relay DODGE RAM 1999 Service Repair Manual

PCM.
MISCELLANEOUS CONTROLS
NOTE: Although not strictly considered part of engine performance
system, some controlled devices can adversely affect
driveability if they malfunction.
A/C CLUTCH RELAY
A/C clutch relay is controlled by PCM. When A/C or Defrost
mode is selected and PCM receives A/C request signal from evaporator
switch, PCM will cycle clutch on and off through A/C clutch relay.
When this relay is energized during engine operation, PCM will
determine correct engine idle speed through IAC motor.
When PCM senses low idle speed or wide open throttle through
TP sensor, PCM will de-energize A/C clutch relay, preventing A/C
operation.
AUTO SHUTDOWN (ASD) RELAY & FUEL PUMP RELAY
ASD relay and electric fuel pump relay are energized when
ignition is on. These relays are controlled through PCM by switching a
common ground circuit on and off. Following components are controlled
by ASD and fuel pump relays:
* Electric Fuel Pump
* Fuel Injectors
* Generator Field Winding
* Ignition Coil(s)
* HO2S Heating Element
When ignition switch is turned to RUN position, PCM energizes
ASD relay and electric fuel pump relay which powers these components.
If PCM does not receive a CMP and CKP sensor signal within one second
of engine cranking (start-up), PCM will turn ground circuit off and
de-energize ASD relay.
GENERATOR
Powertrain Control Module (PCM) regulates charging system
voltage.
LIMP-IN MODE
Limp-in mode is the attempt by PCM to compensate for failure
of certain components by substituting information from other sources
so that vehicle can still be operated. If PCM senses incorrect data or
no data at all from MAP sensor, TP sensor, ECT sensor or battery
voltage, system is placed into limp-in mode and Malfunction Indicator
Light (MIL) on instrument panel comes on.
If faulty sensor comes back on line, PCM will resume closed
loop operation. On some vehicles, MIL will remain on until ignition is
shut off and vehicle is restarted. To prevent damage to catalytic
converter, vehicle should NOT be driven for extended periods in limp-
in mode.
RADIATOR FAN RELAY
Electric cooling fan is used only on Dakota. Using
information supplied by A/C signal (if equipped), ECT sensor, and VSS,\

PCM controls operation of electric cooling fan. PCM operates fan
through radiator fan relay by grounding or ungrounding relay control
circuit. PCM regulates engine idle speed through IAC motor when fan is
on.
SHIFT INDICATOR LIGHT
PCM provides ground for shift indicator light on models
equipped with manual transmission. Based on engine speed, throttle
position, and vehicle speed, PCM turns shift indicator light on to
advise driver to shift to a higher gear for optimum fuel economy.
SPEED CONTROL SERVO
System is electrically actuated and vacuum operated. Controls
are located on steering wheel. Controls consist of 3 buttons: OFF/ON,
RESUME/ACCEL and SET/DECEL. Speed control servo is controlled by PCM.
System will operate at 35-85 MPH.
TACHOMETER
PCM provides signal to drive tachometer.
TORQUE CONVERTER CLUTCH (TCC) SOLENOID
PCM controls torque converter lock-up through TCC solenoid.
PCM controls lock-up according to various operating conditions.
TRANSMISSION GOVERNOR SOLENOID
PCM controls solenoid to regulate line pressure for shift
control.
TRANSMISSION OVERDRIVE/OVERRIDE (OD/OR) SWITCH INDICATOR
LIGHT
PCM controls indicator light on OD/OR switch on models
equipped with overdrive automatic transmission.
TRANSMISSION OVERDRIVE (OD) SOLENOID
On models equipped with OD transmission, PCM controls 3-4 OD
upshift and downshift through OD solenoid. PCM determines optimum OD
shift scheduling for all operating conditions.


WIP ER /W ASH ER S YSTE M

1999 D odge P ic ku p R 1500
1999 ACCESSORIES & EQUIPMENT
CHRY - Wiper/Washer Systems
Ram Pickup
DESCRIPTION & OPERATION
A permanent magnet wiper motor is used for low, high or
intermittent (delay) wiper functions. Base intermittent (delay) wipe\
r
function provides a .5-18 second delay mode. On high-line models,
delay function is speed sensitive. At vehicle speeds greater than 10
MPH, delay mode range is 1/2-18 seconds. At vehicle speeds less than
10 MPH, delay mode doubles to 1-36 seconds.
Delay function is controlled by Central Timer Module (CTM),
located under passenger side of instrument panel, outboard of glove
box. CTM switches an intermittent wiper relay, located in Power
Distribution Center (PDC). On high line models, CTM is connected to
Chrysler Collision Detection (CCD) data bus network to receive vehicle\
speed information for delay function.
Washer system consists of rubber hoses and nozzles, an
electric pump, sealed motor, low washer fluid indicator (if equipped)
and reservoir.
ADJUSTMENTS
WIPER BLADES
With wiper arms removed, cycle wiper motor into PARK
position. Mount arms on pivot shafts, and ensure distances are as
specified. See Fig. 1. Operate wiper blades, and check whether they
return to proper position. If wiper blades do not return to this
position, check linkage and pivot assembly for wear and binding.
Fig. 1: Adjusting Wiper Blades
Courtesy of Chrysler Corp.
TROUBLE SHOOTING

MOTOR WILL NOT RUN
Check for blown fuse. Check voltage at motor. Check wiper
switch, ground circuit and wiring.
MOTOR RUNS, BLADES DO NOT MOVE
Check for loose motor crank, disconnected linkage or loose
arms on pivot shaft. Check for faulty wiper motor.
BLADES DO NOT PARK PROPERLY
Check for improperly installed wiper arms. Check for faulty
linkage. Check for faulty wiring, wiper switch or wiper motor.
WIPER KNOCK NOISE
Check for improperly installed wiper arms. Check for faulty
linkage or wiper motor.
BLADES CHATTER
Check for foreign substance on blades or glass. Check for
twisted arm holding blade at wrong angle to glass. Check for bent or
damaged blades.
WASHERS DO NOT OPERATE
Check for low washer fluid level. Check for contaminated
washer fluid. Check for leaking or improperly routed hoses. Check for
faulty wiring, wiper switch or washer pump.
COMPONENT TESTS
INTERMITTENT WIPER RELAY
1) Remove relay. See INTERMITTENT WIPER RELAY under REMOVAL &
INSTALLATION. Check continuity between relay terminals No. 30 and 87A.
Continuity should exist. Check continuity between relay terminals No.
30 and 87. Continuity should not exist. Check resistance between relay
terminals No. 85 and 86. Resistance should be 70-80 ohms.
2) Connect battery voltage between relay terminals No. 85 and
86. Check continuity between relay terminals No. 30 and 87A.
Continuity should not exist. Check continuity between relay terminals
No. 30 and 87. Continuity should exist. Replace relay if continuity or
resistance is not as specified.
WIPER/WASHER SWITCH
NOTE: Wiper/washer switch is part of multifunction steering column
switch. If wiper/washer switch fails, entire multifunction
switch must be replaced.
Disconnect wiper/washer switch connector. Check continuity
between appropriate switch terminals with switch in specified
position. See WIPER/WASHER CONTINUITY TEST table. See Fig. 2. Replace
multifunction switch if continuity is not as specified.
WIPER/WASHER CONTINUITY TEST









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2) Turn wiper switch off. Depress washer switch. Washer pump
and wipers should operate while switch is depressed. Wipers should
operate about 3 sweeps after switch is released. If wipers are okay
but washer is not, go to next step. If washer is okay but wipers are
not, go to step 5).
3) Turn ignition off. Disconnect negative battery cable.
Disconnect washer pump harness connector. Check resistance between
washer pump harness connector Black wire terminal and ground. If
resistance is more than zero ohms, repair open in Black wire. If
resistance is zero ohms, go to next step.
4) Connect negative battery cable. Turn ignition on. While
depressing washer switch, check voltage at washer pump harness
connector Brown wire terminal. If battery voltage exists, replace
pump. If battery voltage does not exist, repair open in Brown wire.
5) Turn ignition off. Disconnect negative battery cable.
Access CTM and disconnect CTM harness connector. Connect negative
battery cable. Turn ignition on. With washer switch depressed, check
voltage at CTM 14-pin harness connector terminal No. 10 (Brown wire).
See Fig. 3 . If battery voltage exists, check intermittent relay. See
INTERMITTENT WIPER RELAY under COMPONENT TESTS. If battery voltage
does not exist, repair open in Brown wire.
Fig. 3: Identifying Central Timer Module 14-Pin Harness Connector
Terminals
Courtesy of Chrysler Corp.
WIPER

NOTE: This testing applies to base model Ram Pickup. For high line
Ram Pickup testing, see appropriate BODY CONTROL COMPUTER
TESTS article.
NOTE: Wiper system utilizes a Central Timer Module (CTM) to control\
intermittent functions of wiper system. If problem is only
pulse wipe or wipe-after-wash, see WASHER.
1) Check fuse No. 6 (25-amp) in junction block. If fuse is
blown, replace fuse and repair short as necessary. If fuse is okay, go
to next step.
2) Turn ignition on. Check for battery voltage at fuse. If
battery voltage does not exist, repair open circuit between fuse and
ignition switch as necessary. If battery voltage exists, go to next
step.
3) Turn ignition off. Disconnect negative battery cable.
Disconnect multifunction switch harness connector. Connect negative
battery cable. Turn ignition on. Check for battery voltage at
multifunction switch harness connector terminal No. 4 (Dark Blue
wire). See Fig. 2. If battery voltage exists, go to next step. If
battery voltage does not exist, repair open in Dark Blue wire between
fuse and multifunction switch.
4) If problem is intermittent wipe feature only, go to next
step. If problem is with all wiper modes or only HI and/or LO speed
modes, go to step 7).
5) Turn ignition off. Disconnect negative battery cable.
Disconnect CTM 14-pin harness connector. Check continuity between
multifunction switch harness connector terminal No. 1 (White/Dark Blue
wire) and CTM 14-pin harness connector terminal No. 12 (White/Dark
Blue wire). See Fig. 3. If continuity does not exist, repair open in
White/Dark Blue wire. If continuity exists, go to next step.
6) Check continuity between multifunction switch harness
connector terminal No. 2 (Violet wire) and CTM 14-pin harness
connector terminal No. 3 (Violet wire). If continuity does not exist,
repair open in Violet wire. If continuity exists, check intermittent
relay. See INTERMITTENT WIPER RELAY under COMPONENT TESTS.
7) Check continuity between multifunction switch harness
connector terminals No. 6 (Brown/White wire) and No. 9 (Brown/White
wire). If continuity does not exist, repair open in Brown/White wire.
If continuity exists, go to next step.
8) Check multifunction (wiper/washer) switch. See
WIPER/WASHER SWITCH under COMPONENT TESTS. If switch tests okay,
connect switch and go to next step. If switch does not test okay,
replace multifunction switch.
9) Turn ignition off. Disconnect negative battery cable.
Access wiper motor harness connector. Check resistance between wiper
motor harness connector Black wire terminal and ground. If resistance
is more than zero ohms, repair open in Black wire. If resistance is
zero ohms, go to next step.
10) Connect negative battery cable. Turn ignition on. Check
voltage by backprobing at wiper motor harness connector terminals
listed with multifunction switch in appropriate position. See SWITCH
POSITION VOLTAGE TEST table. If battery voltage exists at each
terminal, go to next step. If battery voltage does not exist at any
terminal, repair open in appropriate wire.
SWITCH POSITION VOLTAGE TEST









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Switch Position Wiper Motor Terminal
Any .............................................................. 3
Low .............................................................. 4

bolster. Remove CTM from bracket on inboard side of instrument panel
steering column opening. Disconnect harness connectors. To install,
reverse removal procedure.
INTERMITTENT WIPER RELAY
Removal & Installation
Intermittent wiper relay is located in Power Distribution
Center (PDC) in engine compartment. Remove cover and remove relay. To
install, reverse removal procedures
WIPER ARMS
Removal & Installation
Open hood. Lift wiper and slide latch to hold wiper off of
windshield. With a rocking motion, remove wiper arm. To install,
ensure wiper motor is in park position. Slide wiper arm on shaft.
Align wiper arms. See WIPER BLADES under ADJUSTMENTS.
WIPER MOTOR
NOTE: Wiper linkage and motor module is replaced as a unit.
Removal & Installation
1) Disconnect negative battery cable. Remove wiper arms. See
WIPER ARMS. Remove weatherstrip along front edge of cowl. Release
plastic anchor screws. Lift cowl grille from vehicle. Remove washer
hose from "Y" fitting. Set grille aside.
2) Remove wiper linkage mounting bolts. Turn linkage over and
disconnect harness connector from wiper motor. Remove wiper linkage
and motor module. To install, reverse removal procedure. Align wiper
arms. See WIPER BLADES under ADJUSTMENTS.
WIPER/WASHER SWITCH
NOTE: Wiper/washer switch is part of multifunction steering column
switch. If wiper/washer switch fails, entire multifunction
switch must be replaced.
Removal & Installation
1) Disconnect negative battery cable. Remove tilt lever (if
equipped). Remove steering column upper and lower covers to access
switch connector. Remove switch connector. Remove multifunction switch
tamperproof screws.
2) Gently pull switch away from column and loosen connector
screw (screw remains in connector). Remove switch. To install, reverse\
removal procedure. Tighten screws and nuts to specification. See
TORQUE SPECIFICATIONS. Ensure switch is functioning properly.
WASHER RESERVOIR
Removal & Installation
Disconnect negative battery cable. Drain cooling system.
Disconnect upper radiator hose from radiator. Disconnect harness
connectors from washer pump and washer fluid level sensor. Remove
washer supply hose from washer pump and drain washer fluid. While
pulling reservoir away from fan shroud, lift reservoir upward to
disengage mounting tabs from fan shroud. Remove washer reservoir. To
install, reverse removal procedure.
WASHER MOTOR
Removal & Installation