Description
Overview
This Parking Assist ECU (Electronic Control Unit) is a dedicated control module for Citroën and Peugeot vehicles from the PSA Group. Supplied with the referenced OE numbers, it manages ultrasonic parking sensors and the parking-assistance functions to help drivers detect obstacles when reversing or parking. Commonly identified by part numbers such as 9629825180 and 601.746, this unit is aimed at professional fitters and experienced DIYers who require accurate OE cross-references.
Key Features
- Direct replacement control unit for parking assistance systems.
- Recognizes and controls multiple ultrasonic sensors, providing audible and/or visual feedback to the vehicle’s driver interface.
- OE cross-references included in the product codes to simplify part matching.
- Suitable for workshop installation; may require diagnostic tool for coding and calibration.
Function And Benefits
The unit processes signals from the parking sensors and determines distance to obstacles, triggering warnings through the vehicle display or audible buzzer. Replacing a faulty ECU can restore accurate sensor processing and eliminate false alarms, intermittent operation or total loss of the parking assist function. Installing the correct OE-matched module helps maintain factory behavior and compatibility with vehicle wiring harnesses and sensor sets.
Common Failure Modes And Service Life
Failures are typically caused by electrical issues (corrosion on connectors, short circuits), water ingress or impact damage to the area around the module, and age-related component degradation. Symptom examples include continuous alarm, no sensor response, or inconsistent distance readings. Service life depends on vehicle usage and environmental exposure; careful inspection of connector condition and sensor harnesses is recommended when replacing the unit.
Replacement And Installation
Recommended steps for removal and fitting:
- Disconnect the battery negative terminal before beginning work to prevent shorts.
- Locate the parking assist ECU—commonly mounted in the rear luggage area, behind trim panels or in the bumper area on PSA vehicles. Exact location varies by model.
- Remove interior trim panels or covers as required to access the unit. Keep fasteners and clips organized.
- Unplug the ECU electrical connectors carefully, noting any locking tabs or guides.
- Fit the replacement unit, secure mounting fasteners and reconnect all plugs.
- Reconnect the battery and clear any stored fault codes with a diagnostic tool. Perform required coding or module pairing if necessary.
- Test all parking sensors and parking-assist functions before returning the vehicle to service.
Programming & Diagnostic Notes
After physical replacement, the ECU may require programming or pairing to the vehicle using manufacturer-level diagnostic equipment (e.g., Tech2, Lexia/Diagbox or compatible aftermarket diagnostic tools). Failure to code or adapt the unit can result in improper operation or fault codes. Always verify sensor operation and run a full system check.
Technical Information
- Manufacturer: PSA (Citroën and Peugeot)
- Model: Select Citroën and Peugeot models (PSA Group) — verify fitment by VIN or OE number; e.g., Citroën C3, C4, C5; Peugeot 207, 308, 3008 (confirm compatibility before ordering)
- Product Codes: 9629825180, 659078
- Additional Numbers: 601746, NFP
Always confirm exact part number compatibility with the vehicle VIN or manufacturer parts catalog prior to purchase. If you are uncertain about fitment or programming requirements, consult a professional workshop or contact technical support for guidance.
