Description
Bosch Control Unit – Parking Assist
Used Bosch parking assist control unit suitable for a range of Citroën and Peugeot vehicles. This module manages ultrasonic parking sensors, processes obstacle information and communicates alerts to the driver. Often searched by part numbers such as 0263004204 or 9663821680, this unit is a direct-fit electronic control unit used in many Stellantis models. Ideal for professional workshops and experienced DIY mechanics looking for a reliable replacement part.
Description
This parking assist control unit from Bosch is designed to process signals from the vehicle’s ultrasonic sensors and provide audible and/or visual proximity warnings to the driver. It interfaces with the vehicle CAN bus and the vehicle’s central body systems to coordinate sensor inputs, parking guidance and alarm outputs. The module is widely used on Citroën and Peugeot models and is commonly replaced when sensors or connections have been exposed to moisture, impact or electrical faults.
Technical Information
- Manufacturer: Bosch
- Model: Citroën / Peugeot Parking Assist Control Unit
- Product Codes: 0263004204, 9663821680
- Additional Numbers: 1606383380, 1606383480, 1606516180, 1606516380, 6590EV, 6590EW, 263004204
- Compatible Vehicles (examples): Citroën C3, Citroën C3 Picasso, Citroën C4 Picasso, Citroën C5, Peugeot 207, Peugeot 308
How It Works
The unit collects signals from the ultrasonic sensors mounted in the bumper, filters and analyses distance measurements and detects obstacles. Based on this processing it triggers the vehicle’s audible chimes and dashboard indications and can relay information to other on-board systems. Proper operation depends on intact sensors, clean connectors and a stable vehicle electrical supply.
How To Replace (Practical Steps)
- Locate The Unit: Typically installed in the rear of the vehicle (boot/trunk area) behind trim panels or under the parcel shelf. Exact location varies by model—remove trim panels carefully to access the module.
- Safety First: Disconnect The Battery Before Any Work On Electrical Modules To Avoid Short Circuits Or Damage.
- Disconnect Connectors: Release Locking Clips On Electrical Connectors; Inspect For Corrosion Or Bent Pins.
- Remove Mounting: Unscrew Or Unclip The Module From Its Bracket, Retain Fasteners For Reinstallation.
- Install Replacement: Fit The New Module, Reconnect All Plugs Securely And Reinstall Trim. Reconnect Battery And Verify Basic Functionality.
- Verify And Calibrate: Some Vehicles Require Diagnostics Or Basic Checks To Confirm Sensor Operation. Use Proper Diagnostic Equipment To Run System Tests.
Installation Recommendation
Although the replacement procedure can be completed by experienced DIYers, correct diagnosis and potential configuration require diagnostic tools. It is recommended to check all sensor connectors and wiring for damage and corrosion before installation. After fitting, run a full system check with appropriate diagnostic equipment to ensure sensors and warnings operate correctly.
Reason For Most Common Failures
Parking assist control units tend to fail due to moisture ingress and corrosion of connectors, physical impact to sensors or the bumper, degraded solder joints from thermal cycling, or electrical faults such as short circuits and voltage spikes. Sensor failures or damaged wiring can also produce symptoms that appear to be a control unit fault, so thorough testing of sensors and harnesses is important before replacing the module.
