C1783 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C1783 – Door Courtesy Switch Circuit


C1783 Possible Symptoms


Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)


C1783 Possible Causes


Faulty Door Courtesy Switch,Door Courtesy Switch harness is open or shorted,Door Courtesy Switch circuit poor electrical connection,Faulty Suspension Control ECU


C1783 Description


The door courtesy switch comes on when the door is opened and goes off when the door is closed. Therefore, battery positive voltage is applied to a terminal of the Suspension Control ECU when all the doors are closed and 0 V is applied when even one door is opened.