Description
VALEO Parking Assist Control Unit for Peugeot 307 II and Citroën C4
This VALEO parking assist control unit restores the ultrasonic parking aid functions on compatible Peugeot 307 II and Citroën C4 vehicles. Designed for professional workshops and experienced DIY mechanics, this control module processes signals from the rear (and where applicable front) sensors to provide audible and visual proximity warnings. The unit is frequently searched by product codes and OE numbers listed below, making it easy to locate for replacement or repair projects.
Technical Information
- Manufacturer: VALEO
- Model: Peugeot 307 II; Citroën C4
- Product Codes: 9661496880, 6590V3, 6590N1
- Additional Numbers: 6590FN, 6590FP, 601.990, NFP
Function
The control unit receives input from the ultrasonic parking sensors, interprets distance and obstacle data and communicates warnings to the vehicle’s dash display and acoustic buzzer. It also performs sensor diagnostics and may interface with other vehicle systems to inhibit autobrake or warnings when necessary.
Typical Replacement Procedure
- Safety First: Disconnect the negative battery terminal before starting to avoid short circuits and protect vehicle electronics.
- Access: Depending on the model, access the unit through the trunk lining, under the rear bumper or behind a trim panel. In some applications partial bumper removal is required to reach connectors and mounting points.
- Disconnect: Carefully unplug the wiring harness and any sensor connectors. Inspect connectors and pins for corrosion or damage.
- Remove: Unscrew or unclip the unit from its bracket and remove it from the vehicle.
- Install: Fit the replacement unit in the reverse order, ensuring connectors are fully seated and secured. Use dielectric grease on connectors if available to prevent future corrosion.
- Commissioning: After installation, perform a system check and sensor test. Some vehicles require calibration or coding with a PSA-compatible diagnostic tool (e.g., DiagBox/Lexia/PP2000) to restore full functionality.
Installation Recommendations
- Always disconnect the battery before removing the unit.
- Work in a dry, clean environment; moisture is a common cause of failure.
- Inspect and clean all sensor connections and wiring looms while the unit is accessible.
- If sensors or wiring show damage, repair or replace them before fitting the control unit to avoid repeated failures.
- Use a PSA diagnostic tool for final checks and calibration where available; if not available, run the vehicle’s built-in sensor tests and listen for proper buzzer operation during validation.
Why This Part Fails Most Often
- Water Ingress: Moisture entering the ECU or sensor connectors leads to corrosion and intermittent faults.
- Connector Corrosion: Salt and road grime cause poor electrical contact between the harness and unit.
- Impact Damage: Rear bumper impacts that deform sensors or the mounting can damage the control unit or its inputs.
- Sensor Failures: A faulty ultrasonic sensor can overload the control module diagnostics and trigger errors.
- Electrical Surges: Improper jump-starts or faulty vehicle wiring can damage internal electronics.
This control unit is commonly referenced by part numbers (9661496880, 6590V3, 6590N1, 6590FN, 6590FP). If you are a professional mechanic or an experienced DIYer looking to restore parking assistance on Peugeot 307 II or Citroën C4, this VALEO unit is a direct-fit replacement when the listed codes match your vehicle’s equipment.
