Keyless Entry: Description and Operation

REMOTE KEYLESS ENTRY (FZV)







Minor changes have occurred to the Remote Keyless Entry System (FZV) for the 1997 model year. These changes include:
- An LED is re-integrated in the transmitter keys.
- A new style, single, 3 volt lithium battery (commercially available CR 2016) is used as the power supply for the key transmitters.
- An EEPROM is used to store the key data. The data is no longer lost when the battery is replaced and initialization is not required.

The basic operation of the system remains the same in regards to features and functions. Signals from the remote transmitters are converted by the receiver module and passed to the GM where the control electronics for the FZV are located.

All commands for Locking/ Unlocking are processed by the GM and carried out by the respective control modules.

The LED gives a visual indication that the signal was transmitted when using the remote key. The following functions can be checked with the LED:
- Flashing LED when pressing a button. Indicates that the data is being transmitted. (battery voltage between 3.2 - 2.6 volts)
- No LED activity when pressing a button:
1. ZKE responds to pressed button only to unlock a locked vehicle. Indicates the battery is between 2.6 - 2.2 volts. Replace battery.
2. No unlock of vehicle. Indicates battery is below 2.2 volts. Replace battery.

KEY TEST - Pressing the trunk release and lock buttons together will activate the key test. If the battery and EEPROM are "OK", the LED will come ON for approximately 1 second.