CUSTOMER CONCERN The instrument cluster, radio, and HVAC controls are inoperative, the scan tool cannot communicate with those modules, and DTCs U0155 and U0422 are stored. CAUSE The medium-speed CAN wiring leading to the HVAC module was damaged, interrupting communication with the affected modules. CORRECTION Repair the damaged medium-speed CAN circuits to the HVAC module, clear DTCs U0155 and U0422, and verify cluster, radio, HVAC, and scan-tool communication operation.