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B1055–REAR BLEND DOOR CONTROL CIRCUIT OPEN (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 (C54) REAR BLEND DOOR DRIVER CIRCUIT OPEN (C154) REAR COMMON DOOR DRIVER CIRCUIT OPEN REAR BLEND DOOR ACTUATOR A/C HEATER CONTROL Theory of Operation The A/C Heater Control drives the Rear Blend Door Actuator via the (C54) Rear Blend Door Driver circuit and the NOTE: DTC B1055 must be active for the results of this test to be valid. Do not perform this test if DTC Diagnostic Test 1. CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE DTCs Turn the ignition on. With the scan tool, read active HVAC DTCs. Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE DTCs? Yes >> Diagnose and repair the DTC(s). If present, diagnose and repair all Rear Blend and Rear Mode Door Control Circuit/Performance DTCs first, then all other Control Circuit/Performance DTCs next. Refer to No >> Go To 2 HB HVAC - ELECTRICAL DIAGNOSTICS 24 - 241 |