B1100 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1100 – Door Multiplex Control Unit

 

B1100 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1100 Possible Causes

 

Faulty Door Multiplex Control Unit,Door Multiplex Control Unit harness is open or shorted,Door Multiplex Control Unit circuit poor electrical connection

 

B1100 Description

 

The Multiplex Control Unit Module (MICU) monitors the Door Multiplex Control Unit. The MICU sets the OBDII code when the Door Multiplex Control Unit is not to factory specifications.