Version 24.09.2019
HW CANM(V98)/(V34)
RL4-UCON8-CP
P
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24
3.
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.
The ribbon cables have been
damaged
Check the ribbon cables and the connectors,
Change if necessary.
Not all connectors have been
reconnected to the head unit
and the monitor.
Check the connectors and reconnect all
disconnected connections.
No power on video-interface
(daughter PCB)
Make sure that the orange colored wire has been
connected to +12 V S-Contact.
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.
Make sure that the video source has been
connected to the according input.
Ribbon cable connection has
been reversed
Make sure that the ribbon cable connection is
done correctly:
“MONITOR OUT or TO LCD” to panel and
“TO PCB” to mainboard
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 distorted,
flickering or running
vertically.
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 black.
Camera power taken directly
from reverse gear lamp.
Use relay or electronics to "clean" reverse gear
lamp power. Alternatively, if CAN-bus box is
compatible with the vehicle, camera power can
be taken from green wire of 6pin to 8pin cable.
Camera input picture has
distortion.
Not possible to switch
video sources by external
keypad.
Not possible to switch
video sources by external
keypad.
Pressed too short.
For video source switching a longer press of
about 2.5 seconds is required.
Interface does not switch to
camera input when reverse
gear is engaged.
The grey wire of the 6pin
cable doesn’t receive the
+12V reverse signal
Apply +12V from the reverse light. Use a relay or
electronics to "clean" reverse gear lamp power.
