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Home >> GMC >> 2014 >> Terrain SLE, 4D Utility >> Repair and Diagnosis >> External Pages >> Different car >> Section 149 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Button Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Terrain and 2012 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the A10 inside rearview mirror.
  2. Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground:
    • Terminal 5 (UVC+UYS/UYX/-UVC/UYS/UYX)
    • Terminal 8 (UVC-UYS/UYX)
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for 500-900 Ω between the appropriate signal circuit terminal listed below and ground:
    • Terminal 3 (UVC+UYS/UYX/-UVC/UYS/UYX)
    • Terminal 11 (UVC-UYS/UYX)
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K73 telematics communication interface control module.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K73 telematics communication interface control module.
  4. Ignition ON, test for 8.5-10.5 V between the appropriate 10 V reference circuit terminal listed below and ground:
    • Terminal 4 (UVC+UYS/UYX/-UVC/UYS/UYX)
    • Terminal 12 (UVC-UYS/UYX)
    • If less than the specified range, test the 10 V reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K73 telematics communication interface control module.
    • If greater than the specified range, test the 10 V reference circuit for a short to voltage. If the circuit tests normal, replace the K73 telematics communication interface control module.
  5. Test for less than 1 V between the signal circuit terminal list below and ground.
    • Terminal 3 (UVC+UYS/UYX/-UVC/UYS/UYX)
    • Terminal 11 (UVC-UYS/UYX)
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K73 telematics communication interface control module.
  6. If all circuits test normal, test or replace the A10 rearview mirror.
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