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

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

Function requirements, general
^ Terminal 15C OFF

Central locking (CL), operation with transmitter key, general
The central locking is operated via the transmitter key (A8/1) and enables the vehicle to be locked or unlocked centrally.

As an alternative to the transmitter key the locking or unlocking of the doors is possible via the emergency key integrated in the transmitter key.

The CL [ZV] function comprises the following partial functions:
^ Function sequence for presetting global or selective unlocking
^ Function sequence for locking or unlocking
^ Function sequence for acoustic locking feedback (as of 1.6.10)
^ Function sequence for optical locking feedback
^ Function sequence for trunk lid remote opening (model 204.0) or liftgate remote opening (model 204.2/9 with code (890) EASY-PACK liftgate)

Function sequence for presetting global or selective unlocking
If the "Unlock" button and "Lock" button on the transmitter key are pressed simultaneously for t = 5 s, it switches back and forth between the global unlocking and selective unlocking settings. 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 fuel filler flap are unlocked when the "Unlock" button on the transmitter key is pressed. The entire vehicle is unlocked only when the button is pressed again.

Function sequence for locking or unlocking
When the "Lock" or "Unlock" buttons on the transmitter key are actuated, it transmits a radio signal with the FM, AM and CL antenna amplifier (A2/18) (model 204.0) or rear window antenna amplifier 1 (A2/71) (model 204.2/9) to the rear SAM control unit with fuse and relay module (N10/2). This relays the signal to the electronic ignition lock control unit (N73) via the interior CAN (CAN-B).
Parallel to the radio signal, an infrared signal is transmitted to the driver front door infrared remote control receiver (A26/1) (precise aiming required).
This signal is read in by the left front door control unit (N69/1) and transmitted to the electronic ignition switch control unit with interior CAN.

The infrared and radio signals contain the same information (redundant). The first signal received always has priority.

The access authorization for the transmitter key is checked in both cases by the electronic ignition switch control unit.
If the access authorization is valid, the electronic ignition switch control unit transmits the command "Lock or unlock" via the interior CAN to the following control units:
- Left front door control unit
- Right front door control unit (/)N69/2
- Front SAM control unit with fuse and relay module (N10/1) (up to 30.11.09)
- Left rear door control unit (N69/3) (as of 1.12.09)
- Right rear door control unit (N69/4) (as of 1.12.09)
- Rear SAM control unit

The left front door control unit locks or unlocks the left front door lock (A85) via the left front door central locking motor (A85m1). The right front door control unit locks or unlocks the right front door lock (A85/1) via the right front door central locking motor (A85/1m1)

Vehicles up to 30.11.09:
The front SAM control unit locks or unlocks the left rear door lock (A85/3) over the left rear door central locking motor (A85/3m1) and the right rear door lock (A85/4) over the right rear door central locking motor (A85/4m1).

Vehicles as of 1.12.09:
The left rear door control unit locks or unlocks the left rear door lock over the left rear door central locking motor. The right rear door control unit locks or unlocks the right rear door lock over the right rear door central locking motor.

The rear SAM control unit locks or unlocks the tank cap over the tank cap central locking motor (M14/10).
In addition the rear SAM control unit blocks the opening request of the trunk lid external operation switch (S88/8) (model 204.0) or the liftgate external operation switch (S88/8) (model 204.2/9) or it enables the request accordingly.

The status of the vehicle doors as well as the trunk lid or lift gate is read in over the following switches:
- Left front door rotary tumbler switch (A85s1)
- Right front door rotary tumbler switch (A85/1s1)
- Left rear door rotary tumbler switch (A85/3s1)
- Right rear door rotary tumbler switch (A85/4s1)
- Trunk lid rotary tumbler switch (M14/7s1) (model 204.0)
- Liftgate rotary tumbler switch (M14/7s1) (model 204.2/9)

The corresponding door, trunk lid or liftgate is locked or unlocked, depending on the status (open or closed).

On model 204.0/2 for Great Britain, the following components are actuated in addition:
- Left front door additional door lock actuator motor (A85m4) by left front door control unit
- Right front door additional door lock actuator motor (A85/1m4) by right front door control unit
- Left rear door additional door lock actuator motor (A85/3m4) by left rear door control unit
- Right rear door additional door lock actuator motor (A85/4m4) by right rear door control unit

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.

Function sequence for acoustic locking feedback (as of 1.6.10)
The acoustic locking feedback can be selected and activated in the IC (A1) via the left multifunction steering wheel button group (S110). The control signals from the left multifunction steering wheel button group are read in by the steering wheel electronic (N135) via the steering LIN (LIN E1) from the steering column tube module control unit (N80) which passes on the control signals via the chassis CAN (CAN E) to the IC.
The instrument cluster transmits the status of the acoustic locking feedback via the body CAN to the front SAM control unit. If the function of acoustic locking feedback has been activated, after successful locking or unlocking an acoustic feedback takes place after brief actuation of the left horn (H2) and right horn (H2/1).

If the transmitter key is valid and the acoustic feedback is activated, the electronic ignition lock control unit transmits the command "Lock or unlock" via the body CAN to the front SAM control unit. As a result of this the front SAM control unit actuates the horns briefly via the horns relay (N10/1kO).

Number of acoustic signals:
- Locking: three times
- Unlocking: once

If when locking a door or on model 204.2/9 the liftgate is still opened, the acoustic locking feedback is discontinued.

On vehicles up to 31.5.10 with code (494) USA version, the acoustic locking feedback via the horns replaces the acoustic locking feedback via the alarm siren (H3/1).

Function sequence for optical locking feedback
After successful locking or unlocking in each case an optical locking feedback takes place via the following components:
- Left turn signal indicator lamp (A1e1)
- Right turn signal indicator lamp (A1e2)
- Left front turn signal lamp (E1e5)
- Right front turn signal lights (E2e5)
- Left rear turn signal lights (E3e1)
- Right rear turn signal lights (E4e1)
- 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, which as "Blinkmaster" transmits the signal for flashing via the body CAN.

Number of optical signals:
- Locking: flashes 3 times
- Unlocking: flashes once

If when locking a door or on model 204.2/9 the liftgate is still opened, visual locking feedback is discontinued.

Detailed information on turn signal light actuation is described in the document "Turn signal light actuation function".

Function sequence for trunk lid remote opening (model 204.0) or liftgate remote opening (model 204.2/9 with code (890) EASY-PACK liftgate)
When the "Trunk lid remote opening" button is pressed on the remote control key, a radio signal is sent over the FM, AM and CL antenna amplifier (model 204.0) or rear window antenna amplifier 1 (model 204.2/9) to the rear SAM control unit. This relays the signal to the electronic ignition switch control unit via the interior CAN.
This signal is read in by the left front door control unit and transmitted to the electronic ignition switch control unit with interior CAN.
The access authorization for the transmitter key is checked in both cases by the electronic ignition switch control unit.

If the access authorization is valid, the electronic ignition switch control unit transmits the command "Lock or unlock" to the rear SAM control unit via the interior CAN.
On model 204.0, the trunk lid rotary tumbler is unlocked by the trunk lid central locking motor (M14/7). The trunk lid is then opened mechanically by spring force as far as the upper stop.

On model 204.2/9, the liftgate rotary tumbler is unlocked by the liftgate central locking motor (M14/7). The liftgate is then opened automatically.

Detailed information on the liftgate control is given in the function description for the "Rear-end door remote control"