Description
Glow Relay CARTIER. Used part with a warranty of functionality.
This Cartier glow relay is a direct-fit electrical component for many Citroën and Peugeot diesel applications. Designed to control the pre-heating sequence of glow plugs, it regulates the current and timing to ensure reliable cold starts. The relay is commonly sought under the product numbers 9640469680 and 598140, so technicians and DIYers often find it by reference code when diagnosing hard-start issues on PSA vehicles.
Technical Information
- Manufacturer: Cartier
- Models: Citroën C4 Picasso, Citroën C5, Citroën C8, Peugeot 307, Peugeot 807
- Product Codes: 9640469680, 598140
- Additional Numbers: 9640469680 / 598140
Installation Recommendations
- Safety First: Disconnect the negative battery terminal before starting work to prevent short circuits and accidental cranking.
- Location & Access: The glow relay may be located in the engine bay fuse/relay box or mounted near the glow-plug control module depending on model and year. Remove the appropriate cover or trim to access the relay.
- Replacement Steps: Unplug the electrical connector, remove any securing screws or clip, swap the relay for the replacement unit, then reconnect the connector and secure the relay in position.
- Checks To Perform: Inspect wiring, terminals and ground points for corrosion or damage. Verify fuses in the glow-plug circuit before and after replacement.
- Post-Installation: Reconnect the battery, cycle the ignition to check glow-plug indicator behavior and, if available, clear related fault codes with a diagnostic tool. Perform a cold-start test to confirm correct pre-heating duration.
- Recommendation: Use appropriate hand tools and follow the vehicle manufacturer’s workshop manual for access and torque values where applicable.
Why The Part Most Often Fails
- Electrical Wear: Repeated high-current switching causes contact wear and eventual loss of conductivity inside the relay.
- Overload From Faulty Glow Plugs: Damaged or shorted glow plugs draw excessive current, overheating the relay and shortening its life.
- Corrosion And Moisture Ingress: Exposure to damp conditions or poor sealing can corrode terminals and internal components.
- Heat Cycling: Continuous thermal stress from repeated heating and cooling cycles leads to material fatigue.
Typical Symptoms
- Extended cranking or difficulty starting the engine in cold conditions.
- Glow-plug dashboard indicator behaving abnormally (stays on longer, flashes, or does not light).
- Intermittent starting problems that may improve as the engine warms up.
- Blown fuses in the glow-plug circuit or related fault codes recorded in the engine control unit.
This used Cartier glow relay is a practical replacement option for professional workshops and skilled DIY mechanics servicing Citroën and Peugeot diesel engines. By checking the part numbers and following the installation recommendations above, you can restore reliable pre-heating performance and improve cold-start behavior.
