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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Power Door Lock Key Cylinder Switches Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the driver door lock switch.
  2. Ignition OFF, scan tool OFF, test for less than 10.0 ohms of resistance between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool door key cyl. unlock switch parameter is IDLE.
    • If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the DDM.
  4. Install a 3-A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool door key cyl. unlock switch parameter is UNLOCK.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDM.
  5. If the circuits test normal, test or replace the driver door lock switch.
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