High-quality Parking Assist ECU suitable for a range of Stellantis vehicles, commonly sought under OE numbers such as 9661496880 and related codes. Designed to manage ultrasonic sensors and provide reliable parking aid functions, this control unit is aimed at professional workshops and DIY mechanics who service Citroën and Peugeot models. Clear product codes in the listing make it easy to find the correct replacement; technicians appreciate direct cross-references for fast diagnosis and repair.

Function And Fitment

The unit controls the parking sensor system (ultrasonic sensors), interpreting distance data and triggering audible/visual warnings in the cabin. It integrates with the vehicle’s CAN network and may interact with other convenience systems (e.g., reverse light signal, dashboard indicators). Typical fitment includes several Citroën and Peugeot models from around 2005 onwards — frequently used applications are Citroën C8, Peugeot 307, and Peugeot 807, but fitment can extend to other Stellantis platforms that share parking assist architecture.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Parking Assist Control Unit (ECU) — Applicable Models: Citroën C8, Peugeot 307, Peugeot 807 (and other compatible models from 2005+)
• Product Codes: 9661496880, 601.990
• Other Numbers: 6590N2, 6590V4, 659078, 6590K9, 6590L0, NFP

Installation Recommendations

Before starting work, always disconnect the vehicle battery to avoid short circuits and damage to electronic modules. Typical replacement steps:

1. Locate the parking ECU (location varies by model — commonly behind the rear bumper, in luggage compartment side panels, or under trim panels).
2. Remove trim or bumper fasteners to gain access to the unit.
3. Unplug electrical connectors and note locking tabs; inspect connector pins for corrosion or damage.
4. Unbolt and remove the old unit, then install the replacement and secure fasteners.
5. Reconnect connectors and the battery, then perform a system check. The parking system may require sensor initialization or calibration and a full diagnostic check to clear any stored faults.

When in doubt about initialization or adaptation procedures, use an appropriate diagnostic tool capable of working with PSA systems to confirm proper operation and clear fault codes.

Most Common Failure Reasons

• Moisture Ingress And Corrosion: Exposure to water and road salts can corrode connectors or internal circuits, causing intermittent or permanent failure.
• Impact Damage: Rear collisions or strong impacts to the bumper can damage sensors or the control unit mounting and wiring.
• Electrical Surges Or Faulty Wiring: Short circuits, poor grounds or damaged wiring harnesses can lead to ECU malfunction.
• Age-Related Wear: Internal components and solder joints can degrade over many years, especially in vehicles often driven in harsh conditions.

Notes For Mechanics And DIYers

This control unit is commonly searched by its OE/reference numbers — include these in your parts search to speed up sourcing. After replacement, check all ultrasonic sensors for correct operation and no physical damage. Inspect connector seals and wiring looms for corrosion or mechanical wear to prevent repeat failures. For reliable long-term repair, clean and protect connectors and ensure secure mounting away from moisture paths.

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.

This parking assist ECU is a direct-fit electronic control unit designed for Citroën and Peugeot models. Ideal for professional workshops and DIY mechanics, this unit (part numbers 9629825380, 659078, 601746, NFP) manages ultrasonic parking sensors and the associated warning logic to help drivers maneuver safely. Replacing a faulty parking assist ECU restores sensor processing, audible/visual alerts and CAN-bus communication related to parking aids.

Key Features And Benefits

High-value replacement for vehicles equipped with factory parking sensors. The unit interprets sensor signals, filters false triggers and issues accurate distance warnings to the driver. Compatible with original electrical connectors and mounting points to ensure secure installation and reliable operation. Commonly sought under reference numbers 9629825380 and 659078 — include these codes when searching for compatibility.

Fitment And Compatible Models

Typical applications include Citroën C5, Citroën C8 and Peugeot 807. Always verify the listed product codes against the part required for your specific vehicle generation and equipment level.

What The Unit Does

The parking assist control unit processes inputs from ultrasonic sensors, assesses obstacle distance, and sends output signals to dashboard indicators, audible buzzers, and, where fitted, visual displays. It communicates with the vehicle network (CAN) to coordinate with other driver-assistance systems and to store sensor diagnostics.

Typical Failure Modes And Causes

• Water Ingress Or Corrosion: Moisture entering connectors or the unit housing can cause intermittent faults or permanent failure.
• Physical Damage: Impact to sensors or wiring can create erroneous signals leading to ECU error states.
• Electrical Surges Or Short Circuits: Faulty wiring, after-market installations, or jump-start events may damage internal electronics.
• Connector Oxidation And Poor Contacts: Corroded pins result in communication errors between sensors and the ECU.

Replacement Procedure (General Guidance)

• Safety First: Disconnect the vehicle battery before starting to avoid short circuits and protect sensitive electronics.
• Locate Unit: Access the parking assist ECU following the vehicle manufacturer’s service manual — common locations include under the dashboard, in the trunk area, or behind trim panels.
• Disconnect Connectors: Carefully release locking tabs and remove electrical connectors. Inspect connectors and wiring for corrosion or damage.
• Remove Mounting Fasteners: Unbolt the unit and remove it from its bracket or housing.
• Install New Unit: Mount the replacement unit, reconnect all connectors securely and reassemble trim.
• Power-Up And Check: Reconnect the battery, clear stored fault codes, and perform a functional check of sensors and warnings.

Recommended Workshop Tips

• Perform A Full Sensor Check: Test each ultrasonic sensor for correct operation before condemning the ECU — a failed sensor can mimic ECU faults.
• Inspect Wiring Harness And Grounds: Repair any damaged wires or corroded grounds to prevent recurring failures.
• Fault Code Scan: Use a professional diagnostic tool to read parking assist fault codes and live sensor data during testing.
• Secure Mounting And Sealing: Ensure the unit and its connectors are properly sealed against moisture and vibration.

Technical Information

Manufacturer: Stellantis

Model: Citroën C5; Citroën C8; Peugeot 807

Product Codes: 9629825380; 659078; 601746; NFP

Other Numbers: 659078; 9629825380

Why This Part Is Frequently Replaced

Parking assist ECUs are commonly replaced when sensors report inconsistent distances, multiple sensor faults appear simultaneously, or the system ceases to provide acoustic/visual warnings. Environmental exposure (moisture, road salt), connector corrosion and prior impact damage are the most frequent root causes.

Installation Recommendation

For reliable commissioning and diagnosis use professional diagnostic equipment capable of reading parking-sensor data and clearing related fault codes. When in doubt, have the unit fitted by an experienced technician to ensure correct mounting, wiring integrity and system calibration.

Original Used Parking Assist ECU Designed For Citroën And Peugeot Models. This control unit Processes Signals From Ultrasonic Parking Sensors, Controls Audible And Visual Alerts And Interfaces With The Vehicle Electronics To Support Safe Low-Speed Maneuvering. Ideal For Professional Workshops And Skilled Do-It-Yourself Mechanics Looking To Replace A Faulty Parking Assist Module. Commonly Searched By Part Number 9629825180.

Key Features

Reliable Original-Part Replacement For Vehicles Equipped With Factory Parking Sensors. Direct Fit For Compatible Models When The Part Number Matches. Provides The Same Signal Processing And Output Functions As The Original Unit, Restoring Parking Aid Functionality When The Fault Lies In The Control Module.

Replacement And Installation Steps

• Park Vehicle On Level Ground And Switch Off Ignition.
• Disconnect Negative Battery Terminal Before Any Electrical Work.
• Locate Unit (Location Depends On Model — Often Mounted In The Rear Bumper Area, Boot Liner Or Near The Rear Lamp Cluster). Remove Interior Trim Panels To Access The Module.
• Disconnect All Electrical Connectors Carefully, Release Mounting Brackets And Remove The Faulty Unit.
• Install Replacement Unit, Reconnect Connectors And Secure Mounting Hardware. Refit Trim Panels.
• Reconnect Battery, Then Perform System Check And Sensor Test With A Diagnostic Tool. Some Vehicles Require Initialization Or Coding Of The Module To Restore Full Functionality.

Installation Recommendations

• Always Disconnect The Battery Before Removal/Installation And Follow The Vehicle Manufacturer’S Procedures To Avoid Damage To The Unit.
• Inspect Wiring Harnesses, Sensor Connectors And Fuses For Damage Or Corrosion Before Fitting The New Module.
• Protect Electrical Connectors From Moisture And Ensure Proper Sealing Of The Bumper/Boot Area After Reassembly.
• After Installation, Perform A Full Diagnostic Check And Sensor Calibration. Professional Coding/Initialization With PSA Diagnostic Equipment (DiagBox/Lexia) Is Recommended If The Vehicle Displays Fault Codes Or If The System Does Not Operate Correctly.

Most Common Reasons For Failure

• Water Ingress Or Corrosion Causing Short Circuits Or Connector Faults.
• Mechanical Damage From Rear Collision Or Impact To The Bumper Area.
• Electrical Surges, Faulty Wiring Or Poor Ground Connections.
• Degraded Internal Components Due To Age, Thermal Stress Or Long-Term Moisture Exposure.

Technical Information

• Manufacturer: Stellantis
• Model: Citroën C5; Citroën C8; Peugeot 807
• Product Codes: 9629825180
• Additional Numbers: 659078; 601746; NFP

Notes For Professionals

This Control Unit Processes Inputs From Ultrasonic Parking Sensors And Outputs Warnings To The Instrument Cluster Or Infotainment Display, As Well As Triggering Acoustic Signals. If Replacing The Module, Verify Sensor Integrity And Connector Pins To Avoid Repeating The Failure. When Fault Codes Persist After Swap, Use A Diagnostic Tool To Read Sensor Status, Perform Adaptations And Clear Historic Faults.

Why Choose This Part

Part Number Reference Increases Findability For Mechanics Searching By Code. This Unit Offers A Cost-Effective Solution To Restore Parking Assist Functionality When The Original ECU Has Failed, Provided The Part Numbers Match And Connectors Fit Correctly.

This parking assist control unit (ECU) is designed for Citroën and Peugeot vehicles and handles ultrasonic sensor input, obstacle detection logic and signal output to the vehicle’s display and audible warning systems. Ideal for professional workshops and DIY mechanics who search by OE numbers: 9629825480, 659078 or related references, this unit restores automated parking aid functions such as rear/side sensor processing and driver alerts. Compatible models commonly include Citroën C5, Citroën C8 and Peugeot 807, though fitment can vary by production year and equipment level. The unit receives sensor data via the vehicle CAN network, evaluates obstacle distance and issues appropriate visual and acoustic warnings to assist safe parking maneuvers.

Technical Information

• Manufacturer: Stellantis
• Model: Citroën C5; Citroën C8; Peugeot 807
• Product Codes: 9629825480; 659078
• Additional Numbers: 601746; NFP

Function

The parking assist ECU processes signals from ultrasonic (or other) parking sensors, monitors object proximity, calculates safe stopping distances and triggers dashboard indicators and acoustic beeps. It also communicates with other vehicle systems over the CAN bus to coordinate warnings and may disable/enable the system depending on selected gears or vehicle speed.

Typical Fault Symptoms

• Intermittent or permanent loss of parking sonar indications.
• Continuous audible alarms, false positives or constant beeping.
• Missing symbol or fault message on the instrument cluster related to parking assistance.
• Complete system inoperable despite sensors and wiring visually intact.

Why This Part Fails Most Often

Failures are commonly caused by moisture ingress, corrosion of connector pins, impact damage from minor collisions, wiring harness faults or short circuits. Environmental exposure (road salt, pressure washing) and ageing can degrade seals and electronics. Occasionally sensor faults or harness damage create symptoms that mimic ECU failure, so verify sensors and connectors before replacement.

How To Replace

Location varies by model; parking assist ECUs are often mounted in the rear luggage area, behind trim panels or under rear bumpers. Typical replacement steps:

• Disconnect the negative battery terminal before starting work.
• Remove interior trim panels or luggage compartment lining to access the unit.
• Document connector positions, then carefully unplug electrical connectors and remove mounting screws.
• Install the replacement unit, secure it, reconnect all plugs and restore trim.
• Reconnect the battery and run a system check. On some vehicles initialization or coding may be required to restore full functionality.

Installation Recommendations

Always disconnect the battery prior to removal/installation to prevent damage to electronics and follow manufacturer torque and handling guidelines. Check connectors for corrosion and repair or replace damaged sensor wiring before fitting the new ECU. After fitting, perform a full function test of all parking sensors and the parking assistance system. Where coding or adaptation is necessary, use PSA-compatible diagnostic equipment (DiagBox/Lexia/PP2000) or have the procedure performed by a qualified technician.

Expected Durability

When properly installed and protected from moisture and impact, parking assist ECUs typically last many years. Lifespan is heavily influenced by environmental exposure, the condition of connectors and any history of vehicle collisions.

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.