GF80.61-P-3012LE Engine Start/Stop, Function

GF80.61-P-3012LE Engine Start/Stop, Function
- with CODE (889) Keyless Go


General function requirements
^ The transmitter key (A8/1) is located in the vehicle interior

Engine start/stop, general
The engine start/stop function allows to start and stop the engine.

The engine start/stop function comprises the following subfunctions.
^ Function sequence for starting engine
^ Function sequence for circuit activation
^ Function sequence for stopping engine

Additional function requirements for starting engine
^ DIRECT SELECT gear selector switch (S16/13) is in the "P" or "N" position.
^ Brake pedal actuated (signal from ESP control unit (N47-5))

Function sequence for starting engine
When the KEYLESS-GO start/stop button (S2/3) is pressed, the signal "Start engine" is transmitted to the EIS control unit (N73). It transmits the signal to the KEYLESS-GO control unit (N69/5) via interior CAN.
The KEYLESS-GO control unit then transmits wake-up and location finding signals via the following components to the transmitter key:
- Center console Keyless-Go antenna (A2/60)
- interior Keyless-Go antenna (A2/61)

The transmitter key transmits its access authorization code and its position to the rear window antenna amplifier module (A2/12), which relays it to the KEYLESS-GO control unit. The access authorization code is transmitted to the EIS control unit via the interior CAN.

If the access authorization code is valid and the transmitter key is located in the vehicle interior, c. 15R and c. 15 are switched on and the motor for the ME-SFI control unit (N3/10) (on gasoline engine) or CDI control unit (N3/9) (on diesel engine) is started.

Error messages in instrument cluster (A1):
- If a transmitter key is not recognized in the interior compartment when starting, the instrument cluster indicates "Key not recognized" and the start attempt is interrupted (circuit 15R and circuit 15 remain off).
- If the DIRECT SELECT gear selector switch is not in position "P" or "N" when the engine is started, a chime sounds and a corresponding text appears in the instrument cluster.

The display request in the instrument cluster is transmitted by the KEYLESS-GO control unit to the central gateway control unit (N93) via the interior CAN. The central gateway control unit transmits the request to the instrument cluster via the central CAN.
Each time the vehicle is started or if a door is opened with the engine running, the EIS control unit requests the Keyless-Go control unit to check the transmitter key.
If a transmitter key is not recognized in the interior compartment, the instrument cluster indicates: "Key not recognized".

Function sequence for circuit activation
If the foot brake is not depressed when the KEYLESS-GO start/ stop button is actuated, only circuit 15R is switched on. Repeated actuation activates circuit 15. Further repeated actuation switches circuit 15R and circuit 15 off. If the driver door is closed, circuit 15C remains active for t = 30 min.

Function sequence for stopping engine
When the KEYLESS-GO start/stop button is pressed, the signal "Stop engine" is transmitted to the EIS control unit and then c. 15 is switched off and the motor is switched off by the ME-SFI control unit or CDI control unit. If the driver door is closed, circuit 15C remains active for t = 30 min.

Switching off engine depending on vehicle speed:
- Speed v < 3 km/h: Switch off immediately
- Speed v > 3 km/h: Switch-off occurs only after pressing KEYLESS-GO start/stop button for longer than t > 3 s