C230 Acc power
Thread Starter
Senior Member
Joined: Dec 2004
Posts: 453
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From: Bay Area, CA
'04 Mars Red C230K Sport Coupe (not Coup-EH)
C230 Acc power
I was installing a new HU in my 2004 C230SC and I couldn't find an ACC power line (+12V that comes on when the car is turned on). I checked all pins against the ground with a multimeter and the constant +12V was the only one I could find. I ended up canabalizing my cigarette lighter to get the ACC power, but I'm curious if there is another solution, as I haven't found any complaints about this in the forums, and I'd like to have my cig lighter back to inflate my emergency tire if I need it.
Thanks in advance.
Thanks in advance.
Junior Member
Joined: Feb 2004
Posts: 40
Likes: 1
From: Sindelfingen, Germany
E350CDI S212, MY2011
Hi,
what you found out, is correct. There is no Acc Power Line (terminal 15R) in your car. The stock head units get there signal via CAN-B. So you can just use a cable splice to get your cig lighter back to life! Be aware the fuse for your cig lighter is a 15A fuse.
what you found out, is correct. There is no Acc Power Line (terminal 15R) in your car. The stock head units get there signal via CAN-B. So you can just use a cable splice to get your cig lighter back to life! Be aware the fuse for your cig lighter is a 15A fuse.
Out Of Control!!
Joined: Dec 2004
Posts: 14,212
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From: Boston, MA
00 MB ML55, 91 Toyota Supra Turbo(sold), 06 E500(gone), 03 BMW M3
15amps is more than enough to run both of those...Acc wire needs only a small current to trip the relay in the radio, the power comes from constant cable not ACC
Junior Member
Joined: Feb 2004
Posts: 40
Likes: 1
From: Sindelfingen, Germany
E350CDI S212, MY2011
Fuse cigarette lighter/ACC Power
@55fanatic,
that's what I was talking about! Of course the headunit just needs a few mA, but if you install the wire, be sure to have a wire with a diameter which fits for the 15A-Fuse!
When using just a very thin wire ("I just need the ACC power with a few Milli Amps"), and then there is a short circuit of your thin wire against ground, you will have a pretty "hot wire" or even a burning car! For this reason, for the ACC signal you should use a wire which has the same diameter as the wire leading to the cigarette lighter.
Greetz from Germany.
that's what I was talking about! Of course the headunit just needs a few mA, but if you install the wire, be sure to have a wire with a diameter which fits for the 15A-Fuse!
When using just a very thin wire ("I just need the ACC power with a few Milli Amps"), and then there is a short circuit of your thin wire against ground, you will have a pretty "hot wire" or even a burning car! For this reason, for the ACC signal you should use a wire which has the same diameter as the wire leading to the cigarette lighter.
Greetz from Germany.
Senior Member
Joined: Mar 2004
Posts: 385
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C32 AMG, CL500, Jag StypeR, SLK200, Aygo, Audi TT
which cable in the cigarette lighter is ACC guys?
Im having areal nightmare trying to get my AVIC-X1 working - just need a bloody ACC cable and I know theres one in the cigarette lighter but which cable is it - what colour etc?
