cruise control DODGE RAM 1500 1998 2.G User Guide

²Engine Temperature High Message- Each
time the cluster receives a message from the PCM or
ECM indicating the engine coolant temperature of a
gasoline engine is about 122É C (252É F) or higher, or
of a diesel engine is about 112É C (233É F) or higher,
the check gauges indicator will be illuminated. The
indicator remains illuminated until the cluster
receives a message from the PCM or ECM indicating
that the engine coolant temperature of a gasoline
engine is below about 122É C (252É F), or of a diesel
engine is below about 112É C (233É F), or until the
ignition switch is turned to the Off position, which-
ever occurs first.
²Engine Oil Pressure Low Message- Each
time the cluster receives a message from the PCM or
ECM indicating the engine oil pressure is about 41
kPa (6 psi) or lower, the check gauges indicator will
be illuminated. The indicator remains illuminated
until the cluster receives a message from the PCM or
ECM indicating that the engine oil pressure is above
about 41 kPa (6 psi), or until the ignition switch is
turned to the Off position, whichever occurs first.
The cluster will only turn the indicator on in
response to an engine oil pressure low message if the
engine speed is greater than zero.
²System Voltage Low (Charge Fail) Message
- Each time the cluster receives a message from the
PCM or ECM indicating the electrical system voltage
is less than about 11.5 volts (charge fail condition),
the check gauges indicator will be illuminated. The
indicator remains illuminated until the cluster
receives a message from the PCM or ECM indicating
the electrical system voltage is greater than about
12.0 volts (but less than 16.0 volts), or until the igni-
tion switch is turned to the Off position, whichever
occurs first.
²System Voltage High Message- Each time
the cluster receives a message from the PCM or ECM
indicating the electrical system voltage is greater
than about 16.0 volts, the check gauges indicator will
be illuminated. The indicator remains illuminated
until the cluster receives a message from the PCM or
ECM indicating the electrical system voltage is less
than about 15.5 volts (but greater than 11.5 volts), or
until the ignition switch is turned to the Off position,
whichever occurs first.
²Actuator Test- Each time the cluster is put
through the actuator test, the check gauges indicator
will be turned on, then off again during the bulb
check portion of the test to confirm the functionality
of the LED and the cluster control circuitry.
On vehicles with a gasoline engine, the PCM con-
tinually monitors the engine temperature, oil pres-
sure, and electrical system voltage, then sends the
proper messages to the instrument cluster. On vehi-
cles with a diesel engine, the ECM continually mon-itors the engine temperature, oil pressure, and
electrical system voltage, then sends the proper mes-
sages to the instrument cluster. For further diagnosis
of the check gauges indicator or the instrument clus-
ter circuitry that controls the LED, (Refer to 8 -
ELECTRICAL/INSTRUMENT CLUSTER - DIAGNO-
SIS AND TESTING). For proper diagnosis of the
PCM, the ECM, the PCI data bus, or the electronic
message inputs to the instrument cluster that control
the check gauges indicator, a DRBIIItscan tool is
required. Refer to the appropriate diagnostic infor-
mation.
CRUISE INDICATOR
DESCRIPTION
A cruise indicator is standard equipment on all
instrument clusters (Fig. 13). However, on vehicles
not equipped with the optional speed control system,
this indicator is electronically disabled. The cruise
indicator consists of the word ªCRUISEº, which
appears in the lower portion of the gear selector indi-
cator Vacuum-Fluorescent Display (VFD) unit. The
VFD is soldered onto the cluster electronic circuit
board and is visible through a window with a smoked
clear lens located on the lower edge of the speedom-
eter gauge dial face of the cluster overlay. The dark
lens over the VFD prevents the indicator from being
clearly visible when it is not illuminated. The word
ªCRUISEº appears in a blue-green color and at the
same lighting level as the gear selector indicator
information when it is illuminated by the instrument
cluster electronic circuit board. The cruise indicator
is serviced as a unit with the VFD in the instrument
cluster.
OPERATION
The cruise indicator gives an indication to the vehi-
cle operator when the speed control system is turned
On, regardless of whether the speed control is
engaged. This indicator is controlled by the instru-
ment cluster circuit board based upon cluster pro-
gramming and electronic messages received by the
cluster from the Powertrain Control Module (PCM)
over the Programmable Communications Interface
(PCI) data bus. The cruise indicator is completely
controlled by the instrument cluster logic circuit, and
that logic will only allow this indicator to operate
when the instrument cluster receives a battery cur-
rent input on the fused ignition switch output (run-
start) circuit. Therefore, the indicator will always be
Fig. 13 Cruise Indicator
8J - 22 INSTRUMENT CLUSTERDR
CHECK GAUGES INDICATOR (Continued)

off when the ignition switch is in any position except
On or Start. The indicator only illuminates when it is
switched to ground by the instrument cluster cir-
cuitry. The instrument cluster will turn on the cruise
indicator for the following reasons:
²Cruise Lamp-On Message- Each time the
cluster receives a cruise lamp-on message from the
PCM indicating the speed control system has been
turned On, the cruise indicator is illuminated. The
indicator remains illuminated until the cluster
receives a cruise lamp-off message from the PCM or
until the ignition switch is turned to the Off position,
whichever occurs first.
²Actuator Test- Each time the cluster is put
through the actuator test, the cruise indicator will be
turned on, then off again during the VFD portion of
the test to confirm the functionality of the VFD and
the cluster control circuitry.
The PCM continually monitors the speed control
switches to determine the proper outputs to the
speed control servo. The PCM then sends the proper
cruise indicator lamp-on and lamp-off messages to
the instrument cluster. For further diagnosis of the
cruise indicator or the instrument cluster circuitry
that controls the indicator, (Refer to 8 - ELECTRI-
CAL/INSTRUMENT CLUSTER - DIAGNOSIS AND
TESTING). For proper diagnosis of the speed control
system, the PCM, the PCI data bus, or the electronic
message inputs to the instrument cluster that control
the cruise indicator, a DRBIIItscan tool is required.
Refer to the appropriate diagnostic information.
DOOR AJAR INDICATOR
DESCRIPTION
A door ajar indicator is standard equipment on all
instrument clusters (Fig. 14). The door ajar indicator
is located on the right side of the instrument cluster,
to the right of the engine temperature gauge. The
door ajar indicator consists of a stencil-like cutout of
the words ªDOOR AJARº in the opaque layer of the
instrument cluster overlay. The dark outer layer of
the overlay prevents the indicator from being clearly
visible when it is not illuminated. A red Light Emit-
ting Diode (LED) behind the cutout in the opaque
layer of the overlay causes the ªDOOR AJARº text to
appear in red through the translucent outer layer of
the overlay when the indicator is illuminated from
behind by the LED, which is soldered onto the
instrument cluster electronic circuit board. The doorajar indicator is serviced as a unit with the instru-
ment cluster.
OPERATION
The door ajar indicator gives an indication to the
vehicle operator that one or more of the passenger
compartment doors may be open or not completely
latched. This indicator is controlled by a transistor
on the instrument cluster circuit board based upon
cluster programming and hard wired inputs received
by the cluster from the door ajar switches located in
each door latch unit. The door ajar indicator Light
Emitting Diode (LED) is completely controlled by the
instrument cluster logic circuit, and that logic will
allow this indicator to operate whenever the instru-
ment cluster receives a battery current input on the
fused ignition switch output (run-start) circuit.
Therefore, the LED will always be off when the igni-
tion switch is in any position except On or Start. The
LED only illuminates when it is provided a path to
ground by the instrument cluster transistor. The
instrument cluster will turn on the door ajar indica-
tor for the following reasons:
²Bulb Test- Each time the ignition switch is
turned to the On position the door ajar indicator is
illuminated for about two seconds as a bulb test.
²Door Ajar Switch Input- Each time the clus-
ter detects ground on any one of the door ajar switch
sense circuits (door ajar switch closed = door is open
or not completely latched) the door ajar indicator will
be illuminated. The indicator remains illuminated
until all of the door ajar switch sense inputs to the
cluster are an open circuit (door ajar switch open =
door fully closed), or until the ignition switch is
turned to the Off position, whichever occurs first.
²Actuator Test- Each time the cluster is put
through the actuator test, the door ajar indicator will
be turned on, then off again during the bulb check
portion of the test to confirm the functionality of the
LED and the cluster control circuitry.
The instrument cluster continually monitors the
door ajar switches to determine the status of the
doors. For further diagnosis of the door ajar indicator
or the instrument cluster circuitry that controls the
indicator, (Refer to 8 - ELECTRICAL/INSTRUMENT
CLUSTER - DIAGNOSIS AND TESTING). For
proper diagnosis of the door ajar switches and cir-
cuits, (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING
- INTERIOR/DOOR AJAR SWITCH - DIAGNOSIS
AND TESTING).
Fig. 14 Door Ajar Indicator
DRINSTRUMENT CLUSTER 8J - 23
CRUISE INDICATOR (Continued)

IGNITION CIRCUIT SENSE -
DESCRIPTION.......................8E-10
IGNITION CIRCUIT SENSE - OPERATION . . 8E-11
IGNITION COIL - DESCRIPTION..........8I-11
IGNITION COIL - INSTALLATION.........8I-14
IGNITION COIL - OPERATION............8I-12
IGNITION COIL - REMOVAL.............8I-13
IGNITION COIL CAPACITOR -
DESCRIPTION........................8I-21
IGNITION COIL CAPACITOR -
INSTALLATION.......................8I-21
IGNITION COIL CAPACITOR - OPERATION . . 8I-21
IGNITION COIL CAPACITOR - REMOVAL . . . 8I-21
IGNITION COIL RESISTANCE, 3.7L V-6.....8I-5
IGNITION COIL RESISTANCE, 4.7L V-8.....8I-5
IGNITION COIL RESISTANCE, 5.7L V-8.....8I-5
IGNITION CONTROL - DESCRIPTION.......8I-1
IGNITION SWITCH - DESCRIPTION........19-9
IGNITION SWITCH - DESCRIPTION,
KEY-IN.............................19-11
IGNITION SWITCH - DIAGNOSIS AND
TESTING............................19-9
IGNITION SWITCH - INSTALLATION......19-11
IGNITION SWITCH - OPERATION.........19-9
IGNITION SWITCH - REMOVAL..........19-10
IGNITION SWITCH AND KEY LOCK
CYLINDER - DIAGNOSIS AND TESTING . . . 19-11
IGNITION TIMING, SPECIFICATIONS.......8I-5
IGNITION-OFF DRAW TEST - STANDARD
PROCEDURE........................8F-11
IMMOBILIZER MODULE - DESCRIPTION,
SENTRY KEY........................8E-13
IMMOBILIZER MODULE - INSTALLATION,
SENTRY KEY........................8E-15
IMMOBILIZER MODULE - OPERATION,
SENTRY KEY........................8E-13
IMMOBILIZER MODULE - REMOVAL,
SENTRY KEY........................8E-15
IMMOBILIZER MODULE (SKIM) -
DESCRIPTION, SENTRY KEY.............8Q-1
IMMOBILIZER MODULE (SKIM) -
OPERATION, SENTRY KEY..............8Q-2
IMMOBILIZER SYSTEM INDICATOR
LAMP - DESCRIPTION, SENTRY KEY......8Q-5
IMMOBILIZER SYSTEM INDICATOR
LAMP - OPERATION, SENTRY KEY........8Q-5
IMMOBILIZER SYSTEM INITIALIZATION,
STANDARD PROCEDURE - SENTRY
KEY................................8Q-3
IMMOBILIZER SYSTEM (SKIS) -
DESCRIPTION, SENTRY KEY.............8Q-1
IMMOBILIZER SYSTEM (SKIS) -
OPERATION, SENTRY KEY..............8Q-2
IMMOBILIZER SYSTEM TRANSPONDER
PROGRAMMING, STANDARD
PROCEDURE - SENTRY KEY.............8Q-4
IMPACT SENSOR - DESCRIPTION, SIDE . . 8O-59
IMPACT SENSOR - OPERATION, SIDE....8O-59
INCORRECT FLUID LEVEL - DIAGNOSIS
AND TESTING, EFFECTS OF......21-201,21-366
INDEPENDENT FRONT SUSPENSION -
DESCRIPTION, GEAR..................19-17
INDEPENDENT FRONT SUSPENSION -
INSTALLATION, GEAR.................19-18
INDEPENDENT FRONT SUSPENSION -
REMOVAL, GEAR.....................19-17
INDICATOR - DESCRIPTION, ABS........8J-17
INDICATOR - DESCRIPTION, AIRBAG.....8J-18
INDICATOR - DESCRIPTION, BRAKE/
PARK BRAKE........................8J-19
INDICATOR - DESCRIPTION, CARGO
LAMP
..............................8J-20
INDICATOR - DESCRIPTION, CHECK
GAUGES
............................8J-21
INDICATOR - DESCRIPTION, CRUISE
.....8J-22
INDICATOR - DESCRIPTION, DOOR AJAR
. . 8J-23
INDICATOR - DESCRIPTION, ETC
........8J-25
INDICATOR - DESCRIPTION, GEAR
SELECTOR
..........................8J-27
INDICATOR - DESCRIPTION, HIGH BEAM
. . 8J-28
INDICATOR - DESCRIPTION, LAMP OUT
. . . 8J-29
INDICATOR - DESCRIPTION, LOW FUEL
. . . 8J-30
INDICATOR - DESCRIPTION, SEATBELT
. . . 8J-34
INDICATOR - DESCRIPTION, SECURITY
. . . 8J-35
INDICATOR - DESCRIPTION, SERVICE
4WD
...............................8J-36
INDICATOR - DESCRIPTION, TOW/HAUL
. . . 8J-39INDICATOR - DESCRIPTION, TRANS
TEMP..............................8J-40
INDICATOR - DESCRIPTION, TURN
SIGNAL............................8J-40
INDICATOR - DESCRIPTION, UPSHIFT....8J-41
INDICATOR - DESCRIPTION, WAIT-TO-
START .............................8J-44
INDICATOR - DESCRIPTION, WASHER
FLUID..............................8J-44
INDICATOR - DESCRIPTION, WATER-IN-
FUEL..............................8J-45
INDICATOR - DIAGNOSIS AND TESTING,
BRAKE.............................8J-20
INDICATOR - OPERATION, ABS..........8J-17
INDICATOR - OPERATION, AIRBAG.......8J-18
INDICATOR - OPERATION, BRAKE/PARK
BRAKE.............................8J-19
INDICATOR - OPERATION, CARGO LAMP . . 8J-20
INDICATOR - OPERATION, CHECK
GAUGES............................8J-21
INDICATOR - OPERATION, CRUISE.......8J-22
INDICATOR - OPERATION, DOOR AJAR . . . 8J-23
INDICATOR - OPERATION, ETC..........8J-25
INDICATOR - OPERATION, GEAR
SELECTOR..........................8J-27
INDICATOR - OPERATION, HIGH BEAM....8J-28
INDICATOR - OPERATION, LAMP OUT....8J-29
INDICATOR - OPERATION, LOW FUEL.....8J-30
INDICATOR - OPERATION, SEATBELT.....8J-34
INDICATOR - OPERATION, SECURITY......8J-36
INDICATOR - OPERATION, SERVICE 4WD . . 8J-37
INDICATOR - OPERATION, TOW/HAUL....8J-39
INDICATOR - OPERATION, TRANS TEMP . . 8J-40
INDICATOR - OPERATION, TURN SIGNAL . . 8J-41
INDICATOR - OPERATION, UPSHIFT......8J-42
INDICATOR - OPERATION, WAIT-TO-
START .............................8J-44
INDICATOR - OPERATION, WASHER
FLUID..............................8J-44
INDICATOR - OPERATION, WATER-IN-
FUEL..............................8J-45
INDICATOR LAMP - DESCRIPTION,
SENTRY KEY IMMOBILIZER SYSTEM......8Q-5
INDICATOR LAMP - OPERATION,
SENTRY KEY IMMOBILIZER SYSTEM......8Q-5
INDICATOR LAMP (MIL) - DESCRIPTION,
MALFUNCTION.......................8J-31
INDICATOR LAMP (MIL) - OPERATION,
MALFUNCTION.......................8J-31
INDICATOR TEST - STANDARD
PROCEDURE, BUILT-IN................8F-10
INDICATORS - DIAGNOSIS AND
TESTING, TREAD WEAR................22-8
INERTIA HINGE COVER - INSTALLATION,
CENTER SEAT BACK..................23-77
INERTIA HINGE COVER - REMOVAL,
CENTER SEAT BACK..................23-77
INFLATION PRESSURES - DESCRIPTION,
TIRE................................22-7
INFO CENTER - DESCRIPTION,
ELECTRONIC VEHICLE.................8M-7
INFO CENTER - INSTALLATION,
ELECTRONIC VEHICLE.................8M-9
INFO CENTER - OPERATION,
ELECTRONIC VEHICLE.................8M-7
INFO CENTER - REMOVAL, ELECTRONIC
VEHICLE............................8M-9
INITIAL OPERATION - STANDARD
PROCEDURE, POWER STEERING
PUMP.............................19-40
INITIALIZATION, STANDARD PROCEDURE
- SENTRY KEY IMMOBILIZER SYSTEM....8Q-3
INJECTED RINGS - ASSEMBLY, WITH......3-13
INJECTED RINGS - DISASSEMBLY, WITH . . . 3-11
INJECTION PUMP - DESCRIPTION, FUEL . . 14-53
INJECTION PUMP - INSTALLATION, FUEL . 14-55
INJECTION PUMP - OPERATION, FUEL....14-53
INJECTION PUMP - REMOVAL, FUEL.....14-54
INJECTION PUMP TIMING - DIAGNOSIS
AND TESTING, FUEL..................14-53
INJECTOR - DESCRIPTION, FUEL . . . 14-26,14-74
INJECTOR - INSTALLATION, FUEL........14-77
INJECTOR - OPERATION, FUEL
.....14-26,14-74
INJECTOR - REMOVAL, FUEL
...........14-75
INJECTOR FIRING ORDER, DIESEL -
FUEL
..............................14-48
INJECTOR RAIL - DESCRIPTION, FUEL
....14-78
INJECTOR RAIL - INSTALLATION, FUEL
. . . 14-78INJECTOR RAIL - OPERATION, FUEL.....14-78
INJECTOR RAIL - REMOVAL, FUEL.......14-78
INLET AIR TEMPERATURE SENSOR/
PRESSURE SENSOR - DESCRIPTION.....14-79
INLET AIR TEMPERATURE SENSOR/
PRESSURE SENSOR - INSTALLATION.....14-79
INLET AIR TEMPERATURE SENSOR/
PRESSURE SENSOR - OPERATION.......14-79
INLET AIR TEMPERATURE SENSOR/
PRESSURE SENSOR - REMOVAL........14-79
INLET FILTER - INSTALLATION..........14-20
INLET FILTER - REMOVAL..............14-20
INLET HOSE - INSTALLATION, HEATER....24-64
INLET HOSE - REMOVAL, HEATER.......24-64
INNER BELT MOLDING - INSTALLATION,
FRONT DOOR.......................23-93
INNER BELT MOLDING - INSTALLATION,
REAR DOOR........................23-94
INNER BELT MOLDING - REMOVAL,
FRONT DOOR.......................23-93
INNER BELT MOLDING - REMOVAL,
REAR DOOR........................23-94
INPUT - OPERATION, ASD SENSE - PCM . . . 8I-5
INPUT CLUTCH ASSEMBLY - ASSEMBLY . 21-378
INPUT CLUTCH ASSEMBLY -
DESCRIPTION......................21-373
INPUT CLUTCH ASSEMBLY -
DISASSEMBLY......................21-374
INPUT CLUTCH ASSEMBLY - OPERATION . 21-373
INPUT SHAFT SEAL - INSTALLATION,
STEERING GEAR.......................19-29
INPUT SHAFT SEAL - REMOVAL,
STEERING GEAR.....................19-27
INPUT SPEED SENSOR - DESCRIPTION . . 21-382
INPUT SPEED SENSOR - INSTALLATION . 21-382
INPUT SPEED SENSOR - OPERATION....21-382
INPUT SPEED SENSOR - REMOVAL.....21-382
INSERTS - INSTALLATION, SPRING TIP....2-45
INSERTS - REMOVAL, SPRING TIP........2-44
INSIDE HANDLE ACTUATOR -
INSTALLATION..................23-22,23-32
INSIDE HANDLE ACTUATOR - REMOVAL . . 23-22,
23-31
INSTRUMENT CLUSTER - ASSEMBLY.....8J-15
INSTRUMENT CLUSTER - DESCRIPTION . . . 8J-2
INSTRUMENT CLUSTER - DIAGNOSIS
AND TESTING.......................8J-10
INSTRUMENT CLUSTER - DISASSEMBLY . . 8J-14
INSTRUMENT CLUSTER - INSTALLATION . . 8J-16
INSTRUMENT CLUSTER - OPERATION.....8J-6
INSTRUMENT CLUSTER - REMOVAL.....8J-14
INSTRUMENT PANEL ANTENNA CABLE -
INSTALLATION.......................8A-7
INSTRUMENT PANEL ANTENNA CABLE -
REMOVAL...........................8A-7
INSTRUMENT PANEL ASSEMBLY -
INSTALLATION.......................23-55
INSTRUMENT PANEL ASSEMBLY -
REMOVAL..........................23-52
INSTRUMENT PANEL CENTER BEZEL -
INSTALLATION.......................23-57
INSTRUMENT PANEL CENTER BEZEL -
REMOVAL..........................23-57
INSTRUMENT PANEL DEMISTER DUCTS
- INSTALLATION.....................24-37
INSTRUMENT PANEL DEMISTER DUCTS
- REMOVAL.........................24-36
INSTRUMENT PANEL DRIVER SIDE
BEZEL - INSTALLATION................23-58
INSTRUMENT PANEL DRIVER SIDE
BEZEL - REMOVAL...................23-58
INSTRUMENT PANEL DUCTS -
INSTALLATION.......................24-37
INSTRUMENT PANEL DUCTS - REMOVAL . 24-37
INSTRUMENT PANEL HEADLAMP
SWITCH BEZEL - INSTALLATION.........23-56
INSTRUMENT PANEL HEADLAMP
SWITCH BEZEL - REMOVAL............23-56
INSTRUMENT PANEL LOWER
SURROUND - INSTALLATION...........23-59
INSTRUMENT PANEL LOWER
SURROUND - REMOVAL
...............23-59
INSTRUMENT PANEL TOP COVER -
INSTALLATION
.......................23-59
INSTRUMENT PANEL TOP COVER -
REMOVAL
..........................23-58
INTAKE AIR HEATER - DESCRIPTION
.....14-80
INTAKE AIR HEATER - INSTALLATION
.....14-80
DRINDEX 17
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