Description
Airbag unit for CITROEN C4 cars of the first series
The unit is fully functional
Part description
This airbag unit Citroën C4 is a used original part designed for CITROEN C4 first series cars. It is an important security system control unit that is often searched for by serial numbers. Thanks to the specified codes, it is particularly suitable for accurately locating the correct part when repairing or replacing a damaged original unit.
For mechanics and home repairers, it is essential that this is a fully functional part. In the case of used electronic car parts, the correct matching of numbers is essential for problem-free assembly and the subsequent function of the system.
Technical information
- Manufacturer: Stellantis Citroën Peugeot
- Model: Citroën C4 first series
- Other numbers: 603725800, 654633, 654634
Product codes
- Product codes: 9662643680, 603725800, 654633, 654634
- Model names: Citroën C4
Installation recommendations
Warning: This is a part of the vehicle’s passive safety system. In general, the assembly of this type of part should be done very carefully and in compliance with safety procedures. The exact steps may vary depending on the specific car model.
1) Before assembly
- Check that all markings on the original and new part match, especially 9662643680 and other numbers listed.
- Inspect the connectors, pins and body of the unit for mechanical damage, oxidation or contamination.
- Verify that the used part does not show signs of moisture, cracks or improper handling.
- Before starting work, disconnect the battery and wait a reasonable time according to normal service practice for working on the airbag system.
2) Necessary tools and materials
- Basic set of hand tools
- Suitable bits and attachments for removing covers and fixing the unit
- Cleaning agent for electrical contacts
- Protective gloves and work lighting
- Diagnostic equipment to check the system after assembly
3) Step-by-step assembly procedure
- Park the vehicle in a safe place and secure it against movement.
- Turn off the ignition and disconnect the battery.
- Access the space of the original unit according to the design of the car.
- Carefully remove any covers or parts that prevent access to the unit.
- Unplug the electrical connectors without using excessive force and check their condition.
- Unfasten the old unit and remove it.
- Compare the old and new part by number, connectors, mounting and overall design.
- Place the replacement unit in its original place and fix it in the same way as the original piece.
- Connect the connectors so that they are properly secured and without straining the wiring.
- Reinstall all covers and removed parts of the interior or access elements.
- Connect the battery.
- Perform a system check using appropriate diagnostics to verify that there are no malfunctions related to the airbag system.
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4) Post-assembly checks and function verification
- Check the correct seating of the unit and the connectors.
- Verify that the system does not show an obvious malfunction when the ignition is turned on.
- Check the status of the unit and any stored faults using diagnostics.
- After installation is complete, monitor for repeated passive safety system error conditions.
5) The most common assembly mistakes + how to avoid them
- Part exchange by incomplete number – always compare all available codes.
- Connecting with the battery connected – always disconnect the battery first before working on the airbag system.
- Damage to the connectors – disconnect the connectors gently and without prying with unsuitable tools.
- Omission of diagnostic check – after assembly, it is advisable to check the system with diagnostics.
- Vehicle impact or airbag system activation
- Moisture and leakage into the interior or to the storage area of the unit
- Damage to connectors, wiring or contacts
- Overvoltage in the vehicle’s electrical system
- Unprofessional handling during disassembly or assembly
- Long-term vibrations and mechanical stress
