Component Description For Overhead Control Panel Control Unit - GF82.20-P-5216FH
Model 238
Up To Model Year 2021
Shown on overhead control panel control unit in model 238.3 as of 01.06.2018 With Code 413 (Panoramic sliding sunroof) and code 351 (Emergency call system (HERMES))
Shown on overhead control panel control unit in model 238.3 up to 31.05.2018 With Code 413 (Panoramic sliding sunroof) and code 351 (Emergency call system (HERMES))
Shown on overhead control panel control unit in model 238.4 With Code 877 (Ambient lighting) or code 891 (Premium ambient lighting)
Shown on emergency call system button group (S93/3) for model 238.4 as of 01.06.2018 With Code 351 (Emergency call system (HERMES))
Shown on emergency call system button group in model 238.4 up to 31.05.2018 With Code 351 (Emergency call system (HERMES))
Location
The overhead control panel control unit is located in the front section of the headliner.
The emergency call system button group (model 238.4 with code 351 (Emergency call system (HERMES))) is located between the overhead control panel control unit and the inside rearview mirror (A67) at the front at the roof lining.
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))
- Detection of changes to 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:
- 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 (model 238.3 with code 413 (Panoramic 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 351 (Emergency call system (HERMES))
- Breakdown assistance button (up to 31.05.2018 with code 351 (Emergency call system (HERMES)))
- MB Info button (up to 31.05.2018 with code 351 (Emergency call system (HERMES)))
- Mercedes me connect button (as of 01.06.2018 with code 351 (Emergency call system (HERMES)))
- Rear passenger compartment dome lamp button (for model 238.3 standard equipment, for model 238.4 with code 877 (Ambient lighting) or code 891 (Premium ambient lighting))
Roof LIN
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 following component parts via the alarm system LIN:
- Alarm siren (H3/1)
- Left front door interior protection sensor (B44/1) (model 238.4)
- Right front door interior protection sensor (B44/2) (model 238.4)
- Left rear interior protection sensor (B44/3) (model 238.4)
- Right rear interior protection sensor (B44/4) (model 238.4)
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))
- Interior CAN
Direct line
The following components are actuated via direct lines:
- Front dome lamp (model 238.3)
- Left interior/reading lamp (model 238.4)
- Right interior/reading lamp (model 238.4)
- Left overhead control panel light-emitting diode (model 238.4)
- Right overhead control panel light-emitting diode (model 238.4)
- Glasses compartment illumination (N70e8) (model 238.4)
- 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)
- Rear passenger compartment dome lamp (E15/3) (for model 238.3 standard equipment, for model 238.4 with code 877 (Ambient lighting) or code 891 (Premium ambient lighting))
- Rear interior lamp (E15/3e3)
- Rear dome lamp ambiance illumination (E15/3e5)
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.
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 includes the following components for this purpose:
- Interior protection receiver (N70a1)
- Left interior protection transmitter (N70a2)
- Right interior protection transmitter (N70a3)
Detection of changes to 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-2107-97DCA |