GF80.20-P-2002GM Operating Central Locking With Transmitter Key, Function

GF80.20-P-2002GM Operating Central Locking With Transmitter Key, Function

General function requirements
^ C. 15C OFF

Central locking (CL) operation with transmitter key, function, general
The CL can be operated with the transmitter key (A8/1).

The operation of the transmitter key comprises the following partial functions:
^ Function sequence for presetting global and selective unlocking
^ Function sequence for locking or unlocking
^ Function sequence for visual feedback (without code (494) USA version)

Function sequence for presetting global and selective unlocking
If the unlock and lock buttons on the transmitter key are pressed simultaneously for 5 seconds, a change between the "global" and "selective" settings takes place. The indicator lamp on the transmitter key comes on twice for confirmation.

^ Global unlocking
The entire vehicle is unlocked by pressing the "Unlock" button on the transmitter key.
^ Selective unlocking
Only the driver door and the fuel filler flap are unlocked when the "Unlock" button on the transmitter key is pressed once. The next actuation unlocks the entire vehicle.

Function sequence for locking or unlocking
When the lock or unlock button on the transmitter key is actuated, it transmits a radio signal via the roof antenna module (A2/93) to the rear SAM control unit (N10/8). This relays the signal to the EIS control unit (N73) via interior CAN.
An infrared signal is transmitted to the left front IR receiver (A26/1) parallel to the radio signal (precise aiming required). This signal is read in by the left front door control unit (N69/1) and transmitted to the EIS control unit via the interior CAN..

The infrared and radio signals include the same information (redundant); the first signal received is accepted.

In both cases, the EIS control unit checks the access authorization of the transmitter key. If the access authorization is valid, the EIS control unit transmits the locking command via the interior CAN to the:
- Front SAM control unit (N10)
- Rear SAM control unit
- Door control module front left
- Right front door control unit (N69/2)

They unlock or lock the:
- Right front door CL motor (M14/5)
- Left front door CL motor (M14/6)
- Left rear door CL motor (M14/8)
- Right rear door CL motor (M14/9)
- Fuel filler flap CL motor (M14/10)

In addition the rear SAM control unit enables or disables the opening request from the rear-end door handle switch (S88/9) or spare tire carrier control button (S151/3) (with code (849) Spare tire holder/spare tire).

If the vehicle is unlocked and the rear-end door handle switch or spare tire carrier control button is actuated, the rear SAM control unit is actuated by the rear-end door locking unit (A72) or spare tire carrier CL motor (M14/13) (with code (849) Spare tire carrier/spare wheel) to unlock mechanically.

Function sequence for visual feedback (without code (494) USA version)
After successfully locking or unlocking, the following components provide visual feedback:
- Left turn signal light (E1e5)
- Right turn signal light (E2e5)
- Left turn signal lights (E3e1) (without code (849) Spare tire holder/spare tire)
- Right turn signal lights (E4e1) Left turn signal lights (E3/5e1)
- Left turn signal lights (E3/5e1) (with code (849) Spare tire holder/spare tire)
- Right turn signal lights (E4/5e1) with code (849) Spare tire holder/spare tire)
- Left outside mirror turn signal lamp (E6/5)
- Right outside mirror turn signal lamp (E6/6)

The function is controlled by the front SAM control unit, transmitting the turn signal as blinkmaster to the interior CAN:
- Locking: flashing 3 times
- Unlocking: flashing once

Vehicles with code (551) Anti-theft alarm system (ATA): If the driver door in the locked vehicle is opened mechanically with the emergency key, the anti-theft alarm system (ATA) triggers an alarm.