Car-Interface RL4-MBN6 User manual

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Video inserter
RL4-MBN6
Compatible with Mercedes Benz vehicles with
MBUX/NTG6 with 7inch or 10.25inch monitor
Video-inserter for front- and rear-view camera
and two more video inputs
Product features
•Video-inserter for factory-infotainment systems
•1 CVBS Input for rear-view camera
•1 CVBS Input for front camera
•2 CVBS Video-inputs for after-market Video sources (e.g. DVD-Player, DVB-T Tuner)
•Automatic switching to rear-view camera input on engagement of the reverse gear
•Automatic front camera switching after reverse gear for 10 seconds
•Activatable parking guide lines for rear-view camera (not available for all vehicles)
•Video-in-motion (ONLY for connected video-sources)
•Video-inputs NTSC and PAL compatible

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Contents
1. Prior to installation
1.1. Delivery contents
1.2. Checking the compatibility of vehicle and accessories
1.3. Boxes and connectors –video interface
1.4. Settings of the 8 Dip switches (black)
1.4.1. Adjustment –power supply output (dip 1)
1.4.2. Enabling the interface’s video inputs (dip 2-3)
1.4.3. Rear-view camera settings (dip 5)
1.4.4. Activating –front camera back-switching (dip6)
1.4.5. Activating the guide lines (dip 7)
1.4.6. Monitor selection (Dip 8)
1.5. Settings of the 4 Dip switches (CAN function –red)
2. Installation
2.1. Place of connection
2.1.1. Removing the MBUX head-unit in the Sprinter (W907)
2.1.2. Place of installation –RL4-MBN6
2.2. Connection schema
2.3. Connection
2.3.1. Picture signal cable - Head unit type 1
2.3.2. Picture signal cable - Head unit type 2
2.3.3. 10pin Power/CAN cable
2.3.4. Installation with connection to CAN bus or analogue (without CAN bus)
2.3.4.1. Place of connection
2.3.4.2. Alternative connection point Power/CAN - Sprinter W907/910
2.3.4.3. Installation with analogue connection (without CAN-Bus)
2.3.5. After-market rear-view camera
2.3.5.1. Case 1: Interface receives the reverse gear signal
2.3.5.2. Case 2: Interface does not receive the reverse gear signal
2.3.6. Power supply output
2.3.6.1. After-market front camera
2.4. Connection - video-interface and external keypad
2.5. Connection - video-sources
2.6. Audio insertion
2.7. Picture settings and guide lines
3. Interface operation
4. Specifications
5. FAQ –Trouble Shooting-Interface functions
6. Technical support

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Legal Information
By law, watching moving pictures while driving is prohibited, the driver must not be
distracted. We do not accept any liability for material damage or personal injury resulting,
directly or indirectly, from installation or operation of this product. Apart from using this
product in an unmoved vehicle, it should only be used to display fixed menus or rear-view-
camera video when the vehicle is moving (for example the MP3 menu for DVD upgrades).
Changes/updates of the vehicle’s software can cause malfunctions of the interface. Up to
one year after purchase we offer free software-updates for our interfaces. To receive a free
update, the interface has to be sent in at own cost. Wages for de-and reinstallation and
other expenditures involved with the software-updates will not be refunded.
1. Prior to installation
Read the manual prior to installation. Technical knowledge is necessary for installation. The
video interface’s place of installation must be free of moisture and away from heat sources.
Before the final installation in the vehicle of the video sources, we recommend a test-run
to ensure the compatibility of vehicle and interface. Due to changes in the production of
the vehicle manufacturer there’s always a possibility of incompatibility.
1.1. Delivery contents
Take down the serial number of the interface and store this manual for support
purposes: ____________________

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Requirements
Brand
Compatible vehicles
Infotainments
Mercedes Benz
A-Class (W177) since 05/2018
B- Class (W247) since 12/2018
Citan (W420) since 10/2021
CLA Coupé (C118) since 03/2019
CLA Shooting B (X118) since 07/2019
EQC (N293) since 2019
GLA (H247) since model year2020
GLB (X247) since 09/2019
GLC Class (X253) since model year 2019
GLE Coupé (C167) since model year 2019
GLE SUV (W167) since model year 2019
GLS- Class (X166) since model year 2019
Sprinter (W907/910) since model year 2018
V-class (W447) since about 03/2020
MBUX with 7inch monitor
without navigation: MB order code E3M
with navigation: MB order code E3M+E1E
or
Comand Online NTG6 - MBUX
with 10.25inch monitor
MB order code: E4M
Limitations:
Video only The interface inserts ONLY video signals into the infotainment. For inserting
Audio signals either the possibly existing factory audio-AUX-input or a FM-
modulator can be used. If 2 audio sources shall be connected to the
infotainment, an additional electronic is necessary to switch them.
Factory rear-view camera Automatically switching-back from inserted video to factory rear-view camera
is only possible while the reverse gear is engaged. To delay the switch-back an
additional electronic part is required.
After market front camera The front camera will automatically be switched for 10 seconds after
disengaging the reverse gear. A manually front camera switching is possible by
external keypad.
Guide lines Available for vehicles with 7 inch monitor, for vehicles with 10 inch monitor
only limited available. If the interface does not receive the required
information from the vehicle CAN-bus, guide lines won’t be supported
generally.
Factory OBD socket The permanent connection of an OBD dongle product, e.g. for a tank app or an
electronic driver's logbook, may result in partial failure of switching to the rear
view camera. if the switching signal is obtained from the CAN bus. In this case
an external switching signal from the reverse gear light and an ordinary open
relay or filter are required for the installation of a rear-view camera (see
chapter: "Case 2: Interface does not receive a reverse gear signal").
Vehicles with active
Park assistant system 235 While the factory active park assistant system 235 is in use, the displaying of
the camera picture is not possible.
1.2. Checking the compatibility of vehicle and accessories

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1.3. Boxes and connectors –video interface
The video-interface converts the connected after-market sources video signals into a LVDS
signal which is inserted in the factory monitor using separate trigger options. Further it reads
the vehicle’s digital signals out of the vehicle’s CAN-bus and converts them for the video
interface.
There are 2 different interface versions:
➢Version with 6-dip switches on the top of the housing
➢Version without 6-dip switches on the top of the housing

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1.4. Settings of the 8 Dip switches (black)
Some settings have to be selected by the dip-switches on the
video interface. Dip position UP = OFF and DOWN = ON.
*The front camera will automatically be switched for 10 seconds after disengaging the
reverse gear.
See the following chapters for detailed information.
1.4.1. Adjustment –power supply output (dip 1)
If set to ON, the video interfaces’ red wire will supply +12V (max 3A) with engaging the
reverse gear and additionally 10 more seconds delay for the time of the front camera’s back-
switching after the reverse gear has been disengaged. Furthermore, the red wire’s power
supply for the front cam becomes active with manually front camera switching (short press
of the external keypad).
If set to OFF, the video interfaces’ red wire will supply permanent +12V ACC (max 3A).
Description of the power supply output: see chapter “Power supply output”.
Dip
Function
ON (down)
OFF (up)
1
Frontkamera
enabled*
disabled
Power supply output
(red wire)
+12V (max. 3A) when reverse
gear is engaged incl. 10
seconds delay and +12V by
manual switching to front
camera by keypad
+12V (max. 3A) ACC
2
CVBS Video 1-input
enabled
disabled
3
CVBS Video 2-input
enabled
disabled
4
No function
set to OFF
5
Rear-view cam type
after-market
factory or none
6
*Frontcam
back-switching
for 10 seconds
*enabled
disabled
7
Guide lines
Version with 6dips on top
Enabled (only 7inch monitor)
disabled
Guide lines
Version without 6dips on top
Enabled (all monitor sizes)
disabled
8
Monitor selection
7inch monitor
10.25inch monitor

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1.4.2. Enabling the interface’s video inputs (dip 2-3)
Only the enabled video inputs can be accessed by switching through the interface’s video
sources. It is recommended to enable only the required inputs. Then the disabled inputs will
be skipped while switching through the video interfaces inputs.
Note: Dip 4 is out of function and has to be set to OFF!
1.4.3. Rear-view camera settings (dip 5)
If set to OFF, the interface switches to factory picture while the reverse gear is engaged to
display factory rear-view camera or factory optical park system picture.
If set to ON, the interface switches to its rear-view camera input while the reverse gear is
engaged.
1.4.4. Activating –front camera back-switching (dip 6)
If set to ON, the interface switches for 10 seconds from the rear-view camera to the front
camera input after having disengaged the reverse gear. In addition, a manual switch-over to
the front camera input is possible via keypad (short press) from any image mode.
(Attend to correct adjustment of the power supply output (dip1)!
1.4.5. Activating the guide lines (dip 7)
If set to ON, the guidelines will be shown on the display. If set to OFF, the guide lines won’t
be visible on the display.
•Version with 6-dip switches on the top of the housing:
Guide lines are only possible for infotainments with a 7inch monitor.
•Version without 6-dip switches on the top of the housing:
All monitor sizes can be supported with guide lines
Note: If there is no communication between interface and the vehicle`s CAN-bus (several
vehicles aren’t compatible), the reverse gear guide lines can`t be shown during the vehicle’s
operation, even if they once appear after having switched the system to powerless.
1.4.6. Monitor selection (Dip 8)
Dip 8 customizes the monitor-specific video settings.
If the monitor doesn’t give a satisfying picture, change the dip position while a working video
source is connected to the chosen input of the interface.
Disconnect the 10pin plug at the interface box between every change of the dip setting.
After each Dip-switch-change a power-reset of the interface box has to be performed!

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1.5. Settings - 6 Dip switches (Top of box–black)
The 6 dip switches at the top of the video interface are responsible for the according
monitor assignment.
Attention: In contrast to both other dip benches (8dip and
4dip), the 6dip position UP = ON and DOWN = OFF!
Monitor size
Dip 1
Dip 2
Dip 3
Dip 4
Dip 5
Dip 6
7inch monitor
Sprinter (W907/910)
GLC (X253)
OFF
OFF
ON
ON
ON
OFF
7”inch monitor
A-Class (W177)*
B- Class (W247)*
CLA Coupé (C118)*
CLA Shooting B (X118)*
GLA (H247)*
GLB (X247)*
OFF
OFF
OFF
ON
OFF
OFF
10.25 inch monitor
Sprinter (W907/910)
A- Class (W177)
B- Class (W247
CLA Coupé (C118)
CLA Shooting B (X118)
EQC (N293)
GLA (H247)
GLB (X247)
GLC (X253)
GLE Coupé (C167)
GLE SUV (W167)
GLS- Class (X166)
OFF
OFF
OFF
OFF
OFF
OFF
Complete list of vehicle model and year –see page 4
*If there is a malfunction in vehicles with 7 inch monitor, try also the other dipswitch settings!
1.6. Settings of the 4 Dip switches (CAN functions –red)
All 4 dip-switches of the video interface have no function for
normal use and have to be set to OFF.
Dip position UP = OFF and DOWN = ON.
Vehicle/Navigation
Dip
1
Dip 2
Dip 3
Dip 4
All vehicles
OFF
OFF
OFF
OFF
Vehicles with factory
active park assistant system 235
ON
OFF
OFF
OFF
Note: During the use of the factory active park assistant system 235, no camera image is available.
After each Dip-switch-change a power-reset of the interface-box has to be performed!

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2. Installation
To install the interface, first switch off the ignition and disconnect the vehicle’s battery.
Please read the owner`s manual of the car, regarding the battery`s disconnection! If
required, enable the car`s Sleep-mode (hibernation mode)
In case the sleep-mode does not succeed, the disconnection of the battery can be done
with a resistor lead. If the necessary stabilized power supply for the interface is not taken
directly from the battery, the chosen connection has to be checked for being constantly
stabile. The interface needs a permanent 12V source!
2.1. Place of connection
Depending on the vehicle model, the place of installation of the MBUX head unit to which
the connection is made, varies.
Examples:
•A-Class (W177), B-Class W247), GLA (H247): On the A-pillar on the driver's side
•GLE (W167 und C167): Under the passenger seat
•Sprinter (W907/910): Behind the factory monitor
2.1.1. Removing the MBUX head-unit in the Sprinter (W907)
Remove air vents by using MB special tool.
Remove one hidden screw under each air vents
Remove front cover –monitor will stay in front.
Remove the head-unit.

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2.1.2. Place of installation - RL4-MBN6
The installation of the interface box close to or behind the MBUX head unit should generally
be avoided in all vehicles due to thermal problems, as the head-unit has a very high heat
generation.
Particularly in the Sprinter W907/910 in the area around the MBUX head unit exists high
heat generation due to solar radiation and the heating pipes. For the Sprinter W907/910, it
is recommended to install the video interface in the centre console below the MBUX system,
as shown in the pictures.

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2.2. Connection schema

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2.3. Connection

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2.3.1. Picture signal cable - head unit type 1
If a pink/bordeaux Double Fakra is present at the head unit’s rear-side, the picture signal
cable has always to be connected to the pink/bordeaux one.
Remove the head unit and disconnect the rearside’s pink-bordeaux coloured female double Fakra
connector.
Connect the picture signal cable’s white coloured female Double Fakra connector to the
male double Fakra connector of the video interface.
Disconnect the female double Fakra connector at the head unit’s male pink-bordeaux
coloured Double Fakra connector and connect it to the male waterblue coloured double
Fakra connector of the enclosed picture signal cable.
Connect the picture signal cable’s waterblue coloured female Double-Fakra connector to the
head unit’s previously become free pink-bordeaux coloured Double-Fakra connector.
Attention: The picture signal cabel’s connection has always to be done at the head unit’s
Double Fakra, even if only one side of the factory Double Fakra is occupied!

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2.3.2. Picture signal cable head unit type 2
If no pink/bordeaux Double Fakra is present at the head unit’s rear-side, the picture signal
cable has to be connected to the green one.
Remove the head unit and disconnect the rearside’s green female double Fakra connector.
Connect the picture signal cable’s white coloured female Double Fakra connector to the
male double Fakra connector of the video interface.
Disconnect the female double Fakra connector at the head unit’s male green coloured
Double Fakra connector and connect it to the male waterblue coloured double Fakra
connector of the enclosed picture signal cable.
Connect the picture signal cable’s waterblue coloured female Double-Fakra connector to the
head-unit’s previously become free green coloured Double-Fakra connector.

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2.3.3. 10pin Power / CAN cable
Connect the 10pin power / CAN cable’s female 10pin connector to the 10pin connector
of the video interface.
Connect the single black wire of the 10pin Power / CAN Cable to stabile vehicle’s
negative ground.
Connect the single yellow wire of the 10pin power/CAN cable to +12V permanent and
stabile power supply.
Connect the single grey wire of the 10pin power / CAN cable to the vehicle’s CAN-Low
Connect the blue wire of the 10pin Power / CAN Cable to the vehicle’s CAN-High.
Connection diagrams: see next chapter

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2.3.4. Installation with connection to CAN bus or analogue (without CAN bus)
The RL4-MBN6 can be integrated via CAN bus as well as operated in analogue mode without
CAN bus.
When integrated via CAN bus, the interface is switched on by the vehicle’s CAN-Bus and the
R-gear signal is usually recognised, too (not all vehicles).
With the MBUX with 7 inch monitor, some vehicles can display guide-lines. To avoid CAN bus
incompatibility or to comply with vehicle manufacturer policies, an analogue connection
without using the vehicle’s CAN-BUS is also possible. In this case, via +12V switch inputs, the
interface is switched on and switched to the rear-view camera input.
If connected analogue, guide-lines can’t be shown.
2.3.4.1. Connection points/CAN –all vehicles
Attention: The two CAN wires may only be connected at the following specified points.
Tapping the CAN information at other points can cause malfunctions.
Head Unit Type 1 with
pink-bordeaux Double-Fakra
Alternatively, the plug&play connection can be made with article PNP-MBUX31P.
Head Unit Type 2 with Double-Fakra
Alternatively, the plug&play connection can be made with article PNP-MBUX31P.
** The CAN bus colours on the vehicle can also be yellow/white and yellow!
Pin-assignment RL4
10pin Power/CAN
Pin-Belegung Type 1
black 26pin
locking connector
•CAN High blue
••Pin 7 purple white **
•CAN Low grey
•Pin 20 purple **
•+12V battery yellow
•Pin 14 red
•Ground black
•Pin 1 brown
Pin-assignment RL4
10pin Power/CAN
Pin-assignment Type 2
white 31pin connector
•CAN High blue
••Pin 15 purple white **
•CAN Low grey
•Pin 22 purple **
•+12V battery yellow
•Pin 1 red
•Ground black
•Pin 6 brown

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2.3.4.2. Alternative connection point Power/CAN - Sprinter W907/910
As an alternative connection option, if an RVC preinstallation (code FR7) exists,
Power and CAN can also be tapped at the 4-pin socket with the same cable colours under
the driver's seat for both HU types.
Note: The factory FR7 RVC preparation is only
present:
for Type 1 –If the blue single fakra on the head
unit is connected
for Type 2 –If the green double fakra is
twice-connected on the head unit.
There`s no liability for the vehicle`s pin diagram! Changes in the manufacturer`s
production are possible any time. The mentioned information has to be verified by the
installer.
Pin-assignment RL4
10pin Power/CAN
Head-units with FR7
RVC pre-fitting
Type 1 und Type 2
•CAN High blue
••purple white
•CAN Low grey
•purple
•+12V battery yellow
•red
•Ground black
•brown

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2.3.4.3. Installation with analogue connection (without CAN-Bus)
Connect the enclosed 12pin interface cable’s female 12pin connector to the male
12pin connector of the video interface.
Connect the purple coloured wire Manual ACC of the 12pin interface cable to
S-contact terminal 86s +12V (e.g. glove compartment illumination).
Note:
Only as long as the video interface is switched on via +12V and Manual ACC,
the MBUX screen is also switched on. Otherwise, the factory picture is black.
When selecting the switch signal, please check whether the factory picture is
available in all desired operating states.
With analogue connection of the video interface (without CAN bus), the connection
of the rear-view camera must also be made manually.
(see point 2.3.5.2.: Case 2: Interface does not receive a reverse gear signal).

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2.3.5. After-market rear-view camera
Some vehicles have a different reverse gear code on the CAN-bus which the video-interface
is not compatible with. Therefore, there are two different ways of installation. If the video
interface receives a signal of the reverse gear, the green wire “Reverse-OUT” of the 20pin
cable should carry +12V while the reverse gear is engaged.
Note: Do not forget to set video interface’s dip5 to ON before testing.
2.3.5.1. Case 1: Interface receives the reverse gear signal
If the interface delivers +12V on the green output wire of the 12pin interface cable while
reverse gear is engaged, the video interface will automatically switch to the rear-view
camera input “Camera IN” while the reverse gear is engaged.
Additionally, the +12V (max. 3A) power supply for the rear-view camera can be taken
from the green wire of the 12pin interface cable.
Note: The permanent connection of an OBD dongle product, e.g. for a tank app or an
electronic driver's logbook, may result in partial failure of switching to the rear-view camera.
if the switching signal is obtained from the CAN bus. In this case, connect the rear-view
camera as described in the following chapter "Case 2".

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2.3.5.2. Case 2: Interface does not receive the reverse gear signal
If the video interface does not deliver +12V on the green wire of the 12pin cable when
reverse gear is engaged (not all vehicles are compatible), an external switching signal from
the reverse gear light is required. As the reverse gear light’s power supply isn’t voltage-
stabile all the time, an ordinary open relay (e.g AC-RW-1230 with wiring AC-RS5) or filter
(e.g. AC-PNF-RVC) is required. The diagram below shows the connection type of the relay.
Disconnect the green cable’s preconnected male- and female connectors of the 12pin
interface cable and connect the green input cable “Reverse-IN” to the output
connector (87) of the relay.
Note: Last but not lot least to avoid short circuits, the best solution should be, to
crimp a male 4mm connector to the relay’s output cable and connect it to the green
cable’s female 4mm connector. The output-cable “Reverse-OUT” remains
disconnected as it’s out of function.
Connect the Reverse light’s power-cable to coil (85) and the vehicle’s ground to coil
(86) of the relay.
Connect the output connector (87) of the relay to the rear-view camera’s power-
cable, like you did it to the green “Reverse-IN” cable before.
Connect stabile and permanent +12V to the relay’s input connector (30).