Dodge Ram Truck 1500-2500-3500. Manual - part 451

PANEL LAMPS DIMMER CIRCUIT

NOTE: As part of the exterior lighting failsafe feature, upon ignition On all of the panel lamps dimmer circuit
lamps will illuminate at full intensity and the exterior park lamps and headlamp low beams will illuminate
regardless of the headlamp switch position if the instrument cluster cannot detect an input from the head-
lamp switch, or if there is a loss of data bus communication.

CONDITION

POSSIBLE CAUSES

CORRECTION

A SINGLE LAMP DOES NOT

ILLUMINATE

1. Faulty or missing bulb.

1. Test and replace lamp bulb as required.

2. Faulty ground circuit.

2. Test and repair lamp ground circuit as
required.

3. Faulty feed circuit.

3. Test and repair open feed circuit as
required.

A SINGLE LAMP DOES NOT

EXTINGUISH

1. Faulty feed circuit.

1. Test and repair shorted feed circuit as
required.

ALL LAMPS DO NOT

ILLUMINATE

1. Faulty headlamp switch.

1. Test and replace the headlamp switch as
required.

2. Faulty ElectroMechanical
Instrument Cluster (EMIC),
EMIC input, or EMIC output.

2. Use a diagnostic scan tool to test the
EMIC, its inputs, and its outputs. Refer to
the appropriate diagnostic information.

ALL LAMPS ILLUMINATE AT

FULL INTENSITY AT IGNITION

1. Loss of data bus
communication.

1. Use a diagnostic scan tool to test the
data bus. Refer to the appropriate
diagnostic information.

SPECIFICATIONS

LAMPS/LIGHTING - INTERIOR

COURTESY LAMPS

BULB APPLICATION TABLE

LAMP

BULB

CARGO LAMP

912

DOME LAMP (NON-SWITCHED OR SWITCHED)

578

FRONT DOME/READING WITH OVERHEAD
CONSOLE AND WITHOUT SUNROOF

212-2

FRONT DOME/READING WITH OVERHEAD
CONSOLE AND WITH SUNROOF

192

GLOVE BOX LAMP

194

VANITY LAMP

PANEL LAMPS

BULB APPLICATION TABLE

LAMP

BULB

COMPASS MINI-TRIP CONTROL

MOPAR 04437661

A/C-HEAT CONTROL

MOPAR 05135537AA

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LAMPS/LIGHTING - INTERIOR - SERVICE INFORMATION

DR/DH

CARGO LAMP

REMOVAL

NOTE: The Center High Mounted Stop Lamp (CHMSL) houses three bulbs. The center bulb is the CHMSL
bulb and illuminates through a red lens, while the two outboard bulbs are for the cargo lamps and illumi-
nate through clear lenses. The bulb types and service procedures are identical for all three of these bulbs.

1. Disconnect and isolate the battery negative cable.

2. Remove the two screws that secure the CHMSL to

the rear cab roof header panel.

3. Pull the CHMSL lens and housing (1) away from

the header panel far enough to access the lamp
wiring and bulb sockets on the back of the lamp.

4. Firmly grasp the socket (3) on the back of the lamp

housing and rotate it counterclockwise about 30
degrees to unlock it.

5. Pull the socket and bulb straight out from the

keyed opening in the housing.

6. Pull the base of the bulb (2) straight out of the

socket.

INSTALLATION

CAUTION: Always use the correct bulb size and type for replacement. An incorrect bulb size or type may
overheat and cause damage to the lamp, the socket and/or the lamp wiring.

1. Align the base of the bulb (2) with the socket (3).

2. Push the bulb straight into the socket until the base

is firmly seated.

3. Align the socket and bulb with the keyed opening

on the back of CHMSL housing (1).

4. Insert the socket and bulb into the housing until the

socket is firmly seated.

5. Rotate the socket clockwise about 30 degrees to

lock it into place.

6. Position the CHMSL into the opening in the rear

cab roof header panel.

7. Install and tighten the two screws (passenger side

first) that secure the CHMSL to the header panel.
Tighten the screws to 2 N·m (20 in. lbs.).

8. Reconnect the battery negative cable.

DR/DH

LAMPS/LIGHTING - INTERIOR - SERVICE INFORMATION

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ILLUMINATION LAMP

REMOVAL

BULB - CMTC CONTROL

WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, 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 diag-
nosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the
proper precautions could result in accidental airbag deployment.

NOTE: There are provisions for three bulb/bulb holder units on the Compass Mini-Trip Computer (CMTC)
circuit board. The two outboard bulbs illuminate the CMTC push buttons, while the center bulb illuminates
the optional universal transmitter push buttons. Therefore, the center bulb location is only populated on
vehicles equipped with the optional universal transmitter.

1. Disconnect and isolate the battery negative cable.

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

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

3. Use a small thin-bladed screwdriver to rotate the

bulb holder (3) counterclockwise about 30 degrees
to unlock it from the keyed opening in the Com-
pass Mini-Trip Computer (CMTC) unit (2) circuit
board.

4. Pull the bulb holder and bulb straight out of the cir-

cuit board.

BULB - A/C-HEAT CONTROL

NOTE: There may be minor variations in the locations of the bulb/bulb holder units on the back of the A/C-
heater control as a result of various optional A/C-heater control units. However, the bulb types and service
procedures are identical for all of these bulbs.

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DR/DH

1. Disconnect and isolate the battery negative cable.

2. Remove the center bezel from the instrument

panel. (Refer to 23 - BODY/INSTRUMENT PANEL/
INSTRUMENT

PANEL

CENTER

BEZEL

REMOVAL).

3. Use a small thin-bladed screwdriver to rotate the

bulb holder (2) counterclockwise about 30 degrees
to unlock it from the keyed opening in the A/C-
heater control (1) circuit board.

4. Pull the bulb holder and bulb straight out of the cir-

cuit board.

INSTALLATION

BULB - CMTC CONTROL

CAUTION: Always use the correct bulb size and type for replacement. An incorrect bulb size or type may
overheat and cause damage to the lamp, the socket and/or the lamp wiring.

1. Align the bulb holder and bulb (3) with the keyed

opening in the circuit board of the Compass Mini-
Trip Computer (CMTC) (2).

2. Insert the bulb holder and bulb straight into the cir-

cuit board until the bulb holder is firmly seated.

3. Using a small thin-bladed screwdriver, rotate the

bulb holder clockwise about 30 degrees on the cir-
cuit board to lock it into place.

4. Reinstall the overhead console (1) onto the head-

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

5. Reconnect the battery negative cable.

DR/DH

LAMPS/LIGHTING - INTERIOR - SERVICE INFORMATION

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