Passlock™ System
The design of the passlock™ system is to prevent vehicle theft
by disabling the engine unless the passlock™ lock cylinder rotates properly
by engaging the correct ignition key. The system is similar in concept
to the passkey system. However, the passlock™ eliminates the
need for a key mounted resistor pellet. The components of the system
are as follows:
• | The ignition lock cylinder |
• | The EVO/Passlock™ module |
• | The vehicle/powertrain control module (VCM/PCM) |
Ignition Lock Cylinder and Housing
The ignition lock cylinder is located at the upper right side of the
steering column. The Passlock™ sensor is in the steering column. The
Passlock™ sensor is separate from the key and lock cylinder. The
key and the lock cylinder work together in order to determine if the proper
ignition key was used to start the vehicle.
In the event of an open Class 2 serial data line between the
EVO/Passlock™ Module and the VCM/PCM, the vehicle will become fail-enabled
if the VCM/PCM has already received the password from the EVO/Passlock™
Module for that ignition cycle (the engine is running). In this event,
the following conditions occur:
• | The security telltale will be ON continuously. |
• | The VCM/PCM will become fail-enabled for future ignition cycles. |
If a failure in the Class 2 serial data line occurs before the
ignition cycle, when the VCM/PCM is not fail-enabled, the following conditions
occur:
• | The VCM/PCM will never receive a valid password in order to enable
the fuel injectors. |
• | The vehicle will not start. |
Ignition Switch
The lock cylinder and the visible key insert portion of the ignition
switch are located at the upper right side of the steering column. The electrical
switching portion of the assembly is separate from the key and lock
cylinder. The electrical switch portion is hidden inside the steering column.
The electrical switch portion and the key and lock cylinder synchronize
and work in conjunction through the action of the mechanical assembly between
the 2 parts.
Passlock™ Sensor
The passlock™ sensor is inside the upper right side of the steering
column. The passlock™ sensor contains 2 hall effect sensors.
The tamper hall effect sensor is on the top. The security hall effect
sensor is under the tamper hall effect sensor. Both of the hall effect
sensors monitor the magnet of the lock cylinder through an opening. The
tamper hall effect sensor is physically placed on top of the security
hall effect sensor. The placement enables the tamper hall effect sensor
to engage first if an intruder attempts to bypass the passlock™
sensor by placing a large magnet around that area of the steering column.
There is a tamper resistor inside the passlock™ sensor in order
to help prevent tamper to the system. Passlock™ equipped vehicles
have a selection of 10 different security resistors ranging up
to 13K ohms. Install any of the security resistors inside the
passlock™sensor in order to generate a unique passlock™
code. All 10 combinations of the passlock™ sensor have the
same part number. However, you cannot simply replace the passlock™
sensor and expect the system to operate properly. Always start by performing
the Diagnostic System Check first and following the instructions.
EVO/Passlock™ Module
The EVO/Passlock™ module contains the theft deterrent system logic.
The EVO/Passlock™ module reads the passlock™ data from the passlock™
sensor. If the passlock™ data is correct, the EVO/Passlock™
module will pass theft. The EVO/Passlock™ module will then transmit
the code password to the VCM/PCM.
During the tamper mode the vehicle may start. The vehicle will quickly
stall. If the EVO/Passlock™ module receives the wrong passlock™
data, the VTD will immediately go into the tamper mode. The tamper mode will
lock-out the vehicle fuel injectors for 10 minutes. The SECURITY
indicator will flash while the VTD is in the tamper mode.
If the passlock sensor sends a correct password to the EVO/Passlock
module when the ignition is in the ON position, the EVO/Passlock module
will send a fuel enable signal to the VCM/PCM. The VCM/PCM will not disable
the fuel due to any EVO/Passlock module message for the remainder
of the ignition cycle.
SECURITY Indicator
The SECURITY indicator is on the instrument cluster. If the SECURITY
indicator flashes or if the SECURITY indicator lights continuously during
the vehicle operation, refer to the system diagnosis.
Vehicle/Powertrain Control Module
The VCM/PCM communicates with the EVO/Passlock Module over the Class 2
serial data line. When the EVO/Passlock™ Module determines a no start
condition, it sends a Class 2 serial data password to the VCM/PCM
in order to disable the fuel injection system. If the EVO/Passlock™
Module receives the expected voltage from the Passlock™ sensor,
the EVO/Passlock™ Module sends a Class 2 serial data password
to the VCM/PCM in order to enable the fuel injection system. The VCM/PCM
then allows the vehicle to start correctly. If the Class 2 serial
data password from the EVO/Passlock™ Module to the VCM/PCM is not
within the Vehicle Security Status Message, the fuel injectors will shut
OFF during a start attempt. The SECURITY telltale will be ON STEADY for
approximately 10 minutes and then turns OFF. If the VCM/PCM does
not receive the same password from the EVO/Passlock™ Module as the
last learned one, the vehicle will start and quickly stalls due to the
Fuel Lockout.
Changing the Passlock™ Components
The design of the passlock™ system is to prevent theft even if
the various theft deterrent parts change. The parts that can no longer be
changed without the possibility of going into a tamper mode are:
• | The EVO/Passlock™ module |
If you replace any of these parts the vehicle may start and stall for
10 minutes. This is the long tamper mode. If this occurs, the system
must go through a long tamper mode cycle. During this time the SECURITY
indicator will be flashing for the full 10 minutes and the DTC B3031
will be set. The EVO/Passlock™ module and the VCM/PCM require the full
10 minutes in order to complete a learn cycle. The ignition switch
must remain in the RUN position until the SECURITY indicator stops flashing.
You will need to repeat the cycle if the ignition switch does not remain in
the RUN position. When replacing any of the above parts it is recommended
to perform one of the following procedures: