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Version 14.03.2023 

       HW CAN(V100)/GW2A(V20) 

        RL4-UCON8-20 

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FAQ – Trouble shooting Interface functions 

 
For any troubles which may occur, check the following table for a solution before requesting 
support from your vendor.

 

 

Symptom 

Reason 

Possible solution 

No picture/black 
picture (factory 
picture). 

Not all connectors have been 
reconnected to factory head-
unit or monitor after 
installation. 

Connect missing connectors. 

No power on CAN-bus box (all 
LED CAN-bus box are off). 

Check power supply of CAN-bus box. Check CAN-bus 
connection of CAN-bus box. 

CAN-bus box connected to 
CAN-bus in wrong place. 

Refer to the manual where to connected to the CAN-
bus. If not mentioned, try another place to connect to 
the CAN-bus. 

No power on video-interface 
(all LED video-interface are 
off). 

Check whether CAN-bus box de12V ACC on red 
wire output of 8pin to 6pin cable. If not cut wire and 
supply ACC +12V directly to video-interface. 

No picture/black 
picture/white picture 
(inserted picture) but 
factory picture is OK. 

No picture from video source.  Check on other monitor whether video source is OK. 

No video-source connected to 
the selected interface input. 

Check settings dips 1 to 3 of video interface which 
inputs are activated and switch to corresponding 
input(s). 

LVDS cables plugged in wrong 
place. 

Double-check whether order of LVDS cables is exactly 
connected according to manual. Plugging into head-
unit does not work when the manual says to plug into 
monitor and vice versa. 

Wrong monitor settings of 
video-interface. 

Try different combinations of dips 7 and 8 of video-
interface. Unplug 6pin power after each change. 

Inserted picture totally 
wrong size or position. 
Inserted picture double 
or 4 times on monitor. 

Inserted picture 
distorted, flickering or 
running vertically. 

Video sources output set to 
AUTO or MULTI which causes 
a conflict with the interfaces 
auto detection. 

Set video source output fixed to PAL or NTSC. It is best 
to set all video sources to the same standard. 

If error occurs only after 
source switching: Connected 
sources are not set to the 
same TV standard. 

Set all video sources to the same standard. 

Some interfaces can only 
handle NTSC input. 

Check manual whether there is a limitation to NTSC 
mentioned. If yes, set source fixed to NTSC output. 

Inserted picture b/w. 
Inserted picture qual. 
bad. 

Picture settings have not been 
adjusted. 

Use the 3 buttons and the interface's OSD to adjust the 
picture settings for the corresponding video input. 

Inserted picture size 
slightly wrong. 
Inserted picture 
position wrong. 

Camera input picture 
flickers. 

Camera is being tested under 
fluorescent light which shines 
directly into the camera. 

Test camera under natural light outside the garage. 

Camera input picture is 
bluish. 

Protection sticker not 
removed from camera lens. 

Remove protection sticker from lens. 

 
 

 

Summary of Contents for RL4-UCON8-20

Page 1: ...urces 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 devices e g USB Player DVB T...

Page 2: ...connection 2 2 Connection scheme 2 3 Installation daughter PCB 2 3 1 Warning notes concerning the installation of ribbon cables 2 4 Connection picture signal cable 2 5 Connection 10pin Power CAN cabl...

Page 3: ...amera 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 We offer free software updates for ou...

Page 4: ...c 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 electr...

Page 5: ...Version 14 03 2023 HW CAN V100 GW2A V20 RL4 UCON8 20 Page 5 1 3 2 connectors daughter PCB...

Page 6: ...ation The front camera will automatically be switched for 10 seconds after disengaging the reverse gear See the following chapters for detailed information Dip Function ON down OFF up 1 Front camera e...

Page 7: ...3 Rear view camera setting dip 5 If set to OFF the interface switches to factory picture while the reverse gear is engaged to display factory rear view camera If set to ON the interface switches to i...

Page 8: ...th any installation of retrofit equipment a stand by test is neccessary after the installation of the video interface to ensure that the unit also switches off after reaching the vehicle s sleep mode...

Page 9: ...Version 14 03 2023 HW CAN V100 GW2A V20 RL4 UCON8 20 Page 9 2 2 Connection Scheme...

Page 10: ...CAN V100 GW2A V20 RL4 UCON8 20 Page 10 2 3 Installation daughter PCB Remove the factory head unit The enclosed daughter PCB has to be installed into the optical lead between the monitor panel and main...

Page 11: ...ds of ribbon cables always have to be installed in a straight and precise 180 position to the connector Each deviation from a perfect contact position will curse faulty contact and even danger of shor...

Page 12: ...023 HW CAN V100 GW2A V20 RL4 UCON8 20 Page 12 2 4 Connection picture signal cable Connect the female 20pin connector of the pre connected 20pin picture signal cable to the male 20pin connector of the...

Page 13: ...he Video Interface Disconnect the female 52pin connector of the vehicle harness from the rear side of the head unit and connect it to the 52pin PNP connector of the 10pin Power CAN cable Connect the o...

Page 14: ...of the 10 pin power CAN cable shortened by the PNP section to the male 10pin connector of the video interface Connect the single yellow coloured wire to stabile 12V terminal 30 Connect the single bro...

Page 15: ...Connect the female 12pin connector of the 12pin interface cable to the male 12pin connector of the video interface Connect the 12pin interface cable s purple coloured wire Manual ACC to 12V ACC termin...

Page 16: ...can be used to power an external source and has a different assignment depending on the position of dip switch 1 of the black 8 dips Dip Function Dip 1 ON 12V max 3A when reverse gear is engaged incl...

Page 17: ...nges in the production of the vehicle manufacturer there s always a possibility of incompatibility Connect the 12pin interface cable s female 12pin connector to the male 12pin connector of the video i...

Page 18: ...nic is necessary to switch the audio signals 2 9 2 After market front camera The red power supply output ACC front cam out 12V max 3A can be used to power a front camera If Dip 1 is set to ON black 8...

Page 19: ...ged Note Do not forget to set dip5 of the video interface to ON before testing 2 9 3 1 Case 1 Video interface receives the reverse gear signal If the CAN bus interface receives 12V on the green wire o...

Page 20: ...ion type of the relay Disconnect the green cable s pre connected male and female connectors of the 20pin cable and connect the green input cable Reverse IN to the output connector 87 of the relay Note...

Page 21: ...external keypad Connect the keypad s female 4pin connector to the 12pin interface cable s male 4pin connector Note Even if the switching through several video sources by the keypad mightn t be require...

Page 22: ...om the factory video to the inserted video sources Each press approx 2 sec will switch to the next enabled input If all inputs are enabled the order is Factory video video IN1 video IN2 factory video...

Page 23: ...isconnect the keypad from the pushbutton cable after the adjustments are done Adjustments have to be done while the selected input is visible on the monitor Note The OSD menu is only shown when a work...

Page 24: ...24 5 Specifications BATT ACC range 7V 25V Stand by power drain 6mA Power 130mA 12V Video input 0 7V 1V Video input formats NTSC Temperature range 40 C to 85 C Dimensions interface box 116 x 25 x 88mm...

Page 25: ...ether order of LVDS cables is exactly connected according to manual Plugging into head unit does not work when the manual says to plug into monitor and vice versa Wrong monitor settings of video inter...

Page 26: ...y OEM button CAN bus interface does not support this function for vehicle Use external keypad or cut white wire of 6pin to 8pin cable and apply 12V impulses for AV switching Pressed too short For vide...

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