The Cadillac Catera high beam headlight uses an H7 bulb size, while low beam headlight applications utilize either H7 or D2S bulb sizes depending on the specific configuration. The replacement chart covers 1997 through 2001 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H7 bulb is a single-filament halogen type rated at 12V and 55W, built to ECE standards with a PX26d base. It holds approval for use in Europe, worldwide markets, the United States, and Japan.
The Cadillac Catera uses the H7 bulb for the high beam headlight across all model years from 1997-2001.
For the low beam headlight, the 1997-1999 Catera uses only the H7 bulb. The 2000-2001 model years introduced an alternative fitment depending on headlamp type.
On 2000-2001 Cateras equipped with halogen capsule headlamps, the low beam bulb remains the H7. Those equipped with HID headlamps use the D2S instead.
The D2S is a high-intensity discharge (xenon) bulb rated at 85V and 35W, carrying a P32d-2 base. It is designed specifically for projector-type housings and requires an external ignitor to operate, making it electrically and mechanically incompatible with standard halogen headlamp assemblies.
Because the H7 and D2S differ in base type, voltage, wattage, and housing requirements, the two low beam bulb types fitted to the 2000-2001 Catera are not interchangeable between headlamp variants.
The shared use of the H7 across both the high beam and the halogen low beam positions does not indicate interchangeability between those positions, as housing design and beam pattern requirements govern each application separately.