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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 >> Hatch Release Inoperative >> Circuit/System Testing

Circuit/System Testing

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Liftgate Release Switch Circuit Test

  1. Disconnect the BCM connector C6.
  2. Connect a test lamp from battery voltage to the liftgate release switch circuit terminal in the harness connector.
  3. Verify the test lamp is not illuminated while the release switch is inactive.
    • If the test lamp remains illuminated, the signal circuit is shorted to ground or the switch contacts are shorted closed.
  4. Verify the test lamp is illuminated, while the release switch is active.
    • If the test lamp does not illuminate, an open is present in the signal circuit, switch or ground.
  5. If the release switch circuits test normal, replace the BCM.

Liftgate Release Output Circuit Test

  1. Remove the liftgate 15A fuse in the underhood fuse block and connect a fused jumper wire to actuator output fuse terminal in the fuse block.
  2. Verify that the liftgate latch actuator activates when the other end of the jumper wire is momentarily touched to battery voltage.
    • If the actuator does not activate, test the control and ground circuits for an open or short to ground. If the circuits test normal, replace the liftgate latch actuator.
  3. Disconnect the underhood fuse block connector C5.
  4. Connect a test lamp from the endgate latch relay supply voltage circuit terminal to the endgate latch relay coil control circuit terminal in the harness connector.
  5. Ignition ON, verify that the test lamp illuminates when the liftgate latch release function is activated.
    • If the test lamp does not illuminate, test the relay supply voltage and relay coil control circuits for an open or short to ground. If the circuits test normal, replace the BCM.
  6. If the liftgate release output circuits test normal, replace the underhood fuse block.
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