Offset Voltage?
Thread Starter
MBWorld Fanatic!
Joined: Mar 2007
Posts: 1,518
Likes: 1
From: STL
W203 C230SS
Offset Voltage?
I am in the middle of a full install on my '06 C230. I thought the Rockford 3sixty could always be used as an output for a remote turn on. Turns out it's only if the factory headunit is a voltage offset type. I have no way to test this since the car is all apart. Anyone know? Or can anyone check theirs out for me?
Assuming you have a factory head unit (non bose type)- get out your multitester. Turn the stereo on, place the negative lead on a ground and the positive lead on any speaker wire (positive or negative). It should read 6 volts. If it gives any other reading or no reading at all- it's not an offset voltage type.
Assuming you have a factory head unit (non bose type)- get out your multitester. Turn the stereo on, place the negative lead on a ground and the positive lead on any speaker wire (positive or negative). It should read 6 volts. If it gives any other reading or no reading at all- it's not an offset voltage type.
MBWorld Fanatic!
Joined: Nov 2002
Posts: 1,028
Likes: 133
From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
I don't know if this helps, but I can confirm that the sub-woofer amp on the '07 ML350 with the Harmon-Kardon system is a DC output, bridged design so +6 vdc appears on each of the four (the sub is a dual voice coil unit) output leads when the system is on. I could have used the presence of DC as a "turn on" signal but I chose to tap into the antenna amplifier supply lead instead.
- FD
- FD
