BMW X3 X4 F25 F26 BIX Xenon TMS Headlight Module 63117421578 LEAR 7421578

BMW X3 X4 F25 F26 BIX Xenon TMS Headlight Module 63117421578 LEAR 7421578

This is a high-quality aftermarket replacement TMS (Thermal Management System) control module, compatible with BMW part number 63117421578 and LEAR 7421578, designed for use in Bi-Xenon (BIX) headlight systems on the BMW X3 F25 (2010–2017) and BMW X4 F26 (2013–2018).

This TMS unit manages various essential headlight functions, including:

• DRLs and Angel Eyes (LED ring illumination)
• Vertical headlight aim and leveling
• Adaptive cornering (AFS) where equipped
• Turn signal integration and eyebrow light function

If you're experiencing dashboard faults such as “Adaptive Headlight Failure,” flickering DRLs, or non-functional angel eyes, replacing the TMS module is a quick and cost-effective repair that avoids full headlight assembly replacement.

Typical Faults:

• Dashboard warning lights or headlamp fault messages
• DRLs / Angel Eyes not working or flickering
• Adaptive lighting (curve light) malfunction
• Vertical aim/height adjustment failure
• Eyebrow light or turn indicator not illuminating

Features:

• 100% brand new aftermarket unit
• Direct OE replacement with plug-and-play installation
• Fits both left and right headlights
• Waterproof IP67-rated and shockproof
• No coding required in most cases

OEM Compatible BMW Part Numbers:

• 63117421578
• 63117363098
• 63117316151
• 7363098
• 7421578
• 7316151

LEAR Part Number:

• LEAR 7421578

Vehicle Fitment:

✅ BMW X3 (F25) – Model years: 2010–2017
✅ BMW X4 (F26) – Model years: 2013–2018

Applies to vehicles equipped with factory Bi-Xenon headlamps.