B1C77 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1C77 – Rear Wiper Relay Circuit

 

B1C77 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1C77 Possible Causes

 

Faulty Rear Wiper Relay,Rear Wiper Relay harness is open or shorted,Rear Wiper Relay circuit poor electrical connection

 

B1C77 Description

 

The Body Control Module (BCM) monitors the Rear Wiper Relay. The BCM sets the OBDII code when the Rear Wiper Relay is not to factory specifications.