Dodge 2000 DURANGO Service Manual page 470

8Q - 4 VEHICLE THEFT/SECURITY SYSTEMS
DESCRIPTION AND OPERATION (Continued)
HORN RELAY
The horn relay is a International Standards Orga-
nization (ISO) micro-relay. The terminal designations
and functions are the same as a conventional ISO
relay. However, the micro-relay terminal orientation
(or footprint) is different, current capacity is lower,
and the relay case dimensions are smaller than those
of the conventional ISO relay.
The horn relay is a electromechanical device that
switches battery current to the horn when the horn
switch or the high-line Central Timer Module (CTM)
grounds the relay coil. Refer to Relays in the Diag-
nosis and Testing section of this group for more infor-
mation.
The horn relay is located in the Junction Block
(JB), on the left end of the instrument panel in the
passenger compartment. See the fuse and relay lay-
out label on the inside of the fuse access panel for
relay identification and location.
If a problem is encountered with a continuously
sounding horn, it can usually be quickly resolved by
removing the horn relay from the JB until further
diagnosis is completed.
The horn relay cannot be repaired and, if faulty or
damaged, it must be replaced.
SECURITY LAMP
The security lamp is located within the instrument
cluster on the instrument panel. The security lamp is
illuminated by a red Light-Emitting Diode (LED)
that is integral to the instrument cluster circuit
board. The security lamp receives fused battery feed
at all times and is grounded by the high-line Central
Timer Module (CTM) to give a visual indication of
the Vehicle Theft Security System (VTSS) arming
status.
The security lamp cannot be repaired and, if faulty
or damaged, the instrument cluster unit must be
replaced. Refer to Instrument Cluster in the Removal
and Installation section of Group 8E - Instrument
Panel Systems for the service procedures.
DIAGNOSIS AND TESTING
VEHICLE THEFT SECURITY SYSTEM
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL,
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
GROUP 8M - PASSIVE
STEERING COLUMN,
The Vehicle Theft Security System (VTSS) and the
Chrysler Collision Detection (CCD) data bus network
should be diagnosed using a DRB scan tool and the
proper Diagnostic Procedures manual. The DRB will
provide confirmation that the data bus is functional,
that the high-line Central Timer Module (CTM) is
receiving and sending the proper messages on the
data bus, that the CTM is receiving the proper hard-
wired inputs and sending the proper hard-wired out-
puts, and that the Powertrain Control Module (PCM)
is receiving the data bus messages from the CTM.
Refer to the Vehicle Theft Security System menu
item on the DRB scan tool for the procedures. Refer
to 8W-39 - Vehicle Theft Security System in Group
8W - Wiring Diagrams for complete circuit descrip-
tions and diagrams.
DOOR LOCK CYLINDER SWITCH
Refer to Vehicle Theft Security System in the
index of this service manual for the location of com-
plete door lock cylinder switch wiring diagrams.
(1) Disconnect the door lock cylinder switch wire
harness connector from the door wire harness con-
nector.
(2) Using an ohmmeter, perform the switch resis-
tance checks between the two cavities of the door
lock cylinder switch wire harness connector. Actuate
the switch by rotating the key in the door lock cylin-
der to test for the proper resistance values in each of
the three switch positions, as shown in the Door Lock
Cylinder Switch chart.
DOOR LOCK CYLINDER SWITCH
Switch Position
Driver Side
Neutral
Lock (Clockwise)
Unlock (Counter
Clockwise)
(3) If a door lock cylinder switch fails any of the
resistance tests,
required.
LIFTGATE LOCK CYLINDER SWITCH
Refer to Vehicle Theft Security System in the
index of this service manual for the location of com-
plete liftgate lock cylinder switch wiring diagrams.
OR
(1) Disconnect the likftgate lock cylinder switch
wire harness connector from the liftgate wire harness
connector.
Resistance
Passenger Side
Neutral 12 Kilohms
Lock (Counter
644 Ohms
Clockwise)
Unlock
1565 Ohms
(Clockwise)
replace the faulty
DN
switch as