LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2018 >> Enclave Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Audio Malfunction >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia Limited, 2017 Chevrolet Traverse, and 2017 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the radio.
  2. Disconnect the X2 harness connector at the vehicle communication interface control module.
  3. Ignition ON, test for less than 1 V between the vehicle communication interface control module cellular telephone voice signal circuit terminal 1 X2 and ground.
    • If not the specified value, test the cellular telephone voice signal circuit for a short to voltage.
  4. Test for less than 1 V between the vehicle communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and ground.
    • If not the specified value, test the cellular telephone voice low reference circuit for a short to voltage.
  5. Ignition OFF, test for infinite resistance between the vehicle communication interface control module cellular telephone voice signal circuit terminal 1 X2 and ground.
    • If not the specified value, test the cellular telephone voice signal circuit for a short to ground.
  6. Test for infinite resistance between the vehicle communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and ground.
    • If not the specified value, test the cellular telephone voice low reference circuit for a short to ground.
  7. Test for less than 2 Ω between the vehicle communication interface control module cellular telephone voice signal circuit terminal 1 X2 and the radio terminal 7 X2.
    • If not the specified value, test the cellular telephone voice signal circuit for a open/high resistance.
  8. Test for less than 2 Ω between the vehicle communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and the radio terminal 15 X2.
    • If not the specified value, test the cellular telephone voice low reference circuit for a open/high resistance.
  9. If all circuits test normal, replace the vehicle communication interface control module.
  10. If all circuits test normal, replace the radio.
scientia non olet · About LEMON Manuals