Late s2 and early s3 Elises and Exiges (black dash) are fitted with a silent indicator relais or switchbox from factory. Always unsure if the indicator is off or on as it is lacking noise, and a real drawback of the quality perception of these series.
The relais involved is fitted above the center console under the dash. Access from the passengers footwell is comparatively easy. One of the relais is marked with the Perei brand logo (Perei produces the rear LED lighting) and this 3-pin relais can be wiggled out (no latches), and exchanged by a relais from the VAG group, or one of many from ebay or (hate to say..) amazon, google CF14 JL-2 flasher, 3-pin. Approximately 10 euro, gbp or dollar. Happy clicking!