C 1500 Yukon 2WD V8-4.8L VIN V (2000)
3. This step tests the operation of the microphone. The operator may say that this call is a "voice call with no data". This does not mean that the
microphone is operating properly.
4. This step tests the microphone circuit from the microphone to the vehicle interface unit (VIU).
5. This step tests the microphone circuit between the VIU and the vehicle communication unit) VCU.
Unable To Contact Call Center - OnStar
Diagnostic Chart
TEST DESCRIPTION
This procedure diagnoses the "Unable to Contact OnStar" prompt from the OnStar(R) system.
2. This step verifies that the call to the OnStar(R) Center will not go through.
3. This step tests for a short to power in the XCVR DIG return circuit.
4. This step ensures that the OnStar® system is configured properly.
Will Not Power Up - OnStar
