Description
Heating And Air Conditioning Control Unit BEHR For PEUGEOT 307 II
Hardware 4.3, 4.4 And 4.5
Software 5.0
This BEHR heating and air conditioning control unit is a direct-fit electronic controller designed for Peugeot 307 II models. Ideal for professional garages and experienced DIY mechanics, the unit manages user inputs for cabin climate, blower speed, vent selection and communicates with the vehicle’s HVAC actuators and air conditioning system. Commonly searched by part numbers (9646627977, 6451ZP, 6451ZN, 6451SN, 98001291XT), this module restores full manual climate functionality when the original control panel has failed or become intermittent.
Features include intuitive knob/button inputs, control outputs for blower motor stages, recirculation and AC clutch request, and interfaces to blend/actuator positions. The unit supports Hardware versions 4.3, 4.4 and 4.5 with Software version 5.0, ensuring compatibility with the ECU and actuator protocols used on many Peugeot 307 II vehicles.
Technical Information
- Manufacturer: BEHR
- Model: Heating And Air Conditioning Control Unit For Peugeot 307 II
- Product Codes: 9646627977, 6451ZP, 6451ZN, 6451SN
- Other Numbers: 98001291XT
- Hardware: 4.3 / 4.4 / 4.5
- Software: 5.0
Installation Recommendations
- Always disconnect the battery before starting removal to avoid short circuits or damage to vehicle electronics.
- Remove surrounding trim panels and the central fascia to access the control unit. Keep all screws and fasteners organized.
- Carefully unplug electrical connectors by releasing the locking tabs—do not pull on wiring.
- When installing the replacement unit, ensure connectors seat fully and secure the unit to prevent vibration-related faults.
- After installation, cycle the ignition and test all functions: blower speeds, AC engagement, recirculation, temperature control and vent selection. Verify actuator movement (blend/direction) for full system operation.
- Use calibrated diagnostic equipment if actuators or HVAC fault codes remain—some faults require clearing via diagnostic tools.
Why The Part Most Often Fails
- Age-Related Wear: Potentiometers, switches and internal connectors degrade over many years of use, causing intermittent or lost control inputs.
- Thermal Stress: Heat cycles in the dashboard area can cause solder joint cracks or component failure on the PCB.
- Moisture And Contamination: Water ingress or humid conditions lead to corrosion on connectors and contacts.
- Mechanical Damage: Excessive force when operating controls or during dashboard removal can damage the assembly.
- Electrical Surges: Faulty alternator or jump-start events can damage internal electronics.
Typical Symptoms Of A Faulty Unit
- No response from control knobs or buttons.
- Blower fan stuck on one speed or not working at all.
- Inability To Change Temperature Or Airflow Direction.
- Intermittent AC engagement or failure to request compressor operation.
- Error codes related to HVAC control or actuator communication stored in vehicle diagnostics.
Searching By Part Number: Many professionals and DIY customers locate this module by its OEM and supplier numbers (9646627977, 6451ZP, 6451ZN, 6451SN, 98001291XT). Confirm hardware/software version compatibility listed above when matching parts for Peugeot 307 II vehicles.
Notes For Professionals
This unit is intended for installation by trained technicians or experienced enthusiasts comfortable with dashboard disassembly and basic electrical diagnostics. If actuator alignment or persistent fault codes occur after replacement, use a suitable diagnostic tool to inspect HVAC actuators and clear stored faults.
