- Faulty Dimmer Switch
- Dimmer Switch harness is open or shorted
- Dimmer Switch circuit poor electrical connection
- Faulty Multiplex Integrated Control Unit (MICU)
- Engine Light ON (or Service Engine Soon Warning Light)
B1279 DescriptionThe Multiplex Integrated Control Unit (MICU) monitors the Dimmer Switch. The MICU sets the OBDII code when the Dimmer Switch is not to factory specifications.
B1279 Information for specific makes
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