Locking/unlocking vehicle with inside switch, function - GF80.20-P-3009SX

MODEL 221.0 /1, 216.3 up to Model Year 8

Fig 1: Locking/Unlocking Vehicle With Inside Switch Function Diagram

Courtesy of MERCEDES-BENZ USA

The following functions can be actuated using the switch in the passenger compartment:

Locking or unlocking central locking (CL)
Open trunk lid
Trunk lid emergency opening (only )

Locking or unlocking CL

Function requirements:

Vehicle unlocked globally or selectively

Function

The vehicle (except fuel filler flap) can be locked or unlocked by actuating the CL switch. The signal from the CL switch is transmitted via front door LIN to the corresponding door control unit which relays the signals to the EIS control unit. The EIS control unit transmits the command "Lock or unlock" to the corresponding door control units or rear SAM control unit. The door control units then actuate the door lock units correspondingly.

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

Enabled function depending on door status

Driver and passenger door closed:

Unlocking function activated
Locking function activated

Passenger door open:

Unlocking function activated
Locking function deactivated

Driver door open:

Unlocking function activated
Locking function activated (Drive's door not actuated)

The current door status of the front doors is relayed by the corresponding door lock unit to the corresponding door control unit which relays the signals to the EIS control unit.

Opening trunk lid

Function requirements:

Vehicle unlocked globally (not with emergency opening )

Trunk lid open/close switch

The trunk lid open/close switch is located in the driver power window, outside mirror and trunk lid switch group (S20/1) and is read in by the door control unit via front door LIN. When the trunk lid open/close switch is actuated, the signal from the door control unit is relayed via the EIS control unit to the rear SAM control unit, which actuates the trunk lid CL motor to unlock.

Trunk lid emergency opening switch (only )

The trunk lid emergency release switch is located on the inside of the trunk lid and is read in by the rear SAM control unit. When the trunk lid emergency release switch is actuated, the rear SAM control unit actuates the trunk lid CL motor to unlock. This function is independent of the vehicle speed and locking status.

Rear SAM control unit with fuse and relay module, component description	N10/2	GF54.21-P-6030SX
Driver-side front door control unit, component description	N69/1 Model 221	GF72.29-P-6000SX
Driver-side front door control unit, component description	Model 216	GF72.29-P-6000SC
Passenger-side front door control unit, component description	N69/2 Model 221	GF72.29-P-6010SX
	Model 216	GF72.29-P-6010SC
Rear door control unit component description	N69/3, N69/4 Model 221	GF72.29-P-6020SX
Electronic ignition/starter switch control unit (EIS) component description	N73	GF80.57-P-6000SX