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Daytime Running Lamp Control Circuit High Diagnostic Fault Information DTC B2602 or B2603 Circuit/System Description The daytime running lights (DRL) relay is controlled by the body control module (BCM). Battery Conditions for Running the DTC The ignition switch is in the RUN position. The headlamp switch is in the AUTO position. The park brake is not applied. The gear selector is not in the PARK position. Conditions for Setting the DTC One of the following conditions must occur: The DRL relay control circuit is open, shorted to ground or shorted to voltage. The DRL relay coil is open. The battery positive voltage to the DRL relay is open. Action Taken When the DTC Sets The BCM stores DTC B2602 or B2603 in memory. The BCM disables the DRL relay control as long as the fault is present. The BCM disables the DRL relay control until the next key cycle after the fault is corrected. Conditions for Clearing the DTC A current DTC B2602 or B2603 clears when the BCM no longer detects an open, short to Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance DRL Control Circuit B2602 B2602 B2603 -
2007 Hummer H3 2007 ACCESSORIES & EQUIPMENT Lighting - H3
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