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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1278 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2403 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The front fog lamp switch circuit provides a direct battery input to the BCM when the switch is pressed. This input allows the BCM to detect a front fog lamp switch ON or OFF request. If the BCM detects battery voltage on the front fog lamp switch signal circuit when the front fog lamps are OFF, the BCM will turn ON the lamps by energizing the front fog lamp relay. If the BCM detects battery voltage after the front fog lamps ON command, the BCM will turn OFF the lamps. The BCM monitors the front fog lamp switch signal circuit in order to determine how long the voltage has been applied. If the voltage is applied for longer than expected, a malfunction is present and a DTC will set.

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