BMW E90 E92 E93 Headlamp Switch - Used Original Parts

Diagnosis and Common Symptoms

From the M.S. Motor workshop, we see these units fail in predictable ways. A faulty headlamp switch, which is integrated into the Light Control Module (Lichtschaltzentrum), can manifest as more than just an unresponsive knob. Clients often report intermittent operation of headlights, parking lights, or fog lamps. A primary indicator is the failure of the "Auto" headlamp function, where the system either stays on permanently or fails to activate in low light.

On the diagnostic side, you may not always get a direct fault code for the switch itself. Instead, the Footwell Module (FRM) may log communication errors or implausible signal faults, such as A8A8 (Short circuit, fog lights) or A8A9 (Bi-xenon headlight fault), which can be triggered by an internally shorted switch. Visually, you might notice flickering instrument cluster illumination or the switch backlighting failing. In severe cases, a faulty switch can prevent the FRM from entering its sleep cycle, leading to parasitic battery drain.

Introduction

Restore precise control over your BMW's lighting system with a fully functional control unit. This Genuine BMW Headlamp Switch has been professionally removed from a donor vehicle and has undergone rigorous bench testing by our technicians. We verify the functionality of every rotary position, button press, and the dimmer rheostat to ensure it meets factory operational standards. It provides a reliable and cost-effective resolution to common lighting faults without the risk associated with unverified, low-quality aftermarket parts.

Product Details

• Brand: BMW

• Model Compatibility: E90 Sedan, E92 Coupe, E93 Convertible (3-Series)

• Part Name: Headlamp Switch / Light Control Unit

• Condition: Genuine Used (Tested Working)

• Notes: This unit interfaces directly with the vehicle's Footwell Module (FRM). Ensure the part number and icon configuration (e.g., front/rear fog lights, auto headlamps) match your vehicle's original switch to guarantee full compatibility.