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Bavarian Soundwerks' Mobile Electronics Forum
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Old 06-14-2009, 12:21 AM   #1
xaiolin
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12V constant wire question

I bought a 12v test light and found out that I have two 12v constant wires and one 12v switched. One 12v constant is red/green and the other is
white/red/yellow.... the 12v switched is purple/white. Does anyone know which is the "true constant" that I should be connecting my radio positive wire to? Also, why are there two?
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Old 06-14-2009, 01:09 AM   #2
jay2001
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Please say that you did not use one of those light bulb test wands to the White/Red/Yellow lead? This is a data line and not suppose to ever see a low impedance load. I hope that everything is okay after you put things back together. In the high technology age we are in, Please use a high imedance tester like a DVM and throw that wand away before you trigger an air bag.
The constant +12 is the Red/Green.
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Old 06-14-2009, 01:11 AM   #3
GTUnit
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^ good advice right there
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Old 06-14-2009, 08:33 AM   #4
xaiolin
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Originally Posted by jay2001 View Post
Please say that you did not use one of those light bulb test wands to the White/Red/Yellow lead? This is a data line and not suppose to ever see a low impedance load. I hope that everything is okay after you put things back together. In the high technology age we are in, Please use a high imedance tester like a DVM and throw that wand away before you trigger an air bag.
The constant +12 is the Red/Green.
thanks
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Old 06-14-2009, 12:27 PM   #5
packrat555
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he is referring to the ibus line
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Old 06-14-2009, 01:24 PM   #6
xaiolin
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Originally Posted by packrat555 View Post
he is referring to the ibus line
thanks, i appreciate this
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Old 06-14-2009, 02:55 PM   #7
xaiolin
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Originally Posted by packrat555 View Post
he is referring to the ibus line
Do you know what these do:

I-Bus
12v Acc
12v Ilum
12v Ant out
Phone Mute

Last edited by xaiolin; 06-14-2009 at 03:05 PM.
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Old 06-14-2009, 11:36 PM   #8
packrat555
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I-Bus is the data link for the car don;t touch that unless you re hooking some kind of ipod interface and they instruct you
12V ACC is the 12V that is switched on with the ignition
12V Ilum is the voltage to the radio display light, used so that it will be controlled by the dimmer like the rest of your gauges
12V Ant Out is used to control a power antenna (I think)
Phone Mute somehow works with the bluetooth kit. There is a corresponding button on the steering wheel, I wish there was a way for it to simply must the radio when pressed but I don;t think anything like that is possible.
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Old 06-15-2009, 07:11 PM   #9
xaiolin
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Originally Posted by packrat555 View Post
I-Bus is the data link for the car don;t touch that unless you re hooking some kind of ipod interface and they instruct you
12V ACC is the 12V that is switched on with the ignition
12V Ilum is the voltage to the radio display light, used so that it will be controlled by the dimmer like the rest of your gauges
12V Ant Out is used to control a power antenna (I think)
Phone Mute somehow works with the bluetooth kit. There is a corresponding button on the steering wheel, I wish there was a way for it to simply must the radio when pressed but I don;t think anything like that is possible.
thanks man... im trying to figure out why my cd player and aux arent working but the radio is
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