURE) for instructions on training the
Transmitter. Retrain the Transmitter with a known
good transmitter as instructed and test the Transmitter
operation again. If the unit is still inoperative, test the
universal transmitter with the Radio Frequency Detec-
tor special tool as described below:

1. Turn the Radio Frequency (RF) Detector ON. A

“chirp” will sound and the green power LED will
light. If the green LED does not light, replace the
battery.

2. Hold the RF detector within one inch of the

TRAINED universal transmitter and press any of
the transmitters buttons.

3. The red signal detection LEDs will light and the tool

will beep if a radio signal is detected. Repeat this
test for each button. If any button is inoperative,
replace the universal transmitter assembly, (Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE/COMPASS/MINI-
TRIP COMPUTER - REMOVAL).

For complete circuit diagrams, refer to the appropriate wiring information. The wiring information includes wir-
ing 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 connectors, splices and grounds.

STANDARD PROCEDURE

PROGRAMMING TRANSMITTER CODES

CAUTION: Vehicle exhaust contains carbon monoxide, a dangerous gas. Do not run the vehicle’s exhaust
while training the transceiver. Exhaust gas can cause serious injury or death.

CAUTION: Your motorized door or gate will open and close while you are training the Universal Transceiver.
Do not train the transceiver if people or pets are in the path of the door or gate. A moving door or gate can
cause serious injury or death to people and pets or damage to objects.

1. Press and hold the two outer HomeLink buttons, and release only when the EVIC display shows “Channels

Cleared” (after 20 seconds). Do not hold the buttons for longer than 30 seconds and do not repeat step one to
program a second and/or third hand-held transmitter to the remaining two HomeLink buttons.

2. Position the end of your hand-held transmitter 1-3 inches (3-8 cm) away from the HomeLink buttons.

3. Simultaneously press and hold both the HomeLink button that you want to train and the hand-held transmitter

buttons. Do not release the buttons until step 4 has been completed.

4. The EVIC display will show “Channel X Training” (where X is Channel 1, 2, or 3). Release both buttons after the

EVIC display shows “Channel X Trained”.

NOTE: If the EVIC display shows “Did Not Train” repeat steps 2–4.

RADIO FREQUENCY DETECTOR #9001

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