Circuit/System Verification

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 ON/Vehicle In Service Mode.
Verify that DTC U0073 - U007E is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If none of the DTCs are set
Verify DTC U0198 or B1A1F is not set.
- If any of the DTCs are set
  Refer to DTC U0100-U02FF (Using Digital Multimeter) , or DTC U0100-U02FF (Using Network Communication Status) , or DTC B1A1F to diagnose the K73 Telematic Control Module or Ethernet bus 4.
- Go to next step: If none of the DTCs are set
Verify DTC U0184 or B1A1B is not set.
- If any of the DTCs are set
  Refer to DTC U0100-U02FF (Using Digital Multimeter) , or DTC U0100-U02FF (Using Network Communication Status) , or DTC B1A1B (K56 Serial Data Gateway Module) , or DTC B1A1B (A11 Radio) to diagnose the A11 Radio or Ethernet bus 2.
- Go to next step: If none of the DTCs are set
Verify DTC U0146, U1607, U1608, U1609, U160A, U1977, U1978, U197B, U197C, U197D, or B1A1D is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle to diagnose the K56 Serial Data Gateway Module or Ethernet bus 3.
- Go to next step: If none of the DTCs are set
Verify DTC U0163 or U1626 is not set.
- If any of the DTCs are set
  Refer to DTC U0100-U02FF (Using Digital Multimeter) , or DTC U0100-U02FF (Using Network Communication Status) , or DTC U1626 to diagnose the K179 Automated Driving Mapping Module or Ethernet bus 11.
- Go to next step: If none of the DTCs are set
Verify DTC U1624 is not set.
- If the DTC is set
  Replace the control module setting the DTC.
- Go to next step: If the DTC is not set
A fault is currently not present and may be an intermittent condition.