1999 DODGE RAM horn

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)

WARNING: Wait about 2 minutes after disconnecting negative battery
cable before servicing air bag system. System reserve
capacitor maintains air bag system voltage for about 2
minutes after battery is disconnected. Servicing air bag
system before 2 minutes may cause accidental air bag
deployment and possible personal injury.
REMOVAL & INSTALLATION
WARNING: All models are equipped with Air Bag Restraint System (ABRS).
See AIR BAG PRECAUTIONS before working on vehicle. Use
caution when working around steering column (air bag could
deploy).
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.
HORN PAD & STEERING WHEEL
Removal & Installation
1) Disable air bag system. See AIR BAG DISABLING. Ensure
steering wheel is in straight-ahead position. Remove nuts mounting air
bag module to steering wheel. Remove screws securing cruise control
switch to steering wheel (if equipped).
2) Disconnect wiring connectors. Remove air bag module and
cruise control switch assembly. Pry trim covers from back of steering
wheel and remove horn switch mounting screws. Disconnect horn wires.
Remove horn switch.
3) Remove steering wheel retaining nut. Reference mark
steering wheel and steering shaft. Using puller, remove steering
wheel. To install, reverse removal procedure. Align marks made during
removal. Tighten steering wheel retaining nut to specification.
STEERING COLUMN
Removal & Installation
1) Position front wheels straight ahead. Disconnect and
isolate negative battery cable. On column shift models, remove link
rod from bushing in shift lever. Discard bushing. On all models,
remove steering wheel using Puller (C-3428-B). See HORN PAD & STEERING\
WHEEL.
2) Remove steering column shaft-to-coupler retaining pin.
Push upper coupler shaft down into lower steering coupler. Remove dash
panel column cover. On column shift models, disconnect shift indicator
cable.
3) On all models, remove tilt lever (if equipped). Remove
upper and lower shroud. Remove lower fixed shroud. Disconnect
multifunction switch harness connector. Disconnect harness connectors
from ignition switch, key-in light, horn and cruise control (if
equipped).
4) Loosen upper support bracket nuts and allow column to drop
slightly. Remove upper fixed shroud. Disconnect wiring harness
retainers from column, and move harness to one side. Remove lower dash
panel. Remove lower steering column nuts. Remove column.
CAUTION: DO NOT reuse bushing in shift rod lever once shift rod is
removed. Always install a NEW bushing.
5) To install column, reverse removal procedure. Connect

STE ER IN G C O LU M N S W IT C HES
1999 D odge P ic ku p R 1500
1999 ACCESSORIES & EQUIPMENT
CHRY - Steering Column Switches
Dakota, Durango & Ram Pickup
WARNING: Deactivate air bag system before performing any service
operation involving steering column components. See
appropriate AIR BAG RESTRAINT SYSTEMS article. DO NOT apply
electrical power to any component on steering column without
first disconnecting air bag module. Air bag may deploy. Wait
at least 2 minutes after disconnecting negative battery cable
before servicing air bag system. System reserve capacitor,
integral to ACM, maintains air bag system voltage for about 2
minutes after battery is disconnected. Servicing air bag
system before 2-minute period may cause accidental air bag
deployment and possible personal injury.
DESCRIPTION
Turn signal, hazard flasher, headlight beam selector,
headlight flash-to-pass, windshield wipe, pulse wipe and windshield
wash systems use a common switch assembly (multifunction switch)
mounted within upper steering column housing.
Ignition switch and lock cylinder are incorporated into an
assembly attached to side of steering column. Ignition switch assembly
can be serviced as a separate unit, but requires removal of lock
cylinder.
COMPONENT LOCATIONS
COMPONENT LOCATIONS








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Component Location
Combination Flasher Relay ........................... Junction Block
Horn ............................... In Right Front Corner Of Engine
Compartment
Horn Relay ............................ In Power Distribution Center
Junction Block ................. Under Left Side Of Instrument Panel
Power Distribution Center ...... In Left Side Of Engine Compartment,
On Left Inner Panel
Relay/Flasher Module ........ Under Right Side Of Instrument Panel,
Behind Glove Box









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TROUBLE SHOOTING
TURN SIGNAL AND HAZARD FLASHER SYSTEM
Bulbs Burn Out Rapidly
Check charging system. See appropriate GENERATORS &
REGULATORS article in STARTING & CHARGING SYSTEMS.
Hazard Flashers Inoperative
Blown fuse. Faulty hazard flasher. Open circuit in feed wire
to hazard switch. Faulty turn signal/hazard switch. Open or grounded
circuit in wiring to external lights.

Hazard Warning Lights Okay To Front Lights Only
Faulty external bulbs. Faulty contact in turn signal/hazard
switch. Open circuit between hazard switch and turn signal switch.
Open or grounded circuit in wiring to rear lights.
Hazard Warning Lights Okay To Rear Lights Only
Faulty external bulbs. Faulty contact in turn signal/hazard
switch. Open or grounded circuit in wiring to front lights.
Indicator Light Inoperative, External Lights Okay
Burned-out indicator bulb in instrument cluster. Faulty
contact. Open circuit.
Indicator Light Okay, External Lights Inoperative
Open circuit in wiring to external light(s).
Indicator Light Okay, External Lights Glow Dimly Or Do Not
Flash
Loose or corroded external light connections. Poor ground
circuit at external light(s).
Turn Signals Do Not Cancel After Turn
Broken canceling pawl on turn signal switch. Improperly
aligned canceling cam. Broken or loose canceling cam.
Turn Signals Inoperative (Both Sides)
Blown fuse. Faulty turn signal flasher. Loose bulkhead
connector. Loose or faulty rear wiring harness or terminals. Open
circuit to turn signal flasher. Open circuit in feed wire to turn
signal switch. Faulty switch connections. Open or grounded circuit in
wiring to external lights.
Turn Signal Inoperative (One Side)
Faulty external bulb. Poor ground at external light. Open
circuit in wiring to external light(s). Faulty turn signal/hazard
switch.
COMPONENT TESTS
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.
NOTE: For additional testing procedures, see appropriate CRUISE
CONTROL SYSTEMS and WIPER/WASHER SYSTEMS articles.
NOTE: For component locations, see COMPONENT LOCATIONS.
HORN RELAY
1) Remove horn relay from Power Distribution Center (PDC).
Use label on PDC cover to identify and locate relay. Check continuity
between relay terminals No. 87A and 30. See Fig. 1. If continuity does
not exist, replace relay. If continuity exists, go to next step.
2) Check continuity between relay terminals No. 30 and 87. If
continuity exists, replace relay. If continuity does not exist, check
resistance between relay terminals No. 85 and 86. If resistance is not
70-80 ohms, replace relay. If resistance is 70-80 ohms, go to next
step.
3) Using jumper wires, connect positive battery voltage to

relay terminal No. 86 and ground to relay terminal No. 85. Continuity
should exist between terminals No. 30 and 87. Continuity should not
exist between relay terminals No. 87A and 30. If continuity is not as
specified, replace relay. If continuity is as specified, relay is
okay. Go to HORN RELAY CIRCUIT test under SYSTEM TESTS.
Fig. 1: Identifying Horn Relay Terminals
Courtesy of Chrysler Corp.
IGNITION SWITCH
NOTE: For ignition switch circuit identification, see IGNITION
SWITCH CIRCUIT FUNCTIONS table.
Remove ignition switch. See IGNITION SWITCH under REMOVAL &
INSTALLATION. Check continuity between appropriate ignition switch
terminals with switch in specified position. See IGNITION SWITCH
CONTINUITY table. See Fig. 2.
IGNITION SWITCH CONTINUITY









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Switch Position Continuity Between Terminals
ACC .......................................................... 6 & 7
OFF ............................................................ ( 1)
RUN ............................................ 2 & 7; 4 & 5; 6 & 7
START ............................................. ( 2) 1 & 7; 2 & 7
( 1) - Continuity should not exist between any terminals with key
removed.
( 2) - Continuity should also exist between terminal No. 3 and case

Fig. 3: Identifying Multifunction Switch Terminals
Courtesy of Chrysler Corp.
SYSTEM TESTS
HORN
1) Check resistance between horn mounting bracket and ground.
If resistance is zero ohms, go to next step. If resistance is not zero
ohms, repair horn ground connection.
2) Check for battery voltage at horn harness connector when
horn switch is pressed. If battery voltage exists, replace horn. If
battery voltage does not exist, go to next step.
3) Test horn relay. See HORN RELAY under COMPONENT TESTS. If
relay is okay, check horn circuit. See HORN RELAY CIRCUIT. If relay is
not okay, replace horn relay.
HORN RELAY CIRCUIT
1) Remove horn relay from Power Distribution Center (PDC).
Measure voltage between ground and horn relay terminals No. 30 and 86
in PDC. See Fig. 4. If battery voltage exists at both terminals, go to
next step. If battery voltage does not exist at one or both terminals,
repair open circuit to PDC.
2) Disconnect both horn connectors. Check continuity between
horn relay terminal No. 87 in PDC and Dark Green/Red wire at each horn
harness connector. If continuity exists, go to next step. If
continuity does not exist, repair open in Dark Green/Red wire.
3) Check continuity between ground and relay terminal No. 85
in PDC. With horn switch depressed, continuity should exist. With horn
switch released, continuity should not exist. If continuity is not as
specified, go to HORN SWITCH. If continuity is as specified, no fault
is indicated in relay circuits.

Fig. 4: Identifying Horn Relay Terminals In PDC
Courtesy of Chrysler Corp.
HORN SWITCH
1) Disconnect negative battery cable. Remove steering column
opening cover from instrument panel. Check continuity between ground
and metal steering column jacket. If continuity exists, go to next
step. If continuity does not exist, check for proper installation of
steering column mounting nuts.
2) Disable air bag system and remove driver's air bag module.
See appropriate AIR BAG RESTRAINT SYSTEMS article. Remove horn relay
from Power Distribution Center (PDC). Use label on PDC cover to
identify and locate relay. Check continuity between horn relay
terminal No. 85 in PDC and Black/Red wire at steering column horn

switch connector. See Fig. 4. If continuity does not exist, repair
open Black/Red wire. If continuity exists, go to next step.
3) Check continuity between ground and Black/Red wire at
steering column horn switch connector. If continuity does not exist,
go to next step. If continuity exists, repair short to ground in
Black/Red wire.
4) Continuity between horn switch terminal and ground.
Continuity should exist with horn switch depressed. Continuity should
not exist without horn switch depressed. If continuity is not as
specified, replace horn switch. If continuity is as specified, install
horn relay and go to HORN under COMPONENT TESTS.
TURN SIGNAL & HAZARD WARNING SYSTEMS
1) If bulbs burn out rapidly, check charging system for
overcharging condition. See appropriate GENERATORS & REGULATORS
article in STARTING & CHARGING SYSTEMS. If charging system is okay, go
to next step. If charging system is not okay, repair as necessary.
2) If problem is turn signals failing to cancel after a turn,
inspect multifunction switch or cancelling cam lobes on clockspring
for damage or improper installation. If problem exists, repair as
necessary. If problem does not exist, go to next step.
3) Turn ignition on. Actuate turn signal switch or hazard
warning switch. Observe turn signal indicator light(s) in instrument
cluster. If flash rate is very high, check for a bulb that is not lit
or is dimly lit. Repair circuit or replace bulb as necessary. If turn
signals fail to light, go to next step.
4) Turn ignition off. Check turn signal fuse in junction
block and/or hazard warning fuse in PDC. If fuses are okay, go to next
step. If either fuse is blown, repair short circuit and replace fuse.
5) Check for battery voltage at hazard warning fuse in PDC.
Turn ignition on. Check for battery voltage at turn signal fuse in
junction block. If battery voltage exists, go to next step. If battery
voltage does not exist, repair open circuit to battery or ignition
switch as necessary.
6) Turn ignition off. Disconnect negative battery cable.
Remove combination flasher from junction block and replace with a
known good unit. Connect battery cable and test operation of turn
signal and hazard warning systems. If operation is okay, discard
faulty flasher. If operation is not okay, go to next step.
7) Turn ignition on. Check for battery voltage at combination
flasher terminals No. 51 and 48 in junction block. If battery voltage
exists, go to next step. If battery voltage does not exist, repair
open circuit to fuse in junction block or PDC as necessary.
8) Disconnect negative battery cable. Check continuity
between combination flasher terminal No. 50 and ground. If continuity
exists, go to next step. If continuity does not exist, repair open
ground circuit.
9) Disconnect multifunction switch harness connector. Check
continuity between junction block terminal No. 4 and multifunction
switch terminal No. 13 (Pink wire). If continuity exists, go to next
step. If continuity does not exist, repair open in Pink wire between
multifunction switch and junction block.
10) Check continuity between junction block terminal No. 13
and multifunction switch terminal No. 17 (Red/White wire). If
continuity exists, test multifunction switch. See MULTIFUNCTION SWITCH
under COMPONENT TESTS. If continuity does not exist, repair open in
Red/White wire between junction block and multifunction switch.
REMOVAL & INSTALLATION
WARNING: Deactivate air bag system before performing any service