Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the connector at the Q46 Air Conditioning Compressor Solenoid Valve. Connect a test light between terminals 1 and 2 of the connector. Ignition ON.
Verify the test light turns on and off when commanding the Q46 Air Conditioning Compressor Solenoid Valve ON and OFF with the scan tool.
- If the test light does not turn ON and OFF
1. Ignition OFF, disconnect the X5 connector at the K9 Body Control Module, ignition ON.
2. Test the circuits listed below for a short to voltage:
  - Circuit 7573
  - Circuit 7574
  - If a short to voltage is found, repair the fault on the circuit.
  - Go to next step: If a short to voltage is not found
3. Ignition OFF.
4. Test the circuits listed below for a short to ground:
  - Circuit 7573
  - Circuit 7574
  - 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
5. Test the circuits listed below for an open/high resistance:
  - Circuit 7573
  - Circuit 7574
  - 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
    Go to next step: Replace the K9 Body Control Module
- Go to next step: If the test light turns ON and OFF
Test the Q46 Air Conditioning Compressor Solenoid Valve or replace the G1 Air Conditioning Compressor.