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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle OFF, disconnect the X1 harness connector at the radio.
  2. Disconnect the X2 harness connector at the K73 telematics communication interface control module.
  3. Vehicle in Service Mode, test for less than 1 V between the K73 telematics 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 K73 telematics 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. Vehicle OFF, test for infinite resistance between the K73 telematics 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 K73 telematics 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 K73 telematics communication interface control module cellular telephone voice signal circuit terminal 1 X2 and the radio terminal 20 X1.
    • 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 K73 telematics communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and the radio terminal 6 X1.
    • 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 K73 telematics communication interface control module.
  10. If all circuits test normal, replace the radio.
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