Problem after install

[arlojanis]

I installed a PM400 UHF in my GMC 2007 pickup. Now sometimes the display light in the factory dash radio/satellite radio will go to dim like for night and then back to bright for no reason. Is there a photo cell type sensor and where is it, or should it just change to dim when headlights are on?

[firefighter13669]

You had this radio after u hooked the radio up? and does this happen only when you tx?

[arlojanis]

Music radio is a factory install and never had this problem before. The display brightness changes happened during the daytime and were not while transmitting.

[Grog]

Are the headlights coming on too? The sensor for my 2002 is on the dash at the base of the windshield. If I cover it up, the truck thinks it is night and turns on the headlights/taillights and dims the other lights.

Tomorrow I can check one of the 2007s at work to see where the sensor is.

[N2ZPY]

My '08 1500 for work has the sensor in the middle of the dash. If it gets a notebook, hat, etc.... thrown over it the lights will come on and radio will dim.

Kevin

[BENWSI]

I recently installed a PM1500 into a Dodge Caravan and when you keyed the mic the radio display flipped upside down! But the radio worked fine and had good reflected power.

Ben