The FAURECIA seat heater relay is a direct replacement for a range of Citroën and Peugeot models and is frequently searched by part number (9638053380, 8904WC, 8906GR, 6545YN, FAURECIA 9445536). Designed to switch the high current required by seat heating elements, this relay ensures reliable operation of passenger and driver heated seats. Ideal for professional workshops and DIY mechanics, the unit restores proper seat heating function when the original relay becomes intermittent or fails entirely.

Key Benefits

• Direct fit for multiple Citroën and Peugeot models — simplifies sourcing by part number.
• Restores consistent heating performance and removes intermittent faults caused by worn relay contacts.
• Economical and quick replacement that eliminates diagnostics tied to heating element or thermostat faults.

How It Works And Typical Symptoms

The relay controls electrical power to the seat heating elements, acting as a high-current switch operated by a low-current control signal from the vehicle’s heater switch/module. Common symptoms of a failing relay include no heating, intermittent heating, heating that only works on one seat, or heating that cycles unpredictably. In many cases, dashboard switches and fuses are OK, pointing the fault to the relay.

Installation Recommendation

Basic replacement steps for a competent mechanic or experienced DIYer:

• Disconnect the vehicle battery before starting work to avoid short circuits and protect vehicle electronics.
• Locate the relay — it may be in a dedicated interior fuse/relay box, under the seat, or integrated into a module depending on model year and equipment.
• Remove any trim or fasteners necessary to access the relay socket, unplug the wiring connector, and pull out the faulty relay.
• Install the replacement relay by plugging it into the correct socket, secure any removed trim, and reconnect the battery.
• Verify seat heating operation and check for error codes if the vehicle displays related warnings.

Common Failure Causes

• Contact Wear And Pitting: Repeated switching of high current loads can erode relay contacts, causing higher resistance or complete failure.
• Corrosion Or Moisture Ingress: Water or humidity entering the relay housing or connector causes poor contact and intermittent operation.
• Overload Or Short Circuit: Faults in the seat heating element or wiring can overload the relay, leading to premature failure.
• Thermal Cycling: Frequent heating and cooling cycles accelerate material fatigue in internal components.

Technical Information

• Manufacturer: Faurecia
• Model: Citroën / Peugeot Seat Heater Relay
• Product Codes: 9638053380, 8904WC, 8906GR
• Other Numbers: 6545YN, FAURECIA 9445536, 9445536
• Compatible Models: Citroën C4 Picasso, Citroën C5, Citroën C5 X7, Citroën C8, Peugeot 207, Peugeot 3008 I, Peugeot 308, Peugeot 407, Peugeot 5008 I, Peugeot 807

Practical Tips

• When replacing the relay, inspect the mating connector and wiring for heat damage, corrosion or loose terminals and repair as needed to prevent repeat failures.
• If a relay failed due to a short in the seat element or wiring, replace or repair the faulty wiring/element before fitting a new relay.
• Keep replacement relays in stock by part number — technicians commonly search by the codes listed above for quick sourcing.

Why Choose This Part

This FAURECIA relay provides a cost-effective solution to restore seat heating functionality for many Citroën and Peugeot vehicles. With clear cross-reference part numbers and straightforward installation, it is well suited to both professional workshops and competent DIY repairs.