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Home >> Chevrolet >> 2012 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Cellular Systems, Entertainment Systems & Navigation Systems) >> Diagnostic Information and Procedures >> DTC B128D >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the Radio/HVAC display.
  2. Reconnect the Radio/HVAC Control, if disconnected.
  3. Test for less than less than 20 Ω between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Test for OK Ω - 13.5kΩ between the display position circuit terminal 5 and ground.
    • If less than the specified range, test the circuit for a short to ground. If the circuit tests normal, replace the radio.
    • If greater than the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the radio.
  5. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  6. Verify a test lamp illuminates between the remote enable circuit terminal 3 and ground.
    • If the test lamp does not illuminate, test the enable circuit for an open/high resistance.
  7. Test for less than 1 V between the display position signal circuit terminal 5 and ground.
    • if greater than the specified range, test the position signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  8. Connect a DMM between the display control circuit terminal 4 and ground. Press and release the NAV button on the Radio/HVAC Control. Verify the voltage changes each time the display button is pressed. The value should change between less than 1 V to greater than 4 V.
    • If the value is always less than 1 V, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
    • If the value is always greater than 1 V, test the control circuit for a short to voltage. If the circuit tests normal replace the radio.
  9. If all circuits test normal, replace the Radio/HVAC display actuator.
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