I pulled the plastic cover off that conceals the back trunk wall on my 2000 SSEi. I was surprised to find three good-size electronic boxes mounted to the wall (behind the back seat) including what looks to be a power supply. Does anyone know what this equipment is? I assume it is the OnStar transmitter/ receiver/ GPS, but I'm curious to find out for sure.

Thx//

Theres More than 3 rear devices back there, intergration module, stereo amplifier, Onstar® GPS Antenna, Vehicle Interface Unit, Vehicle Communication Unit.

If you dont have onstar the devices may not be there but the connetors will.

Is the black unit on the left side that looks like an amp the Bose stereo amp?

...very good!,.........now tell us where the StabiliTrak yaw sensor / lateral accelerameter unit is located in the car.. :?:

Lateral Accelerometer Sensor is located under rear bench seat adjacent to rear fuse block. Yaw Rate Sensor located under rear shelf toward left side area.

yup thats where they are, good one Markwb

You guys think it'* bad for my mighty powerful subs to be firing basicly directly at all that good electronic stuff?