Operating central locking with transmitter key, function

General function requirements

 C. 15C OFF

Central locking (CL), operation with transmitter key (A8/1) general

The CL can be operated with the transmitter key.

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

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Function sequence for presetting global and selective unlocking

If the unlock and lock buttons on the transmitter key are pressed simultaneously for t = 5 seconds, a change between the "global" and "selective" settings takes place. The indicator lamp on the transmitter key comes on 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 the first time. The next actuation unlocks the entire vehicle.

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Function sequence for locking or unlocking

When the unlock or lock button the transmitter key is actuated, it transmits a radio signal via the window antenna amplifier module 2 (A2/72) to the rear SAM control unit with fuse and relay module (N10/2). 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 interior CAN..

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

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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:

- 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)

- Fuel filler flap CL motor (M14/10)

Moreover, the rear SAM control unit enables or disables the opening request from the trunk lid external switch (S88/8).

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Function sequence for visual feedback

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)

- Right turn signal light (E4e1)

- Left outside mirror turn signal lamp (E6/5)

- Right outside mirror turn signal lamp (E6/6)

The function is controlled by the rear SAM control unit, transmitting the turn signal as flasher to the interior CAN:

- Locking: flashes three times

- Unlocking: flashes 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.

On vehicles for the Netherlands, an acoustic feedback is output additionally via the alarm siren (H3/1) when locking or unlocking.