DTC B2603: DRL Control #1 Circuit High: Description

BCM controls left front turn signal by applying power to the control circuit which in turn energizes the left front turn signal. DTC B2603 will be stored in memory if BCM detects a short to battery voltage in control circuit for more than 0.3 second when it is commanding the left front turn signal to energize. SERVICE VEHICLE SOON light will be illuminated when this code is stored in memory.

A current DTC B2603 will clear if short to battery voltage in control circuit is no longer detected by BCM. A history code B2603 will clear after 100 consecutive ignition cycles if conditions for setting DTC are no longer present. A scan tool may be used to clear DTC B2603.