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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.
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Connect a battery charger to the battery to ensure power is available while programming. The battery will be used for 30 minutes without the alternator available for charging. To perform a relearn on a Passkey II system, make sure there is a fully charged battery in the vehicle.
#Obdwiz add on key serial
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 – The Passkey II system has the Theft Deterrent Module (TDM) function stored in the Body Control Module (BCM).
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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 – The Passkey system has a separate module called the Theft Deterrent Module (TDM) that validates the resistive chip in the ignition key.
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No relearn is required on a VATS equipped vehicle when replacing the PCM. 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. VATS, Passkey, & Passkey II – resistive chip ignition key
#Obdwiz add on key 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 – 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.