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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 192 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> Power Liftgate Malfunction >> Component Testing

Component Testing

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Liftgate Object Sensor

  1. Ignition OFF, disconnect the harness connector at the right liftgate tape switch.
  2. Test for 10K ohms between the signal terminal A and the low reference terminal B.
    • If not within the specified range, replace the right liftgate tape switch.
  3. Disconnect the harness connector at the left liftgate tape switch.
  4. Test for 10K ohms between the signal terminal A and the low reference terminal B.
    • If resistance is not within the specified range, replace the left liftgate tape switch.

Liftgate Interior/Exterior Switch

  1. Ignition OFF, disconnect the harness connector at the appropriate liftgate switch.
  2. Test for infinite resistance between the signal terminal 1 and the low reference terminal 2 with the switch in the open position.
    • If not the specified value, replace the liftgate switch.
  3. Test for less than 2 ohms between the signal terminal 1 and the low reference terminal 2 with the switch in the closed position.
    • If greater than the specified range, replace the liftgate switch.

Liftgate Latch Assembly

  1. Install a 20-amp fused jumper wire between the control terminal 1 and 12 volts. Momentarily install a jumper wire between the control terminal 3 and ground. The liftgate latch assembly should perform the CINCH or RELEASE function.
    • If the function does not perform as specified, replace the liftgate latch assembly.
  2. Reverse the jumper wires, the liftgate latch assembly should perform the RELEASE or CINCH function.
    • If the function does not perform as specified, replace the liftgate latch assembly.

I/P Switch Assembly

  1. Ignition OFF, disconnect the harness connector at the I/P switch assembly.
  2. Test for infinite resistance between the signal terminal 7 and the ground terminal 3 with the liftgate open switch in the inactive position.
    • If not the specified value, replace the I/P switch assembly.
  3. Test for infinite resistance between the signal terminal 8 and the ground terminal 3 with the liftgate disable switch in the inactive position.
    • If not the specified value, replace the I/P switch assembly.
  4. Test for less than 3 ohms between the signal terminal 7 and the ground terminal 3 with the liftgate open switch in the active position.
    • If greater than the specified range, replace the I/P switch assembly.
  5. Test for less than 3 ohms between the signal terminal 8 and the ground terminal 3 with the switch in the disable position.
    • If greater than the specified range, replace the I/P switch assembly.
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