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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 B3849 >> 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 inoperative exterior door handle switch assembly.
  2. Ignition OFF, scan tool OFF, test for less than 10.0 ohms of resistance between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition OFF, scan tool OFF, test for less than 10.0 ohms of resistance between the ground circuit terminal F and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify the scan tool door handle switch parameter displays INACTIVE.
    • If not the specified value, test the appropriate signal circuit terminal E for a short to ground. If the circuit tests normal, replace the appropriate door control module.
  5. Verify the appropriate scan tool ext. door handle switch parameter located in the RCDLR inputs list displays INACTIVE.
    • If not the specified value, test the appropriate signal circuit for a short to ground. If the circuit tests normal, replace the RCDLR.
  6. Install a 3-A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool door handle switch parameter displays ACTIVE.
    • If not the specified value, test the signal circuit terminal E for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate door control module.
  7. Verify the appropriate scan tool ext. door handle switch parameter located in the RCDLR inputs list displays ACTIVE.
    • If not the specified value, test the appropriate signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the RCDLR.
  8. If all circuits test normal, test or replace the appropriate exterior door handle switch assembly.
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