Circuit/System Testing

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the X1 connector at the A103 Roof Console. It may take up to 2 min for all vehicle systems to power down.
Test ground circuit terminal 12 for an open/high resistance.
- If an open/high resistance is found, repair the fault on the circuit.
- Go to next step: If an open/high resistance is not found.
Disconnect the X2 connector at the A103 Roof Console. Ignition ON
Test the following control circuits for greater than 8.5 V
- Terminal 3 and ground
- Terminal 4 and ground.
- If less than 8.5 V on both circuits
1. Ignition OFF, test the following circuits for a short to ground.
  - Circuit 2516
  - Circuit 2517
  - If a short to ground is found, repair the fault on the circuit.
  - Go to next step: If a short to ground is not found.
2. Test the following circuits for an open/high resistance.
  - Circuit 2516
  - Circuit 2517
  - If an open/high resistance is found, repair the fault on the circuit.
  - Go to next step: If an open/high resistance is not found.
3. Replace the K73 Telematic Control Module.
- Go to next step: If greater than 8.5 V on either circuit.
Replace the A103 Roof Console.