D1S HID Headlamp Ballast for BMW Audi VW GMC Volvo, Fits 89034934 4L0907391

Restore crisp, reliable HID lighting without replacing your entire headlight housing. This aftermarket D1S HID headlamp ballast serves as a direct OE replacement for igniters that fatigue due to prolonged heat exposure, moisture ingress, or internal circuit board degradation. Specifically calibrated to reference numbers 4L0907391 and 89034934, it supplies consistent high-voltage current to your discharge bulbs, erasing symptoms like erratic flashing, slow warm-up times, and intermittent power loss. Built to fit seamlessly across diverse BMW, Audi, Volkswagen, Volvo, Renault, and GMC chassis, each unit receives full factory cycle testing to ensure immediate activation and long-lasting resistance to road vibration and thermal stress.

Practical Application Tips

• Pair this module with newly purchased D1S bulbs, as worn filaments often mimic ballast failure and complicate troubleshooting.
• Cut power to the vehicle before disconnecting the old unit to prevent transient voltage spikes from affecting infotainment or dashboard modules.
• Lubricate exposed copper contacts with dielectric grease before reconnecting to shield terminals from corrosive road spray and brake dust.

Technical Specifications

• Connector Type: D1S semi architecture
• OE Cross Reference Numbers: 4L0907391, 89034934, VZ739, 63117180050, 30784293, 6224L8, 7701208945
• Safety Compliance: CE certified construction
• Production Grade: 100% virgin manufacturing, shop verified
• System Role: Headlamp projection assembly driver

Package Includes

• 1 × D1S HID Headlamp Ballast

Important Reminders

Wiring diagrams and mounting guides are excluded from this shipment, so enlisting a certified auto electrician remains the safest approach for proper harness routing and secure mounting. Minor visual shade variances may occur because of monitor color profiles, and verifying your original connector angle before ordering prevents unnecessary returns.

All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.

We have supplied precision automotive components to garages and DIY builders at intercyprus.com since 2002.