GF54.65-P-0005CA Reversing Camera (RFK), Function

GF54.65-P-0005CA Reversing Camera (RFK), Function
MODEL 207.3 /4
- with CODE (218) Backup camera
- except CODE (498) Japan version

Function requirements, general
^ Circuit 15 ON
^ Reversing camera function activated through COMAND control unit (A40/3)
The electronic ignition lock control unit transmits circuit status of circuit 15 (N73) via the interior CAN (CAN B) to the rear SAM control unit with fuse and relay module (N10/2).

Reversing camera, general
The reversing camera function assists the driver when reversing and reversing into a parking space.

Reversing camera function sequence
The reversing camera (B84/3) is powered by the reversing camera power supply module (N66/10) when reverse gear is engaged (with transmission 711, 716) or gear range "R" is engaged (with transmission 722).
The "reverse gear engaged" status is defined as follows:
Vehicles with transmission 711, 716:
Reverse gear engagement is detected via the status of the backup lamp switch (S16/2), which is read in directly by the front SAM control unit with fuse and relay module (N10/1).
Vehicles with transmission 722:
The request to engage gear range "R" is defined by the corresponding selector lever position.
The electronic selector lever module control unit (N15/5) transmits the selector lever position via drive train CAN (CAN C), CDI control unit (N3/9) (with diesel engine) or ME-SFI [ME] control unit (N3/10) (with gasoline engine) and chassis CAN (CAN E) to the front SAM control unit.
Two microprocessors are installed in the front SAM control unit, one for control of basic functions, e.g. the exterior lights, and the second for control of the central gateway functions. Both processors communicate with one another internally over the interior CAN
Using all incoming information, the microprocessor which controls the central gateway functions generates the "reverse gear engaged" signal (irrespective of the transmission variant) and sends this signal to the rear SAM control unit via the interior CAN.
The rear SAM control unit then activates the backup lamp and also supplies the reversing camera power supply module with voltage.
The pictures taken by the reversing camera are sent as a Composite Video Baseband Signal (CVBS) over the reversing camera power supply module to the COMAND controller unit.
The COMAND controller unit then activates the Audio/COMAND display (A40/8) over the telematics CAN (CAN A). The pictures recorded by the reversing camera are then sent directly over the low voltage differential signal (LVDS) line to the Audio/COMAND display and issued there.