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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1104 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> DTC B2503 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, observe the scan tool rear closure ajar switch parameter while opening and closing the trunk. The reading should toggle between INACTIVE and ACTIVE.

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