CARDONE 2F54 Protech GM Vehicle Theft Deterrent Instruction Manual
- June 5, 2024
- CARDONE
Table of Contents
CARDONE 2F54 Protech GM Vehicle Theft Deterrent
GM Vehicle Theft Deterrent (VTD) Relearn Procedures
GM vehicles have three types of Vehicle Thief Deterrent (VTD) systems, each
requiring their own set of relearn procedures. Unless these procedures are
correctly performed the vehicle will not start after the PCM has been
replaced. The three systems are:
Vehicle Anti-Theft System (VATS), Passkey, & Passkey II – resistive chip
ignition key
Passlock – coded lock cylinder
Passkey III – transponder ignition key
How do you know what system your vehicle has? Just look at the keys (see page
4). The sections that follow will help you identify the system and describe
how to do the relearn.
VATS, Passkey, & Passkey II – resistive chip ignition key
Vehicle Anti-Theft System (VATS) – VATS has a separate module called the
Theft Deterrent Module (TDM) that validates the resistive chip in the ignition
key. If the resistance value read by the TDM is what the TDM is expecting, the
TDM will send a signal to the PCM informing the PCM that a valid key is
present and the PCM may start the vehicle. No relearn is required on a VATS
equipped vehicle when replacing the PCM.
Passkey – The Passkey system has a separate module called the Theft Deterrent
Module (TDM) that validates the resistive chip in the ignition key. If the
resistance value read by the TDM is what the TDM is expecting, the TDM will
send a signal to the PCM informing the PCM that a valid key is present and the
PCM may start the vehicle. No relearn is required on a Passkey-equipped
vehicle when replacing the PCM.
Passkey II – The Passkey II system has the Theft Deterrent Module (TDM)
function stored in the Body Control Module (BCM). The TDM portion of the BCM
will validate the resistive chip in the ignition key. If resistance value read
by the BCM is what the BCM is expecting, the BCM will send a message over
serial data to the PCM informing the PCM that a valid key is present and the
PCM may start the vehicle.
To perform a relearn on a Passkey II system, make sure there is a fully
charged battery in the vehicle. The battery will be used for 30 minutes
without the alternator available for charging. Connect a battery charger to
the battery to ensure power is available while programming. Both the BCM and
PCM must be working and communicating with each other.
- Insert ignition key and turn to the “ON” position. Do not attempt to start the engine. Leave the key in the “ON” position for approximately 11 minutes. The security light will be steady on or flashing for the 11-minute period. Do not proceed to Step 2 until the security light turns off or stops flashing.
- Turn the ignition switch to the “OFF” position for 30 seconds.
- Turn the ignition switch to the “ON” position as in Step 1 for 11 minutes.
- Turn the ignition switch to the “OFF” position for 30 seconds.
- Turn the ignition switch to the “ON” position as in Step 1 for 11 minutes for a third time.
- Turn the ignition switch to the “OFF” position for 30 seconds for a third time.
- Turn the ignition switch to the “ON” position for 30 seconds.
- Turn the ignition switch to the “OFF” position.
- Attempt to start the engine.
If the engine starts and runs, the relearn is complete.
Passlock – coded lock cylinder
The Passlock anti-theft system requires the presence of a key in the lock
cylinder to enable starting. The lock cylinder contains a stationary Hall
effect sensor and a rotating magnet. When the key is turned in the lock
cylinder, the magnet creates a signal on the Hall effect sensor. The cylinder
then sends a coded signal to the instrument panel cluster (IPC) or body
control module BCM. If the IPC/BCM receives the expected coded signal, the
IPC/BCM will send a message over serial data to inform the PCM that the
vehicle may be started.
To perform a relearn on a Passlock system, make sure there is a fully charged
battery in the vehicle. The battery will be used for 30 minutes without the
alternator available for charging. Connect a battery charger to the battery to
ensure power is available while programming.
Both the IPC/BCM and PCM must be working and communicating with each
other.
- Turn ignition on.
- Attempt to start the engine, and then release the key to the “ON” position.
- Observe the “SECURITY” indicator light. After 10 minutes the “SECURITY” indicator light will turn off.
- Turn ignition to the “OFF” position, and wait 10 seconds.
- Attempt to start the engine, and then release the key to the “ON” position.
- Observe the “SECURITY” indicator light. After 10 minutes the “SECURITY” indicator light will turn off.
- Turn ignition to the “OFF” position, and wait 10 seconds.
- Attempt to start the engine, and then release the key to the “ON” position.
- Observe the “SECURITY” indicator light. After 10 minutes the “SECURITY” indicator light will turn off.
- Turn ignition to the “OFF” position, and wait 10 seconds.
- Vehicle has now learned the new password. Start the engine.
- With a scan tool, clear any trouble codes.
NOTE: For most cars, one 10-minute cycle will be enough for the vehicle to learn the new password. Perform all 3 cycles if the car will not start after 1 cycle. Most trucks will require all 3 cycles for learning the password.
Passkey III – transponder ignition key
The Passkey III anti-theft system uses a transponder inside the head of the
ignition key. The exciter inside the ignition lock cylinder energizes this
transponder when the ignition switch is turned on. The transponder transmits a
unique signature to the theft deterrent control module. If the key signature
transmitted is acceptable to the theft deterrent control module, the theft
deterrent control module will transmit fuel enable password to the PCM. If the
fuel enable password is correct, the PCM will start the vehicle.
To perform a relearn on a Passkey III system, make sure there is a fully
charged battery in the vehicle. The battery will be used for 30 minutes
without the alternator available for charging. Connect a battery charger to
the battery to ensure power is available while programming. When performing
this relearn, all previously learned keys will be erased. Additional keys may
be relearned immediately after the first key has been learned by inserting the
additional key and turning the ignition switch to on within 10 seconds of
removing the previously learned key.
- Insert a master key (black head) into the ignition switch.
- Turn key to the “ON” position without starting the engine. Security light should turn on and stay on.
- Wait for 10 minutes or until the security light turns off.
- Turn key to the “OFF” position for 5 seconds.
- Turn key to the “ON” position without starting the engine. Security light should turn on and stay on.
- Wait for 10 minutes or until the security light turns off.
- Turn key to the “OFF” position for 5 seconds.
- Turn key to the “ON” position without starting the engine. Security light should turn on and stay on.
- Wait for 10 minutes or until the security light turns off.
- Turn key to the “OFF” position. The key transponder information will be learned on the next start cycle.
- Start the vehicle. If the vehicle starts and runs normally, the relearn is complete. If additional keys need to be relearned:
- Turn the key to the “OFF” position.
- Insert the next key to be learned. Turn the key to the “ON” position within 10 seconds of removing the previously used key.
- Wait for security light to turn off. It should happen fairly quickly. You may not notice the lamp, as the transponder value will be learned immediately
- Repeat steps 12 through 14 for any additional keys.
How to tell which system you have – Look at the keys. VATS is not shown,
but very similar to Passkey and Passkey II.
NOTE : IF the theft deterrent relearn procedure does not work, please try the procedure again, before calling Technical Services.
GM Crankshaft Position Sensor Relearn
The PCM needs to learn the variability of the Crankshaft Position Sensor to better detect misfire conditions. Whenever the PCM is replaced, the Crankshaft Position Sensor Relearn procedure needs to be completed. The Crankshaft Position Sensor Relearn procedure requires the use of a scan tool that has this feature equipped. The scan tool will walk the installer through the procedure. Some of the steps to be expected are:
- Block drive wheels
- Apply parking brakes
- Cycling ignition on and off
- Apply and hold brake pedal. Note: Some applications will be instructed NOT to hold brake pedal. Follow instructions on scan tool.
- Start engine
- Turn off A/C
- Place transmission in Park (automatic) or Neutral (manual)
- Increase engine RPM to value indicated on scan tool
- Release throttle when fuel cut-off occurs or if RPM value is exceeded.
These are example steps, and not in any order. This information can also be found in ProTech 70-77-0003.
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