Reversing camera (RFK), function - GF54.65-P-0005GD

MODEL 204.0/2 up to 28.2.11 

with CODE (218) Reversing camera 

except CODE (498) Japan version 

as of model year 2010 

/YoM 09 

MODEL 204.0/2 

with CODE (218) Reversing camera 

as of model year 2012 

/YoM 11 model refinement package 

MODEL 204.9 

with CODE (218) Reversing camera 

except CODE (498) Japan version 

MODEL 204.3 with CODE (218) Reversing camera 

Function requirements, general 

• Circuit 15 ON
• Reversing camera function activated through the COMAND controller unit
• Reverse gear (transmission 711, 716) or gear range "R" (transmission 722) engaged

The electronic ignition lock control unit sends the status of circuit 15 via the interior CAN to the rear SAM control unit.

Reversing camera, general 

The reversing camera function supports the driver when reversing into a parking space by optically recording the road space to the rear of the vehicle and showing it to the driver on the Audio/COMAND display.

Parking on model 204.0/2 as of 1.3.11, model 204.9 as of 1.12.10 and model 204.3 is also made easier by the display of guide lines.

The guide lines means the following:

• Blue guide line:

  Extended vehicle side line

• Yellow guide line:

  Distance to vehicle s = 1 m

• Red guide line:

Distance to vehicle s = 0.25 m

Function sequence for reversing camera 

model 204.0/2 up to 28.2.11, model 204.9 up to 30.11.10:

When reverse gear or gear range "R" is engaged the reversing camera is powered by the reversing camera power supply module. The reversing camera power supply module is actuated by the rear SAM control unit.

The "reverse gear engaged" status is defined as follows.

Vehicles with transmission 711, 716:

Engagement of reverse gear is defined via the status of the backup lamp switch, which is read in directly by the front SAM control unit.

Vehicles with transmission 722.6:

The request to engage gear range "R" is defined by the corresponding selector lever position.

The electronic selector lever module control unit sends the selector lever position via drive train CAN, CDI control unit, or ME-SFI [ME] control unit and chassis CAN to the front SAM control unit.

Located in the front SAM control unit are two microprocessors, 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 via 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 over the interior CAN.

The rear SAM control unit then actuates the reversing camera power supply module, which supplies power to the reversing camera.

The pictures recorded by the reversing camera are sent as a CVBS signal over the reversing camera power supply module to the COMAND controller unit.

The COMAND controller unit then activates the Audio/COMAND display over the telematics CAN and sends picture data over the LVDS line. The Audio/COMAND display then shows the pictures recorded by the reversing camera.

After reading out the reverse gear the reversing camera is active for t = 15 s (power-down). The power supply is set up by the reversing camera power supply module over the rear SAM control unit with circuit 30.

Model 204.0/2 as of 1.3.11, model 204.9 as of 1.12.10 and model 204.3

The reversing camera constantly sends pictures from circuit 15R as a CVBS signal to the COMAND controller unit. The reversing camera projects static guide lines onto these pictures. The pictures on the Audio/COMAND display are not shown until reverse gear or the gear range "R" is engaged.

The "reverse gear engaged" signal flow is equivalent to model 204.0/2 up to 28.2.11 and model 204.9 up to 30.11.10.

The COMAND controller unit then activates the Audio/COMAND display over the telematics CAN and sends picture data over the LVDS interface. The Audio/COMAND display then shows the pictures recorded by the reversing camera.

	Electrical function schematic, reversing camera	Model 204.0/2 up to 28.2.11 Without code (498) Japan version Model 204.9 up to 30.11.10 without code (498) Japan version	PE54.65-P-2051-97FAB
		Model 204.0/2 as of 1.3.11, model 204.9 as of 1.12.10 Without code (498) Japan version Model 204.3	PE54.65-P-2051-97FAC
	Overview of system components of parking assistance systems		GF54.00-P-9997CE