1999 DODGE RAM Service Repair Manual

WIRING DIAGRAMS
Fig. 20: Air Bag System Wiring Diagram

AN TI- L O CK B RAK E S A FE TY P R EC AU TIO NS

1999 D odge P ic ku p R 1500
GENERAL INFORMATION
Anti-Lock Brake Safety Precautions
* PLEASE READ THIS FIRST *
This article is intended for general information purposes
only. This information may not apply to all makes and models. If
vehicle is equipped with Anti-Lock Brake System (ABS), refer to
appropriate ANTI-LOCK BRAKE SYSTEM article in the BRAKES section for
description, operation, depressurizing, testing, system bleeding,
trouble shooting and servicing of specific system.
WARNING: Failure to depressurize ABS could lead to physical injury.
ANTI-LOCK BRAKE SAFETY PRECAUTIONS
WARNING: Failure to depressurize ABS could lead to physical injury.
* NEVER open a bleeder valve or loosen a hydraulic line
while ABS is pressurized.
* NEVER disconnect or reconnect any electrical connectors
while ignition is on. Damage to ABS control unit may result.
* DO NOT attempt to bleed hyudarulic system without first
referring to the appropriate ANTI-LOCK BRAKE SYSTEM article
in the BRAKES section.
* Only use specially designed brake hoses/lines on ABS equipped
vehicles.
* DO NOT tap on speed sensor components (sensor, sensor rings).
Sensor rings must be pressed into hubs, NOT hammered into
hubs. Striking these components can cause demagnetization or
a loss of polarization, affecting the accuracy of the speed
signal returning to the ABS control unit.
* DO NOT mix tire sizes. Increasing the width, as long as tires
remain close to the original diameter, is acceptable. Rolling
diameter must be identical for all 4 tires. Some
manufacturers recommend tires of the same brand, style and
type. Failure to follow this precaution may cause inaccurate
wheel speed readings.
* DO NOT contaminate speed sensor components with grease. Only
use recommended coating, when system calls for an
anti-corrosion coating.
* When speed sensor components have been removed, ALWAYS check
sensor-to-ring air gaps when applicable. These specifications
can be found in each appropriate article.
* ONLY use rocommended brake fluids. DO NOT use silicone brake
fluids in an ABS equipped vehicle.
* When instlling transmittion devices (CB's, telephones, etc.)
on ABS equipped vehicles, DO NOT locate the antenna near the
ABS control unit (or any control unit).
* Disconnect all on-board computers, when using electric
welding equipment.
* DO NOT expose the ABS control unit to prolonged periods of
high heat (185
F/85C for 2 hours is generally considered a
maximum limit).


AN TI- T H EFT S YSTE M

1999 D odge P ic ku p R 1500
1999 ACCESSORIES & EQUIPMENT
CHRY - Anti-Theft Systems
Ram Pickup, Ram Van & Ram Wagon
DESCRIPTION
The Vehicle Theft Security System (VTSS) provides an engine
no-run feature, flashes headlights and sounds horn if any door or hood
is opened without using key or remote keyless entry transmitter, or if
battery cables are disconnected then reconnected when system is
activated.
Anti-theft system is controlled by Central Timer Module
(CTM). CTM is located under driver's side of dash panel, right of
steering column. If CTM is faulty, CTM cannot be repaired and must be
replaced.
VTSS is also equipped with a power-up mode. If battery is
disconnected or looses power while VTSS is armed, VTSS system remains
armed when power is restored. A temper alert signal is sounded on
vehicle entry if VTSS was triggered while away from vehicle. Horn will
sound 3 times alerting owner VTSS was triggered.
OPERATION
ARMING PROCEDURE (PASSIVE)
Remove key from ignition. Ensure headlights are off. Lock
doors while open, using power lock switch. Power lock switch will not
operate with key in ignition or headlights on while door is open.
Vehicle Theft Security System (VTSS) will not arm using key in lock
cylinder or mechanical lock button. While system is arming, SECURITY
light will flash rapidly for 15 seconds. Opening any door or turning
the ignition key while light is flashing will abort arming process.
Once arming process is complete, SECURITY light will go out.
ARMING PROCEDURE (ACTIVE)
Pressing Remote Keyless Entry (RKE) transmitter LOCK button
will actively arm Vehicle Theft Security System (VTSS). All doors must\
be closed and ignition switch in OFF position. While system is arming,
SECURITY light will flash rapidly for 15 seconds. Opening any door or
turning the ignition key while light is flashing will abort arming
process. Once arming process is complete, SECURITY light will go out.
DISARMING
Vehicle Theft Security System (VTSS) can be disarmed 2 ways:
unlock vehicle using key in any door and pressing remote keyless entry
transmitter UNLOCK button. If alarm has been set off, either method
can be used to disarm and shut-off horn.
CENTRAL TIMER MODULE (CTM)
Central Timer Module (CTM) is Vehicle Theft Security System
(VTSS) processor. CTM uses the data bus network to allow sharing and
reporting of sensor information. If a door ajar sensor is opened while
VTSS is set, a signal is sent to flash headlights and sound horn. PCM
is also notified through bus network to enable engine no-run feature.

CTM has remote keyless entry receiver and control logic incorporated.
COMPONENT TESTS
RELAYS
NOTE: Headlight relay may also be referred to as the security
relay. On Ram Pickup, the headlight relay is located in Power
Distribution Center (PDC) in engine compartment. On Ram Van
and Ram Wagon, the headlight relay is taped to headlight
switch harness. On Ram Pickup, the horn relay is located in
Power Distribution Center (PDC) in engine compartment. On Ram\
Van and Ram Wagon, the horn relay is located in junction
block under left side of instrument panel. For circuit
testing, see WIRING DIAGRAMS.
Headlight Relay & Horn Relay
Remove relay to be tested. Measure resistance between
appropriate relay terminals with relay de-energized and energized. See
RELAY TEST SPECIFICATIONS table. See Fig. 1. If continuity or
resistance is not as specified, replace relay.
RELAY TEST SPECIFICATIONS









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Terminals Condition
De-Energized
87A & 30 .............................................. Continuity
87 & 30 ............................................ No Continuity
85 & 86 .................................... 70-80 Ohms Resistance
Energized ( 1)
87 & 30 ............................................... Continuity
87A & 30 ........................................... No Continuity
( 1) - Apply position battery voltage to terminal No. 85 and ground
terminal No. 86.









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Fig. 1: Identifying Relay Connector Terminals
Courtesy of Chrysler Corp.
SYSTEM TESTS

For Vehicle Theft Security System (VTSS) testing procedures,
see appropriate BODY CONTROL COMPUTER TESTS article.
REMOVAL & INSTALLATION
CENTRAL TIMER MODULE (CTM)
NOTE: Before removing Central Timer Module (CTM), use scan tool to
view settings for programmable features. Use these settings
to program replacement CTM.
Removal & Installation (Ram Pickup)
1) Disconnect negative battery cable. Remove left underdash
cover and knee bolster reinforcement. Remove 2 CTM retaining screws at
right side of underdash opening. See Fig. 2.
2) Slide CTM down into opening far enough to gain access to
connectors. Disconnect harness connectors and remove CTM from
underdash. To install, reverse removal procedure. Reprogram new CTM.
See appropriate BODY CONTROL COMPUTER TESTS article.
Removal & Installation (Ram Van & Ram Wagon)
1) Disconnect negative battery cable. Remove left underdash
cover and knee bolster reinforcement. Remove 3 CTM retaining screws
from left center instrument panel support. See Fig. 3.
2) Slide CTM away from mounting enough to gain access to
connectors. Disconnect harness connectors and remove CTM from
underdash. To install, reverse removal procedure. Reprogram new CTM.
See appropriate BODY CONTROL COMPUTER TESTS article.
Fig. 2: Identifying CTM Location (Ram Pickup)
Courtesy of Chrysler Corp.

Fig. 3: Identifying CTM Location (Ram Van & Ram Wagon)
Courtesy of Chrysler Corp.
DOOR JAMB SWITCH
NOTE: Door jamb switch may also be referred to as door ajar switch.
On Ram Van and Ram Wagon, front door jamb switches are part
of latch assembly and are not serviced separately.
Removal & Installation
Disconnect negative battery cable. On Ram Van and Ram Wagon,
unscrew door ajar switch from pillar. On Ram Pickup, using pliers,
pull back and forth to slide switch from pillar. On all models, pull
door jamb switch away from pillar enough to disconnect 2 harness
connectors. To install, reverse removal procedure.
DOOR LOCK CYLINDER SWITCH
Removal & Installation (Ram Pickup)
Disconnect negative battery cable. Remove inside door panel.
Remove door outside latch handle mounting hardware and linkage. Pull
door outside handle away from door far enough to remove door lock
cylinder switch from back of door lock cylinder. See Fig. 4. Remove

door lock cylinder switch pigtail retainers and remove door lock
cylinder switch. To install, reverse removal procedure.
Removal & Installation (Ram Van & Ram Wagon)
Disconnect negative battery cable. Remove inside door panel.
Disconnect door lock cylinder harness connector. Disengage door lock
cylinder switch from back of door lock cylinder. Remove door lock
cylinder switch pigtail retainers and remove door lock cylinder
switch. To install, reverse removal procedure.
Fig. 4: Identifying Door Lock Cylinder Switch (Ram Pickup)
Courtesy of Chrysler Corp.
WIRING DIAGRAMS

Fig. 5: Anti-Theft System Wiring Diagram (Ram Pickup)