#2001 silverado pcm how to#
#2001 silverado pcm serial#

Most trucks will require all 3 cycles for learning the password. Perform all 3 cycles if the car will not start after 1 cycle. NOTE: For most cars, one 10-minute cycle will be enough for the vehicle to learn the new password. Vehicle has now learned the new password.Turn ignition to the вЂњOFFвЂќ position, and wait 10.Observe the вЂњSECURITYвЂќ indicator After 10 minutes the вЂњSECURITYвЂќ indicator light will turn off.Attempt to start the engine, and then release the key to the вЂњONвЂќ.Connect a battery charger to the battery to ensure power is available while programming.Д«oth the IPC/BCM and PCM must be working and communicating with each other. The battery will be used for 30 minutes without the alternator available for charging. To perform a relearn on a Passlock system, make sure there is a fully charged battery in the vehicle.

#2001 silverado pcm serial#

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. The cylinder then sends a coded signal to the instrument panel cluster (IPC) or body control module BCM. When the key is turned in the lock cylinder, the magnet creates a signal on the Hall effect sensor. The lock cylinder contains a stationary Hall effect sensor and a rotating magnet. The Passlock anti-theft system requires the presence of a key in the lock cylinder to enable starting. If the engine starts and runs, the relearn is complete.

Turn the ignition switch to the вЂњONвЂќ position for 30.

Turn the ignition switch to the вЂњOFFвЂќ position for 30 seconds for a third.

Turn the ignition switch to the вЂњONвЂќ position as in Step 1 for 11 minutes for a third.

Turn the ignition switch to the вЂњONвЂќ position as in Step 1 for 11.

Turn the ignition switch to the вЂњOFFвЂќ position for 30.

Do not proceed to Step 2 until the security light turns off or stops The security light will be steady on or flashing for the 11-minute period. Leave the key in the вЂњONвЂќ position for approximately 11 minutes.

Insert ignition key and turn to the вЂњONвЂќ position.

Both the BCM and PCM must be working and communicating with each other. Connect a battery charger to the battery to ensure power is available while programming. To perform a relearn on a Passkey II system, make sure there is a fully charged battery in the vehicle. 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. The TDM portion of the BCM will validate the resistive chip in the ignition key. Passkey II вЂ“ The Passkey II system has the Theft Deterrent Module (TDM) function stored in the Body Control Module (BCM). No relearn is required on a Passkey equipped vehicle when replacing the PCM. 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. Passkey вЂ“ The Passkey system has a separate module called the Theft Deterrent Module (TDM) that validates the resistive chip in the ignition key. No relearn is required on a VATS equipped vehicle when replacing the PCM. Vehicle Anti-Theft System (VATS) вЂ“ VATS has a separate module called the Theft Deterrent Module (TDM) that validates the resistive chip in the ignition key. VATS, Passkey, & Passkey II вЂ“ resistive chip ignition key

#2001 silverado pcm how to#

The sections that follow will help you identify the system and describe how to do the relearn. How do you know what system your vehicle has? Just look at the keys (see page 4). Vehicle Anti-Theft System (VATS), Passkey, & Passkey II вЂ“ resistive chip ignition key Unless these procedures are correctly performed the vehicle will not start after the PCM has been replaced. GM vehicles have three types of Vehicle Thief Deterrent (VTD) systems, each requiring their own set of relearn procedures.