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Home >> Cadillac >> 2016 >> CTS V >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U1804: Lost Communication with Inside Rearview Mirror Control Module >> Circuit/System Verification

Circuit/System Verification

  1. Verify that DTC U0073, U0078, B1325, B1330, B1370, B1380, B1424, B1440, B1441, B1517, C0800, C0899, C12E1, P0560 or P0562 is not set.
  2. Verify that DTC U1804 is not set.
    • If the DTC is set 

      Refer to Circuit/System Testing.

    • If the DTC is not set 
  3. All OK.