Possible Causes

Malfunction is detected when:

• An ON signal from stop lamp switch and ASCD brake switch are sent to ECM at the same time when vehicle speed is more than 19 MPH.
• ASCD brake switch signal is not sent to ECM for an extremely long time while driving vehicle.

Possible causes are:

• Stop lamp switch circuit open or shorted.
• ASCD brake switch circuit open or shorted.
• Defective ASCD brake switch.
• Defective stop lamp switch.
• Incorrect stop lamp switch installation.
• Incorrect ASCD brake switch installation.
• Defective ECM.