Circuit/System Testing

WARNING: This page is about a different car, the 2018 Buick Envision. 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 X1 harness connector at the K73 Telematics Communication Interface Control Module. It may take up to 2 minutes for all vehicle systems to power down.
Test for greater than 12.3 V between the B+ circuit terminal 14 and the low reference circuit terminal 13.
- If 12.3 V or less
1. Disconnect the C3 Telematics Communication Interface Control Module Battery.
2. Test for infinite resistance between the circuits listed below and ground.
  - B+ circuit terminal 14
  - Low reference circuit terminal 13.
    - If less than infinite resistance, repair the short to ground in the circuit.
    - Go to next step: If infinite resistance.
3. Test for less than 2 Ω in the circuits end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the C3 Telematics Communication Interface Control Module Battery.
- Go to next step: If greater than 12.3 V
Replace the K73 Telematics Communication Interface Control Module.