Circuit Description
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The stop lamp switch is used to sense the action of the driver application of the brake pedal. The stop lamp switch is a normally open switch that, when applied, provides a B+ analog voltage to the transmission control module (TCM).
When the TCM detects an open stop lamp switch circuit, 0-volts, during a calibrated number of decelerations, then DTC P0719 sets. DTC P0719 is a type C DTC.