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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.
  1. Determine the LIN device that is not communicating. Refer to Control Module U Code List .
  2. Ignition ON/Vehicle In Service Mode.
  3. Verify that DTC U0073-U007E or U0100-U02FF is not set.
    • Go to next step: If none of the DTCs are set 
  4. Refer to Circuit/System Testing.
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