Xenon HID Ballast 25794777 for Cadillac CTS Chevrolet Camaro (2008-2014)

New D1S xenon HID headlight ballast control unit for Cadillac / Chevrolet, replacing GM part 25794777, for the 2008-2014 Cadillac CTS and 2010-2013 Chevrolet Camaro with factory HID headlights. Replacement for GM, not sold as Genuine GM. Free shipping to the lower 48.

Fix a Dark or Flickering HID Xenon Headlight

The ballast powers the factory D1S xenon bulb. When it fails the headlight can flicker, cut out or stay dark even with a good bulb. The seller lists it as no modification, no programming, direct plug-in.

Fits

Fits vehicles with the factory HID Xenon headlamp. Match the part number on your old module before ordering.

OEM / Interchange Part Numbers

• 25794777

Common Signs of a Failed Module

• Headlight goes out after a few seconds or minutes
• Headlight flickers or cycles on and off
• One headlight dead while the bulb is good
• Headlight color shifts or the lamp won't strike

Specs

• Brand: OEM-type replacement for Cadillac / GM 25794777
• Bulb type: D1S / D1R
• Input voltage: 12 V
• Placement: front left or right
• Condition: new, sold as one unit

What's Included

• 1 x D1S xenon HID ballast for GM 25794777

Installation

1. Turn the headlights and ignition off and disconnect the negative battery cable. Let the bulb and ballast cool.
2. On the Cadillac CTS and Chevrolet Camaro the ballast is mounted to the bottom or back of the headlamp housing. Depending on the vehicle you may reach it through the wheel-well liner, or you may need to loosen the bumper cover and unbolt the headlamp to pull it forward.
3. Unplug the main power connector and the igniter/bulb lead, then remove the screws holding the ballast to the housing.
4. Compare the part number on your old ballast to the numbers above before fitting the new one.
5. Fit the new ballast, refit its screws and lock every connector fully. The seller notes no programming is needed.
6. Reinstall the headlamp and trim, reconnect the battery and test low beam (and high beam if bi-xenon).

FAQ

Is this Genuine GM?
It is sold as a new OEM-type replacement for GM 25794777, not as a Genuine GM-boxed part.

Does it fit the Camaro?
Yes, 2010-2013 Chevrolet Camaro with factory HID headlights, per the seller's fitment guide.

Is shipping free?
Yes, shipping is free to the lower 48 US states.