DTC C1B5D Motor Control Circuit

DTC detecting condition: 

The pump does not operate when the electrically controlled booster sends drive request to the pump motor (faulty relay inside electric booster).

Trouble symptom: 

EyeSight functions (ACC/PCS) do not operate.

1. CHECK DTC  .

   Read the DTC of [Electric Brake Booster] using the Subaru Select Monitor. Ref. to ELECTRIC BRAKE BOOSTER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is only DTC C1B5D displayed?

   Yes:  Replace the brake booster assembly (with the master cylinder). Ref. to BRAKE>BRAKE BOOSTER .

   No:  Perform the diagnosis according to the DTC. Ref. to ELECTRIC BRAKE BOOSTER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .