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U0019–CAN B BUS (ATC) (CONTINUED) For the Automatic Temperature Control (ATC) circuit diagram (Refer to 24 - HEATING & AIR CONDITIONING - For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes ACTIVE U0019 CAN B BUS DTC IN FRONT CONTROL MODULE (D55) CAN B BUS (+) CIRCUIT OPEN (D54) CAN B BUS (-) CIRCUIT OPEN A/C HEATER CONTROL Diagnostic Test 1. VERIFY DTC U0019–CAN B BUS IS ACTIVE Turn the ignition on. With the scan tool, read HVAC DTCs. Does the scan tool display active: U0019–CAN B BUS? Yes >> Go To 2 No >> If the DTC is stored, check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, Perform BODY VERIFICATION TEST – VER 1. 2. CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM) With the scan tool, read Front Control Module (FCM) DTCs Does the scan tool display any active CAN B BUS related DTCs? Yes >> Diagnose and repair the DTC(s). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) No >> Go To 3 HB HVAC - ELECTRICAL DIAGNOSTICS 24 - 301 |