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Home >> Hummer >> 2010 >> H3 Alpha >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 1284 (Object Detection System) >> Diagnostic Information and Procedures >> Parking Assist System Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Park Assist Disable Switch Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector I/P multifunction switch.
  2. Test for less than 10 ohms between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Park Assist Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the object alarm module.
  4. Install a 3A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool Park Assist Switch parameter is Active.
    • 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 object alarm module.
  5. If all circuits test normal, test or replace the I/P multifunction switch.

Park Assist Disable LED Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector I/P multifunction switch.
  2. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 6 and ground:
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the harness connector at the I/P multifunction switch assembly. Disconnect the X2 harness connector at the object alarm module.
  4. Ignition ON, verify the park assist disable LED is not illuminate.
    • If the LED is illuminated, test the control circuit for a short to ground. If the circuit tests normal, test or replace the I/P multifunction switch.
  5. Install a 10A fused jumper wire between the control circuit terminal 3 and ground. Verify the park assist disable LED is illuminated.
    • If the LED is not illuminated, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the I/P multifunction switch.
  6. If all circuits test normal, replace the object alarm module.
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