diagram DODGE RAM 1999 Service Manual PDF

Fig. 17: Heater System Wiring Diagram (Ram Pickup)

Fig. 18: Heater System Wiring Diagram (Ram Van/Wagon)

HO W T O U SE S YSTE M W IR IN G D IA G RAM S
1999 D odge P ic ku p R 1500
GENERAL INFORMATION
Using Wiring Diagrams
All Models
INTRODUCTION
This CD obtains wiring diagrams and technical service
bulletins, containing wiring diagram changes from the domestic and
import manufacturers. These are checked for accuracy and are all
redrawn into a consistent format for easy use.
In the past, when cars were simpler, diagrams were simpler.
All components were connected by wires and diagrams seldom exceeded 4
pages in length. Today, some wiring diagrams require more than 16
pages. It would be impractical to expect a service technician to trace
a wire from page 1 across every page to page 16.
Removing some of the wiring maze reduces eyestrain and time
wasted searching across several pages. Today the majority of
these

diagrams follow a much improved format, which permits space for
internal switch details.
Wiring diagrams are drawn in a "top-down" format. The
diagrams are drawn with the power source at the top of the diagram and
the ground point at the bottom of the diagram. Components locations
are identified on the wiring diagrams. Any wires that don't connect
directly to a component are identified on the diagram to indicate
where they go.
COLOR ABBREVIATIONS
COLOR ABBREVIATIONS TABLE








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Color Normal Optional
Black ................ BLK .......................... BK
Blue ................. BLU .......................... BU
Brown ................ BRN .......................... BN
Clear ................ CLR .......................... CR
Dark Blue .......... DK BLU ...................... DK BU
Dark Green ......... DK GRN ...................... DK GN
Green ................ GRN .......................... GN
Gray ................. GRY .......................... GY
Light Blue ......... LT BLU ...................... LT BU
Light Green ........ LT GRN ...................... LT GN
Orange ............... ORG .......................... OG
Pink ................. PNK .......................... PK
Purple ............... PPL .......................... PL
Red .................. RED .......................... RD
Tan .................. TAN .......................... TN
Violet ............... VIO .......................... VI
White ................ WHT .......................... WT
Yellow ............... YEL .......................... YL









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IDENTIFYING WIRING DIAGRAM ABBREVIATIONS
NOTE: Abbreviations used on these diagrams are normally
self-explanatory. If necessary see ABBREVIATIONS

article in GENERAL INFORMATION.
IDENTIFYING WIRING DIAGRAM SYMBOLS
NOTE: Standard wiring symbol are used in these diagrams. The
illustration below will help clarify any symbols that are
not easily understood at a glance. Most components are
labeled "Motor", "Switch" or "Relay" in addition to being
drawn with the standard symbol.
Fig. 1: Identifying Wiring Diagram Symbols

WIRING DIAGRAM COMPONENT LOCATIONS
When trying to locate a component in a wiring diagram and you
don't know the specific system where it is located, use this handy
component locator to find the system wiring diagram in which the
component is located. Then, go to that system and locate the component
within the wiring diagram.
For example, if you don't know the specific system in which
the ignition switch is located, look up ignition switch in the wiring
diagram component location tables and go to the appropriate wiring
diagram(s) which contain either full or partial views of the ignition
switch. The full view of the ignition switch is located in Power
Distribution.
The first listing for the component will be the full or most
complete view of the component. Additional listings will be partial
views of the component. Not all components are used on all models.
All components will have a partial view in Ground
Distribution and Power Distribution. Data Link Connectors show
connecting circuits between modules. Alternate names for components
may be listed in wiring diagram component locations tables.
WIRING DIAGRAM COMPONENT LOCATIONS TABLE









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Component Wiring Diagram
ABS Electronic Control Unit ....................... Anti-Lock Brakes
Data Link Connectors
ABS Hydraulic Unit ................................ Anti-Lock Brakes
Acceleration Sensor ............................... Anti-Lock Brakes
Accessory Delay Relay ................................ Power Windows
A/C Compressor Clutch Relay ..................... Engine Performance
A/C Sensor ...................................... Engine Performance
A/C Pressure Switch ............................. Engine Performance
Adaptive Lamp Control Module ....................... Exterior Lights
Air Bag(s) ................................ Air Bag Restraint System\
Air Bag Module ............................ Air Bag Restraint System
Air Bag Sensor(s) ......................... Air Bag Restraint System\
Air Injection Pump Relay ........................ Engine Performance
Air Temperature Sensor ............................ Overhead Console
Alternator (Generator) ..................... Generators & Regulators\
Anti-Theft Control Module ........................ Anti-Theft System
Starters
Autolamp Control Relay ........................... Headlight Systems
Daytime Running Lights
Automatic Shutdown (ASD) Relay .................. Engine Performance\
Generators & Regulators
Autostick Switch ................................ Engine Performance
Auxiliary Battery Relay .................... Generators & Regulators
Back-Up Lights ...................................... Back-Up Lights
Exterior Lights
Barometric (BARO) Pressure Sensor ............... Engine Performance\
Battery ......................................... Power Distribution
Battery Temperature Sensor ...................... Engine Performance
Body Control Module .......................... Body Control Computer
Anti-Theft System
Daytime Running Lights
Engine Performance
Headlight Systems
Warning Systems
Boost Control Solenoid .......................... Engine Performance
Boost Sensor .................................... Engine Performance
Brake Fluid Level Switch .................. Analog Instrument Panels

systems may lose memory data. Driveability problems may exist
until computer systems have completed a relearn cycle. See
COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION
before disconnecting battery.
NOTE: Testing of instrument panel and gauges requires using a scan
tool to check circuits connected to Body Control Module
(BCM). See appropriate BODY CONTROL COMPUTER TESTS article.
PRELIMINARY DIAGNOSIS
NOTE: There are 2 instrument cluster connectors. These connectors
look identical. Identify connectors by wire color. See WIRING
DIAGRAMS.
Ram Pickup
1) If CCD bus controlled indicator lights and gauges do not
operate, go to step 4). If indicator lights operate and all gauges do
not operate, go to next step.
2) Check for battery voltage between ground and both sides of
fuse No. 14 in junction block. If battery voltage exists on both
sides, go to next step. If battery voltage exists on one side only,
repair short circuit and replace fuse. If battery voltage does not
exist on both sides, locate and repair open circuit. See WIRING
DIAGRAMS.
3) Disconnect negative battery cable. Remove instrument
cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Connect
negative battery cable. Measure voltage between ground and terminal
No. 6 (Yellow wire) of instrument cluster connector C1. See Fig. 1. If
battery voltage is present, reinstall instrument cluster and go to
SELF-DIAGNOSTICS. If battery voltage is not present, repair open
circuit between fuse No. 14 in junction block and instrument cluster
connector C1.
4) Turn ignition on. Measure voltage between ground and both
sides of fuse No. 17 (10-amp) in junction block. If battery voltage
exists on both sides, go to next step. If battery voltage exists on
one side only, repair short circuit and replace fuse. If battery
voltage does not exist on both sides, repair open Dark Blue wire
between ignition switch and junction block.
5) Turn ignition off. Disconnect negative battery cable.
Reconnect instrument cluster. See INSTRUMENT CLUSTER under REMOVAL &
INSTALLATION. Connect negative battery cable. Turn ignition on. Set
parking brake and observe instrument cluster brake warning light. If
brake warning light is off, go to step 7). If brake warning light is
on, go to next step.
6) Turn ignition off. Turn parking lights on and adjust
instrument panel lights dimmer rheostat to full bright position. If
instrument panel lights are on, go to step 8). If instrument panel
lights are off, repair open ground circuit to instrument cluster
connector C1 terminal No. 4 (Black/Light Green wire) or No. 5
(Black/Orange wire). See WIRING DIAGRAMS.
7) Turn ignition off and disconnect negative battery cable.
Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL &
INSTALLATION. Connect negative battery cable. Turn ignition on.
Measure voltage between ground and instrument cluster connector C1
terminal No. 2 (Dark Blue/White wire). If battery voltage exists, go
to SELF-DIAGNOSTICS. If battery voltage does not exist, repair open
Dark Blue/White wire.
8) Turn ignition off. Disconnect negative battery cable.
Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL &
INSTALLATION. Using an ohmmeter, check continuity between ground and
instrument cluster connector C1 terminals No. 4 (Black/Light Green
wire) and No. 5 (Black/Orange wire). If continuity exists, go to SELF\
-

cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION.
Reconnect negative battery cable. Measure voltage between ground and
terminal No. 6 (Pink/White wire) of instrument cluster connector C1.
See Fig. 1 . If battery voltage is present, reinstall instrument
cluster and go to SELF- DIAGNOSTICS. If battery voltage is not
present, repair open circuit between fuse No. 12 (15-amp) in junction
block and instrument cluster connector C1 and go to next step.
5) Remove and inspect fuse No. 11 (10-amp) in junction block\
.
If fuse is okay, go to next step. If fuse is blown, locate and repair
cause of blown fuse. Install new fuse and recheck system operation.
6) Turn ignition on. Measure voltage between ground and power
side (Dark Blue/White wire) of fuse No. 11 (10-amp) in junction bloc\
k.
If battery voltage is present, go to step 8). If battery voltage is
not present, locate and repair open circuit to fuse No. 11. See WIRING
DIAGRAMS.
7) Turn ignition off and disconnect negative battery cable.
Install instrument cluster. Connect negative battery cable. Turn
ignition on. Set parking brake and observe instrument cluster brake
warning light. If brake warning light is on, go to next step. If brake
warning light is off, go to step 9).
8) Turn ignition off. Turn parking lights on and adjust
instrument panel lights dimmer rheostat to full bright position. If
instrument panel lights are on, go to step 10). If instrument panel
lights are off, repair instrument cluster illumination ground circuit
between instrument cluster connector C2 terminal No. 7 (Black wire)
and ground. See WIRING DIAGRAMS.
9) Turn ignition off and disconnect negative battery cable.
Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL &
INSTALLATION. Connect negative battery cable. Turn ignition on.
Measure voltage between ground and terminal No. 2 (Dark Blue/White
wire) at instrument cluster connector C1. If battery voltage is
present, go to SELF-DIAGNOSTICS. If battery voltage is not present,
repair open circuit between junction block fuse No. 11 and instrument
cluster.
10) Turn ignition off and disconnect negative battery cable.
Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL &
INSTALLATION. Check continuity between ground and terminal No. 4
(Black/Dark Green wire) at instrument cluster connector C1. If
continuity exists, go to SELF-DIAGNOSTICS. If continuity does not
exist, locate and repair open in ground circuit.
SELF-DIAGNOSTICS
1) With ignition off, press and hold trip odometer RESET
button while turning ignition switch to ON position. Continue to hold
RESET button until odometer window displays CHEC (about 10 seconds).
Release RESET button. If problem exists, system will display
Diagnostic Trouble Codes (DTC). See DIAGNOSTIC CODE CHART table. For
repairs of DTCs, see appropriate BODY CONTROL COMPUTER TESTS article.
DIAGNOSTIC TROUBLE (DTC) CODE CHART







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DTC Description  Correction 




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110 Cluster CPU, RAM Or EEPROM Fault  Replace Cluster 




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900 CCD Bus Inoperative Check CCD Bus Connections At

  Cluster; Check Cluster 

  Fuses; Check CCD Bus Bias;

  Check CCD Bus Voltage; 

  Check CCD Bus Terminations 




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920 Not Receiving VSS Message From PCM Check PCM Software Level; 

   Use Scan Tool To Verify VSS

  Signal Is Sent By PCM 




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921 Not Receiving Distance Pulse  Check PCM Software Level; 

 Message From PCM  Use Scan Tool To Verify 

  Distance Pulse Message Is 

  Sent By PCM 




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940 Not Receiving Air Bag Light On Check CCD Bus Connections At

 Message From Air Bag Module  ACM; Check ACM Fuse 




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950 Not Receiving ABS Light On Message Check CCD Bus Connections 

From Anti-lock Brake Control ModuleAt Anti-Lock Control Module;

  Check Anti-Lock Control 

  Module Fuse 




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999 Undefined Error  Record Failure Message; 

  Press RESET Button To 

  Continue Self-Diagnostic 

  Test 










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2) If no DTCs appear, cluster will start a walking segment
test. First, all segments will be illuminated, then each segment in
sequence. If any segment does not illuminate, repeat test to confirm
and replace instrument cluster. When walking segment test is complete,
bulb check will start.
3) If any bulb does not light, remove instrument cluster and
check bulb and bulb holder. See INSTRUMENT CLUSTER under REMOVAL &
INSTALLATION. Ensure bulb holder is properly installed in cluster. If
bulb and bulb holder are okay, replace instrument cluster. If LED does
not light, replace instrument cluster. When bulb check is complete,
gauge actuator test will start.
4) Each gauge needle should stop at 3 calibration points,
then return to relaxed position. If any gauge does not perform as
specified, remove instrument cluster. See INSTRUMENT CLUSTER under
REMOVAL & INSTALLATION. Inspect all connections between printed
circuit board and gauge terminals, repair as necessary. If connections
are okay, replace instrument cluster. Instrument cluster will
automatically exit self-diagnostics when test is complete.

SYSTEM TESTS
NOTE: There are 2 instrument cluster connectors. These connectors
look identical. Identify connector by wire color. See WIRING
DIAGRAMS.
BRAKE WARNING LIGHT INOPERATIVE
1) Ensure parking brake is released. Turn ignition on. If
brake warning light stays on, check and repair hydraulic brake system
as necessary. See appropriate DISC & DRUM article in BRAKES section.
2) If brake warning light does not illuminate when ignition
is on, check fuse No. 17 (10-amp) on Ram Pickup or fuse No. 11 (10-
amp) on Ram Van and Ram Wagon in junction block. Junction block is
located at left end cover of instrument panel. If fuse is okay, go to
next step. If fuse is blown, locate and repair cause of blown fuse.
Install new fuse and recheck system operation.
3) Turn ignition on. Measure voltage between ground and power
side of fuse No. 17 on Ram Pickup or fuse No. 11 on Ram Van and Ram
Wagon. If battery voltage is present, go to next step. If battery
voltage is not present, locate and repair open circuit between to

junction block. See WIRING DIAGRAMS.
4) Turn ignition off. Disconnect negative battery cable.
Disconnect parking brake switch connector. Switch is located at base
of parking brake lever. Ensure parking brake lever is released. Check
continuity between ground and parking brake switch terminal. If
continuity does not exist, go to next step. If continuity exists,
adjust or replace parking brake switch.
5) Ensure parking brake switch is still disconnected. Turn
ignition off. Remove instrument cluster. See INSTRUMENT CLUSTER under
REMOVAL & INSTALLATION. Check continuity between ground and park brake
switch connector. If continuity does not exist, go to next step. If
continuity exists, repair short to ground between instrument cluster
and park brake switch.
6) Check continuity between park brake switch connector and
instrument cluster connector C1, terminal No. 3 (White/Pink wire on
Ram Van and Ram Wagon; White/Light Green wire on Ram Pickup). See
Fig. 1. If continuity does not exist, repair open circuit. See WIRING
DIAGRAMS. If continuity exists, see PRELIMINARY DIAGNOSIS under SELF-
DIAGNOSTIC SYSTEM.
FOUR WHEEL DRIVE (4WD) LIGHT INOPERATIVE (RAM PICKUP)
1) Remove and inspect fuse No. 17 (10-amp) in junction block\
.
Junction block is located at left end cover of instrument panel. If
fuse is okay, go to next step. If fuse is blown, locate and repair
cause of blown fuse. Install new fuse and recheck system operation.
2) Turn ignition on. Measure voltage between ground and power
side of fuse No. 17. If battery voltage is present, go to next step.
If battery voltage is not present, locate and repair open circuit
between ignition switch and junction block.
3) Turn ignition off. Disconnect negative battery cable.
Disconnect 4WD switch connector. 4WD switch connector is located at
right side of front axle. Check continuity between 4WD switch
connector Black wire and ground. If continuity does not exist, repair
open Black wire between 4WD switch and ground. If continuity exists,
go to next step.
4) Reconnect battery cable. Turn ignition on. Install jumper
wire between 4WD switch connector terminals. 4WD light should
illuminate. If light illuminates, replace 4WD switch. If light does
not illuminate, go to next step.
5) Turn ignition off. Disconnect negative battery cable.
Ensure 4WD switch is still disconnected. Remove instrument cluster.
See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Check continuity
between ground and instrument cluster connector C2 terminal No. 10
(Gray wire). See Fig. 1. If continuity does not exist, go to next
step. If continuity exists, repair short to ground in wire between
instrument cluster and 4WD switch.
6) Check continuity of wire between 4WD switch connector and
terminal No. 10 at instrument cluster connector C2. If continuity does
not exist, repair open wire. If continuity exists, replace bulb.
LOW WASHER FLUID LIGHT INOPERATIVE
1) Remove and inspect fuse No. 17 (10-amp) on Ram Pickup or
fuse No. 11 (10-amp) on Ram Van and Ram Wagon in junction block.
Junction block is located at left end cover of instrument panel. If
fuse is okay, go to next step. If fuse is blown, locate and repair
cause of blown fuse. Install new fuse and recheck system operation.
2) Turn ignition on. Measure voltage between ground and power
side of fuse No. 14 (10-amp) on Ram Pickup or fuse No. 11 (10-amp) o\
n
Ram Van and Ram Wagon. If battery voltage is present, go to next step.
If battery voltage is not present, locate and repair open circuit
between ignition switch and junction block.

WIRING DIAGRAMS
Fig. 9: Analog Instrument Panel Wiring Diagram (Ram Pickup - 1 Of 2)