Description
Control unit for parking assist for Citroën and Peugeot vehicles
This parking assist ECU is a direct-fit electronic control unit designed for selected Citroën and Peugeot models. It manages ultrasonic sensors and the parking aid logic to provide audible and/or visual warnings during low-speed maneuvers. The unit is commonly searched by part numbers (9650400280, 659078, 601881) and is aimed at professional mechanics and experienced DIYers who service alarm, sensor and parking systems.
Key Features
– Manages ultrasonic parking sensors and interprets distance information
– Delivers audible beeps and/or outputs data to vehicle displays while parking
– Direct replacement for vehicles listed below when matching product codes
Compatibility
Typical models where this unit is fitted include:
- Citroën C5
- Citroën C8
- Peugeot 807
How Replacement Is Performed
General replacement steps (typical procedure – follow vehicle manufacturer instructions):
- Disconnect the negative battery terminal before any work on the electrical system.
- Access the control unit by removing the relevant interior trim or luggage compartment panels.
- Unplug the multi-pin connector(s) and remove any securing clips or brackets.
- Fit the replacement unit, secure it mechanically and reconnect the connector(s).
- Reconnect the battery and verify operation of parking sensors and indicators.
- Run a diagnostic check and, if required, perform any adaptations or calibration with an appropriate diagnostic tool.
Common Failure Causes
Parking assist control units tend to fail for reasons such as:
- Moisture ingress or corrosion at connectors leading to intermittent faults.
- Impact or water damage to sensors that stress the control electronics.
- Wiring harness damage or poor ground connections causing communication errors.
- Electrical surges or short circuits from other vehicle faults.
Installation Recommendations
- Always isolate the battery before removal/installation to avoid damage to the unit.
- Inspect and clean connectors and wiring harness; replace corroded terminals.
- Ensure the unit is mounted in the original orientation and securely fastened to avoid water pooling or vibration damage.
- After installation, verify each sensor individually and perform any required adaptation/calibration with a suitable diagnostic interface to ensure full functionality.
- Use ESD precautions when handling electronic modules to avoid static damage.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5; Citroën C8; Peugeot 807
- Product Codes: 9650400280; 659078; 601881
- Additional Numbers: 601881 NFP
Notes: Verify matching product codes when replacing the control unit. After fitting, sensor operation should be checked at low speed and any error codes cleared and rechecked with diagnostic equipment to confirm proper function.
