Pioneer GEX-P920xm

Me007gold

Original poster
Member
Nov 20, 2011
1,106
I am going to install my new headunit tommorrow AVH-3300BT with the gmos04, with the p920xm tuner, on the installation instructions it says to use a terminal always supplied with power regardless of ignition switch position. It also says do not run power wire to the battery through the fire wall. What wire should I attach the power wire to to get the power?
 

blazinlow89

Member
Jan 25, 2012
2,088
The constant wire should be in the harness. The ignition wire is the one there. I installed my stereo with just a cheap ebay harness, do not really need the modules. I did tap into my ignition wire under the steering wheel for power though. Works perfect with no issues.
 

MAY03LT

Member
Nov 18, 2011
3,422
Delmarva
Where I would get power would depend on where it would be installed. If it's going up near the radio, I would tie it in to the yellow wire in the 24 pin connector of the gmos04 with the radios memory lead.

I have to admit, I've never seen a manufacturer specifically say to not go through the firewall to the battery. Maybe they had too many units returned because of the hacks running the leads through the door jambs.
 

MAY03LT

Member
Nov 18, 2011
3,422
Delmarva
In that case I would get it at the yellow wire that I mentioned above.:yes:
 

MMIN

Member
Feb 26, 2012
55
The way the power harness for the GEX-P920 is setup you have the yellow power wire at the same end that plugs into the radio, and the ground at the opposite end where it plugs into the module (in order to keep the ground lead short). You want to tap the yellow into the yellow constant wire off of the radio which goes to the orange constant wire in the vehicle harness. Ignition would work but you would lose your XM presets everytime you turn the vehicle off so definately tap it into constant. The reason they mention not to go to the battery is for a couple reasons. Mostly because it isn't necessary and increases the risk of noise. That tuner draws very little current so tap it right in with the radio and you will be fine. On the other end like you I always mount the sirius/xm tuner right in place of the OEM tuner on the passenger underdash panel and use the OEM antenna. I pull the kick back slightly and ground in the kick. Being such a short run you could get away with extending the ground to tap in behind the radio, or figure out which wire is ground in the OEM tuner harness and use that. And another thing that throws people off when hooking them up. The end with the blue ipbus goes into the back of the radio, and the black end at the tuner plugs into the black plug. Mix those up and everything recognizes but no audio from the Xm.
 

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