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Passive Anti-Theft System (PATS) PIDs

Monitoring the PATS  PIDs can be very useful in determining which diagnostic steps to follow. Viewing the MASTERKEY (verifies if the key is programmed) PID (with both keys) will determine if the key is a programmed key and will also prove out the transceiver, circuitry and the IC  . A master key is any key that is programmed into the IC  . Viewing the MIN_KEY (minimum number of keys) PID (this PID does not change) indicates the minimum number of keys that must be programmed into the IC  in order for the vehicle to start. There must be at least 2 keys programmed into the IC  type of PATS  before the vehicle will start. Viewing the N_KEYCODE (number of keys programmed) PID will determine if the minimum number of keys has been programmed into the IC  . If the N_KEYCODE PID reads 0 or 1, additional key(s) will need to be programmed into the IC  in order to meet the minimum of 2 keys. If the N_KEYCODE PID reads 0 or 1, and the MASTERKEY PID reads NOTPREST, that particular key must be programmed into the IC  . If the N_KEYCODE PID reads 1, and the MASTERKEY PID reads PRESNT, that particular key is already programmed into the IC  . The SPAREKEY (spare key) PID is defaulted to ENABLE.

When the parameters in the IC  are reset, it clears (erases) the PCM ID from the IC  . A PCM parameter reset will cause the PCM to send a PCM ID to the IC  that is necessary for the system to operate. Make sure to cycle the key at least once, then turn the key ON and make an attempt to start the vehicle for 3-5 seconds before attempting more procedures. If only a PCM parameter reset occurs, the ID stored in the IC  will not match the ID being sent by the PCM, and may cause a PATS  -related no-start. Carry out the parameter reset, and do not cycle the key until after the parameter reset selection has been highlighted, and all of the following IDS  screens have been completed. The IDS will then reset the parameters in both the IC  and the PCM at the same time.

If the PCMID reads STORED, the IC  has a PCM ID stored. If it reads NOTSTRD, a parameter reset should resolve this concern. If the PCMVER PID (PCM verify) reads NO, the N_KEYCODE PID reads 2 or more and the MASTERKEY PID reads PRESNT, the IC  , and the PCM will need to have their parameters reset. Refer to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET .

If the PCM_VFY PID reads NO, the N_KEYCODE PID reads 1 and the MASTERKEY PID reads PRESNT, or if the N_KEYCODE PID reads 0 and the MASTERKEY PID reads NOTPRESNT, a minimum of 2 keys will need to be programmed into the IC  . Refer to INTEGRATED KEYHEAD TRANSMITTER (IKT) KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT .

The SPAREKEY PID is defaulted to ENABLE. With the SPAREKEY PID displaying ENABLE, the IC  will accept more than 2 keys (up to a maximum of 8) being programmed into the IC  using the Key Programming Using Two Programmed Keys procedure. The SPAREKEY PID can be toggled to DISABL if the customer wants to disable the customer spare key programming function. To enable or disable the spare key feature, refer to the KEY PROGRAMMING SWITCH STATE CONTROL . This switch state control does not affect the Integrated Keyhead Transmitter (IKT) Key Programming Using Diagnostic Equipment procedure.

In summary, for the PATS  PIDs and their correct state in order for the vehicle to start:

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