Circuit/System Testing
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF/vehicle OFF, and all vehicle systems OFF, disconnect the X2 harness connector at the K73 Telematics Communication Interface Control Module, ignition ON/vehicle in Service Mode.
- Test for less than 4 V between each of the signal circuits listed below and ground:
- Terminal 1
- Terminal 2
- If 4 V or greater
- Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11 Radio, ignition ON/vehicle in Service Mode.
- Test for less than 1 V between the signal circuits and ground.
- If greater than 1 V, repair the short to voltage on the circuit.
- If less then 1 V, replace the A11 Radio.
- If less than 4 V
- Ignition OFF/vehicle OFF.
- Test for infinite resistance between each of the signal circuits listed below and ground:
- Terminal 1
- Terminal 2
- If less than infinite resistance
Repair the short to ground on the circuit.
- If infinite resistance
- Disconnect the X1 harness connector at the A11 Radio.
- Test for less than 2 Ω in each of the signal circuits listed below end to end:
- K73 Telematics Communication Interface Control Module Terminal 1 X2
- K73 Telematics Communication Interface Control Module Terminal 2 X2
- If 2 Ω or greater
Repair the open/high resistance on the circuit.
- If less than 2 Ω
- Replace the K73 Telematics Communication Interface Control Module.
- Verify that the Connecting to OnStar® message is heard clearly through the audio system when the OnStar® blue button is pressed.
- If audio is not heard clearly
Replace the A11 Radio.
- If audio is heard clearly
- If audio is not heard clearly
- All OK.