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Home >> Mercedes Benz >> 2005 >> ML500 >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Anti-Theft & Central Locking System -- 163 Chassis >> Basic Knowledge >> Radio frequency/electric central locking (RFL), function - GF80.35-P-0002GH

Radio frequency/electric central locking (RFL), function - GF80.35-P-0002GH

MODEL 163 

The radio frequency/electric central locking (RFL) system consists of two components:

Access and drive authorization system 

A special lock number and eight key numbers exist for each vehicle. During installation the keys and engine control module are "married" with the all-activity module (AAM). This means that the AAM "learns" the key numbers of the valid keys and the special lock number. The engine control module then "learns" from the AAM the special vehicle lock number. Moreover the AAM writes an alternating code into each valid key. This alternating code is changed by the AAM each time the key is inserted into the ignition lock. Before the vehicle can be started the drive authorization  is checked.

Radio frequency remote control 

The central locking system  is controlled  by a radio frequency signal from the remote control key  . The remote control key transmits a code containing its key number identifying it as a valid key.

REFER TO BASIC KNOWLEDGE Operation of central locking with remote control key   GF80.20-P-3006GH 
REFER TO BASIC KNOWLEDGE Checking drive authorization   GF80.57-P-3001GH 
REFER TO BASIC KNOWLEDGE Remote control key   GF80.30-P-4001GH 
REFER TO BASIC KNOWLEDGE All-activity module (AAM)   GF54.21-P-4100GH