Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard TransFACTORY OEM SERVICE PROCEDURE
HVAC System Auto A/C (Diagnostics)
- Basic Diagnostic Procedure
- General Description
- Electrical Component Location
- Auto A/C Control Module I/O Signal
- Diagnostic Chart for Self-Diagnosis
- Diagnostics with Phenomenon
- Inspection
- Diagnostic Procedure With Phenomenon
- Nothing Is Displayed On The Screen. No Illumination Appears On The Indicator
- Air Conditioner Does Not Stop When Pressing The Off Switch
- Windshield Grass Does Not Clear When Pressing The Def Switch
- Cold Air Not Emitted
- Warm Air Not Emitted
- Compartment Temperature Is Lower Than Setting Temperature
- Compartment Temperature Is Higher Than Setting Temperature
- Air Does Not Come Out. Airflow Is Low
- Air Cannot Be Controlled
- Cool Air Does Not Come Out When Pressing The A/C Switch. Fog Cannot Be Cleared. (Compressor Does Not Operate.)
- Unable To Switch Suction Vents
- Unable To Switch Vents
- Illumination Does Not Illuminate Or Cannot Be Dimmed
- Subaru Select Monitor
- Read Diagnostic Trouble Code (DTC)
- Clear Memory Mode
- Read Current Data
- Diagnostic Procedure for Subaru Select Monitor Communication
- List of Diagnostic Trouble Code (DTC)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC B1430: Room Temperature Sensor Circuit Wire Break
- DTC B1431: Room Temperature Sensor Circuit Short-Circuit
- DTC B1432: Outside Air Sensor Circuit Wire Break (Air-Conditioning)
- DTC B1433: Outside Air Sensor Circuit Short-Circuit (Air-Conditioning)
- DTC B1434: Ambient Temperature Sensor Circuit Wire Break
- DTC B1435: Evaporator Sensor Circuit Short-Circuit
- DTC B14A1: SUNLOAD Sensor Circuit Open
- DTC B14A2: SUNLOAD Sensor Circuit Short
- DTC B14E1: Air Mix Door Actuator Stepping Motor Circuit Wire Break (Driver's Seat)
- DTC B14E2: Air Mix Door Actuator Stepping Motor Circuit Short-Circuit (Driver's Seat)
- DTC B14E3: Air Mix Door Actuator Stepping Motor Circuit Wire Break (Passenger's Seat)
- DTC B14E4: Air Mix Door Actuator Stepping Motor Circuit Short-Circuit (Passenger's Seat)
- DTC B14E5: Mode Door Actuator Stepping Motor Circuit Wire Break
- DTC B14E6: Mode Door Actuator Stepping Motor Circuit Short-Circuit
- DTC B14E9: Intake Door Actuator Potentiometer Circuit Wire Break
- DTC B14EA: Intake Door Actuator Potentiometer Circuit Short-Circuit
- DTC B14EB: Intake Door Actuator Lock
- DTC U0073: Control Module Communication Bus "A" Off
- DTC U0100: Lost Communication With ECM/Pcm "A"
- DTC U0101: Lost Communication With TCM
- DTC U0122: Lost Communication With Vehicle Dynamics Control Module
- DTC U0140: Lost Communication With Body Control Module
- DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module
- DTC U0401: Invalid Data Received From ECM/Pcm "A"
- DTC U0402: Invalid Data Received From TCM
- DTC U0416: Invalid Data Received From Vehicle Dynamics Control Module
- DTC U0422: Invalid Data Received From Body Control Module
- DTC U0423: Invalid Data Received From Instrument Panel Cluster Control Module
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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