DTC B2575: ALC Headlight System Fault: Description

Body Control Module (BCM) uses Pink/White wire to ground Automatic Lighting Control (ALC) relay coil. DTC B2575 indicates that headlights were not on when ALC relay output was on. DTC B2575 will set when ALC option is enabled and ignition 1 input is active, ALC headlight output is active and CIRCUIT 1970 (Pink/White wire) is open for 5 seconds. When DTC B2575 is set, SERVICE VEHICLE SOON indicator will illuminate and chime will sound. DTC B2575 can be cleared when BCM reads proper headlight voltage, using scan tool or when fault conditions no longer exist.