Circuit Description

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

DTC will set when following conditions are present:

• Engine speed greater than 700 RPM for 20 seconds.
• Engine operating for greater than 2 seconds.
• 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.
• Conditions met for 1.5 seconds.