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Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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 B1325, B1330, B1370, B1380, B1424, B1440, B1441, B1517, C0800, C0899, C12E1, P0560, P0562, P06E4, U0028, U0029, U0073 - U0078, U007A - U007D, U0100 - U02FF, U1814, U2098, or U2099 is not set.
    • Go to next step: If none of the DTCs are set 
  4. Refer to Circuit/System Testing.