wiring diagram window DODGE RAM 1500 1998 2.G Workshop Manual

DIAGNOSIS AND TESTING - REAR WINDOW
DEFOGGER SYSTEM
For circuit descriptions and diagrams, refer to Rear
Window Defogger in Wiring Diagrams. The operation
of the electrically heated rear window defogger sys-
tem can be confirmed in one of the following man-
ners:
1. Turn the ignition switch to the On position.
While monitoring the instrument panel voltmeter, set
the defogger switch in the On position. When the
defogger switch is turned On, a distinct voltmeter
needle deflection should be noted.
2. Turn the ignition switch to the On position. Set
the defogger switch in the On position. The rear win-
dow defogger operation can be checked by feeling the
rear window or outside rear view mirror glass. A dis-
tinct difference in temperature between the grid lines
and the adjacent clear glass or the mirror glass can
be detected within three to four minutes of operation.
3. Using a 12-volt DC voltmeter, contact the rear
glass heating grid terminal A (right side) with the
negative lead, and terminal B (left side) with the pos-
itive lead (Fig. 1). The voltmeter should read battery
voltage.
The above checks will confirm system operation.
Illumination of the defogger switch indicator lamp
means that there is electrical current available at the
output of the rear window defogger logic and timer
circuitry, but does not confirm that the electrical cur-
rent is reaching the rear glass heating grid lines.
If the defogger system does not operate, the prob-
lem should be isolated in the following manner:(1) Confirm that the ignition switch is in the On
position.
(2) Make sure that the rear glass heating grid feed
and ground wires are connected to the glass. Confirm
that the ground wire has continuity to ground.
(3) Check the fuses in the power distribution cen-
ter (PDC) and in the junction block. The fuses must
be tight in their receptacles and all electrical connec-
tions must be secure.
When the above steps have been completed and the
rear glass heating grid is still inoperative, one or
more of the following could be faulty:
²Rear window switch in the A/C-heater control..
²Rear window grid lines (all grid lines would
have to be broken or one of the feed wires discon-
nected for the entire system to be inoperative).
If setting the defogger switch to the On position
produces a severe voltmeter deflection, check for a
short circuit between the rear window switch defog-
ger relay output and the rear glass heating grid.
REAR WINDOW DEFOGGER
RELAY
DESCRIPTION
The rear window defogger relay (Fig. 2) is a Inter-
national Standards Organization (ISO) micro-relay.
Relays conforming to the ISO specifications have
common physical dimensions, current capacities, ter-
minal patterns, and terminal functions. The ISO
micro-relay terminal functions are the same as a con-
ventional ISO relay. However, the ISO micro-relay
terminal pattern (or footprint) is different, the cur-
rent capacity is lower, and the physical dimensions
are smaller than those of the conventional ISO relay.
The rear window defogger relay is located in the
power distribution center (PDC) in the engine com-
partment. Refer to the PDC label for rear window
defogger relay identification and location.
The black, molded plastic case is the most visible
component of the rear window defogger relay. Five
male spade-type terminals extend from the bottom of
the base to connect the relay to the vehicle electrical
system, and the ISO designation for each terminal is
molded into the base adjacent to each terminal. The
ISO terminal designations are as follows:
²30 (Common Feed)- This terminal is con-
nected to the movable contact point of the relay.
²85 (Coil Ground)- This terminal is connected
to the ground feed side of the relay control coil.
²86 (Coil Battery)- This terminal is connected
to the battery feed side of the relay control coil.
²87 (Normally Open)- This terminal is con-
nected to the normally open fixed contact point of the
relay.
Fig. 1 Grid Line Test - Typical
1 - VIEW FROM INSIDE VEHICLE
2 - REAR WINDOW DEFOGGER
3 - BUS BARS
4 - VOLTAGE FEED (A)
5 - VOLTMETER
6 - MID-POINT (C)
7 - PICK-UP LEADS
8 - GROUND (B)
8G - 2 HEATED GLASSDR
HEATED GLASS (Continued)

²87A (Normally Closed)- This terminal is con-
nected to the normally closed fixed contact point of
the relay.
The rear window defogger relay cannot be adjusted
or repaired. If the relay is damaged or faulty, it must
be replaced.
OPERATION
The rear window defogger relay is an electrome-
chanical switch that uses a low current input from
the integrated power module (IPM) to control the
high current output to the rear window defogger
grid. The movable common feed contact point is held
against the fixed normally closed contact point by
spring pressure. When the relay coil is energized, an
electromagnetic field is produced by the coil wind-
ings. This electromagnetic field draws the movable
relay contact point away from the fixed normally
closed contact point, and holds it against the fixed
normally open contact point. When the relay coil is
de-energized, spring pressure returns the movable
contact point back against the fixed normally closed
contact point. The resistor or diode is connected in
parallel with the relay coil in the relay, and helps to
dissipate voltage spikes and electromagnetic interfer-
ence that can be generated as the electromagnetic
field of the relay coil collapses.
The rear window defogger relay terminals are con-
nected to the vehicle electrical system through a
receptacle in the IPM. The inputs and outputs of the
rear window defogger relay include:
²The common feed terminal (30) receives a bat-
tery current input from fuse 27 (15 amp) in the IPM
through a fused B(+) circuit at all times.²The coil ground terminal (87) receives a ground
input from the A/C-heater control when the A/C-
heater control electronically pulls the control circuit
to ground.
²The coil battery terminal (85) receives a battery
current input from fuse 36 (10 amp) in the IPM
through a fused B(+) circuit only when the ignition
switch is in the Run position.
²The normally open terminal (86) provides a bat-
tery current output to the rear window defogger and
heated power mirrors (when equipped) through the
relay output circuit only when the rear window
defogger relay coil is energized.
²The normally closed terminal (87A) is not con-
nected to any circuit in this application, but provides
a battery current output only when the rear window
defogger relay coil is de-energized.
The rear window defogger relay cannot be repaired
and, if faulty or damaged, it must be replaced. Refer
to the appropriate wiring information for diagnosis
and testing of the micro-relay and for complete rear
window defogger system wiring diagrams.
REMOVAL
(1)Disconnect and isolate the negative battery cable.
(2) Remove the cover from the integrated power
module (IPM) (Fig. 3).
(3) Refer to the fuse and relay layout map on the
inner surface of the IPM cover for rear window defog-
ger relay identification and location.
(4) Remove the rear window defogger relay from
the IPM.
Fig. 2 Rear Window Defogger Relay
1 - RELAY TERMINALS
2 - RELAY CAVITIES
Fig. 3 Integrated Power Module (IPM)
1 - BATTERY
2 - INTEGRATED POWER MODULE (IPM)
DRHEATED GLASS 8G - 3
REAR WINDOW DEFOGGER RELAY (Continued)

(2) Disconnect wire harness connector to power
mirror switch (Fig. 1).
(3) Using two jumper wires:
²Connect one to a 12 volt source
²Connect the other to a good body ground
²Refer to the Mirror Motor Test Chart for proper
wire connections at the switch connector
MIRROR MOTOR TEST CHART
12 VOLTS GROUND MIRROR REACTION
SWITCH CONNECTOR RIGHT LEFT
PIN 1 PIN 2 - UP
PIN 6 PIN 2 - LEFT
PIN 2 PIN 1 - DOWN
PIN 2 PIN 6 - RIGHT
PIN 7 PIN 2 UP -
PIN 4 PIN 2 LEFT -
PIN 2 PIN 7 DOWN -
PIN 2 PIN 4 RIGHT -
(4) If results shown in table are not obtained,
check for open or shorted circuit. Replace mirror
assembly as necessary.
AUTOMATIC DAY / NIGHT
MIRROR
DESCRIPTION
The automatic day/night mirror uses a thin layer
of electrochromic material between two pieces of con-
ductive glass to make up the face of the mirror.
When the mirror switch is in the On position, two
photocell sensors are used by the mirror circuitry to
monitor external light levels and adjust the reflec-
tance of the mirror.
OPERATION
The ambient photocell sensor is located on the for-
ward-facing (windshield side) of the rear view mirror
housing, and detects the ambient light levels outside
of the vehicle. The headlamp photocell sensor is
located inside the rear view mirror housing behind
the mirror glass and faces rearward, to detect the
level of the light being received at the rear window
side of the mirror. When the circuitry of the auto-
matic day/night mirror detects that the difference
between the two light levels is too great (the light
level received at the rear of the mirror is much
higher than that at the front of the mirror), it begins
to darken the mirror.
The automatic day/night mirror circuitry also mon-
itors the transmission using an input from the
backup lamp circuit. The mirror circuitry is pro-
grammed to automatically disable its self-dimming
feature whenever it senses that the transmission
backup lamp circuit is energized.
The automatic day/night mirror is a completely
self-contained unit and cannot be repaired. If faulty
or damaged, the entire mirror assembly must be
replaced.
DIAGNOSIS AND TESTING - AUTOMATIC DAY /
NIGHT MIRROR
For complete circuit diagrams, refer to the appro-
priate wiring information.
(1) Check the fuse in the Integrated Power Module
(IPM). If OK, go to Step 2. If not OK, repair the
shorted circuit or component as required and replace
the faulty fuse.
(2) Turn the ignition switch to the On position.
Check for battery voltage at the fuse in the IPM. If
OK, go to Step 3. If not OK, repair the open circuit to
the ignition switch as required.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the wire harness connector from the auto-
matic day/night mirror (Fig. 2). Connect the battery
negative cable. Turn the ignition switch to the On
position. Check for battery voltage at the fused igni-
tion switch output (run/start) circuit cavity of the
automatic day/night mirror wire harness connector. If
OK, go to Step 4. If not OK, repair the open circuit to
the IPM as required.
(4) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Check for continuity between the ground circuit cav-
ity of the automatic day/night mirror wire harness
connector and a good ground. There should be conti-
nuity. If OK, go to Step 5. If not OK, repair the cir-
cuit to ground as required.
Fig. 1 POWER MIRROR SWITCH CONNECTOR
DRPOWER MIRRORS 8N - 11
POWER MIRRORS (Continued)

WIRING
TABLE OF CONTENTS
page page
WIRING DIAGRAM INFORMATION....... 8W-01-1
COMPONENT INDEX.................. 8W-02-1
POWER DISTRIBUTION............... 8W-10-1
GROUND DISTRIBUTION.............. 8W-15-1
BUS COMMUNICATIONS.............. 8W-18-1
CHARGING SYSTEM.................. 8W-20-1
STARTING SYSTEM.................. 8W-21-1
FUEL/IGNITION SYSTEM.............. 8W-30-1
TRANSMISSION CONTROL SYSTEM..... 8W-31-1
VEHICLE SPEED CONTROL............ 8W-33-1
REAR WHEEL ANTILOCK BRAKES....... 8W-34-1
ALL WHEEL ANTILOCK BRAKES........ 8W-35-1
VEHICLE THEFT SECURITY SYSTEM..... 8W-39-1
INSTRUMENT CLUSTER............... 8W-40-1
HORN/CIGAR LIGHTER/POWER OUTLET . . 8W-41-1
AIR CONDITIONING.................. 8W-42-1
AIRBAG SYSTEM.................... 8W-43-1
INTERIOR LIGHTING.................. 8W-44-1AUDIO SYSTEM..................... 8W-47-1
REAR WINDOW DEFOGGER............ 8W-48-1
OVERHEAD CONSOLE................. 8W-49-1
FRONT LIGHTING.................... 8W-50-1
REAR LIGHTING..................... 8W-51-1
TURN SIGNALS...................... 8W-52-1
WIPERS............................ 8W-53-1
TRAILER TOW....................... 8W-54-1
NAVIGATION/TELECOMMUNICATION..... 8W-55-1
POWER WINDOWS................... 8W-60-1
POWER DOOR LOCKS................ 8W-61-1
POWER MIRRORS................... 8W-62-1
POWER SEATS...................... 8W-63-1
SPLICE INFORMATION................ 8W-70-1
CONNECTOR PIN-OUTS............... 8W-80-1
CONNECTOR/GROUND/SPLICE
LOCATION........................ 8W-91-1
POWER DISTRIBUTION............... 8W-97-1 DRWIRING 8W - 1

After the system has been tested for leaks and
evacuated, a refrigerant (R-134a) charge can be
injected into the system.
NOTE: When connecting the service equipment
coupling to the line fitting, verify that the valve of
the coupling is fully closed. This will reduce the
amount of effort required to make the connection.
(1) If using a separate vacuum pump close all
valves before disconnecting pump. Connect manifold
gauge set to the A/C service ports.
NOTE: Always refer to the underhood HVAC Speci-
fication label for the refrigerant fill level of the vehi-
cle being serviced.
(2) Measure refrigerant (refer to capacities). Refer
to the instructions provided with the equipment
being used.
(3) Verify engine is shut off. Open the suction and
discharge valves. Open the charge valve to allow the
refrigerant to flow into the system. When the trans-
fer of refrigerant has stopped, close the suction and
discharge valve.
(4) If all of the charge did not transfer from the
dispensing device, put vehicle controls into the fol-
lowing mode:
²Automatic transmission in park or manual
transmission in neutral
²Engine at idle
²A/C mode control set to outside air
²A/C mode control set to panel mode
²A/C temperature control set to full cool
²Blower motor control set on highest speed
²Vehicle windows closed
If the A/C compressor does not engage, test the
compressor clutch control circuit and correct any fail-
ure (Refer to 8 - ELECTRICAL/WIRING DIAGRAM
INFORMATION - DIAGNOSIS AND TESTING).
(5) Open the suction valve to allow the remaining
refrigerant to transfer to the system.
WARNING: TAKE CARE NOT TO OPEN THE DIS-
CHARGE (HIGH-PRESSURE) VALVE AT THIS TIME.
(6) Close all valves and test the A/C system perfor-
mance.
(7) Disconnect the charging station or manifold
gauge set. Install the service port caps.
REFRIGERANT CHARGE CAPACITY
The R-134a refrigerant system charge capacity for
this vehicle can be found on the underhood HVAC
specfication tag.
A/C COMPRESSOR
DESCRIPTION
DESCRIPTION - A/C COMPRESSOR
The A/C system on models equipped with the 5.9L
engine use a Sanden SD-7 reciprocating swash plate-
type compressor. This compressor has a fixed dis-
placement of 165 cubic centimeter (10.068 cubic
inches) and has both the suction and discharge ports
located on the cylinder head.
The A/C system on models equipped with the 3.7L,
4.7L and 5.7L engines use a Denso 10S17 reciprocat-
ing swash plate-type compressor. This compressor
has a fixed displacement of 170 cubic centimeter and
has both the suction and discharge ports located on
the cylinder head.
A label identifying the use of R-134a refrigerant is
located on both A/C compressors.
DESCRIPTION - HIGH PRESSURE RELIEF
VALVE
A high pressure relief valve is located on the com-
pressor cylinder head, which is on the rear of the
compressor. This mechanical valve is designed to
vent refrigerant from the system to protect against
damage to the compressor and other system compo-
nents, caused by condenser air flow restriction or an
overcharge of refrigerant.
OPERATION
OPERATION - A/C COMPRESSOR
The A/C compressor is driven by the engine
through an electric clutch, drive pulley and belt
arrangement. The compressor is lubricated by refrig-
erant oil that is circulated throughout the refrigerant
system with the refrigerant.
The compressor draws in low-pressure refrigerant
vapor from the evaporator through its suction port. It
then compresses the refrigerant into a high-pressure,
high-temperature refrigerant vapor, which is then
pumped to the condenser through the compressor dis-
charge port.
The compressor cannot be repaired. If faulty or
damaged, the entire compressor assembly must be
replaced. The compressor clutch, pulley and clutch
coil are available for service.
OPERATION - HIGH PRESSURE RELIEF VALVE
The high pressure relief valve vents the system
when a discharge pressure of 3445 to 4135 kPa (500
to 600 psi) or above is reached. The valve closes
24 - 48 PLUMBINGDR
PLUMBING (Continued)

WATER PUMP BYPASS - DESCRIPTION....7-59
WATER PUMP BYPASS - OPERATION......7-60
WATER SEPARATOR - DESCRIPTION,
FUEL FILTER........................14-50
WATER SEPARATOR - INSTALLATION,
FUEL FILTER........................14-50
WATER SEPARATOR - OPERATION, FUEL
FILTER.............................14-50
WATER SEPARATOR - REMOVAL, FUEL
FILTER.............................14-50
WATER TO OIL COOLER - REMOVAL......7-69
WATERDAM - INSTALLATION......23-25,23-34
WATERDAM - REMOVAL..........23-25,23-34
WATER-IN-FUEL INDICATOR -
DESCRIPTION.......................8J-45
WATER-IN-FUEL INDICATOR -
OPERATION.........................8J-45
WATER-TO-AIR COOLER - INSTALLATION . . 7-70
WEAR - STANDARD PROCEDURE,
MEASURING TIMING CHAIN............9-167
WEAR INDICATORS - DIAGNOSIS AND
TESTING, TREAD......................22-8
WEAR PATTERNS - DIAGNOSIS AND
TESTING, TIRE.......................22-8
WEAR, STANDARD PROCEDURE -
MEASURING TIMING CHAIN.............9-77
WEATHERSTRIP - INSTALLATION, DRIP
RAIL..............................23-91
WEATHERSTRIP - INSTALLATION, FRONT
DOOR GLASS RUN...................23-92
WEATHERSTRIP - INSTALLATION, REAR
DOOR GLASS RUN.....................23-93
WEATHERSTRIP - REMOVAL, DRIP RAIL . . 23-91
WEATHERSTRIP - REMOVAL, FRONT
DOOR GLASS RUN...................23-92
WEATHERSTRIP - REMOVAL, REAR
DOOR GLASS RUN...................23-93
WEATHERSTRIP RETAINER -
INSTALLATION, A-PILLAR..............23-91
WEATHERSTRIP RETAINER -
INSTALLATION, DRIP RAIL.............23-92
WEATHERSTRIP RETAINER - REMOVAL,
A-PILLAR...........................23-91
WEATHERSTRIP RETAINER - REMOVAL,
DRIP RAIL..........................23-92
WELD LOCATIONS - SPECIFICATIONS . . . 23-120
WELD PROCESS - SPECIFICATIONS......13-15
WHEEL - INSTALLATION, STEERING
......19-15
WHEEL - REMOVAL, STEERING
.........19-15
WHEEL ALIGNMENT - DESCRIPTION
.......2-1
WHEEL ALIGNMENT - OPERATION
.........2-2
WHEEL ALIGNMENT, SPECIAL TOOLS
......2-7
WHEEL ANTILOCK - DIAGNOSIS AND
TESTING, REAR
.......................5-48
WHEEL BALANCE - STANDARD
PROCEDURE, TIRE
....................22-4
WHEEL COVER - REMOVAL
............22-14WHEEL INSPECTION, DIAGNOSIS AND
TESTING...........................22-11
WHEEL INSTALLATION - STANDARD
PROCEDURE, DUAL REAR.............22-12
WHEEL REPLACEMENT - STANDARD
PROCEDURE........................22-12
WHEEL RUNOUT - DIAGNOSIS AND
TESTING, TIRE.......................22-1
WHEEL SPEED SENSOR - DESCRIPTION,
FRONT..............................5-47
WHEEL SPEED SENSOR - DIAGNOSIS
AND TESTING, REAR...................5-49
WHEEL SPEED SENSOR -
INSTALLATION, FRONT.................5-48
WHEEL SPEED SENSOR -
INSTALLATION, REAR..................5-48
WHEEL SPEED SENSOR - OPERATION,
FRONT..............................5-47
WHEEL SPEED SENSOR - REMOVAL,
FRONT..............................5-48
WHEEL SPEED SENSOR - REMOVAL,
REAR...............................5-48
WHEEL WITH MATCHING TIRE -
DESCRIPTION, FULL SIZE, SPARE.......22-15
WHEELHOUSE SPLASH SHIELD -
INSTALLATION, FRONT................23-41
WHEELHOUSE SPLASH SHIELD -
INSTALLATION, REAR.................23-41
WHEELHOUSE SPLASH SHIELD -
REMOVAL, FRONT....................23-41
WHEELHOUSE SPLASH SHIELD -
REMOVAL, REAR.....................23-41
WHEELS - DESCRIPTION..............22-11
WHEELS - INSTALLATION, REAR DUAL....5-35
WHEELS - OPERATION................22-11
WHEELS - REMOVAL, REAR DUAL........5-34
WIND NOISE - DIAGNOSIS AND TESTING . . 23-2
WINDOW DEFOGGER RELAY -
DESCRIPTION, REAR..................8G-2
WINDOW DEFOGGER RELAY -
INSTALLATION, REAR..................8G-4
WINDOW DEFOGGER RELAY -
OPERATION, REAR....................8G-3
WINDOW DEFOGGER RELAY -
REMOVAL, REAR.....................8G-3
WINDOW DEFOGGER SWITCH -
DESCRIPTION, REAR..................8G-4
WINDOW DEFOGGER SWITCH -
OPERATION, REAR....................8G-4
WINDOW DEFOGGER SYSTEM -
DIAGNOSIS AND TESTING, REAR.........8G-2
WINDOW MOTOR - REMOVAL..........8N-20
WINDOW REGULATOR - MANUAL -
INSTALLATION..................23-27,23-35
WINDOW REGULATOR - MANUAL -
REMOVAL.....................23-26,23-35
WINDOW REGULATOR - POWER -
INSTALLATION..................23-26,23-34WINDOW REGULATOR - POWER -
REMOVAL.....................23-25,23-34
WINDOW SWITCH - DIAGNOSIS AND
TESTING...........................8N-20
WINDOW SWITCH - INSTALLATION......8N-21
WINDOW SWITCH - REMOVAL..........8N-20
WINDOWS - DESCRIPTION, POWER.....8N-19
WINDOWS - DIAGNOSIS AND TESTING,
POWER............................8N-19
WINDOWS - OPERATION, POWER.......8N-19
WINDSHIELD SAFETY PRECAUTIONS,
WARNING..........................23-88
WIPER & WASHER SYSTEM - CLEANING . . 8R-6
WIPER & WASHER SYSTEM -
DIAGNOSIS AND TESTING..............8R-6
WIPER & WASHER SYSTEM -
INSPECTION.........................8R-7
WIPER ARM - DESCRIPTION...........8R-17
WIPER ARM - INSTALLATION...........8R-18
WIPER ARM - OPERATION.............8R-18
WIPER ARM - REMOVAL..............8R-18
WIPER BLADE - DESCRIPTION..........8R-18
WIPER BLADE - INSTALLATION.........8R-20
WIPER BLADE - OPERATION...........8R-19
WIPER BLADE - REMOVAL.............8R-19
WIPER HIGH/LOW RELAY -
DESCRIPTION.......................8R-20
WIPER HIGH/LOW RELAY - DIAGNOSIS
AND TESTING.......................8R-21
WIPER HIGH/LOW RELAY -
INSTALLATION......................8R-22
WIPER HIGH/LOW RELAY - OPERATION . . 8R-20
WIPER HIGH/LOW RELAY - REMOVAL....8R-21
WIPER MODULE - DESCRIPTION........8R-22
WIPER MODULE - INSTALLATION.......8R-23
WIPER MODULE - OPERATION..........8R-23
WIPER MODULE - REMOVAL...........8R-23
WIPER ON/OFF RELAY - DESCRIPTION . . . 8R-24
WIPER ON/OFF RELAY - DIAGNOSIS AND
TESTING...........................8R-25
WIPER ON/OFF RELAY - INSTALLATION . . . 8R-26
WIPER ON/OFF RELAY - OPERATION.....8R-25
WIPER ON/OFF RELAY - REMOVAL......8R-26
WIPERS/WASHERS - DESCRIPTION
.......8R-1
WIPERS/WASHERS - OPERATION
........8R-4
WIRE SPLICING - STANDARD
PROCEDURE
.....................8W-01-15
WIRING - DESCRIPTION, TRAILER TOW
. . 8L-24
WIRING DIAGRAMS - DESCRIPTION,
HOW TO USE
.....................8W-01-1
WIRING HARNESS - DIAGNOSIS AND
TESTING
.........................8W-01-7
WIRING/TERMINAL, SPECIAL TOOLS
. . 8W-01-10
WORN THREADS - STANDARD
PROCEDURE, REPAIR
DAMAGED OR
...........9-190,9-240,9-9,9-94
DRINDEX 37
Description Group-Page Description Group-Page Description Group-Page