DTC B0507: Left 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 Orange/Black wire to energize left Daytime Running Lights (DRL) relay and left front turn signal. This allows left front turn signal to be used in DRL, Underhood Theft Deterrent (UTD) and approach lighting functions.

BCM monitors voltage level on Orange/Black wire. When BCM activates left DRL relay, voltage level in left DRL relay control circuit should be low. When relay is not activated, voltage level in left DRL relay control circuit should be high.

DTC B0507 will set when BCM detects a low voltage level in Orange/Black wire for 2 seconds when it is not energizing left DRL relay. No driver warning message will be displayed.

DTC B0507 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 B0507 will also clear when conditions no longer exist, and Instrument Panel Cluster (IPC) or scan tool is used to clear codes.

NOTE: If DTC B0507 is a history code, problem may be intermittent. Wiggle wires while performing the following test.