Description
Control Unit For Parking Assistant For Citroën And Peugeot Vehicles
This parking aid control unit is a direct-fit electronic module designed for Citroën and Peugeot models. Ideal for professional workshops and DIY mechanics, the unit is commonly referenced by OE numbers 9629825280 and 659078 (also shown as 601.746 NFP). It manages the ultrasonic sensors, buzzer and inboard signaling that help drivers detect obstacles while parking, restoring full parking assistance functionality when the original module fails.
Technical Information
- Manufacturer: Stellantis
- Model: Citroën C5; Citroën C8; Peugeot 807
- Product Codes: 9629825280, 659078
- Additional Numbers: 601.746 NFP
Function And Application
The control unit interprets signals from rear parking sensors and controls the audible and visual warnings on the vehicle’s dashboard or infotainment. It filters sensor inputs, detects obstacles, and outputs the appropriate beeps and distance information. This unit is intended for vehicles originally equipped with a parking assistance system and is compatible with the listed Citroën and Peugeot models when the OE numbers match.
Replacement And Installation
Replacement is typically straightforward for an experienced mechanic. General steps:
- Disconnect the vehicle battery before starting work.
- Access the control unit (commonly located in the boot/trunk area or behind interior trim panels near the rear bumper).
- Remove any retaining screws or clips and carefully unplug the wiring connectors.
- Fit the replacement unit, secure it, and reconnect all connectors.
- Reattach trims and reconnect the battery.
- Perform sensor calibration/initialization with a compatible diagnostic tool if required (see recommendations below).
Installation Recommendations
- Always disconnect the battery and wait briefly before unplugging electronics to reduce the risk of damage from voltage spikes.
- Inspect connectors and wiring for corrosion or damage before fitting the new unit; clean or repair as needed to avoid repeat failures.
- Use a PSA-compatible diagnostic tool to check fault codes and to carry out any necessary sensor calibration or initialization after installation.
- Secure the unit to its original mounting points to prevent vibration-related faults.
Most Common Failure Causes
- Moisture Ingress And Corrosion: Water penetration into connectors or the unit housing can cause intermittent faults or permanent damage.
- Impact Damage: Rear-end collisions that damage bumper sensors can overload or misalign the control unit’s inputs.
- Electrical Issues: Short circuits, poor grounding, or voltage spikes can damage internal electronics.
- Connector Wear: Broken pins or poor contact in multi-pin connectors lead to communication errors between sensors and the module.
Notes For Mechanics And DIYers
Searches for this part are often performed by OE numbers 9629825280 and 659078 — include these codes when sourcing replacements. While many units are a direct mechanical and electrical swap, calibration or initialization of the parking sensors via diagnostic equipment may be necessary to restore full functionality. Always follow manufacturer repair procedures and safety precautions when working with vehicle electronics.
