Part description

This chassis unit / suspension control unit is a used original part for Citroën and Peugeot cars. According to the available documents, it comes from a Citroën C4 Picasso. It is an electronic part designed to control functions related to the suspension system, therefore it is important to observe the match of product numbers during selection and assembly.

Auto mechanics and home repairers often search for this part precisely by the designation 9664385080, or by other associated codes. For used control units, correct marking is essential for successful replacement and subsequent commissioning.

Technical information

• Manufacturer: Stellantis Citroën Peugeot
• Model: Citroën C4 Picasso
• Other numbers: 5273N1, 5273P4, 5273N2

Product codes

• Product codes: 9664385080, 5273N1, 5273P4, 5273N2
• Models from labels/backgrounds: Citroën C4 Picasso

Installation recommendations

Since the documents do not contain the exact assembly procedure for a specific car design, below is a general procedure typically for replacing a control unit of this type. The exact steps may vary depending on the specific model and equipment of the vehicle.

1) Before assembly

• Check that the product number 9664385080 and other markings on the part match.
• Compare the connectors, mounts, unit shape and contact condition with the old piece.
• Check that the used part is not mechanically damaged, clogged or with corrosion on the pins.
• Before working, disconnect the battery and wait for the car’s electrical system to calm down.

2) Necessary tools and materials

• Basic set of common hand tools
• Plastic pry bar or tool for gentle release of covers
• Clean cloth for cleaning the surroundings and connectors
• Possibly diagnostic equipment to check unit communication after assembly

3) Step-by-step assembly procedure

1. Secure the vehicle against movement and turn off the ignition.
2. Disconnect the battery according to normal service practice.
3. Access the area where the unit is located by removing covers or adjacent parts if necessary.
4. Check the condition of the wiring and connectors before disconnecting the old unit.
5. Disconnect the electrical connectors carefully so as not to damage the latches.
6. Remove the old unit from the bracket or mount.
7. Compare the old and new part by numbers, connectors and design.
8. Place the used unit in place and secure it properly.
9. Connect the connectors without using excessive force and verify that they are fully seated.
10. Reassemble all covers and removed parts of the surroundings.
11. Connect the battery.
12. Perform a function check and diagnostic load of the system as needed.
• 4) Post-assembly checks and test drive/function verification
  • Check that the unit communicates with the car system without dropouts.
  • Verify there are no loose connectors or unstable power supply.
  • During test verification, observe the behavior of the suspension system and any non-standard manifestations.
  • After a short period of operation, recheck the fastening of the unit and the condition of the connectors.

  5) The most common assembly mistakes + how to avoid them

  • Part exchange by similar number – always compare the full designation.
  • Damage to connectors – disconnect and connect connectors carefully, without prying with force.
  • Connecting with the ignition on – work with the system off and the battery disconnected.
  • Observation of subsequent diagnostic check – after installation, it is advisable to verify correct communication and system function.

  Reasons why the part is damaged

  • Moisture, seepage or prolonged exposure to dirt
  • Corrosion of contacts and connectors
  • Voltage fluctuations in the vehicle’s electrical system
  • Damage to the wiring or transition resistances in the connectors
  • Mechanical stress, vibration and unprofessional handling during previous disassembly
  • Age of electronic components and normal wear and tear
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