B1279 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1279 – Dimmer Switch Circuit Malfunction

 

B1279 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1279 Possible Causes

 

Faulty Dimmer Switch,Dimmer Switch harness is open or shorted,Dimmer Switch circuit poor electrical connection,Faulty Multiplex Integrated Control Unit (MICU)

 

B1279 Description

 

The Multiplex Integrated Control Unit (MICU) monitors the Dimmer Switch. The MICU sets the OBDII code when the Dimmer Switch is not to factory specifications.