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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 >> DTC B3265 >> 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 trunk relay from the rear fuse block.
  2. Ignition ON, verify that the rear compartment lid latch is deactivated.
    • If the rear compartment lid latch is still activated, repair the relay switch control circuit (56) for a short to voltage.
  3. Verify that a test lamp illuminates between the relay coil voltage supply circuit and ground.
    • If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance. If the voltage supply circuit fuse is open, test the relay switch control circuit (56) for a short to ground. If all circuit tests normal, test or replace the trunk relay.
  4. Verify that a test lamp illuminates between the relay switch voltage supply circuit and ground.
    • If the test lamp does not illuminate, repair the relay switch voltage supply circuit for a short to ground or an open/high resistance.
  5. Disconnect the harness connector of the rear compartment lid latch.
  6. Test for less than 1.0 ohm of resistance between the lid latch ground circuit and ground.
    • If greater than 1.0 ohm, test the ground circuit for an open/high resistance.
  7. Connect the harness connector of the rear compartment lid latch.
  8. Connect a 3-amp fused jumper wire between the relay switch voltage supply circuit and the relay switch control circuit. Verify the rear compartment lid latch is activated
    • If the rear compartment lid latch is not activated, test the relay switch control circuit for an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid latch.
  9. Connect a test lamp between the relay coil control circuit and the relay coil voltage supply circuit.
  10. Press the liftgate touch pad switch. The test lamp should momentarily turn ON each time the solenoid is commanded ON.
    • If the test lamp remains ON all the time, test for a short to ground on the relay coil control circuit. If the circuit tests normal, replace the BCM.
    • If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the relay coil control circuit. If the circuit tests normal, replace the BCM.
  11. If all circuits/connections test normal, replace the trunk relay.
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