DTC B0502: Right Daytime Running Lights Relay Circuit (Open Or Short To Ground): Description

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Body Control Module (BCM) grounds Light Green wire to energize right Daytime Running Lights (DRL) relay and right front turn signal. This allows right front turn signal to be used in DRL, Underhood Theft Deterrent (UTD) and approach lighting functions.

BCM monitors voltage level on Light Green wire. When BCM activates right DRL relay, voltage level in right DRL relay control circuit should be low. When relay is not activated, voltage level in right DRL relay control circuit should be high.

DTC B0502 will set when BCM detects a low voltage level in Light Green wire for 2 seconds when it is not energizing right DRL relay. No driver warning message will be displayed.

DTC B0502 requires an ignition cycle to change from current to history. If conditions for malfunction no longer exist, history DTC will clear after 50 consecutive ignition cycles. DTC B0502 will also clear when conditions no longer exist, and Instrument Panel Cluster (IPC) or scan tool is used to clear codes.

NOTE: If DTC B0502 is a history code, problem may be intermittent. Wiggle wires while performing the following test.