Keyless Go control unit, component description - GF80.61-P-4200GZ

MODEL 164 with CODE (889) Keyless Go up to Model Year 2008

Shown on model 164.1 Left rear door

Fig 1: Identifying Keyless Go Control Unit - Shown On Model 164.1

Courtesy of MERCEDES-BENZ USA

Location

The Keyless Go control unit is located in the right rear in the trunk below the window.

Task

The Keyless Go control unit has the purpose to read in, evaluate and actuate data.

The Keyless Go control unit has the following purposes:

Scan

Left front door Keyless Go door handle (A17/1)
Right front door Keyless Go door handle (A17/2)
Left rear door Keyless Go door handle (A17/3)
Right rear door Keyless Go door handle (A17/4)

A button for pressing is located on the corresponding outer side of the door handle; the vehicle is locked or convenience closed with this button. A capacitive sensor is located on the inside of each door handle with which the control unit initiates a contact for key search. The Hall sensor recognizes when a door handle is pulled; this opens the vehicle door and the servo opening is actuated. Each door handle is read in by the Keyless Go control unit with two lines and processed.

Read in switches on rear-end door

Rear-end door Keyless Go button (S62/21)

Actuate

Right front door CL motor (M14/5)
Left front door CL motor (M14/6)
Left rear door CL [ZV] motor (M14/8)
Right rear door CL [ZV] motor (M14/9)

Only the servomotors really present in the CL motors are actuated They act on the rotary tumbler of the lock to unlock the door. A limit switch sensing the position of the servo motor, is also read in and processed.

Actuation and evaluation

Keyless Go trunk antenna (A2/35)
Left rear door Keyless Go antenna (A2/39)
Right rear door Keyless Go antenna (A2/41)
Keyless Go cockpit antenna (A2/60)
Interior Keyless Go antenna (A2/61)

The CL antenna in the roof antenna module is also read in (A2/93). The CL antenna is actuated directly via a splitter for the Keyless Go request. The Keyless Go antenna operates at a frequency of 125 kHz.

The Keyless Go key transmits at the following frequencies: ECE with 433.92 MHz and USA with 315 MHz.

Signal inputs and signal outputs

Discrete inputs

Circuit 30
Circuit 31
Door handles
Microswitch for servo motors (in door locks)
Close button for rear-end door
Roof antenna module
Keyless Go antennas

Discrete outputs

Servo motors for actuating rotary tumblers (in door locks)
Door handles
Roof antenna module
Keyless Go antennas