Description
Parking Assist Control Unit for Citroën and Peugeot Vehicles
This parking assist control unit (ECU) is designed for Citroën and Peugeot passenger cars to manage ultrasonic parking sensors, process sensor signals and provide audible/visual proximity warnings. It is a direct-fit electronic module commonly searched by part number and used by professional workshops and experienced DIY mechanics for replacement or repair projects. The unit interfaces with the vehicle wiring harness and dashboard warning systems and is essential for reliable operation of the parking aid.
Fitment And Compatibility
Compatible With: Citroën C5, Citroën C8, Peugeot 807. Often referenced by original part numbers during searches and orders to ensure correct match for chassis and trim variations. Verify physical connector and mounting location against the vehicle before installation.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Parking Assist Control Unit
- Product Codes: 9650400280, 659078
- Additional Numbers: 601881
Function And Symptoms
The module receives signals from ultrasonic sensors, evaluates obstacle distance and speed, and sends outputs to the audio/visual warning system and vehicle CAN network. Typical fault symptoms when the unit malfunctions include constant or intermittent parking sensor warnings, loss of sensor functionality, erroneous beeping, or no response from the parking aid system. Fault codes related to sensor communication or internal electronics are usually recorded in the vehicle diagnostic memory.
Replacement Procedure (Overview)
- Prepare Tools: trim removal tools, basic hand tools and a diagnostic scanner recommended for post-installation checks.
- Safety First: Disconnect the vehicle battery before any work on electronic modules to avoid short circuits and unit damage.
- Access Unit: The ECU is typically mounted in the luggage compartment or behind rear trim panels near the bumper; remove relevant trim to reach the module.
- Disconnect: Unplug the electrical connector(s) and remove any fasteners holding the unit in place.
- Swap Unit: Replace with the new control unit, secure fasteners and reconnect the wiring harness ensuring connectors click into place.
- Reassembly: Refit trim panels and reconnect the battery.
- Diagnostic Check: Run a full parking aid test and clear recorded fault codes. Calibration or coding of the parking system may be required for correct operation—use a compatible PSA diagnostic tool for configuration and sensor tests.
Recommended Tools And Post-Installation
After installation, perform a sensor self-test and a system check with a PSA-capable diagnostic interface (e.g., DiagBox, Lexia, PP2000) to confirm communication and to clear any fault codes. If sensors or wiring remain faulty, the control unit may still report errors until the root cause is addressed.
Why This Part Fails
Common causes of failure are water ingress and connector corrosion (especially in rear-mounted units), impact damage from collisions, wiring short circuits or intermittent connections, and internal electronic component failure due to age or voltage spikes. Often the parking sensors themselves or damaged harnesses trigger a fault that appears to be the ECU—troubleshooting both sensors and wiring is recommended before replacing the module.
Notes For Buyers
This unit is frequently searched by part number 9650400280. Check the listed product codes (9650400280, 659078, 601881) against the vehicle paperwork or the label on the original module to confirm compatibility. For reliable commissioning and calibration, consider professional installation or at least a diagnostic check after fitting.
