Big E

Thanks 1loudls. I'll let you know how it turns out.

Ok, so I finally had time to get back into the Navigator. Here's what I found: The park assist sensor module puts out .01 volts in park (yes .01 volts), .04 volts in reverse and .05 volts when the sensors detect an object in reverse. Effectively no voltage. (I did make sure my multimeter was set for the correct level of DC voltage when I saw those numbers) I connected the mute wire to the reverse lamp light circuit. When the car is in park, neutral or any drive gear the volume is attenuated (muted) but when the car is in reverse and the reverse lamps are lit the volume switches to reg

Thank you for the input. I'll check the voltage output from the sensor module. It does make sense to go straight to the beeper as the source or, secondarily, to the reverse lead. I'll keep you posted.

I recently installed 2 x920bt's in our vehicles. It's a great unit. In my wife's 2005 Navigator she has the parking assistance sensors (the ones that beep). I hooked up the mute signal output from the sensor module to the yellow/black mute wire (the mute wire is in its factory location. I added a wire and pin for the GPS/DVD bypass.) and the HU is in full time mute. It seems the sensor module is continuously supplying voltage to the mute wire. I cut the mute wire and the full time mute problem was solved. I would like the reverse sensors to mute the HU as it did on the factory HU. So,