Description
Airbag Control Unit For Citroën C4. We Do Not Know The Unit’S Condition; It Is Reported As Fully Functional, But It May Require Deletion Of CRASH Data.
This airbag control unit (SRS Module) is a frequently searched replacement part for Citroën C4 vehicles and is often referenced by part number 9662643980 / 603 72 61 00. Designed For Mechanics And Experienced Do-It-Yourselfers, The Unit Monitors Airbag And Pretensioner Circuits, Detects Collision Events, And Stores Crash Data. Installing A Correctly Functioning Airbag Control Unit Restores The Vehicle’S Occupant Restraint System To Operational Status After An Accident Or Electronic Failure. The Unit Is Suitable For Use In PSA/ Stellantis Platforms Related To The Citroën C4 (C4 I) Where The Listed Part Numbers Match.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Citroën C4 (C4 I)
- Product Codes: 9662643980
- Other Numbers: 603 72 61 00
Function
The Airbag Control Unit (SRS ECU) Continuously Monitors Crash Sensors, Airbag Inflators And Seatbelt Pretensioners. On Detecting A Collision That Exceeds Predefined Thresholds, The Unit Triggers Deployment Commands For The Relevant Restraint Devices And Records Event Data (CRASH Data). It Also Provides Diagnostic Fault Codes For The Airbag System And Communicates With Other Vehicle Control Modules.
Compatibility
This Unit Is Intended For Citroën C4 Vehicles Where The Listed Part Numbers Match The Vehicle’S Specification. Because Airbag ECUs Are Often Searched By OEM Number, Use The Above Product Codes To Confirm Fitment Against The Vehicle’S Parts List Or Repair Manual.
Replacement Procedure
- Disconnect The Battery And Wait At Least 10 Minutes To Allow The SRS Capacitors To Discharge.
- Remove Trim Panels As Required To Access The SRS Control Unit (Refer To Vehicle Repair Manual For Exact Location And Fasteners).
- Carefully Unplug Electrical Connectors, Note Connector Locks, And Remove Mounting Bolts.
- Install The Replacement Unit, Secure Fasteners To Manufacturer Specifications, And Reconnect Connectors Ensuring Proper Engagement.
- Use A Diagnostic Tool (For PSA Vehicles: DiagBox/Lexia) To Clear Fault Codes, Delete Or Reinitialise CRASH Data If Required, And Verify System Status. If The Unit Reports Persistent Faults, Follow Diagnostic Trouble Code Guidance.
Installation Recommendations
- Always Disconnect The Battery Before Starting Work And Observe Anti-Static/ESD Precautions To Protect Electronics.
- Follow Manufacturer Removals Steps And Torque Values. Do Not Tamper With Airbag Inflators Or Wiring.
- After Installation, Perform A Full SRS System Check With A Professional Diagnostic Tool To Confirm Fault-Free Operation.
- If CRASH Data Is Present, Use Appropriate Diagnostic Procedures To Delete Or Initialise The Unit According To PSA Service Instructions.
- Work On SRS Systems Should Be Performed By Qualified Personnel Or Experienced Technicians; If In Doubt, Consult The Vehicle Repair Manual.
Most Common Failure Causes
- Activation During A Collision — Unit Will Store CRASH Data And May Need Deletion Or Replacement.
- Water Ingress Or Corrosion On Connectors Causing Intermittent Or Permanent Faults.
- Electrical Surges Or Short Circuits Damaging Internal Electronics.
- Physical Damage From Improper Removal, Impact, Or Previous Repair Attempts.
- Aging Or Component Wear In Older Vehicles Leading To Erratic Behaviour Or Diagnostic Failures.
Part Numbers Like 9662643980 And 603 72 61 00 Are Common Search Terms For This Unit — Using These Codes In Searches Improves Chances Of Finding The Correct Replacement Quickly.
