Description
Seat Heater Relay Kongsberg 4539528 for Citroën, Peugeot, DS, Opel, Fiat, Toyota vehicles.
High-quality replacement seat heater relay designed for a wide range of Stellantis and allied platforms. Ideal for professional workshops and experienced DIYers, this relay restores reliable seat heating operation and is commonly searched by its part numbers (9673891680, 4539528, 6509ER). Durable design and direct-fit compatibility make it a practical spare for vehicles experiencing intermittent heating, blown fuses, or electrical faults related to seat comfort systems.
Key Features
- Direct replacement for OE references used on multiple Citroën, Peugeot and DS models.
- Manufactured by Kongsberg (reference 4539528) and cross-referenced with Stellantis numbers for quick identification.
- Restores proper switching of seat heating elements and protects wiring from repeated overloads caused by stuck contacts.
- Compact relay housing for easy integration into existing fuse/relay boxes or seat control modules.
Technical Information
- Manufacturer: Kongsberg
- Model: Seat Heater Relay / Seat Heating Relay
- Product Codes: 9673891680; 4539528; 6509ER
- Other Numbers: 4539528 | 6509er | 9673891680
Compatible Models (Typical Fitment)
Commonly fitted to a range of Citroën and Peugeot vehicles and some models from DS, Opel, Fiat and Toyota. Examples include:
- Citroën Berlingo III
- Citroën C3 III
- Citroën C5 (including C5 X7)
- Citroën C8
- Peugeot 308 (T9)
- Peugeot 5008 I
- Peugeot 807
- Peugeot Partner III / Rifter
- Peugeot 508
- Various DS, Opel, Fiat and Toyota models where the same relay reference is used
Installation Recommendation
- Always disconnect the vehicle battery before working on electrical components to avoid short circuits and accidental deployment of safety systems.
- Locate the relay in the vehicle’s relay/fuse box or seat control area. Access may require removal of seat trim or under-dash panels depending on model.
- Remove the old relay by unplugging the electrical connector and releasing any retaining clips or screws. Compare part numbers and connector shapes to ensure correct replacement.
- Fit the new relay in the same orientation, secure any clips, reconnect the wiring and reassemble trim panels.
- Reconnect the battery and verify seat heating function through vehicle controls. Check for blown fuses or error codes if heating does not operate as expected.
- For vehicles with body control modules that manage seat functions, confirm that the relay socket and wiring are free from corrosion or damage before installation.
Most Common Failure Reasons
- Contact Wear: Repeated switching cycles cause pitting and increased contact resistance, leading to intermittent operation or overheating.
- Corrosion and Moisture: Water ingress or condensation in relay housings and connectors causes poor electrical contact and eventual failure.
- Overcurrent Stress: Faulty seat heating elements or wiring shorts increase current draw and can weld relay contacts or damage the relay housing.
- Connector Issues: Loose, oxidised or damaged sockets and pins create heat build-up and unreliable performance.
- Age and Thermal Cycling: Long-term exposure to heat and vibration accelerates internal fatigue of relay internals.
Practical Tips
- When replacing the relay, inspect fuses, wiring harness, seat heating element continuity and connector condition to prevent repeat failures.
- Keep the contact area dry and apply dielectric grease to connectors if appropriate to reduce corrosion risk.
- Search by OE numbers (9673891680 / 4539528 / 6509ER) to quickly find the correct part for your vehicle.
This relay is intended for experienced fitters and DIY mechanics familiar with automotive electrical systems. Proper diagnostics prior to replacement helps ensure the underlying cause is resolved and avoids unnecessary part changes.
