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

MODEL 209.3 /4 with CODE (889) Keyless-Go

Fig 1: Engine Start/Stop Function - Model 209.3 /4 With Code (889) Keyless-Go

Courtesy of MERCEDES-BENZ USA

Shown up to 31.5.04

Function

The engine can be started or switched off by actuating the KEYLESS-GO start/stop button (S2/3) on the selector lever.

Start engine

Function requirements

The transmitter key (A8/1) is located in the interior compartment
Service brake operated
Doors closed
Selector lever in position "P" or "N"

Function sequence

Press KEYLESS-GO start/stop button (S2/3) on selector lever
A wake-up signal is transmitted to the transmitter key via the KEYLESS go antennas (A2/31, A2/35, A2/38, A2/40) and the interior module KEYLESS-GO control unit (N103) A8/1
Location finding signals are transmitted via the KEYLESS-GO antennas (A2/31, A2/35, A2/38, A2/40) and the interior module KEYLESS-GO control unit (N103).
On vehicles as of 1.6.04, the antenna integrated into the interior module KEYLESS-GO control unit (N103) is replaced by the separate interior KEYLESS-GO antenna.
The position data, the validity and the access authorization are transmitted via the KEYLESS-GO HF antenna cable end (Z87/15) to the rear module KEYLESS-GO control unit (N102).

6. Transmission of access authorization to the EIS control unit (N73) and to the electric steering lock control unit (N26/5).
7. If the checks were positive, circuit 15R and circuit 15 are switched on, if not already switched on, the steering lock unlocked and the engine started.
Error messages occurring are displayed in the instrument cluster (A1).

Switch off engine

Function requirement

Selector lever in position "P" or "N"

Function sequence

Actuate Keyless-Go start/stop button (S2/3) on selector lever.

Engine is switched off and circuit 15 R remains on.

Error messages occurring are displayed in the instrument cluster (A1).

Additional circuit switching operations are given in the table below.

Warning messages

If, after starting the engine, the transmitter key (A8/1) can no longer be located in the interior compartment (system error or transmitter key (A8/1) not present), the instrument cluster (A1) outputs a warning message for approx. 5 s.

This is repeated every 5 km. After traveling > 20 km, a continuous warning message is output and an intermittent gong sounds.

Vehicles up to 31.5.07:

Next time the vehicle stops (v = 0 km/h) the engine is automatically switched on.

Vehicles as of 1.6.07

These warning messages are maintained until the driver switches off the engine (no automatic engine switch-off).

In this case, it is not possible to start the engine on either version.

Actuation of KEYLESS-GO start/stop button (S2/3) (Initial state: circuit 15R, circuit 15 and engine are Off)	Status after actuating KEYLESS-GO start/stop button (S2/3)	Status after actuating KEYLESS-GO start/stop button (S2/3) Preconditions: Driver open opened after actuation Service brake not applied during actuation	Status after actuating KEYLESS-GO start/stop button (S2/3) Preconditions: Driver door remains closed after actuation Service brake not actuated during actuation
1st actuation	Circuit 15 On, engine is started Preconditions: Foot brake actuated Selector lever in position P or N	Circuit 15R On	Circuit 15R On
2nd actuation	Circuit 15R On, engine is switched off Preconditions: Doors closed Selector lever in position P or N	Circuit 15 On	Circuit 15 On
3rd actuation	Circuit 15 On, engine is started	Circuit 15 Off	Circuit 15 Off
		Circuit 15R Off	Circuit 15R Off
		Circuit 15C Off	Circuit 15C On
	Preconditions: Service brake operated Selector lever in position P or N

Transmitter key, task/design/function		GF80.57-P-4101T
Keyless-Go control unit, location/task	Left door Keyless-Go control unit	GF80.61-P-4105Q
	Right door Keyless-Go control unit	GF80.61-P-4105QA
	Rear module Keyless-Go control unit	GF80.61-P-4105QB
Electronic ignition switch control unit, location/task		GF80.57-P-4120Q