Engine start/stop, function - GF80.61-P-3012SM

MODEL 220, 215 as of 1.10.02

Fig 1: Engine Start/Stop, Function Diagram

Engine start-stop, function

The engine can be started or shut off by pressing the start/stop keyless go button (S2/3) on the selector lever.

Start engine

Function requirement for "Start engine"

The transmitter key (A8/1) is located in the passenger compartment.
The selector lever is in position "P "or "N"
The foot brake is operated.

Function sequence

Press keyless go start/stop button (S2/3) on selector lever.
A wake-up signal is transmitted to the transmitter key (A8/1).
The transmitter key (A8/1) transmits its authorization This authorization is received by the HF antenna and is relayed to the keyless go control module (N69/5) via the overhead control panel control module (N70)
The keyless go control module (N69/5) checks whether the transmitter key (A8/1) is authorized for the vehicle
Transmit access authorization code to EIS control module (N73).
If the checks were positive, circuit 15R and circuit 15 - if not already switched on - are switched on, the steering lock is unlocked and the engine is started.

If applicable, errors occurring are output by the instrument cluster (A1).

Switch off engine

Function requirements for "Switching off engine"

The selector lever is in position "P "or "N"

The position of the transmitter key (A8/1) is not checked.

Function sequence

Press start/stop keyless go button (S2/3) on gear selector lever.

Circuit 15 is switched off When the driver's door is closed circuit 15c remains active and the steering lock unlocked. Additional actuation possibilities are given in the following table.

Actuation of start/stop keyless go button (S2/3) (Initial state: c. 15R, c. 15 and engine are OFF)	Status after actuation of keyless go start/stop button (S2/3)	Status after actuation of keyless go start/stop button (S2/3)	Status after actuation of keyless go start/stop button (S2/3)
		Requirements: Driver's door is opened after button is actuated (D), Foot brake is not operated when operating push-button	Requirements: Driver's door remains closed after button is actuated (D), Foot brake is not operated when operating push-button
1st operation	Circuit 15 ON, engine is started	C. 15R ON	C. 15R ON
	Requirements: Foot brake actuated (A), selector lever to position P (B)
2nd operation	Circuit 15R ON, engine is switched off	Circuit 15 ON	Circuit 15 ON
	Requirements: Selector lever in position P or N (B)
3rd operation	Circuit 15 ON, engine is started	Circuit 15 OFF Circuit 15R OFF Circuit 15C OFF	Circuit 15 OFF Circuit 15R OFF C. 15C ON
	Requirements: Foot brake actuated (A), Selector lever to position P (B)

If a door contact switch is actuated when the engine is running and the vehicle is standing still, the EIS control module (N73) checks the key when restarting. If a valid transmitter key (A8/1) is not recognized in the passenger compartment of the vehicle, the instrument cluster (A1) indicates "key not recognized". The engine remains on, but the car should be taken to a workshop without delay. If the transmitter key (A8/1) is available, the vehicle should be restarted with the transmitter key (A8/1)

If a transmitter key (A8/1) is not recognized when starting, the instrument cluster (A1) indicates "key not recognized "and the start attempt is interrupted (circuit 15R and 15 remain off).

If the selector lever is not in position "P "or "N "when an attempt is made to start, the following appears in the instrument cluster (A1): "Selector lever to P or N".

If the transmitter key (A8/1) is recognized, analog circuit switching is accomplished. If the selector lever is not in position "P "or "N "when an attempt is made to switch the engine off, the text "Selector lever to P or N "appears in the instrument cluster (A1).

If the selector lever is not in position "P "when the engine is switched off, an audible warning signal sounds and the following text appears in the instrument cluster (A1): "Selector lever to P or N".

If the circuits described are activated through the keyless go start/stop button (S2/3) and a valid transmitter key is then inserted into the EIS control module 1(N73), the transmitter key (A8/1) is given priority if the selector lever in position "P". If running, the engine is switched off.

	Transmitter key, task/design/function		GF80.57-P-4101S
	Electronic ignition switch control module, location/task/design/function		GF80.57-P-4102S
	Keyless go control module, location/task/design/function		GF80.61-P-4102SM
	Keyless go antenna, location/task/design/function		GF82.62-P-4100SM