Past Trouble
WARNING: This page is about a different car, the 2009 Mitsubishi Eclipse. However, it is still accessible from the selected car via links, so may be relevant.
Carry out diagnosis with particular emphasis on connector(s) or wiring harness between the TCL/ASC-ECU and the stoplight switch. For diagnosis procedures, refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS .