Workshop Hints

Workshop Hints

Remote Key Initialization: The initialization of the FZV keys is required to establish the Lock/Unlock signal synchronization with the GM. The initialization procedure provides the GM with a key identification number and a "rolling code" for each key. It the initialization is not performed, the GM will not respond to the key signals.

Up to 4 remote keys can be initialized. They must be initialized at the same time. Key initialization is only possible with the vehicle unlocked.

Procedure:
1. Close all doors and have all keys available.




2. Using key number 1, turn the ignition switch to KL R, then switch off within 5 seconds and remove the first key.
3. Within 30 seconds of turning the ignition switch to "off Press and hold button #2.




4. While holding button #2, press and release ("tap") button #1 three times within 10 seconds.
5. Release both buttons. The LED in the key will flash momentarily (except 2000 MY). The GM will immediately lock and unlock the doors signaling a successful initialization.
6. If additional keys need to be initialized repeat steps 3 - 5 within 30 seconds.
7. Switching the ignition to KL R completes the initialization.


NOTE: The key memory function of the GM responds to the key identification number of each key. If the keys are not initialized in the same order prior to initialization, the key memory functions activated by the keys will not be assigned correctly, Always initialize the keys in the same order.


LED Status (Keys equipped with LED):




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.

FZV Key Test: Pressing the trunk release and lock buttons together activates the key test. If the battery and FZV key EEPROM are "OK", the LED will come ON for approximately 1 second.

FZV Key Rechargeable Battery
From KL R, the battery inside the key head is charged inductively by the EWS ring antenna via a coil antenna integrated in the key. The charging process is controlled by electronic circuitry integrated in the key.

- The service life of a radio-control key used under normal conditions corresponds to the vehicle lifespan.
- If the FZV keys are not used (i.e: stored in a drawer), the battery will be discharged after approx. 1.5 years.
- The time required to fully charge a discharged battery is approx. 30 hours.
- The remote control can be operated about 15 times after a charging period of approx. 30 minutes (driving time).

The key data is stored in a transponder chip. The transponder chip is a wireless read and write EEPROM. It is powered via the ring coil at the steering lock. Power is applied electromagnetically when the key is in the ignition switch from KL R.

The power supply is used both for data transfer as well as for charging the battery. This has been made possible by new development of the transponder chip.

As with previous systems, every press of an FZV key also provides the battery charge condition. When the FZV electronics receives a low power condition message three successive times, the GM sets a fault indicating a low battery within a specific key The LCM is also informed via the bus system and alerts the driver via an instrument cluster matrix message.

If the battery is recharged (used operate car), the fault will be automatically deleted when five successive messages are received indicating a charged battery condition.




The battery has no affect on the EWS III communication function!