Passkey System
The personal automotive security system (PASS-Key®) is standard equipment on the vehicle. The system is designed to prevent vehicle theft by disabling the engine unless an ignition key with a specific electrical resistance is used in the ignition cylinder.
There are 15 different ignition key resistance values. Of the 15 different resistance values, or key codes available, only one will work with each instrument panel cluster (IPC). Once the key code is programmed into the IPC, the code is stored in non-volatile memory.
The PASS-Key® system prevents the engine from starting by controlling the theft deterrent relay and the powertrain control module (PCM) fuel enable input. If the PCM does not sense the proper fuel enable signal, fuel will not be provided to the engine.
If the wrong resistance value is sensed when the ignition switch is in the ON position, the PCM will not ground the theft deterrent relay control circuit and will not enable the fuel system for approximately three minutes. The engine is prevented from starting and discourages a thief from trying key codes or resistance values at random.
If the correct resistance value is sensed when the ignition switch is in the ON position, the PCM will ground the theft deterrent relay control circuit and enable fuel delivery. The engine will start normally.
If the PASS-Key® system detects an open or short to ground when the ignition switch is in the ON position, the IPC will default to fail enable mode. Fail enable occurs when the proper key resistance is sensed before the open short to ground occurs. Fail enable will illuminate the security indicator massage and allow the operator to stop and start the vehicle until the problem is corrected. The PASS-Key® system includes the following components:
| • | Ignition key |
| • | Ignition cylinder |
| • | Instrument Panel Cluster (IPC) |
| • | Theft deterrent relay |
| • | Powertrain Control Module (PCM) |
| • | SECURITY indicator |
Ignition Key
The ignition key is a typical square ignition key blank with an imbedded resistor. The key blank and resistor are not serviceable separately. There are 15 different resistance values. The ignition key also has mechanical cuts similar to non-PASS-Key® ignition keys.
Ignition Cylinder
The ignition cylinder contains a set of electrical contacts used to measure the resistor in the ignition key. When the ignition key is inserted into the lock cylinder, the resistor in the key makes contact with the electrical contacts inside the ignition cylinder.
Instrument Panel Cluster
The instrument panel cluster (IPC) contains the theft deterrent system logic. The IPC reads the key code from the ignition cylinder when the ignition is turned to the START position. If the code is correct, the IPC will send a meaasge to the PCM to enable the theft deterrent relay and the fuel system via class 2.
If the IPC receives the wrong code, the IPC will immediately go into tamper mode. The tamper mode will lock-out the vehicle starter and fuel injectors for 3 minutes. The SECURITY message will illuminate while the IPC is in tamper mode.
Theft Deterrent relay
The theft deterrent relay is used to prevent the engine from cranking if the correct resistance is not sensed at the ignition key. It prevents the engine from cranking by opening the circuit to the starter solenoid.
Powertrain Control Module
The PCM communicates with the IPC over the Class 2 serial data line. When the IPC enters tamper mode, it sends a Class 2 serial data signal to the PCM in order to disable the fuel injection system. If the IPC receives the expected ignition code, the IPCM sends a class 2 serial data signal to the PCM in order to enable the fuel injection system. The PCM then allows the vehicle to start.
SECURITY indicator
The SECURITY indicator is located on the instrument cluster message center.
Theft System Indicators
PROGRAM PASS KEY - 31
The IPC illuminates the PROGRAM PASS KEY - 31 indicator in the DIC when the IPC detects the ignition key pellet information has not been programed.
SECURITY
The vehicle theft deterrent (VTD) system utilizes the IPC to control the VTD functions. The IPC illuminates the SECURITY indicator when it detects a malfunction with the VTD system. The content theft deterrent (CTD) system utilizes the body control module (PZM) to control the VTD functions. The IPC receives a class 2 message from the PZM requesting illumination.
| • | The VTD system requests the IPC to illuminate the indicator only when the ignition switch is ON. The VTD system uses the indicator as a malfunction indicator. |
| • | The CTD system requests the IPC to illuminate the indicator only when the ignition switch is OFF. The CTD system uses the indicator in order to identify system status. |
| • | The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds. |
STARTING DISABLED REMOVE KEY - 33
The IPC illuminates the STARTING DISABLED/REMOVE KEY -- 33 indicator in the DIC when the powertrain control module (PCM) has not received a fuel enable signal from the IPC prior to an attempted vehicle start. The IPC receives a class 2 message from the PCM requesting illumination. After the ignition is cycled to OFF the IPC illuminates WAIT 3 MINUTES, WAIT 2 MINUETS, WAIT 1 MINUTE and than START CAR, REMOVE KEY in the DIC.
THEFT SYSTEM PROBLEM CAR MAY NOT RESTART - 34
The IPC illuminates the THEFT SYSTEM PROBLEM CAR MAY NOT RESTART - 34 indicator in the DIC when the IPC detects a theft system malfunction well the engine is running. The vehicle will continue to run but may not restart if the malfunction is still present when engine is turned OFF.
