ignition DODGE RAM 1999 Service Repair Manual

Fig. 20: Underhood Power Distribution Center
Courtesy of Chrysler Corp.
WARNING: Always disconnect battery ground cable before servicing
"high-current fuses. It is recommended that "high-current"
fuses be replaced by a qualified technician.
Power Distribution Center Relay & Fuse Identification
A - Starter Relay
B - Trailer Lights Relay
C - Auto Transmission Relay
D - Anti-Lock Brake System Relay
E - Auto Shutdown Relay
F - Air Conditioning Clutch Relay
G - Horn Relay
H - Fuel System Relay
J - ABS Warning Light Relay
K - Fog Lamp 2 Relay
L - Fog Lamp 1 Relay
1 - 30 Amp (Pink)
Engine Control
2 - 40 Amp (Green)
Ignition Run/Accessory
3 - 40 Amp (Green)
Ignition Run
4 - 50 Amp (Red)
Instrument Panel, Horn, Parking Lights
5 - 20 Amp (Blue)
Fuel Pump
6 - 30 Amp (Pink)
Trailer Lights
7 - 40 Amp (Green)
Stop/Headlight
8 - 40 Amp (Green)
ABS Pump
9 - 20 Amp (Yellow)
Hazard Lights
10 - 20 Amp (Yellow)
Horn/AC
11 - 15 Amp (Blue)


MIR RO RS - P O W ER

1999 D odge P ic ku p R 1500
1999 ACCESSORIES & EQUIPMENT
CHRY - Power Mirrors
Caravan, Dakota, Durango, Ram Pickup, Ram Van, Ram Wagon,
Town & Country, & Voyager
DESCRIPTION
Outside power rear view mirrors consist of door-mounted
mirrors with internal motor drive and backing plate. On Caravan, Town
& Country, and Voyager, mirrors are controlled by a rocker switch for
left or right mirror selection and a platform button for up, down,
right and left movement. On Dakota, Durango, Ram Pickup, Ram Van and
Ram Wagon, mirrors are controlled by a single, multifunction,
joystick-type switch assembly. On all models, mirror motors are
integral with mirror assemblies and cannot be serviced separately. On
Dakota and Durango, fold-away rear view mirrors are optional.
Dakota, Durango and Ram Pickup are equipped with an automatic
dimming day/night inside mirror. The mirror uses 2 photocell sensors
to monitor ambient and rear facing light levels. The mirror
automatically adjusts its reflectance to reduce headlight glare from
vehicles approaching from the rear. The mirror is controlled by an
off/on switch located on the mirror bottom.
Caravan, Ram Pickup, Town & Country and Voyager have optional
heated outside mirrors. On Caravan, Town & Country and Voyager, heated
mirror is activated whenever the rear defogger is on. On Ram Pickup,
heated mirror is activated by switch in dash. A timer turns off mirror
heater after about 10 minutes.
COMPONENT TESTS
AUTOMATIC DAY/NIGHT INSIDE MIRROR
1) Turn ignition switch to ON position with transmission in
Neutral or Park. Place mirror switch in ON position (switch LED
illuminated). Cover forward facing sensor with a dark cloth or tape to
exclude any ambient light. See Fig. 1.
2) Shine a light into rear-facing sensor. Observe whether or
not mirror darkens. With mirror darkened, place transmission in
Reverse. Mirror should return to normal. If conditions of steps 1) and
2) are met, mirror is operating correctly. If conditions are not met,
go to next step.
3) Turn ignition on. Check for battery voltage at fuse No. 11
in junction block. If battery voltage exists on both sides of fuse, go
to next step. If battery voltage does not exist, repair circuit to
junction block. See WIRING DIAGRAMS. If fuse is blown, repair short
circuit and replace fuse.
4) Check for battery voltage at day/night mirror wire
connector terminal No. 1 (Dark Blue/White wire). If battery voltage
exists, go to next step. If battery voltage does not exist, repair
open circuit between mirror and junction block.
5) Check for continuity between ground and day/night mirror
wire connector terminal No. 2 (Black wire). If continuity exists, go
to next step. If continuity does not exist, repair open ground
circuit.
6) Check for battery voltage at day/night mirror wire
connector terminal No. 3 (Violet/Black wire) with transmission in
Reverse. If battery voltage exists, replace mirror. If battery voltage
does not exist, check back-up light circuit. See WIRING DIAGRAMS.

2) Apply voltage to Light Blue/Yellow wire at heated mirror
and ground Black wire at heated mirror. Mirror should become warm to
touch. If mirror is not warm to touch, remove mirror and test wires
for continuity. If no continuity exists, repair wires. If wires are
okay, replace mirror. To test defogger switch, see appropriate wiring
diagram in REAR WINDOW DEFOGGERS article.
NOTE: On Ram Pickup, heated mirror is controlled by mirror defogger
switch.
Ram Pickup
1) Turn ignition on. While watching instrument panel
voltmeter, turn heated mirror switch on. Voltmeter needle should
deflect. With heated mirror on, mirror should be warm to touch after
3-4 minutes. If system operates as described, system is okay at this
time.
2) If system does not operate as described, go to next step.
Illuminated indicator light means only that voltage exists at heated
mirror relay.
3) Ensure ignition is on. Check fuses in Power Distribution
Center (PDC) and junction block. Ensure fuses are fully seated and
connections are secure. If mirrors are still inoperative, problem is
in heated mirror control, mirror heating grid and/or heated mirror
harness or connectors. If turning switch on causes a large deflection
in instrument panel voltmeter, check for a short circuit in system.
Repair as necessary.
REMOVAL & INSTALLATION
CAUTION: When battery is disconnected, vehicle computer and memory
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.
HEATED MIRROR SWITCH
Removal & Installation (Ram Pickup)
Heated mirror switch is part of HVAC control unit. See
appropriate AUTOMATIC A/C-HEATER SYSTEMS article in appropriate AIR
CONDITIONING & HEATING SERVICE & REPAIR section.
POWER MIRROR SWITCH
Removal & Installation (Caravan, Town & Country, & Voyager)
1) Remove cover from over steering column. Remove screws
holding instrument cluster bezel to dash (above cluster lens). Remove
screws holding instrument cluster bezel to dash from each side of
steering column. Disconnect clip holding instrument cluster bezel to
dash from above right vent louver.
2) Separate instrument cluster bezel from dash. Disconnect
wires from back of bezel. Disengage lock tabs above and below mirror
switch. Pull mirror switch from headlight switch bezel. To install,
reverse removal procedure.
Removal & Installation (Dakota & Durango)
1) Pull power mirror switch control knob rearward to remove
it from switch body. Remove nut securing switch to door trim panel.
Pull door latch handle to open position and remove screw securing trim
panel to door. Remove manual window crank handle, if equipped. Release
locking tab on power window/lock switch, if equipped. Remove power
window/lock switch and unplug connector.

PA R ASIT IC L O AD E XPLA N ATIO N & T E ST P R O CED URES

1999 D odge P ic ku p R 1500
GENERAL INFORMATION
Parasitic Load Explanation & Test Procedures
* PLEASE READ THIS FIRST *
This article is provided for general information only. Not
all procedures apply to all makes and models.
GENERAL INFORMATION
The term Parasitic Load refers to electrical devices that
continue to use or draw current after the ignition switch is turned to
OFF position. This small amount of continuous battery draw is
expressed in milliamps (mA). On Ford Motor Co. and General Motors
vehicles produced after 1980, a typical Parasitic Load should be no
more than 50 milliamps (0.050 amps).
Vehicles produced since 1980 have memory devices that draw
current with ignition off for as long as 20 minutes before shutting
down the Parasitic Drain. When Parasitic Load exceeds normal
specifications, the vehicle may exhibit dead battery and no-start
condition.
Follow test procedure for checking Parasitic Loads to
completion. A brief overview of a suggested test procedure is included
along with some typical Parasitic Load specifications. Refer to the
GENERAL MOTORS PARASITIC LOAD TABLE chart.
TESTING FOR PARASITIC LOAD
INTRODUCTION
CAUTION: Always turn ignition off when connecting or disconnecting
battery cables, battery chargers or jumper cables. DO NOT
turn test switch to OFF position (which causes current to run
through ammeter or vehicle electrical system).
NOTE: Memory functions of various accessories must be reset after
the battery is reconnected.
The battery circuit must be opened to connect test switch
(shunt) and ammeter into the circuit. When a battery cable is removed,\
timer circuits within the vehicle computer are interrupted and
immediately begin to discharge. If in doubt about the condition of the
ammeter fuse, test it with an ohmmeter prior to beginning test. An
open fuse will show the same reading (00.00) as no parasitic drain.
Begin test sequence with the meter installed and on the 10-amp scale.
Select lower scale to read parasitic draw.
TEST PROCEDURE USING TEST SWITCH
1) Turn ignition off. Remove negative battery terminal cable.
Install Disconnect Tool (J-38758) test switch male end to negative
battery cable. Turn test switch knob to OFF position (current through
meter). Install negative battery cable to the female end of test
switch.
2) Turn test switch knob to ON position (current through
switch). Road test vehicle with vehicle accessories on (radio, air
conditioner, etc.). After road test, turn ignition switch to LOCKED
position and remove key. Connect ammeter terminals to test switch

Normal Maximum Time-Out
Component Draw Draw (Minutes)
Anti-Theft System ................ 0.4 .... 1.0 ....... ...
Auto Door Lock ................... 1.0 .... 1.0 ....... ...
Body Control Module .............. 3.6 ... 12.4 ........ 20
Central Processing System ........ 1.6 .... 2.7 ........ 20
Electronic Control Module ........ 5.6 ... 10.0 ....... ...
Electronic Level Control ......... 2.0 .... 3.3 ........ 20
Heated Windshield Module ......... 0.3 .... 0.4 ....... ...
HVAC Power Module ................ 1.0 .... 1.0 ....... ...
Illuminated Entry ................ 1.0 .... 1.0 ......... 1
Light Control Module ............. 0.5 .... 1.0 ....... ...
Oil Level Module ................. 0.1 .... 0.1 ....... ...
Multi-Function Chime ............. 1.0 .... 1.0 ....... ...
Pass Key Decoder Module ......... 0.75 .... 1.0 ....... ...
Power Control Module ............. 5.0 .... 7.0 ....... ...
Retained Accessory Power ......... 3.8 .... 3.8 ....... ...
Radio ............................ 7.0 .... 8.0 ........ 15
Twilight Sentinel Module ......... 1.0 .... 1.0 ....... ...
Voltage Regulator ................ 1.4 .... 2.0 ....... ...









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INTERMITTENT PARASITIC LOAD PROBLEMS
Intermittent parasitic lad can occur because of a memory
device that does not power down with ignition off. With an
intermittent parasitic load, battery draw can be greater than 1.0 amp.
To find and intermittent problem requires that an ammeter and
Disconnect Tool (J-38758) test switch be connected and left in the
circuit. See Fig. 1. Road test vehicle. After road test, turn ignition
off and remove key.
Monitor the milliamps scale for 15-20 minutes after ignition
is turned off. This allows monitoring memory devices to determine if
they time out and stop drawing memory current. The test switch is
needed to protect ammeter when the vehicles is started.
DIODE CHECK & SOLENOID TEST (GENERAL MOTORS)

Removal (A/T Models)
Raise and support vehicle. Disconnect electrical connector
from park/neutral switch. Park/neutral switch is located on side of
transmission case, near shift linkage. Unscrew park/neutral switch
from transmission case. Remove seal ring from park/neutral switch.
Installation
1) Apply parking brake. Place shift lever in Park and
Neutral. Ensure park/neutral switch operating levers in transmission
are centered in the park/neutral switch opening on transmission case.
2) Using NEW seal ring, install park/neutral switch. Tighten
park/neutral switch to specification. See TORQUE SPECIFICATIONS.
Install electrical connector. Add ATF as necessary.
ACCELERATOR PEDAL POSITION SENSOR (APPS)
NOTE: APPS is replaced as assembly, including lever, brackets, and
sensor.
Removal
1) Disconnect negative battery cables. Remove cable cover.
Using finger pressure only, disconnect end of speed control servo
cable from throttle lever pin by pulling forward on connector while
holding lever rearward. Using 2 small screwdrivers, pry throttle cable
connector socket from throttle lever ball.
2) Disconnect transmission kickdown cable (if equipped).
Compress pinch tabs on cruise control and throttle cables. Pull cables
rearward to remove from cable mounting brackets. See Fig. 4.
Disconnect electrical connector and retaining bolts. Remove APPS
sensor.
Installation
To install, reverse removal procedure. To calibrate ECM, turn
ignition on. Without starting engine, slowly press throttle pedal to
floor and then slowly release.
Fig. 4: Locating Throttle Position (TP) Sensor
Courtesy of Chrysler Corp.
RELAYS & SOLENOIDS

FUEL LINE BLEEDING
NOTE: Fuel line bleeding is necessary if fuel injection pump is
replaced, fuel filter/water separator is not filled with
diesel fuel before installing or vehicle ran out off fuel.
Bleed high-pressure fuel lines if connections are loosened or
replaced. If engine has not been operated for an extended
time, bleed fuel lines before next initial engine start-up.
WARNING: DO NOT bleed fuel lines on a hot engine, as high exhaust
temperatures may cause a fire. Carefully bleed fuel lines, as
fuel is under extremely high pressure and could penetrate
skin. Use safety goggles and protective clothing when
bleeding fuel lines.
1) Loosen banjo bolt holding low-pressure fuel supply line to
side of fuel injection pump. Wrap a towel around banjo fitting to
catch fuel. Crank engine quickly and release key before engine starts.
This will operate fuel transfer pump for about 25 seconds.
2) If fuel is not present at fuel supply line after 25
seconds, turn ignition off. Repeat engine crank procedure until fuel
is present at fuel supply line. Tighten banjo bolt at fuel supply line
to specification. See TORQUE SPECIFICATIONS.
CAUTION: Ensure parking brake is applied and transmission is in
Neutral before bleeding fuel injection pump or high-pressure
fuel lines. DO NOT operate starter for more than 30 seconds
when bleeding fuel injection pump or high-pressure fuel
lines. Allow 2-minute intervals between starter operations.
3) To bleed air from fuel injection pump, ensure parking
brake is applied and transmission is in Neutral, as engine may start
when operating starter to bleed air from fuel injection pump. Operate
starter for 30 seconds to bleed any trapped air in fuel injection
pump.
4) To bleed high-pressure fuel lines, ensure parking brake is
applied and transmission is in Neutral, as engine may start when
operating starter to bleed high-pressure fuel lines. Loosen high-
pressure fuel line nut at fuel injector.
5) Operate starter until steady fuel flow exists at high-
pressure fuel line. Tighten high-pressure fuel line nut to
specification. See TORQUE SPECIFICATIONS. Start engine. Repeat
procedure on each high-pressure fuel line until engine operates
smoothly.
FUEL FILTER/WATER SEPARATOR & WATER-IN-FUEL SENSOR
NOTE: Vehicle also contains an in-tank fuel filter located on
bottom of fuel tank module. For servicing procedure, see FUEL
TANK MODULE & IN-TANK FUEL FILTER under FUEL SYSTEM.
NOTE: When fuel filter/water separator is being replaced,
manufacturer recommends cleaning the pre-filter. See FUEL
HEATER under FUEL SYSTEM for servicing of pre-filter.
Removal
1) Ensure engine is off. Place drain pan below drain tube at
fuel filter/water separator. See Fig. 3. Rotate handle on drain valve
forward, toward front of vehicle to DRAIN position. Drain valve is
located near top of fuel filter/water separator. See Fig. 3. Once fuel
is drained from fuel filter/water separator, rotate handle on drain
valve back to CLOSE position.

Procedure For Programming PCM & Clearing DTCs From ABS & SRS
Modules
Connect scan tool to Data Link Connector (DLC). DLC is
located under left side of instrument panel. Using scan tool, enter
correct VIN and mileage into PCM. Using scan tool manufacturer's
instructions, clear DTCs from ABS and SRS modules.
Procedure For Updating Secret Key Data
1) Connect scan tool to Data Link Connector (DLC). DLC is
located under left side of instrument panel.
2) Go to ENGINE and then MISC menus on scan tool. Place the
SKIM in SECURED ACCESS MODE by using the appropriate Personal
Identification Number (PIN) for this vehicle. PIN may be obtained from\
the owner, vehicle's invoice, or from the manufacturer. Select UPDATE
THE SECRET KEY DATA. The data will be transferred from Smart Key
Immobilizer Module (SKIM) to the PCM, allowing the vehicle to start.
NOTE: On Ram Van and Ram Wagon, if 3 attempts are made to enter the
SECURED ACCESS MODE using the incorrect Personal
Identification Number (PIN), the SECURED ACCESS MODE will be
locked out for one hour. To exit this locked out mode, leave
ignition switch in the ON position for one hour with all
accessories turned off. It may be necessary to monitor
battery state and connect a battery charger if necessary.
ENGINE SENSORS & SWITCHES
BATTERY TEMPERATURE SENSOR
Removal & Installation
Battery temperature sensor is snapped into center of battery
tray, directly below the battery. Remove battery. Disconnect
electrical connector for battery temperature sensor. Pry battery
temperature sensor straight upward from battery tray. To install,
reverse removal procedure.
BRAKE SWITCH
NOTE: Brake switch may also be referred to as brakelight switch or
stoplight switch.
Removal (Dakota, Durango & Ram Pickup)
1) Brake switch is located near top of brake pedal. Remove
lower instrument panel cover for access to brake switch if necessary.
Disconnect electrical connector from brake switch. Depress and hold
brake pedal downward.
2) Rotate brake switch counterclockwise approximately 30
degrees so alignment tab on brake switch aligns with opening on
mounting bracket. Pull brake switch rearward from mounting bracket.
NOTE: Before installing brake switch, plunger on brake switch must
be pulled outward to fully extended position and then pushed
inward 4 detent positions to ensure proper brake switch
adjustment.
Installation
1) Pull plunger on brake switch outward to the fully extended
position. Push plunger on brake switch inward 4 detent positions. The
brake switch will click at each detent position when pushing plunger
inward.
2) Install electrical connector on brake switch. Depress
brake pedal as far as possible. Install brake switch in mounting

bracket. Ensure alignment tab on brake switch aligns with opening on
mounting bracket.
CAUTION: When adjusting brake switch, DO NOT pull brake pedal back
toward brake switch with excessive pressure, or brake switch
may be damaged.
3) When brake switch is fully installed in mounting bracket,
rotate brake switch clockwise approximately 30 degrees. To ensure
proper brake switch adjustment, gently pull brake pedal back toward
brake switch as far as possible. DO NOT apply excessive pressure on
brake pedal and brake switch.
Removal (Ram Van & Ram Wagon)
1) Brake switch is located near top of brake pedal. Remove
lower steering column cover. Remove data link connector, hood release
lever and parking brake lever from lower instrument panel cover.
2) Remove lower instrument panel cover for access to brake
switch. Depress and hold brake pedal downward. Rotate brake switch
counterclockwise approximately 1/16 turn to so locking collar on brake
switch aligns with opening on mounting bracket. Pull brake switch
rearward from mounting bracket. Disconnect electrical connector from
brake switch.
NOTE: Before installing brake switch, plunger on brake switch must
be pulled outward to fully extended position and then pushed
inward 4 detent positions to ensure proper brake switch
adjustment.
Installation
1) Pull plunger on brake switch outward to the fully extended
position. Push plunger on brake switch inward 4 detent positions. The
brake switch will click at each detent position when pushing plunger
inward.
2) Install electrical connector on brake switch. Depress
brake pedal as far as possible. Install brake switch in mounting
bracket. Ensure locking collar on brake switch aligns with opening on
mounting bracket.
CAUTION: When adjusting brake switch, DO NOT pull brake pedal back
toward brake switch with excessive pressure, or brake switch
may be damaged.
3) When brake switch is fully installed in mounting bracket,
rotate brake switch clockwise approximately 1/16 turn. To ensure
proper brake switch adjustment, gently pull brake pedal back toward
brake switch as far as possible. DO NOT apply excessive pressure on
brake pedal and brake switch.
CAMSHAFT POSITION SENSOR
Removal & Installation
See CAMSHAFT POSITION SENSOR under IGNITION SYSTEM.
CRANKSHAFT POSITION SENSOR
Removal & Installation
See CRANKSHAFT POSITION SENSOR under IGNITION SYSTEM.
DOWNSTREAM OXYGEN SENSOR
NOTE: Downstream oxygen sensor may also be referred to as post
-catalyst oxygen sensor.

POWER DISTRIBUTION CENTER (PDC) LOCATION








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Application Location
Dakota & Durango .............. Driver's Side Of Engine Compartment,
Behind Battery
Ram Pickup .................... Driver's Side Of Engine Compartment,
Above Wheelwell
Ram Van & Ram Wagon ........... Driver's Side Of Engine Compartment,
Near Battery









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STARTER RELAY & TRANSMISSION RELAY
NOTE: Transmission relay may also be referred to as transmission
control relay.
Removal & Installation
Relay is located in Power Distribution Center (PDC). Relays
may be identified by label on inside of PDC cover. See POWER
DISTRIBUTION CENTER (PDC) LOCATION table.
EVAP PURGE SOLENOID
NOTE: EVAP purge solenoid may also be referred to as EVAP canister
purge solenoid, duty cycle solenoid or proportional purge
solenoid.
Removal & Installation
See EVAP PURGE SOLENOID under EMISSION SYSTEMS.
TRANSMISSION GOVERNOR PRESSURE SOLENOID
NOTE: Transmission governor pressure solenoid may also be referred
to as governor pressure solenoid.
Removal & Installation (A/T Models)
Transmission governor pressure solenoid is located on
transmission valve body. See appropriate ELECTRONIC CONTROLS article
in AUTOMATIC TRANSMISSIONS section.
TRANSMISSION OVERDRIVE SOLENOID & TRANSMISSION TORQUE
CONVERTER CLUTCH (TCC) SOLENOID
NOTE: Transmission overdrive solenoid may also be referred to as
overdrive solenoid or 3-4 shift solenoid.
Removal & Installation (A/T Models)
Transmission overdrive solenoid and TCC solenoid are located
in solenoid assembly on transmission valve body. See appropriate
ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS section.
IGNITION SYSTEM
CAMSHAFT POSITION SENSOR
Removal & Installation (Dakota, Durango, Ram Pickup 3.9L,
5.2L & 5.9L, Ram Van & Ram Wagon)
1) Camshaft position sensor is located in the distributor.
See Fig. 13 . Camshaft position sensor may be serviced without removing