Description
Antenna Impedance Module, Impedance Adapter AM/FM1 for Citroën C5 X7
This antenna impedance module is a direct-fit impedance adapter designed for Citroën C5 (X7) vehicles. Commonly referenced by part numbers 9662924980, 6561RK and 9662924980-00, the unit matches antenna impedance to the factory radio to ensure stable AM and FM reception. Ideal for professional workshops and experienced DIY mechanics who search by product code, this module restores correct signal transfer between the vehicle antenna and head unit, eliminating poor reception, intermittent reception, or missing bands when the original adapter has failed.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C5 (X7)
- Product Codes: 9662924980; 6561RK; 9662924980-00
- Other Numbers: AM/FM1
Function And Benefits
The module provides impedance matching between the vehicle antenna system and the radio head unit, reducing signal reflections and losses across AM and FM bands. Proper matching improves signal-to-noise ratio, reduces hiss and fading, and helps maintain consistent reception across different frequency ranges. It also adapts connector interfaces used by the factory antenna and radio harness.
Fitment And Compatibility
Designed for Citroën C5 X7 models fitted with the factory AM/FM antenna system that uses the AM/FM1 impedance adapter. Always verify the part number against the unit being replaced; many technicians locate this part by its OEM codes (9662924980 / 6561RK / 9662924980-00).
Replacement Procedure
Typical replacement steps for technicians and competent DIYers:
- Disconnect The Battery: For safety, disconnect the negative terminal before beginning any work on the vehicle electrical system.
- Access The Module: The adapter is usually located near the antenna base, inside the roof lining, in the antenna mast area or within the rear trim depending on vehicle specification. Remove interior trim panels carefully to avoid damage.
- Disconnect Connectors: Unplug the antenna coaxial connector and any radio harness plugs. Inspect connectors and cabling for corrosion or damage.
- Fit New Unit: Install the replacement module, ensuring correct seating of coaxial connectors and secure mounting. Avoid excessive force on connectors and cabling.
- Test Function: Reconnect the battery and test AM/FM reception with the factory radio. Check for steady reception, absence of noise, and correct band operation before reassembling trim.
- Finalize: Refit all trim panels and ensure all clips and screws are secure.
Installation Recommendations
Use contact cleaner on corroded connectors and replace damaged coaxial leads. Ensure connectors are dry and free of debris before reconnecting. Route cables away from sharp edges and secure them with clips to prevent chafing. After installation, verify radio reception over several frequencies and driving conditions. If reception issues persist, inspect the antenna mast, feeder cable continuity, and the head unit input.
Why This Part Most Commonly Fails
Common failure causes include water ingress and corrosion at connectors, mechanical damage to the antenna mast or coaxial cable, degraded solder joints inside the adapter due to vibration and age, and electrical surges from lightning or jump-start events. Symptoms of a failing module are weak or intermittent AM/FM reception, excessive noise, loss of one band, or total absence of radio signal despite a functional head unit.
Searching By Part Number: Many workshops and DIYers find this component using OEM codes 9662924980, 6561RK or 9662924980-00—include these numbers when ordering to ensure correct replacement.
