Dodge Ram 2004, Service Manual

Page: 31 / 642

• Arm the Vehicle Theft Security System (if
equipped and all conditions are met).
• Turn off the illuminated entry feature.
• Activate the door lock motors.
•
Transmit a PCI bus message to the FCM to
perform horn chirp.
When a valid unlock code is received from the
receiver, the instrument cluster will:
• Disarm the Vehicle Theft Security System (if
equipped and previously set).
•
Activate the illuminated entry and cargo lamp.
• Activate the driver door unlock motor (if cus-
tomer programmed for driver door only unlock).
• Transmit a PCI bus message to the FCM for
optical chirp.
3.14 TELECOMMUNICATIONS
3.14.1 HANDS FREE PHONE
OVERVIEW
The vehicle telecommunications system consists
of a Hands Free Module, Rear view Mirror, and a
Blue-tooth Hands Free Profile enabled cell phone.
The system allows vehicle occupants to use voice
recognition technology to make, receive and screen
phone calls without physically handling a cell
phone. The system has a programmable phone book
that can prevent the vehicle operator from becom-
ing distracted searching for a specific number.
Seven different wireless phones can be pro-
grammed to operate each individual system. Each
of the seven phones is given a rank of priority when
programmed.
OPERATION
Incoming phone messages are transmitted to the
vehicle occupants through the vehicles audio sys-
tem when the ignition is on and the wireless phone
is on. Upon receiving the signal from an incoming
phone call, the vehicle audio system will fade out
the current CD/DVD or radio output. The vehicle
occupants are then directed to accept or reject the
call. Outgoing audio messages are received through
the microphone located in the rearview mirror then
transmitted via hardwire to the Hands Free Module
and finally transmitted through the wireless phone.
Volume of the voice prompts and incoming conver-
sation is controlled using the vehicles’ radio audio
controls and steering wheel controls if equipped.
The rearview mirror contains a Phone Switch, Voice
Recognition Switch and a microphone. The rear
view mirror transmits these inputs via hardwired
circuits to the Hands Free Module.
3.15 VEHICLE THEFT SECURITY SYSTEM
The Instrument Cluster controls the Vehicle
Theft Security System (VTSS). When the VTSS is
armed it will monitor the status of the ignition and
door ajar switches. If the alarm is tripped it will
sound the vehicles horn, flash the exterior lamps
and the VTSS indicator located in the instrument
cluster.
The Instrument Cluster will enable the VTSS
feature once it has received PCI bus messages from
the Sentry Key Immobilizer Module and has also
detected the driver cylinder lock switch being cycled
to the lock/unlock position.
Arming the system is accomplished following a
normal exit sequence of removing the key from the
ignition, opening the door pressing the power lock
button to lock and closing the door, by using a
cylinder lock switch or by pressing the RKE lock
button. After all the doors are closed, the VTSS
indicator will flash quickly for sixteen-seconds in-
dicating the pre-arm process, after which it will
flash at a slower rate indicating the system is
armed. If during the pre-arm process a door is
opened, the ignition is turned to the Run/Start
position or if a RKE unlock button is pressed the
system will exit the pre-arming process.
Disarming can be accomplished with a RKE un-
lock, turning the ignition on with a valid Sentry key
or unlocking the vehicle with a cylinder lock switch.
The Alarming state will last for 18 minutes after
which it will timeout and return to the armed state.
A tamper alert feature will alert the customer to the
alarm being tripped while they were away upon
returning to the vehicle by flashing the VTSS
indicator for 30 seconds after the system has been
disarmed.
All of the switches for the VTSS system can be
monitored using the DRBIII
t
. The DRBIII
t
is also
useful for a customer complaint of the alarm going
off with no apparent reason by viewing the VTSS
last alarm caused by display.
3.16 WINDSHIELD WIPERS/WASHERS
The Instrument Cluster controls the wiper/
washer system. The instrument cluster receives a
signal from the Multifunction Switch wipe position.
The instrument cluster sends the message to the
Front Control Module (FCM), sending the com-
mand to turn the wiper/washers on. Two relays, the
High/Low relay and the On/Off relay also control
the wipers. Both are located in the PDC or Inte-
grated Power Module.
17
GENERAL INFORMATION