Symptom Chart

Symptom	Possible Causes	Action
Stoplamp(s) inoperative	Bulb failure LED lamp failure Fuse(s) blown Stop lamp circuit short circuit to ground, short circuit to power, open circuit, high resistance Brake pedal switch fault	Check the bulb(s) Check the LEDs Check the fuses Refer to the electrical circuit diagrams and test the stop lamp circuit for short circuit to ground, open circuit, high resistance Using the manufacturer approved diagnostic system, check datalogger signal - Brake Switch (0x0416) Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index
Stoplamp(s) dim	Stop lamp circuit high resistance	Refer to the electrical circuit diagrams and test the stop lamp circuit for high resistance
Stoplamp(s) stuck on	Brake pedal switch fault Stop lamp circuit short circuit to power	Using the manufacturer approved diagnostic system, check datalogger signal - Brake Switch (0x0416) Refer to the electrical circuit diagrams and test the stop lamp circuit for short circuit to power Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index