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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 162 (Data Communications - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC U1500-U15FF >> Circuit/System Verification

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.
NOTE:

For vehicles not equipped with K29F Front Seat Heater Control Module, K29FV Front Seat Heater Vent Control Module, K29R Rear Seat Heater Control Module, or K32 Heated Steering Wheel Module:

  • Ignore DTC U152F if equipped with RPO 00R or 00V
  • Ignore DTC U1530 if equipped with RPO 00G
  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, U0100-U02FF, U0600-U06FF, U1100-U12FF, U1600-U17FF, or U2200-U23FF is not set.
    • Go to next step: If none of the DTCs are set 
  4. Refer to Circuit/System Testing.
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