Overhead Control Panel Control Unit, Component Description - GF82.20-P-5216FR

Model 257, 290 

up to model year 2021 

Courtesy of MERCEDES-BENZ USA

Shown on model 257 with code 414 (Sliding roof) and code 362 (HERMES LTE) 

Location 

The overhead control panel control unit is located in the front section of the headliner.

Tasks 

The overhead control panel control unit has the following tasks:

• Reading in of signals 
• Evaluation of input factors 
• Actuation of components 
• Transmission and reception of ultrasound waves (with code 852 (Sensor system for anti-theft alarm system (ATA)) or code 882 (Interior protection and tow-away protection)) 
• Recognition of changes of vehicle inclination (with code 852 (Sensor system for anti-theft alarm system (ATA)) or code 882 (Interior protection and tow-away protection)) 

Reading in of signals 

The input factors are read in via the following connections:

Roof LIN 

• Direct line 
• Roof LIN (LIN B13) 
• Alarm system LIN (LIN B14) (with code 882 (Interior protection and tow-away protection)) 
• Interior CAN (CAN B) 

Direct line 

The signals from the following components are read via direct lines:

• Interior temperature sensor with integrated fan (N70b1)
• Roof system switch (with code 414 (Sliding sunroof))
• Interior lamp automatic function button
• Front dome lamp button
• Left front reading lamp button
• Right front reading lamp button
• SOS button (with code 362 (HERMES LTE))
• Mercedes me connect button (with code 362 (HERMES LTE))
• Left rear dome lamp (E11/1)
  • Left rear passenger compartment reading lamp button (E11/1s2) (with code 891 (Premium ambient lighting))
• Right rear dome lamp (E11/2)
  • Right rear passenger compartment reading lamp button (E11/2s2) (with code 891 (Premium ambient lighting))
• Left rear glass breakage sensor (B39), right rear glass breakage sensor (B39/1) and rear window glass breakage sensor (B39/4) (model 290 with code 882 (Interior protection and tow-away protection))

The signals are read in by the overhead control panel control unit via the roof LIN.

Alarm system LIN (with code 882 (Interior protection and tow-away protection)) 

The overhead control panel control unit reads in the signals from the alarm siren (H3/1) via the alarm system LIN.

Interior CAN 

The signals are read in by the overhead control panel control unit via the interior CAN.

Evaluation of input factors 

The input factors are evaluated by the microprocessor and the relevant components are actuated.

Actuation of components 

The actuation of the components takes place via the following connections:

• Direct line 
• Roof LIN 
• Alarm system LIN (with code 882 (Interior protection and tow-away protection)) 
• Roof ambient lighting-LIN (LIN B36) (with code 811 (Advanced sound system) and code 891 (Premium ambient lighting)) 
• Interior CAN 

Direct line 

The following components are actuated via direct lines:

• Front dome lamp
• Eyeglasses box illumination (N70e8)
• Fan motor in interior temperature sensor with integrated fan
• Left sun visor mirror lamp (E14/1) via the left front mirror lamp switch (S101)
• Right sun visor mirror lamp (E14/2) via the right front mirror lamp switch (S102)
• Left rear dome lamp
  • Left rear passenger compartment reading lamp (E11/1e1) (with code 891 (Premium ambient lighting))
  • Left rear interior lamp (E11/1e2)
• Right rear dome lamp
  • Right rear passenger compartment reading lamp (E11/2e1) (with code 891 (Premium ambient lighting))
  • Right rear interior lamp (E11/2e2)

Roof LIN 

The overhead control panel control unit actuates the following components over the roof-LIN:

• Left reading lamp (A67e1)
• Right reading lamp (A67e2)
• Ambient lamp (A67e3)

Alarm system LIN (with code 882 (Interior protection and tow-away protection)) 

The overhead control panel control unit actuates the alarm siren via the alarm system LIN.

Roof ambient lighting-LIN (with code 811 (Advanced sound system) and code 891 (Premium ambient lighting)) 

The overhead control panel control unit actuates the following components:

• Roof center mid-range speaker ambient lighting (E43/55)
• Left center roof lining mid-range speaker ambient lighting (E43/71)
• Right center roof lining mid-range speaker ambient lighting (E43/72)

Interior CAN 

The signals are sent by the overhead control panel control unit via the interior CAN.

Transmission and reception of ultrasound waves (with code 852 (Sensor system for anti-theft alarm system (ATA)) or code 882 (Interior protection and tow-away protection)) 

The overhead control panel control unit monitors the vehicle interior for movements by sending and receiving ultrasonic waves. The overhead control panel control unit contains the following components for this purpose:

• Interior protection receiver (N70a1)
• Left interior protection transmitter (N70a2)
• Right interior protection transmitter (N70a3)

Recognition of changes of vehicle inclination (with code 852 (Sensor system for anti-theft alarm system (ATA)) or code 882 (Interior protection and tow-away protection)) 

If the inclination sensor integrated in the overhead control panel control unit senses an alarm-relevant inclination change, an alarm is output.

Wiring diagram for overhead control panel (OCP) control unit

PE54.21-P-2107-97XBA