PASSLOCK System Components
PASSLOCK(TM) Lock CylinderPasslock - Lock Cylinder:
The Passlock (TM) Lock Cylinder is a locking cylinder that turns a rotating magnet past a stationary hall effect sensor creating a Resistance Code (R-Code) which is sent to the Instrument Panel Cluster (IPC). The Passlock (TM) Lock Cylinder is interfaced with the IPC via a three wire connection (power, ground and data).
Ignition Switch
The mechanical key and lock cylinder is located in the steering column assembly on the right-hand side, just below the steering wheel. The Ignition Switch is located below the left-hand side of the steering column. The electrical switching portion of the assembly is separate from the key and lock cylinder. However, both are synchronized and work in conjunction through the action of the actuator rod assembly. The Ignition Switch pulls CKT 1350 low (to ground, 0 Volts) while the Ignition Switch is in "START." This is called the Cranklow Signal. The Cranklow input signal allows the IPC to start a timing window during which the Passlock (TM) Lock Cylinder must transmit the correct R-Code.
Instrument Panel Cluster (IPC)
Instrument Panel Cluster (IPC):
Instrument Panel Cluster (IPC):
The Vehicle Theft Deterrent's logic is contained within the Instrument Panel Cluster (IPC). The IPC will read an R-Code from the Passlock (TM) Lock Cylinder within a certain timing window. If the R-Code is correct and within the timed window, the IPC will PASS THEFT and will transmit it's coded password to the Powertrain Control Module (PCM). There are two ways the IPC may enter a theft mode; a bad timing cycle, or a bad R-Code.
If the R-Code is not read within the window, the Vehicle Theft Deterrent will go into a SHORT TAMPER MODE during which the it will not allow the car to operate for four (4) seconds and the telltale will flash. After three (3) consecutive failed timings, the Vehicle Theft Deterrent (VTD) will go into it's LONG TAMPER MODE. In this mode, the telltale will flash and the Fuel Injectors will be shut off for approximate ten (10) minutes . Please note, before ANY TAMPER MODE the vehicle may start; however the car will quickly stall. If the IPC receives the wrong R-Code, the VTD will immediately go into it's LONG TAMPER MODE in which the vehicle's fuel injection will be locked-out for ten (10) minutes as described above.
The THEFT SYSTEM Telltale will flash while the VTD is in ANY TAMPER MODE. The IPC continually checks the operation of the VTD during the operation of the vehicle.
Powertrain Control Module (PCM)
Powertrain Control Module (PCM) (RH Front Corner Behind Fascia):
The Powertrain Control Module (PCM) communicates with the IPC via serial data over the UART SERIAL DATA BUS, CKT 800. When the IPC has determined a PASSED-THEFT condition, it sends a coded password to the PCM. Upon receipt of the correct password, the PCM enables the fuel injection system, allowing the vehicle to operate correctly. Please note, the PCM may allow the car to start and quickly stall during a FAILED-THEFT condition.
There are two ways the PCM may enter a TAMPER MODE; a bad timing cycle, or an incorrect password. If a password is not received from the WC within a preset time window, the PCM will enter a SHORT TAMPER MODE during which the PCM will not allow the car to operate for four (4) seconds. If the password is incorrect, the PCM will enter the LONG TAMPER MODE. In this mode, telltale will flash and the Fuel Injectors will be shut off for approximately ten (10) minutes. Again, the vehicle may start, but the engine will quickly stall due to fuel cut-off.
In the event of an open in serial data between the IPC and the PCM, the PCM will become fail-enabled if the car has already passed theft for that ignition cycle (i.e. the engine is running). In this event, the THEFT SYSTEM telltale will light continuously and the PCM will become fail-enabled for future ignition cycles. If a failure in serial data occurs before the ignition cycle, when the PCM is not fail-enabled, the PCM will never receive a valid password to enable continued use of the Fuel Injectors.