Circuit Description

Stoplight switch is normally open. When switch is closed, Throttle Actuator Control (TAC) module senses ignition voltage on brakelight switch signal circuit. DTC will set if TAC module senses voltage on brakelight switch signal circuit when switch should be open.

Conditions for setting DTC are: engine speed greater than 700 RPM, wheel speed greater than 30 MPH to activate diagnostic (diagnostic will be disabled if wheel speed is less than 10 MPH), vehicle speed is decreasing at a rate greater than 10.4 MPH during a one second period.