Part description

This airbag unit is a used original car part intended for Citroën C2 and Citroën C3 cars. It is an important electronic component of the vehicle’s safety system, which processes data from crash sensors and controls the activation of the relevant passive safety elements.

The part is suitable for mechanics as well as for more experienced DIYers looking for a specific part by serial number. When choosing, it is therefore essential to compare all the markings on the unit and on the original part in the car.

Technical information

• Manufacturer: Stellantis Citroën Peugeot
• Model: Citroën C2, Citroën C3
• Other numbers: 6546C7, 6546C8, 6545S5

Product codes

Product codes: 9661532480, 6545S0

• Citroën C2
• Citroën C3

Installation recommendations

Be very careful with the airbag unit. The exact steps may vary depending on the specific car model, but generally the following procedure applies to this type of part.

1) Before assembly

• Check that all the numbers on the new and original part match.
• Check the condition of the connectors, pins and body of the unit for mechanical damage.
• Verify that the used part does not show signs of moisture, corrosion or improper handling.
• Before working, always disconnect the battery and leave the car at a standstill according to normal service practice.

2) Necessary tools and materials

• regular set of hand tools
• suitable attachments for removing covers and fixing the unit
• cleaning agent for electrical contacts
• protective gloves and basic workshop equipment
• diagnostic equipment to check the system after assembly

3) Step-by-step assembly procedure

1. Turn off the ignition and disconnect the battery.
2. Please allow a reasonable amount of time per normal service practice for the system to safely disconnect.
3. Access the space to the unit according to the design of the specific car.
4. Carefully disconnect the electrical connectors from the old unit without damaging the locking elements.
5. Dismantle the fixing of the original unit and remove the part.
6. Compare the old and new unit at a glance: numbers, connectors, mounting and overall design.
7. Place the used unit in place of the original part.
8. Attach it using the original attachment method.
9. Connect the connectors so that they are properly seated and secured.
10. Check that there is no pinched wiring or loose connection anywhere.
11. Reinstall all removed covers and related parts.
12. Connect the battery and perform a basic system check.
• 4) Post-assembly checks and test drive/function verification
  • After connecting the power, check whether there are no warning messages or lights indicating a system fault.
  • It is recommended to perform a diagnostic check and verify the communication of the unit with the vehicle system.
  • After installation, monitor for repeated error states or communication failures.
  • Perform test verification only with an emphasis on security and without unnecessary intervention in the system.

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

  • Assembly without disconnecting the battery – always safely disconnect the power supply first.
  • Exchanging a part by incomplete marking – compare all numbers on the label.
  • Damage to the connectors due to careless handling – release the connectors carefully and without violence.
  • Omit oxidation or damaged pins – check contacts carefully before assembly.
  • Skip the post-replacement diagnostic check – always verify proper system operation after installation.

  Reasons why the part is damaged

  • result of a crash or impact event
  • water ingress and long-term exposure to moisture
  • damage to wiring or connectors
  • corrosion of contacts and internal parts of the unit
  • unprofessional disassembly or assembly
  • voltage fluctuations in the vehicle’s electrical network
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