Vehicle Theft Deterrent (VTD) Operation Domestic
The design of the passlock™ system is to prevent
the vehicle operation if the proper ignition key is not used in order to
start the vehicle. The mechanical key, in normal operation, will turn the
passlock™ lock cylinder. The passlock™ sensor will relay the
passlock™ data to the passlock™ module. The passlock™
module will determine the validity of the passlock™ data. The passlock™
module will send a code password to the vehicle/powertrain control module
(VCM/PCM). When the VCM/PCM receives the correct code the VCM/PCM allows
the fuel injectors to operate normally. The passlock™ system requires
the VCM/PCM and the passlock™ module to communicate the various functions
in order to operate. These functions transmit over the class 2 serial
data line CKT 1807. For an explanation of the class 2 serial
data operation refer to
Data Link Communications Circuit Description
in
Wiring Systems
Vehicle Theft Deterrent (VTD) Operation Export
Lock and Unlock Commands
The VIM contains a radio receiver which is synchronized with the transmitter
in the key fob (up to 4). The transmitter sends an RF signal with an identifier
consisting of the following codes and message:
| • | A fixed code--Sent in order to identify the fob as valid
for the vehicle. |
| • | A variable code--Used in order to prevent the transmitter
message from being recorded and to gain unauthorized access. |
| • | A message indicating the status of the LOCK/UNLOCK buttons--
Indicates the requested function (lock/unlock). |
The VIM will ignore received transmissions in the following situations:
| • | The fixed code portion of the identifier is not valid. |
| • | The message portion indicates both lock and unlock functions are
being requested. |
| • | The variable code portion of the identifier does not match the
value stored in the VIM. |
When the UNLOCK button on a valid fob is pressed once within a range
of the vehicle in a 15 second period and ignition 1 (start or
RUN) is not present at the VIM the following events occur:
| • | The left door is unlocked. |
| • | The following lamps flash once for 250 msec: |
| • | The front repeater lamps |
| • | The immobilization function will be disabled for 2 minutes
then enabled. Allow the engine to run. |
| • | The dome lamps and the courtesy lamps are illuminated for 40 seconds.
If a door is opened during the 40 second delay, the control is based
upon the door jamb switch input unless the dome lamp defeat switch is active. |
| | Whenever ignition 1 is detected at the VIM, the VIM will disable
the interior lights output unless the door jamb switch input indicates a door
is open. |
When the UNLOCK button on a valid fob is pressed twice within range
of the vehicle in a 15 second period and ignition 1 (START or
RUN) is not present at the VIM, the following events will occur:
| • | All events listed for a single button press. |
| • | The following doors are unlocked: |
| • | The cargo doors, if equipped |
When the UNLOCK button on a valid fob is pressed 3 times within
range of the vehicle in a 15 second period, ignition 1 (START
or RUN) is NOT present at the VIM, and the vehicle is in PARK or NEUTRAL the
following events will occur:
| • | All the events listed for a single button press. |
| • | All the events listed for the second button press. |
| • | The liftgate and dutch doors, if equipped are unlocked. |
When the LOCK button on a valid fob is pressed within range of the vehicle
the following events will occur:
| • | All the doors are locked. |
| | Note: If the side door is open at this time, the side door will not
lock until commanded to do so by the door lock control module. |
| • | The following lamps will flash 3 times: |
| • | The front repeater lamps |
| • | They are flashed ON for 250 msec and OFF for 100 msec. |
| • | The immobilization function is enabled without a time delay. |
| • | The dome lamps and courtesy lamps are illuminated for 2 seconds. |
| | Note: If any door is opened, the 2 second illuminate will delay
until all the doors are closed unless the dome lamp defeat switch is active. |
The VIM will also react to lock/unlock signals from the power door lock
switches. The circuits used by the VIM to lock/unlock the doors are also used
by the VIM in order to monitor the state of these circuits.
When the UNLOCK switch of any power door lock switch is activated the
following events will occur:
| • | All the doors are unlocked. |
| • | The following lamps are illuminated for 40 seconds: |
| • | If a door is opened during the 40 second delay, the control is
based upon the door jamb switch input unless the dome lamp defeat switch is
active. |
| • | Whenever ignition 1 is detected at the VIM, the VIM will
disable its interior lights output unless the door jamb switch input indicates
a door is open and the dome lamp defeat switch is not active. |
| • | The immobilizer function retains its subsequent status. |
When the LOCK switch of any power door lock switch is activated, the
following events will occur:
| • | All the doors are locked. |
| | Note: If the side door is opened at this time, the side door will not
lock until commanded to do so by the door lock control module. |
| • | The following lamps are illuminated for 2 seconds as long
ignition 1 is off and the door jamb switch input is not active: |
| • | The immobilizer function retains its subsequent status. |
