Description
Parking Assist Control Unit for CITROËN and PEUGEOT vehicles
This parking assist control unit is designed for Citroën and Peugeot models and is commonly searched by part numbers 9629825380, 659078 and related references. It manages input from ultrasonic proximity sensors and provides audible and/or visual guidance during low-speed maneuvers, helping drivers detect obstacles when reversing or parking. Suitable for professional workshops and experienced DIY mechanics who service Stellantis group vehicles.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5; Citroën C8; Peugeot 807
- Product Codes: 9629825380; 659078
- Other Numbers: 601746; NFP
What It Does
The unit processes signals from parking ultrasonic sensors and the vehicle CAN network to determine obstacle distance and trigger acoustic chimes or dashboard indications. It coordinates sensor activation when the vehicle is in reverse or at low speeds and may communicate with the instrument cluster and gearbox electronics to present warnings or inhibit certain actions.
Common Symptoms
- No parking beeps or visual guidance when reversing.
- Constant or intermittent parking sensor warnings on the dash.
- Individual sensors reporting errors or inconsistent distance readings.
- Error codes related to parking sensors or control unit communication stored in the fault memory.
Replacement Procedure
Basic replacement steps for a competent mechanic or skilled DIYer:
- Disconnect the vehicle battery before starting to avoid short circuits and protect electronics.
- Remove interior trim panels or the bumper trim to access the control unit location (location varies by model).
- Unplug electrical connectors carefully, inspect pins and seals for corrosion or damage.
- Unbolt the unit and install the replacement, securing to the correct torque points.
- Reconnect connectors and the battery, then verify operation of all parking sensors and listen for expected acoustic signals.
When installing an identical part number, the unit is often plug-and-play. If the replacement has a different part number or the vehicle reports communication errors, initialization or coding with a PSA-compatible diagnostic tool (DiagBox/Lexia/PP2000) may be required.
Installation Recommendations
- Always disconnect the battery before removing the control unit.
- Inspect and clean sensor connectors and wiring harnesses; repair any damaged cabling before fitting the new unit.
- Protect the unit from moisture during installation; ensure seals and grommets are intact.
- Use proper diagnostic equipment to clear fault codes and confirm sensor readings after replacement.
- Follow manufacturer access procedures and torque specifications to avoid damage.
Why This Part Commonly Fails
Typical causes of failure include moisture ingress and corrosion of connectors, impact damage to sensors or wiring (rear-end collisions or bumper impacts), and thermal stress or aging of electronic components. Faulty wiring or poor repairs elsewhere on the vehicle can also lead to intermittent faults or permanent control unit failure.
Notes for Buyers
Customers frequently search by part number—include 9629825380 or 659078 when looking for compatibility. Check part numbers against the vehicle’s original reference to increase the chance of direct fitment. Testing the sensors and harness before replacing the control unit can prevent unnecessary swapping of parts.
