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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> DTC B153A >> Circuit/System Testing

Circuit/System Testing

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Liftgate Latch Switch Circuit Test

  1. Disconnect the liftgate latch connector.
  2. Ignition ON, verify that the Pawl Sw., Ratchet Sw., and Sector Sw. parameters are Inactive.
    • If any of the switch parameters are displayed as Active, test the affected switch signal circuit for a short to ground. If the signal circuit tests normal, replace the liftgate control module.
  3. Using a DMM, verify that battery voltage is present at each of the switch signal circuit terminals in the latch harness connector.
    • If battery voltage is not present on any of the switch signal circuits, test the affected signal circuit for an open. If the circuit tests normal, replace the liftgate control module.
  4. Using a DMM, verify that continuity to ground is present at the low reference circuit terminal in the latch harness connector.
    • If the low reference circuit has high resistance to or no continuity to ground, test the low reference circuit for an open or high resistance. If the circuit tests normal, replace the liftgate control module.
  5. If all the circuits test normal, replace the liftgate latch assembly.

Full Open Switch Circuit Test

  1. Ignition ON, open the liftgate to the full open position and verify that the Full Open switch parameter is Active.
    • If the switch parameter is displayed as Inactive, test the full open switch signal circuit for an open/high resistance. If the circuit tests normal, replace the liftgate control module.
  2. Disconnect the full open switch connector and verify that the Full Open switch parameter is Inactive.
    • If the switch parameter is displayed as Active, test the full open switch signal circuit for a short to ground. If the circuit tests normal, replace the liftgate control module.
  3. If the circuits test normal, replace the full open switch.
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