Pass-Key(R) Time-Out

When the PASS-Key(R) system detects an invalid key, the PASS-Key(R) system disables cranking and fuel enable for a time-out period of approximately 3 minutes. If a key is inserted or the ignition is turned ON before the 3 minute time-out is complete, the timer will reset to 3 minutes. Disconnecting the battery or pulling fuses will not disable the time-out; the BCM stores the PASS-Key(R) state in EEPROM, and will restart the minute timer when the battery is reconnected. Even if the proper resistance key is inserted during the time-out the vehicle will not start until the total time period has expired.

Fuel Enable
The BCM and PCM operate in conjunction with each other to determine fuel enable. The fuel enable system uses a password exchange between the BCM and PCM after a correct PASS-Key(R) has been sampled by the BCM. The serial data line is used to communicate this password information from the BCM to the PCM. When the BCM stored password, is sent to the PCM over the serial data line, the PCM checks if the password matches its own stored password. If the password matches, the PCM will enable fuel delivery. If the password does not match, the PCM will disable fuel delivery and store a DTC.