Content Theft Deterrent (CTD) Description and Operation
When armed, the content theft deterrent system is designed to
deter vehicle content theft by pulsing the horns and exterior lamps
for approximately 30 seconds when an unauthorized vehicle entry is
detected. However, the content theft deterrent system does not
affect engine starting.
An unauthorized entry can be any of the following with the
content theft deterrent system armed:
• |
Unauthorized entry into the
underhood area |
• |
Unauthorized entry into the
rear compartment |
• |
When any door is opened
without using the UNLOCK command from a keyless entry
transmitter |
• |
After a battery reconnect, if
the battery was disconnected with the content theft deterrent
system armed |
The components of the content theft deterrent system are:
• |
Body Control Module
(BCM) |
• |
Remote function receiver
module/Remote control door lock receiver |
• |
Rear Compartment Ajar
Switch |
Arming the Content Theft Deterrent System
Use the following procedure in order to arm the system:
1. |
Place the shift lever in P
(park). |
2. |
Turn OFF the ignition.
|
|
Note: The system is
not armed if the doors are locked manually; the power door lock
switch or remote keyless entry transmitter must be used to arm the
content theft deterrent system.
|
4. |
Lock the doors with the power
door lock switch or the LOCK button on the transmitter. The system
is in standby mode and will not start the arming timer until all
doors are closed. |
5. |
The system will begin the arm
sequence immediately after the last door is closed. If the keyless
entry transmitter is used the arm the system after the vehicle
doors are closed, the arm sequence will begin as soon as the LOCK
command is received by the transmitter. |
6. |
Double clicking the LOCK
command on the keyless entry transmitter will bypass the delayed
arming function and force the system to arm. |
7. |
If the vehicle is equipped
with passive locks, the vehicle will start the arming sequence when
a keyless entry transmitter is no longer detected. |
Locking the Vehicle Without Arming the Content Theft Deterrent
System
Locking the vehicle may be accomplished without arming the
content theft deterrent system. Use of the manual door locks or
using the key to lock the doors will lock the vehicle, but will not
arm the content theft deterrent system.
Disarming an Armed System/Silencing an Alarm
If system arming has been requested by the power door lock
switch or the keyless entry transmitter, it must be disarmed.
Note: Disconnecting the
battery or pulling fuses does not disable the arm mode, since the
BCM stores the content theft deterrent mode status in memory.
• |
To disarm the content theft
deterrent system in standby mode, perform one of the
following: |
|
- |
Press either
power door unlock switch. |
|
- |
Press the UNLOCK
button on the keyless entry transmitter. |
|
- |
Insert a valid
key into the ignition and switch to the ON position. |
• |
To disarm the content theft
deterrent system in the armed mode (non-event) or when activated
(during an alarm event): |
|
- |
Press the UNLOCK
button on the keyless entry transmitter. |
|
- |
Insert a valid
key into the ignition and switch to the ON position |
Content Theft Deterrent Circuit Description
The following is a description of each component used in the
content theft deterrent system:
Body Control Module
The content theft deterrent system is an internal function of the
BCM which utilizes serial data and various switch inputs
information to perform content theft deterrent functions. When the
BCM detects an unauthorized entry, it activates the horns and
exterior lamps. The BCM has 4 basic modes (disarmed, standby,
armed, and alarm) for operating the content theft deterrent system.
The different modes are described below.
1. |
The BCM has the content theft
deterrent system in a disarmed mode until the following conditions
are detected: |
|
• |
Ignition key turned to the OFF
position. |
|
• |
Doors locked by either the
power door lock switch or the LOCK button on the
transmitter. |
2. |
The BCM enters the standby
mode when the above conditions are detected. If a door was already
opened when the arm mode was requested, the standby mode does not
start the timer until the last door is closed. |
3. |
When the last door is closed,
a 15 second timer is activated. Once the timer has expired, the BCM
enters the armed mode. After this delay, any forced entry activates
the alarm mode. |
4. |
When the BCM detects a forced
entry, the BCM enters the alarm mode. The BCM activates the horns
and exterior lamps for 30 seconds. This is followed by a three
minute time-out with the horn no longer active. If no new
intrusions are detected after the time-out, the horn is not active.
The system must be disarmed or the intrusion condition removed
after the time-out for the system to exit alarm mode. |
Remote Function Receiver Module/Remote Control Door Lock
Receiver
The keyless entry system can arm and disarm the content theft
deterrent system. When the keyless entry module receives a door
lock or unlock signal from the transmitter, the keyless entry
module sends a message to the BCM via serial data to perform the
appropriate arm/disarm functions.
Security Indicator
The security LED is illuminated on the upper I/P by the BCM. The
content theft deterrent system uses the security LED to inform the
driver of system status prior to arming.
Door Ajar Switches
The content theft deterrent system uses the door ajar switches as a
status indicator to activate the alarm. The door ajar switches are
monitored by the body control module via a discrete input from each
door ajar switch. If the BCM receives a signal indicating a door is
opened when the content theft deterrent system is armed, the BCM
activates the alarm.
Hood Ajar Switch
The content theft deterrent system uses the hood ajar switch as a
status indicator to activate the alarm. The BCM monitors the hood
ajar switch via a discrete input from the switch. If the BCM
receives a signal indicating the hood has been opened when the
content theft deterrent system is armed, the BCM activates the
alarm.
Rear Compartment Ajar Switch
The content theft deterrent system uses the rear compartment ajar
switch as a status indicator to activate the alarm. The BCM
monitors the rear compartment ajar switch via a discrete input from
the switch. If the BCM receives a signal indicating the rear
compartment has been opened when content theft deterrent system is
armed, the BCM activates the alarm.
Inputs
The BCM monitors the following inputs for content theft deterrent:
• |
The keyless entry transmitter
LOCK/UNLOCK buttons; a message from the Remote function receiver
module/Remote control door lock receiver |
• |
The immobilizer status-The BCM
uses the immobilizer status for disarming the system or silencing
an alarm when the correct vehicle key is used to start the
vehicle |
• |
The rear compartment ajar
switch |
Outputs
The BCM controls the following for content theft deterrent:
|