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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 Testing

Circuit/System Testing

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.
  1. Ignition OFF, disconnect the harness connector at the rear compartment lid latch.
  2. Ignition OFF, test for less than 5.0 ohms between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool ext. trunk/liftglass rel. sw. parameter is INACTIVE.
    • If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3-amp fused jumper between the signal circuit terminal C and ground. Verify the scan tool ext. trunk/liftglass rel. sw. parameter is ACTIVE.
    • If not the specified value, test the signal circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the rear compartment lid latch.
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