Description
Bosch Control Unit for Parking Assist on Peugeot 407.
Used Bosch PDC (Park Distance Control) control unit designed for Peugeot 407 vehicles equipped with factory parking assistance. This compact electronic module manages ultrasonic sensors, interprets distance signals and provides audible/visual warnings to the driver. Supplied with original reference numbers 9656174280 / 9659350680 and Bosch internals (0263004095), the unit is an economical choice for mechanics and experienced DIYers who need a direct-fit replacement for a faulty parking assist ECU.
Compatibility And Application
Fits Peugeot 407 models equipped with Bosch Parking Assist systems (factory rear/complete PDC wiring). Commonly used on sedan, SW (estate) and coupe body styles where the original part numbers match: 9656174280, 9659350680. Verify that the vehicle is fitted with a Bosch PDC system before installation.
Technical Information
- Manufacturer: Bosch
- Model: Peugeot 407
- Product Codes: 9656174280, 9659350680
- Additional Numbers: 0263004095, 6590L7, 6590T5
Function And Typical Fault Symptoms
The module processes signals from the ultrasonic sensors and controls the parking aid indicators and buzzer. Common failure symptoms include intermittent or complete loss of PDC warnings, constant beep or fault tone, error messages on the instrument cluster, or disabled parking assist lights. In many cases the sensors themselves report errors to the control unit which then records fault codes.
Installation Recommendations
- Always disconnect the battery before starting removal or installation to avoid electrical damage.
- Access the unit by removing the necessary trim in the rear luggage area (units are typically mounted near the rear bumper or inside the boot behind trim panels).
- Carefully unplug the multi-pin connector(s) and release any mounting clips or screws. Compare connector shapes and pin counts before connecting the replacement.
- After mechanical installation, reconnect the battery and clear fault codes with a diagnostic tool. Verify sensor signals and perform any required initialization or calibration using a compatible diagnostic interface (e.g., PSA/DiagBox or equivalent) to ensure full functionality.
- Use dielectric grease on connectors if corrosion or moisture was present on the original unit to improve long-term reliability.
Why This Part Fails Most Often
- Water Ingress And Corrosion: Moisture penetration into connectors or the housing leads to short circuits and electronic failures.
- Impact Damage: Rear-end impacts or heavy shocks can physically damage sensors or the ECU mounting, causing failure.
- Electrical Surges And Faulty Wiring: Short circuits, poor ground connections or damaged sensor wiring can overload the unit.
- Sensor Failures: Defective ultrasonic sensors can create error conditions that render the control unit inoperative or put it into fail-safe mode.
- Age And Environmental Stress: Thermal cycling and vibration over years of service degrade solder joints and electronic components.
Practical Notes For Mechanics And DIYers
This used Bosch parking assist ECU is a cost-effective replacement for units with confirmed electronic faults. While mechanical replacement is straightforward for a trained mechanic, final commissioning often requires a diagnostic tool to clear stored fault codes and confirm sensor operation. If multiple sensors show errors, inspect wiring and connector continuity before replacing the control unit to avoid unnecessary repeat replacements.
