I looked at the coding values in FRMFA.C21:
PWM_ANSTEUERUNG_RFS - PULSE-WIDTH MODULATION (PWM) CONTROL OF REVERSING LIGHTS
wert_01 12.2 V
wert_02 12.8 V
wert_03 13.5 V
wert_04 13.2 V
It seems the voltage shouldn't be lower than 12V. I was thinking to increase to higher voltage but you may have a leak somewhere.
Another option is to use the reversing light to trigger a relay and use other source for feeding the camera.
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