horn DODGE RAM 1999 Service Owner's Manual

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

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 deactivating air bag system. Air bag may 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 SWITCH
NOTE: Horn switch removal and installation information for Dakota
and Durango is not provided by manufacturer.
Removal & Installation
Disconnect negative battery cable. Remove 4 air bag nuts from
back of steering wheel. Pull air bag module back far enough to
disconnect wiring connectors. Remove air bag module. To install,
reverse removal procedure. Tighten air bag nuts to 90-97 INCH lbs. (9-
11 N.m).
IGNITION SWITCH
CAUTION: DO NOT bump, jolt or hammer on steering shaft and gearshift
tube.
Removal
Remove lock cylinder. See LOCK CYLINDER. Remove 3 tamper-
proof Torx screws. See Fig. 5. Gently pull switch away from column.
Release connector locks on wiring connectors and remove switch from
connectors.
Fig. 5: Removing Ignition Switch Mounting Screws
Courtesy of Chrysler Corp.
Installation
1) Rotate flag on ignition switch to RUN position. This

TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS








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Application INCH Lbs. (N.m)\
Air Bag Retaining Nuts ................................ 90-97 (9-11)\
Ignition Switch Mounting Screw ..................... 22-30 (2.5-3.5)\
Multifunction Switch Connector Screw ........................ 17 (2)\
Multifunction Switch Mounting Screw ......................... 17 (2)\
Steering Column Cover Screw ................................. 17 (2)\









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WIRING DIAGRAMS
Fig. 9: Horn System Wiring Diagram (Dakota)

Fig. 10: Horn System Wiring Diagram (Durango)

Fig. 11: Horn System Wiring Diagram (Ram Pickup)

Headlight Circuit, W/O DRL & W/O Quad Headlights
HORN

Horn Circuit
INSTRUMENT CLUSTER