Jeep Compass Ignition M2-ATX

**plunderisley** · 08-15-2007, 12:47 AM

I took apart the jeep compass HU and got all the wires figured out except the ignition power.
There are 2 + from the battery and 2 grounds, but no + igntion cables. I tested the + with a voltmeter to be sure.
For the M2-atx, how would that work?

--- + battery
--- + ignition
--- ground
?
and for the amp, would the power remote (12V or something) plug into the m2-atx board? (for that anti-thump)

**DarquePervert** · 08-15-2007, 07:13 AM

Tap into any line that is switched by the ignition.
Likely sources are the headunit wiring harness and a cigarette lighter (assuming it's only functional when the car is on)

I can't help you with the remote amp wire. It should say something about that in the manual, though.

**plunderisley** · 08-15-2007, 08:08 AM

could I safely run the amp, computer and whatever is plugged into the cigarette outlet all on 1 wire from the cigarette outlet?

**DarquePervert** · 08-15-2007, 11:27 AM

No.

The cigarette lighter was a suggestion for the ACC line that the M2ATX requires to trigger startup/shutdown of the PC. The M2 simply senses voltage on this line, so the amount of power draw is negligible.

The circuit for a cigarette lighter is not designed to provide current sufficient to power an amplifier or PC.
You're going to want to run a power line directly to the battery to power these. Considering the setup you're looking at, I'd suggest a power line of 4awg (or lower, depending on the anticipated draw) going to a fused distribution block, with thinner wire going to the amplifier(s) and PC.

My setup is similar to this. I have two modest amplifiers and the PC (dead, as of now). One 4awg power line running straight from the battery to a distribution block that handles both power and ground lines.

**plunderisley** · 08-16-2007, 01:33 AM

Err I mistyped it.
Is the cigarette outlet enough for the m2-atx ignition switch? I have a dedicated power running for the battery +. I did get it to run today.
Also I was able to wire up the remote amp switch to the m2-atx remote amp jumper

**DarquePervert** · 08-16-2007, 06:20 AM

Originally Posted by plunderisley

Err I mistyped it.
Is the cigarette outlet enough for the m2-atx ignition switch? I have a dedicated power running for the battery +. I did get it to run today.
Also I was able to wire up the remote amp switch to the m2-atx remote amp jumper

yes, the cigarette lighter is enough for the ignition switch. IF you have any question, nmeasure the output on it with a multimeter to make sure it goes to +12v with the ignition on and 0v with the ignition off.

The ACC line that is required by shutdown controllers is just used for sensing voltage, nothing more. AS I said, the power draw on that line is negligible.

**plunderisley** · 08-16-2007, 08:14 AM

Originally Posted by DarquePervert

yes, the cigarette lighter is enough for the ignition switch. IF you have any question, nmeasure the output on it with a multimeter to make sure it goes to +12v with the ignition on and 0v with the ignition off.

The ACC line that is required by shutdown controllers is just used for sensing voltage, nothing more. AS I said, the power draw on that line is negligible.

Good.
Exactly what I wanted to hear.

Now to get some sleep and work on finishing my setup today.

**westcoastrocks** · 08-17-2007, 09:09 PM

if that jeep compass is anything like my jeep it has one lighter that is always on and one that is only on when the ignition is on. I used this for my turn on lead and it works great. I did not have to go hunting for wires :P