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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 162 (Data Communications - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC U1100-U12FF >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON/Vehicle In Service Mode.
  2. Verify DTC U300D, P2534, P2535, U0073-U007E, or U100B is not set.
    • Go to next step: If none of the DTCs are set 
  3. Determine the device that is not communicating. Refer to Control Module U Code List .
  4. Refer to Data Link References to determine which data communication bus the non communicating device is on.
  5. Verify DTC U1100-U12FF is not set.
    • If the DTC is set and the non communicating device is on one of the CAN buses 

      Refer to Circuit/System Testing - Testing a CAN Device  .

    • If the DTC is set and the non communicating device is on one of the LIN buses 

      Refer to Circuit/System Testing - Testing a LIN Device  .

    • Go to next step: If the DTC is not set 
  6. A fault is currently not present and may be an intermittent condition.
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