Head unit only starts when I start the engine

scorpion2x2

Hi, I have Dudu7 with HiWorld Canbus in e90 BMW, the Head unit only starts when I start the engine! Never starts with ignition on (ACC Mode) only, I have to start the engine to start up the head unit!!! Only turn on when Car engine is running, not in ACC mode?
Any suggestions or solutions?

Thanks

surfer63

scorpion2x2
The two most probable causes:

ACC wire not correctly connected so it doesn't make contact.
ACC and CONT wire are incorrectly and reversely connected. They should probably be switched.

scorpion2x2

May i ask you , which wire is the CONT wire? Is it the G2 B+ 12v yellow wire?

dudu-lai

Hi, use a multimeter tool to measure the voltage at G3 in ACC mode