Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Buick >> 2013 >> LaCrosse Premium, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 136 (Cellular Systems, Entertainment Systems & Navigation Systems) >> Diagnostic Information and Procedures >> Video Entertainment System Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate DVD display.
  2. Ignition OFF for two minutes, test for less than 5 Ω between the ground circuit terminals listed below and ground.
    • Ground terminal 8
    • Ground terminal 14
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify that 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.
  4. Ignition ON, connect a test lamp between the control circuit terminal 2 and the B + circuit terminal 1.
  5. Command the dual display enable ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the radio.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the radio.
  6. DVD playing, test for 1-6 V between the video bright control circuit terminal 16, and ground.
    • If greater than specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • If less than specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  7. DVD playing, command the video mode to normal, test for 1-2 V between the video mode signal circuit terminal 15, and ground.
    • If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  8. DVD playing, test for 1-3 V between the control circuit terminals listed below and ground.
    • Video Signal (+)- terminal 9
    • Video Signal (-) - terminal 10
    • If greater then specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • If less then specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  9. If all circuits test normal, replace the DVD display.
scientia non olet · About Mike's Workshop Manuals