Faulty Combination Headlight Switch
Combination Headlight Switch harness is open or shorted
Combination Headlight Switch circuit poor electrical connection
Faulty Multiplex Integrated Control Unit (MICU)
Engine Light ON (or Service Engine Soon Warning Light)
The Multiplex Integrated Control Unit (MICU) monitors the Headlight Switch Position. The MICU sets the OBDII code when the Headlight Switch Position is not to factory specifications.