The low-beam bulb depends on whether your RDX has halogen or HID headlights: halogen low beams typically use H11 bulbs, while factory HID low beams use a D2S xenon bulb with a ballast.
Understanding the headlight configuration
The 2013 Acura RDX can come with different headlight setups depending on trim and market. Knowing which system your vehicle has will determine the correct bulb type for the low beam. Below are the two common configurations and their bulb types.
Halogen low beams
In models equipped with standard halogen headlights, the low-beam bulb is usually a single H11 type. This is a straightforward replacement and does not require a ballast.
- H11 – 12V, 55W (low-beam halogen bulb)
Note: Some regional or dealer-installed variations exist. If your bulb looks different or you’re unsure, consult your owner’s manual or inspect the bulb itself for markings.
High-Intensity Discharge (HID) low beams
For RDX models with factory HID headlights, the low-beam bulb is a xenon bulb used with a ballast. The most common stock bulb type is D2S, though some markets could use similar D-series variants with ballast integration.
- D2S – Xenon low-beam bulb (with ballast)
Note: Some regions or trims may feature different HID bulb families (such as D1S or D3S) or variations in ballast design. Always verify via the owner’s manual or by inspecting the bulb/ballast assembly on your vehicle.
How to verify the correct bulb for your car
There are reliable ways to confirm the exact bulb you need, preventing misorders or fitment issues. Use one of these methods or a combination for best results.
- Check the owner’s manual or a dealership service bulletin for the bulb part number specified for your vehicle’s VIN.
- Remove the current low-beam bulb and read the markings on the base or glass. The bulb code (for example H11 or D2S) is usually printed on the metal base or plastic connector.
- Look for a ballast or HID components in the headlight area. The presence of a ballast suggests HID (D2S) bulbs rather than halogen (H11).
Once you know whether you have halogen or HID headlights, you can purchase the correct bulb with confidence and ensure proper alignment and performance after replacement.
Summary
In short, the 2013 Acura RDX uses H11 bulbs for halogen low beams and D2S bulbs for HID low beams, with regional or trim variations possible. Always verify by checking the manual, inspecting the current bulb, or consulting a dealer to avoid buying the wrong type.