Circuit Description
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The power sliding door control module (PSDM) uses an optical sensor to monitor the power sliding door (PSD) position at all times. The optical sensor requires a 5-volt reference circuit and a reference return circuit from the PSDM. There are also 2 signal circuits from the PSDM to the optical sensor. The optical sensor sends pulses through both signal circuits to the PSDM whenever the PSD is in motion. The optical sensor pulses allow the PSDM to calculate the position of the PSD at all times. The optical sensor signal circuits switch from 0.01-4.5 volts as the PSD is moving.