Dodge 2000 DURANGO Service Manual page 469

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DESCRIPTION AND OPERATION (Continued)
tion section of Group 8E - Instrument Panel Systems
for the service procedures.
For diagnosis of the high-line version of the CTM
or of the CCD data bus, a DRB scan tool and the
proper Diagnostic Procedures manual are recom-
mended. The CTM cannot be repaired and, if faulty
or damaged, it must be replaced.
DOOR AJAR SWITCH
The door ajar switches are integral to the door
latches on each door. The switches close a path to
ground for the Central Timer Module (CTM) when a
door is opened, and open the ground path when a
door is closed.
The door ajar switches cannot be repaired and, if
faulty or damaged, the door latch unit must be
replaced.
LIFTGATE AJAR SWITCH
The liftgate ajar switch is integral to the latch on
the liftgate. The switch closes a path to ground for
the Central Timer Module (CTM) when the liftgate is
opened, and opens the ground path when the liftgate
is closed.
The liftgate ajar switch cannot be repaired and, if
faulty or damaged, the liftgate latch unit must be
replaced.
DOOR LOCK CYLINDER SWITCH
DESCRIPTION
The door lock cylinder switches are mounted to the
back of the key lock cylinder inside each front door.
They are resistor multiplexed momentary switches
that are hard wired between a body ground and the
Central Timer Module (CTM) through the front door
wire harnesses. These switches are driven by the key
lock cylinders and contain three internal resistors.
One resistor is used for the neutral switch position,
one for the lock position and one for the unlock posi-
tion.
The door lock cylinder switches cannot be adjusted
or repaired and, if faulty or damaged, they must be
replaced. For complete circuit diagrams, refer to
Vehicle Theft Security System in the Contents of
Group 8W - Wiring Diagrams.
OPERATION
The door lock cylinder switches are actuated by the
key lock cylinder when the key is inserted in the lock
cylinder and turned to the lock or unlock positions.
The door lock cylinder switch closes a path to ground
through one of three internal resistors for the CTM
when the front door key lock cylinder is in the lock,
unlock or neutral positions. The CTM reads the
switch status through an internal pull-up, then uses
VEHICLE THEFT/SECURITY SYSTEMS
this input and its internal programming to control
the proper Vehicle Theft Security System (VTSS) and
power lock system outputs.
LIFTGATE LOCK CYLINDER SWITCH
DESCRIPTION
The liftgate lock cylinder switch is mounted to the
back of the liftgate key lock cylinder inside the lift-
gate. It is a resistor multiplexed momentary switch
that is hard wired between a body ground and the
Central Timer Module (CTM) through the liftgate
wire harness. This switch is driven by the key lock
cylinder and contains three internal resistors. One
resistor is used for the neutral switch position, one
for the lock position and one for the unlock position.
The liftgate lock cylinder switch cannot be adjusted
or repaired and, if faulty or damaged, it must be
replaced. For complete circuit diagrams, refer to
Vehicle Theft Security System in the Contents of
Group 8W - Wiring Diagrams.
OPERATION
The liftgate lock cylinder switch is actuated by the
key lock cylinder when the key is inserted in the lock
cylinder and turned to the lock or unlock positions.
The liftgate lock cylinder switch closes a path to
ground through one of three internal resistors for the
CTM when the liftgate key lock cylinder is in the
lock, unlock or neutral positions. The CTM reads the
switch status through an internal pull-up, then uses
this input and its internal programming to control
the proper Vehicle Theft Security System (VTSS) and
power lock system outputs.
HEADLAMP RELAY
The headlamp (or security) relay is a International
Standards Organization (ISO) micro-relay. The termi-
nal designations and functions are the same as a con-
ventional ISO relay.
terminal orientation (or footprint) is different, cur-
rent capacity is lower, and the relay case dimensions
are smaller than those of the conventional ISO relay.
The headlamp relay is a electromechanical device
that switches battery current to the headlamps when
the high-line Central Timer Module (CTM) grounds
the relay coil. See Headlamp Relay in the Diagnosis
and Testing section of this group for more informa-
tion.
The headlamp relay is located in the Power Distri-
bution Center (PDC), behind the battery on the left
side of the engine compartment.
The headlamp relay cannot be repaired and, if
faulty or damaged, it must be replaced.
8Q - 3
However, the micro-relay