Remote RF Keyless Entry

Remote RF (Keyless) Entry












The E46 keyless entry system's operation is carried over from the E38/E39. A minor change occurred with the location of the FZV receiver module location.

- The remote key receiver is part of the antenna amplifier and is installed in the left "C" pillar.
The receiver produces a digital signal based on the transmitter command and sends it to the GM for processing.
The GM then carries out all remote lock system, window/sunroof convenience closing features and DWA arming/disarming functions.
- The frequency at which the key transmits the radio signal to the antenna amplifier is 315 MHz.
- The system is also used to convey the key identification number being used to lock/unlock the vehicle. This is a requirement of the Key Memory feature covered further on in this manual.












Features of the keyless entry system include:

- Locking/unlocking of doors, trunk, fuel filler lid.
- Selective unlocking of driver's door (as with key in lock)
- Arming/dis-arming of DWA alarm system (if equipped).
- Remote unlocking of the trunk only.
- Comfort opening of windows and sunroof
- Interior lighting activation (search mode).
- Panic mode alarm activation (if equipped).
- Automatic correction for up to 1000 erroneous activation signals.
- Low transmitter battery fault code storage in the GM.
- 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 key incorporates an LED that signals the operator of signal transmitting, key initialization status and key self test indication.
- The keys are now delivered with a four color label sheet containing four different colored labels for each of the four possible FZV keys.

This is a helpful addition to differentiate the FZV keys during initialization preventing the possibility of mis-assigning the key ID which would change the encoded Key Memory functions.

Remote Key Initialization







The initialization of the FZV keys is required to establish the Lock/Unlock signal synchronization with the GM V The initialization procedure provides the GM with a key identification number and a "rolling code" for each key. If 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. 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.

Service 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

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.