The Citroen ID19 front and rear turn signal bulbs both utilize a 1157 bulb size. The replacement chart covers vehicle production spanning 1969 to 1970.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 is the sole bulb type listed across all turn signal positions for the Citroen ID19, appearing in both the front and rear turn signal applications for the 1969-1970 model years.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve two distinct lighting functions at different wattages.
The 1157 operates on a 12-volt electrical system and draws 21 watts on its primary filament and 5 watts on its secondary filament, with the higher-wattage filament typically associated with the turn signal function.
The 1157 uses a BAY15d bayonet base, which is an offset twin-pin base. The two pins are positioned at different heights, a design that prevents incorrect insertion by ensuring the bulb can only be seated in one orientation.
The 1157 is classified as an ANSI standard bulb applicable to the United States and Canadian markets, indicating it conforms to a defined North American specification rather than a European or international standard.
Because the 1157 is used in both the front and rear turn signal positions on the ID19 for 1969-1970, the same bulb type serves all four turn signal sockets on the vehicle.
The BAY15d base of the 1157 is not interchangeable with single-pin bayonet bases such as the BA15s, nor with the 1156, which shares a similar appearance but carries only a single filament and a different pin configuration.