1999 DODGE RAM fuse

scan tool does not display BUS (+) SHORTED TO GROUND, repair open
Violet/Brown wire.
7) Move jumper wire to CMTC connector terminal No. 8
(White/Black wire). If scan tool displays BUS (+) SHORTED TO GROUND,\
replace CMTC. If scan tool does not display BUS (+) SHORTED TO GROUND,\
repair open White/Black wire.
NO RESPONSE RADIO
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module
connector.
1) If radio screen is not blank, go to step 7). If radio
screen is blank, go to next step.
2) Remove and inspect junction block fuse No. 8 (radio). If
fuse is blown, go to next step. If fuse is okay, go to step 4).
3) Turn ignition off. Disconnect radio Gray connector. Using
external ohmmeter, measure resistance between ground and radio Gray
connector terminal No. 6 (Red/White wire). If resistance is less than
5 ohms, repair Red/White wire for short to ground. Replace junction
block fuse No. 8. If resistance is 5 ohms or more, replace radio.
Replace junction block fuse No. 8.
4) Turn ignition on. Measure voltage between ground and
terminal No. 7 (Pink wire). If voltage is 10 volts or less, repair
open Pink wire. If voltage is more than 10 volts, go to next step.
5) Install fuse. Disconnect radio Gray connector. Using
external voltmeter, measure voltage between ground and radio Gray
terminal No. 6 (Red/White wire). If voltage is 10 volts or less,
repair open Red/White wire. If voltage is more than 10 volts, go to
next step.
6) Inspect ground strap and antenna for correct installation.
Repair as needed. If ground strap and antenna are okay, replace radio.
7) Disconnect 2-pin CCD BUS connector on back of radio.
Connect jumper wire between terminal No. 2 (White/Black wire) and
ground. Using scan tool, select BODY, BODY COMPUTER, then SYSTEM TEST.
Perform CCD BUS test. If scan tool does not display BUS SHORT TO
GROUND, repair open White/Black wire. If scan tool displays BUS SHORT
TO GROUND, go to next step.
8) Move jumper wire to terminal No. 1 (Violet/Brown wire).
Perform CCD BUS test. If scan tool does not display BUS SHORT TO
GROUND, repair open Violet/Brown wire. If scan tool displays BUS SHORT
TO GROUND, replace radio.
NO TERMINATION
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1 after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module
connector.
1) Disconnect Powertrain Control Module (PCM) connectors. PC\
M
is mounted in right side of firewall. Connect jumper wire between
ground and PCM connector C3 terminal No. 30 (Violet/Brown wire). Using\
scan tool, select SYSTEM MONITORS. Perform CCD BUS test. If scan tool
does not display BUS SHORT TO GROUND, repair open Violet/Brown wire.
If scan tool displays BUS SHORT TO GROUND, go to next step.
2) Move jumper wire to PCM connector C3 terminal No. 28

full load. The Kent-Moore J-39021 is such a tool, though there are
others. The Kent-Moore costs around $240 at the time of this writing
and works on many different manufacturer's systems.
The second method is to use a lab scope. Remember, a lab
scope allows you to see the regular operation of a circuit in real
time. If an injector is having an short or intermittent short, the lab
scope will show it.
Checking Available Voltage At the Injector
Verifying a fuel injector has the proper voltage to operate
correctly is good diagnostic technique. Finding an open circuit on the
feed circuit like a broken wire or connector is an accurate check with
a DVOM. Unfortunately, finding an intermittent or excessive resistance
problem with a DVOM is unreliable.
Let's explore this drawback. Remember that a voltage drop due
to excessive resistance will only occur when a circuit is operating?
Since the injector circuit is only operating for a few milliseconds at
a time, a DVOM will only see a potential fault for a few milliseconds.
The remaining 90+% of the time the unloaded injector circuit will show
normal battery voltage.
Since DVOMs update their display roughly two to five times a
second, all measurements in between are averaged. Because a potential
voltage drop is visible for such a small amount of time, it gets
"averaged out", causing you to miss it.
Only a DVOM that has a "min-max" function that checks EVERY
MILLISECOND will catch this fault consistently (if used in that mode).\
The Fluke 87 among others has this capability.
A "min-max" DVOM with a lower frequency of checking (100
millisecond) can miss the fault because it will probably check when
the injector is not on. This is especially true with current
controlled driver circuits. The Fluke 88, among others fall into this
category.
Outside of using a Fluke 87 (or equivalent) in the 1 mS "min-\
max" mode, the only way to catch a voltage drop fault is with a lab
scope. You will be able to see a voltage drop as it happens.
One final note. It is important to be aware that an injector
circuit with a solenoid resistor will always show a voltage drop when
the circuit is energized. This is somewhat obvious and normal; it is a
designed-in voltage drop. What can be unexpected is what we already
covered--a voltage drop disappears when the circuit is unloaded. The
unloaded injector circuit will show normal battery voltage at the
injector. Remember this and do not get confused.
Checking Injector On-Time With Built-In Function
Several DVOMs have a feature that allows them to measure
injector on-time (mS pulse width). While they are accurate and fast to\
hookup, they have three limitations you should be aware of:
* They only work on voltage controlled injector drivers (e.g
"Saturated Switch"), NOT on current controlled injector
drivers (e.g. "Peak & Hold").
* A few unusual conditions can cause inaccurate readings.
* Varying engine speeds can result in inaccurate readings.
Regarding the first limitation, DVOMs need a well-defined
injector pulse in order to determine when the injector turns ON and
OFF. Voltage controlled drivers provide this because of their simple
switch-like operation. They completely close the circuit for the
entire duration of the pulse. This is easy for the DVOM to interpret.
The other type of driver, the current controlled type, start
off well by completely closing the circuit (until the injector pintle
opens), but then they throttle back the voltage/current for the
duration of the pulse. The DVOM understands the beginning of the pulse


WIN DO W S - P O W ER

1999 D odge P ic ku p R 1500
1999 ACCESSORIES & EQUIPMENT
CHRY - Power Windows
Caravan, Dakota, Durango, Ram Pickup, Ram Van, Ram Wagon,
Town & Country, & Voyager
DESCRIPTION & OPERATION
A permanent magnet motor moves each of the power windows,
including power vent windows. A positive and negative battery
connection to either of the 2 motor terminals will cause the motor to
rotate in one direction. Reversing current through these same 2
connections will cause the motor to rotate in the opposite direction.
Each individual motor is grounded through the master switch by a wire
attached to the instrument panel reinforcement.
Caravan, Durango, Town & Country and Voyager are equipped
with an Auto Down feature. Drivers window can be lowered without
having to hold the switch in the down position. Auto Down feature can
be activated by pressing down switch past first detent. Caravan, Town
& Country and Voyager have optional power vent windows. Power rear
vent windows are operated by switches mounted in driver's door panel.
NOTE: Power window circuits on Caravan, Town & Country, and Voyager
use Positive Temperature Coefficient (PTC) devices. The PTC
is a specified amperage solid-state resettable fuse. PTCs are
located in junction box behind driver's side of instrument
panel, to left of steering column. To reset PTC, all current
must be removed from PTC for approximately 20 seconds.
ADJUSTMENTS
WINDOWS
Remove door trim panel. See DOOR TRIM PANEL under REMOVAL &
INSTALLATION. Loosen bolts holding window to regulator. Raise window
fully, seating window in frame. Tighten bolts. Install door trim
panel.
TROUBLE SHOOTING
CARAVAN, TOWN & COUNTRY, & VOYAGER
Inspect both No. 8 and 9 (9-amp) PTCs in junction block.
Junction block is located under left side of instrument panel.
* Inspect fuse No. 23 (40-amp) in Power Distribution Center
(PDC). PDC is located on left side of engine compartment.
* Inspect ground at instrument panel left side cowl.
DAKOTA & DURANGO
Inspect circuit breaker No. 20 (20-amp on Dakota, 25-amp on
Durango) in fuse block. Fuse block is located on left end of
instrument panel.
* Inspect fuse No. 9 (40-amp) in Power Distribution Center
(PDC). PDC is located in left front corner of engine

compartment.
* Inspect power window system ground circuit. See WIRING
DIAGRAMS.
RAM PICKUP
Inspect fuse No. 2 (30-amp) located in Power Distribution
Center (PDC). PDC is located in left side of engine compartment.
* Inspect circuit breaker No. 1 (20-amp) in fuse block. Fuse
block is located under left side of instrument panel.
* Inspect power window system ground circuit. See WIRING
DIAGRAMS.
RAM VAN & RAM WAGON
Inspect circuit breaker No. 20 (20-amp) in junction block.
Junction block is located in left end of instrument panel.
* Inspect fuse No. 12 (40-amp) in Power Distribution Center
(PDC). PDC is located in left side of engine compartment.
* Inspect power window system ground circuit. See WIRING
DIAGRAMS.
COMPONENT TESTS
CIRCUIT BREAKER
Dakota, Durango, Ram Pickup, Ram Van & Ram Wagon
1) Locate circuit breaker for power window system. See
TROUBLE SHOOTING. Pull circuit breaker out slightly, but ensure
circuit breaker terminals still contact terminals in fuse block.
2) Connect voltmeter negative lead to ground. Using voltmeter
positive lead, check both terminals of circuit breaker for battery
voltage. If voltmeter indicates battery voltage at both terminals,
circuit breaker is okay.
3) If voltmeter indicates battery voltage at one terminal
only, replace faulty circuit breaker. If voltmeter indicates no
voltage at either terminal, check for an open or shorted circuit to
circuit breaker. Repair as necessary and recheck system operation.
VENT WINDOW MOTOR
Caravan, Town & Country, & Voyager
1) Remove "D" pillar trim panel. See "D" PILLAR TRIM PANEL
under REMOVAL & INSTALLATION. Disconnect vent window motor connector.
Using jumper wires, apply battery voltage to vent window motor
terminals. Motor should rotate in one direction, moving window open or
closed. If window is in full closed or open position, no movement will
be observed and motor will make a grunting noise.
2) Reverse battery leads. Window should move in opposite
direction. If window does not move or window does not make a grunting
noise, replace vent window motor. If window moved completely open and
closed, motor should be reversed one more time to complete a full
window movement inspection.
3) If motor grunts and window does not move, remove motor
assembly. Check window motor crank for binding. Repair as necessary.
Recheck window operation. If window moves, check power window switch
continuity. See POWER WINDOW SWITCH. Replace switch as necessary. If
window switch is okay, check for open circuit between window motor and
window switch. See WIRING DIAGRAMS. Repair as necessary.

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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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