1998 DODGE RAM 1500 headlamp

GROUNDS
GROUND
NUMBERLOCATION FIG.
G100 Battery Ground - Left Front Engine N/S
G101 Battery Ground - Left Front Engine N/S
G102 Battery Ground - Left Front Chassis N/S
G103 Left Front Engine Compartment 22
G104 Left Front Engine Compartment N/S
G105 Right Front Chassis 21
G106 Left Rear Engine Compartment 22, 29
G107 (Gas) Right Rear Engine Compartment 4, 8, 10
G108 Diesel Auxiliary Battery Ground N/S
G109 Diesel Auxiliary Battery Ground N/S
G114 (Diesel) Right Side Engine Compartment 10
G120 Left Side Engine 10
G201 Right Side of Instrument Panel 38
G202 Center of Instrument Panel 35, 36
G203 Center of Instrument Panel 35, 36
G204 Right Side of Instrument Panel 35
G301 Left Front Body 40, 44, 46
G302 Left Front Body 40, 44, 46
SPLICES
SPLICE
NUMBERLOCATION FIG.
S101 Left Front Fender 21
S102 Left Front Fender 23
S103 Left Rear of Engine Compartment 22, 25
S104 Front Facia 35
S105 Front Facia N/S
S106 Left Rear of Engine Compartment 22
S107 Left Front Fender 23
S108 Headlamp and Dash, Left Side 22, 25
S109 Left Front Fender 23
S110 Left Front Fender 22
S111 Center Rear of Engine Compartment N/S
S112 Right Rear of Engine 3
S114 Left Rear of Engine Compartment 23
S115 Left Rear of Engine Compartment N/S
S117 Left Rear of Engine Compartment N/S
S120 Left Front Fender 23
S121 Left Front Fender 23
DR8W-91 CONNECTOR/GROUND/SPLICE LOCATION 8W - 91 - 9
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

SPLICE
NUMBERLOCATION FIG.
S122 Left Front Fender 22
S123 Left Front Fender 22, 23
S124 Center Rear of Engine Compartment N/S
S125 Right Rear of Engine Compartment 4, 8
S130 Top Front of Transmission 3, 9
S132 Left Rear of Engine Compartment 3, 9
S133 Left Rear of Engine 4, 9
S134 Left Rear of Engine Compartment 3, 9
S135 Headlamp and Dash, Left Side N/S
S136 Left Front Fender 23
S137 Left Rear of Engine Compartment 21
S138 Left Rear of Engine N/S
S139 Right Front of Transmission N/S
S140 Right Rear Engine Compartment 22
S142 Left Side of Engine 3
S143 Left Side of Engine Compartment N/S
S144 Top Front of Transmission N/S
S145 Left Front Fender 23
S148 Top Front of Transmission 3
S149 Left Rear of Engine 6
S150 Top Center of Engine 3, 9
S153 Rear Engine Compartment N/S
S154 Left Top Engine N/S
S155 Left Rear Engine Compartment near T/O for Fuel Control Actuator 9
S157 Near T/O for Camshaft Position Sensor N/S
S158 Near T/O for C114 10
S159 Near T/O for Engine Control Module N/S
S160 Top Left Engine 10
S162 Left Side Engine N/S
S163 Right Side Engine N/S
S164 Near Engine Control Module C2 10
S165 Near Engine Control Module C2 10
S166 In Battery Positive Harness N/S
S168 Right Rear of Engine 3
S169 Right Rear of Engine 3, 7
S170 Left Engine 10
S171 Top Left Engine 10
S172 In T/O for Fuel Control Actuator N/S
S173 Near T/O for Engine Control Module N/S
S174 Near T/O for C114 N/S
S175 Near T/O for Engine Control Module N/S
8W - 91 - 10 8W-91 CONNECTOR/GROUND/SPLICE LOCATIONDR
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

(3) Connect the electrical connectors by pushing
straight on and rotating the connector arm inboard,
until the connector is firmly locked in place on the
module assembly.
(4) Grasp the integrated power module with two
hands and install the assembly on the battery tray
(Fig. 5).
(5) Install the integrated power module retaining
bolt and screw.
(6) Connect the gray connector on the integrated
power module housing.
(7) Install the B+ terminal cable and nut on the
integrated power module B+ terminal. Snap the
cover in place.
(8) Connect the negative and positive battery
cables.
FRONT CONTROL MODULE
DESCRIPTION
The Front Control Module (FCM) is a micro con-
troller based module located in the left front corner
of the engine compartment. On this model the inte-
grated power module must be positioned aside in
order to access the front control module. The front
control module mates to the power distribution cen-
ter to form the Integrated Power Module (IPM). Theintegrated power module connects directly to the bat-
tery and provides the primary means of circuit pro-
tection and power distribution for all vehicle
electrical systems. The front control module controls
power to some of these vehicle systems electrical and
electromechanical loads based on inputs received
from hard wired switch inputs and data received on
the PCI bus circuit (J1850).
For information on theIntegrated Power Mod-
ule Refer to the Power Distribution Sectionof
the service manual.
OPERATION
As messages are sent over the PCI bus circuit, the
front control module reads these messages and con-
trols power to some of the vehicles electrical systems
by completing the circuit to ground (low side driver)
or completing the circuit to 12 volt power (high side
driver). The following functions areControlledby
the Front Control Module:
²Headlamp Power with Voltage Regulation
²Windshield Wiper ªON/OFFº Relay Actuation
²Windshield Wiper ªHI/LOº Relay Actuation
²Windshield Washer Pump Motor
²Fog Lamp Relay Actuation
²Park Lamp Relay Actuation
²Horn Relay Actuation
The following inputs areReceived/Monitoredby
the Front Control Module:
²B+ Connection Detection
²Power Ground
²Ambient Temperature Sensing
²Ignition Switch Run
²Washer Fluid Level Switch
²Windshield Wiper Park Switch
²PCI Bus Circuit
DIAGNOSIS AND TESTING - FRONT CONTROL
MODULE
The front control module is a printed circuit board
based module with a on-board micro-processor. The
front control module interfaces with other electronic
modules in the vehicle via the Programmable Com-
munications Interface (PCI) data bus (J1850). In
order to obtain conclusive testing the Programmable
Communications Interface (PCI) data bus network
and all of the electronic modules that provide inputs
to, or receive outputs from the front control module
must be checked. All PCI (J1850) communication
faults must be resolved prior to further diagnosing
any front control module related issues.
The front control module was designed to be diag-
nosed with an appropriate diagnostic scan tool, such
as the DRB IIIt. The most reliable, efficient, and
accurate means to diagnose the front control module
Fig. 5 INTEGRATED POWER MODULE MOUNTING
TABS
1 - INTEGRATED POWER MODULE MOUNTING HOLES
2 - BATTERY TRAY ASSEMBLY
3 - FRONT CONTROL MODULE
DR8W-97 POWER DISTRIBUTION 8W - 97 - 5
INTEGRATED POWER MODULE (Continued)

STANDARD PROCEDURE - HYDROFORM
FENDER RAIL REPAIR
CAUTION: This repair procedure assumes damage
to the right or left hydroform fender rail (Fig. 18).
Prior to any repairs, the vehicle must be mounted
on the appropriate frame repair equipment (ªframe
rackº), checked with three dimensional measuring
equipment, and necessary pull corrections made. If
damage exists in the hydroform fender rail, or cab
beyond the area covered by this service procedure
after dimensional corrections are made, the hydro-
form must be replaced in its entirety. Refer to 23 -
BODY/BODY STRUCTURE/WELD LOCATIONS -
SPECIFICATIONS, when replacing the entire hydro-
form.
(1) Before proceding with this repair procedure
review the required service warnings and precau-
tions. (Refer to 13 - FRAME & BUMPERS/FRAME -
WARNING)
(2) Disconnect and isolate the battery negative
cable.
(3) Remove the front wheelhouse splash shield.
(Refer to 23 - BODY/EXTERIOR/FRONT WHEEL-
HOUSE SPLASH SHIELD - REMOVAL)(4) Remove the fender. (Refer to 23 - BODY/EXTE-
RIOR/FRONT FENDER - REMOVAL)
(5) Remove the A/C condenser, if required. (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMB-
ING/A/C CONDENSER - REMOVAL)
(6) Remove the A/C lines, if required. Refer to the
Heating and Air Conditioning section of the manual
for recommended procedures.
(7) Remove the radiator assembly. (Refer to 7 -
COOLING/ENGINE/RADIATOR - REMOVAL)
(8) Remove the air cleaner and support bracket, if
required. (Refer to 9 - ENGINE/AIR INTAKE SYS-
TEM/AIR CLEANER ELEMENT - REMOVAL)
(9) Remove the integrated power module. (Refer to
8 - ELECTRICAL/POWER DISTRIBUTION/INTE-
GRATED POWER MODULE - REMOVAL)
(10) Remove the bolts and position aside the wire
harness and grounds, if required.
(11) Remove the upper radiator crossmember.
(Refer to 23 - BODY/EXTERIOR/UPPER RADIATOR
CROSSMEMBER - REMOVAL)
(12) Remove the headlamp unit. (Refer to 8 -
ELECTRICAL/LAMPS/LIGHTING - EXTERIOR/
HEADLAMP UNIT - REMOVAL)
(13) Remove the front cab mount to the Front End
Sheet Metal bracket (FESM) bolt.
Fig. 18 HYDROFORM FENDER RAILS
1 - HYDROFORM FENDER RAIL
2 - FRONT END SHEET METAL BRACKET
3 - UPPER RADIATOR CROSSMEMBER BOLTS (4)4 - UPPER RADIATOR CROSSMEMBER
5 - LOWER RADIATOR CROSSMEMBER BOLTS (8)
6 - LOWER RADIATOR CROSSMEMBER
DRFRAMES & BUMPERS 13 - 11
FRAME (Continued)

(14) Remove the bolts attaching the lower radiator
crossmember to the hydroform fender rail. (Fig. 18)
CAUTION: Do not use any flame or plasma cutting
equipment to cut the frame in this procedure. The
inaccurate and high temperatures achieved during
flame or plasma cutting will change the metal char-
acteristics and may weaken the frame and/or repair
location.
(15) Using a reciprocating saw or equivalent, cut
the fender rail and shotgun at a straight and square
section of the hydroform and remove.
(16) Smooth and square the cut edges.
(17) Using the damaged structure as a reference
cut the service part at the same location as the first
cut. Smooth and square the cut edges.
NOTE: The repair structure should butt up to the
remaining structure and provide the same overall
vehicle geometry.
(18) Fabricate 51 mm (2.0 in.) long repair inserts
using scrap from the old structure or the replacement
part. It will be necessary to split the inserts on each
of their four sides to fit into the hydroform.
(19) Remove any paint or e-coat from the inserts
and also to the interior and exterior of the hydro-
forms.
(20) Cut plug weld holes as described below.
²On the upper rail, cut one 13 mm (0.5 in.) hole
on each side of the rail, 25 mm (1.0 in.) from the butt
joint of the tubes.
²On the lower rail, cut one 13 mm (0.5 in.) hole
on the top and bottom sides of the rail 25 mm (1.0
in.) from the butt joint of the tube.
²On the lower rail, cut two 13 mm (0.5 in.) holes
on the inner and outer sides of the rail 25 mm (1.0
in.) from the butt joint of the tube.
CAUTION: Shield the surrounding area and compo-
nents from exposure to the welding spatter and
heat.
(21) Install the insert 1º into the replacement part
and tack into place with a weld. (Refer to 13 -
FRAME & BUMPERS/FRAME - SPECIFICATIONS -
WELDING)
(22) Insert the service part into place and using
the appropriate measuring equipment, verify the
front end sheet metal bracket's location in all three
(X,Y, and Z) planes of space. (Fig. 19)
(23) Complete all 360É plug welds.
NOTE: Before the final welding, use three dimen-
sional measuring equipment to ensure the part is in
the correct location. Verify that tap plate extrusion
at the bottom of the vertical post lines up with theisolator and hole in the frame perch mount. Also
ensure the lower radiator closure tube is bolted into
the forward shotgun ends.
(24) Complete welding by making a 360É butt weld
around the fender rails.
(25) Metal finish the exposed welds on the hydro-
forms.
(26) Dress the welded area and apply corrosion
resistant coatings inside and out.
(a) Inside the rail, inject a creeping wax based
rust inhibitor compound to the inside of the hydro-
forms ensuring 100% coverage including the mat-
ing face between the fender rail sections and insert
such that corrosion protection is restored in the
internal cavity.
(b) Apply a durable top coat to the outside of the
repair area.
(27) Install the front cab mount bolt if previously
removed and tighten to 81 N´m (60 ft. lbs.).
(28) Install the lower radiator crossmember bolts
and tighten to 28 N´m (21 ft. lbs.).
(29) Install the headlamp unit. (Refer to 8 - ELEC-
TRICAL/LAMPS/LIGHTING - EXTERIOR/HEAD-
LAMP UNIT - INSTALLATION)
(30) Install the upper radiator crossmember. (Refer
to 23 - BODY/EXTERIOR/UPPER RADIATOR
CROSSMEMBER - INSTALLATION)
(31) Install the wire harness and ground if previ-
ously removed and install the bolts.
(32) Install the integrated power module, if previ-
ously removed. (Refer to 8 - ELECTRICAL/POWER
DISTRIBUTION/INTEGRATED POWER MODULE -
INSTALLATION)
(33) Install the air cleaner bracket and air cleaner,
if previously removed. (Refer to 9 - ENGINE/AIR
INTAKE SYSTEM/AIR CLEANER ELEMENT -
INSTALLATION)
(34) Install the radiator assembly. (Refer to 7 -
COOLING/ENGINE/RADIATOR - INSTALLATION)
(35) Install the A/C lines, if previously removed.
Refer to the Heating and Air Conditioning section of
the manual for the recommended procedures.
(36) Install the A/C condenser, if previously
removed. (Refer to 24 - HEATING & AIR CONDI-
TIONING/PLUMBING/A/C CONDENSER - INSTAL-
LATION)
(37) Install the fender. (Refer to 23 - BODY/EXTE-
RIOR/FRONT FENDER - INSTALLATION)
(38) Install the front wheelhouse splash shield.
(Refer to 23 - BODY/EXTERIOR/FRONT WHEEL-
HOUSE SPLASH SHIELD - INSTALLATION)
(39) Reconnect the battery ground.
13 - 12 FRAMES & BUMPERSDR
FRAME (Continued)

FRONT FENDER
REMOVAL
(1) Remove the antenna, if equipped. (Refer to 8 -
ELECTRICAL/AUDIO/ANTENNA BODY & CABLE -
REMOVAL)
(2) Remove the battery tray, if required. (Refer to 8
- ELECTRICAL/BATTERY SYSTEM/TRAY -
REMOVAL)
(3) Remove the cowl grille. (Refer to 23 - BODY/
EXTERIOR/COWL GRILLE - REMOVAL)
(4) Remove the headlamp unit. (Refer to 8 - ELEC-
TRICAL/LAMPS/LIGHTING - EXTERIOR/HEAD-
LAMP UNIT - REMOVAL)
(5) Remove the wheelhouse splash shield. (Refer to
23 - BODY/EXTERIOR/FRONT WHEELHOUSE
SPLASH SHIELD - REMOVAL)
(6) Remove the inside and lower bolts. (Fig. 6)
(7) Remove the two bolts below the headlamp.
(8) Remove the hinge support bolt at the cowl.
(9) Remove the three bolts along the fender rail.
INSTALLATION
(1) Install the three bolts along the upper fender
rail and tighten to 9 N´m (80 in. lbs.).
(2) Install the upper hinge support bolt at the cowl
and tighten to 17 N´m (13 ft. lbs.).
(3) Install the two bolts below the headlamp and
tighten to 9 N´m (80 in. lbs.).(4) Install the inside and lower bolts and tighten
to 17 N´m (13 ft. lbs.).
(5) Check the fender positioning and adjust as
required by adding shims. (Refer to 23 - BODY/
BODY STRUCTURE/GAP AND FLUSH - SPECIFI-
CATIONS)
(6) Install the wheelhouse splash shield. (Refer to
23 - BODY/EXTERIOR/FRONT WHEELHOUSE
SPLASH SHIELD - INSTALLATION)
(7) Install the headlamp unit. (Refer to 8 - ELEC-
TRICAL/LAMPS/LIGHTING - EXTERIOR/HEAD-
LAMP UNIT - INSTALLATION)
(8) Install the cowl grille. (Refer to 23 - BODY/EX-
TERIOR/COWL GRILLE - INSTALLATION)
(9) Install the battery tray, if required. (Refer to 8
- ELECTRICAL/BATTERY SYSTEM/TRAY -
INSTALLATION)
(10) Install the antenna, if required. (Refer to 8 -
ELECTRICAL/AUDIO/ANTENNA BODY & CABLE -
INSTALLATION)
FUEL FILL DOOR
REMOVAL
(1) Open fill door and remove the bolts. (Fig. 7)
(2) Remove the door.
INSTALLATION
(1) Install the fuel fill door.
(2) Install the bolts and tighten to 9 N´m (80 in.
lbs.).
Fig. 6 FRONT FENDER
1 - HOOD HINGE SUPPORT BOLT (1)
2 - HOOD HINGE
3 - INNER BOLT (1)
4 - FRONT BOLTS (2)
5 - LOWER BOLT INSERT
6 - FENDER
7 - UPPER BOLTS (3)
Fig. 7 FUEL FILL DOOR
1 - FUEL FILL DOOR
2 - BOLTS (2)
DREXTERIOR 23 - 39

INSTRUMENT PANEL
TABLE OF CONTENTS
page page
CLUSTER BEZEL
REMOVAL.............................49
INSTALLATION.........................49
ASH RECEIVER
REMOVAL.............................50
INSTALLATION.........................51
CUP HOLDER
REMOVAL.............................51
INSTALLATION.........................51
GLOVE BOX
REMOVAL.............................52
INSTALLATION.........................52
GLOVE BOX LATCH
REMOVAL.............................52
INSTALLATION.........................52
INSTRUMENT PANEL ASSEMBLY
REMOVAL.............................52
INSTALLATION.........................55
INSTRUMENT PANEL HEADLAMP SWITCH
BEZEL
REMOVAL.............................56
INSTALLATION.........................56INSTRUMENT PANEL CENTER BEZEL
REMOVAL.............................57
INSTALLATION.........................57
INSTRUMENT PANEL DRIVER SIDE BEZEL
REMOVAL.............................58
INSTALLATION.........................58
INSTRUMENT PANEL TOP COVER
REMOVAL.............................58
INSTALLATION.........................59
INSTRUMENT PANEL LOWER SURROUND
REMOVAL.............................59
INSTALLATION.........................59
STEERING COLUMN OPENING COVER
REMOVAL.............................60
INSTALLATION.........................60
STEERING COLUMN OPENING SUPPORT
BRACKET
REMOVAL.............................60
INSTALLATION.........................60
STORAGE BIN
REMOVAL.............................61
INSTALLATION.........................61
CLUSTER BEZEL
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Remove the headlamp switch bezel. (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL SWITCH BEZEL - REMOVAL)
(2) Remove the center bezel. (Refer to 23 - BODY/
INSTRUMENT PANEL/INSTRUMENT PANEL
CENTER BEZEL - REMOVAL)(3) Remove the two top screws. (Fig. 1)
(4) Using a trim stick C-4755 or equivalent, sepa-
rate the two lower clips.
(5) Disengage the two top attachment bosses and
remove the bezel.
INSTALLATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Position the cluster bezel over the cluster and
seat the outer bosses over the posts on the left and
right sides.
DRINSTRUMENT PANEL 23 - 49

(2) Snap the top edge of the bezel into place fully.
(3) Seat the two bottom clips fully.
(4) Install the two top screws.
(5) Install the center bezel (Refer to 23 - BODY/
INSTRUMENT PANEL/INSTRUMENT PANEL
CENTER BEZEL - INSTALLATION)
(6) Install the headlamp switch bezel. (Refer to 23
- BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL SWITCH BEZEL - INSTALLATION)
ASH RECEIVER
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.(1) Open ash receiver and place hand inside. (Fig.
2)
(2) Apply force with anabruptdownward motion
and roll rearward. (Fig. 3)
(3) Dislodge and roll ash receiver out of panel to
remove.
Fig. 1 CLUSTER BEZEL
1 - INSTRUMENT PANEL
2 - SCREWS (2)
3 - CLUSTER BEZEL
4 - CLIP FASTENERS (2)
Fig. 2 ASH RECEIVER
1 - ASH RECEIVER
2 - CUP HOLDER
Fig. 3 ASH RECEIVER REMOVAL
1 - LOCKING TABS
2 - CUP HOLDER
3 - ASH RECEIVER
23 - 50 INSTRUMENT PANELDR
CLUSTER BEZEL (Continued)