Mercedes Benz W166 W204 W212 Sunlight headlight Sensor Module A1669007101 – Original Used Part

Description

Product Title

Mercedes Benz W166 W204 W212 Sunlight headlight Sensor Module A1669007101 – Original Used Part

Diagnosis and Common Symptoms

The sunlight and headlight sensor module (A1669007101) is a dual-purpose component responsible for monitoring ambient light for the automatic headlamp system and measuring solar intensity for the Thermotronic climate control. When this sensor fails, the vehicle's convenience systems lose their "eyes." Common fault codes associated with this module include B12A1 (Sunlight Sensor Malfunction) or communication errors on the LIN bus.

Physical symptoms include:

• Automatic headlights staying on even in bright midday sun.
• Headlights failing to activate automatically when entering tunnels or during dusk.
• The climate control system blowing inconsistent air temperatures or failing to increase fan speed when the vehicle is in direct sunlight.
• "Light Sensor Drive to Workshop" or "Auto Light Inoperative" messages appearing on the instrument cluster.

Introduction

This Genuine used Sunlight and Headlight Sensor Module is an essential replacement for restoring the automated convenience features of your Mercedes Benz. Every unit is harvested from donor vehicles with intact glass and electrical systems to ensure the sensitive photo-diodes have not been compromised by environmental exposure. Our technicians subject these modules to diagnostic testing to confirm they communicate correctly with the Front SAM (Signal Acquisition Module). By choosing a Genuine part, you ensure that the light sensitivity thresholds match your vehicle's factory specifications perfectly.

Product Details

• Brand: Mercedes Benz
• Model Compatibility: W166 M-Class/GLE, W204 C-Class, W212 E-Class
• Part Name: Sunlight and Headlight Sensor Module
• Part Number: A1669007101
• Condition: Genuine Used (Tested Working)
• Notes: This is a high-sensitivity optical component. Please ensure your windshield is clean and free of cracks near the sensor mount for optimal performance after installation.

Frequently Asked Questions

Q: What symptoms indicate failure? A: The most frequent sign is the automatic headlight system becoming unresponsive, often defaulting to keeping the lights on at all times as a safety precaution. You may also notice the air conditioning feels less effective when driving toward the sun.

Q: Does this require coding? A: In the W166, W204, and W212 chassis, this sensor is typically a plug-and-play unit. While it does not usually require SCN coding, it is standard professional practice to clear any "Stored" fault codes in the Front SAM or Overhead Control Panel module to reset the system logic.

Q: Is this original? A: Yes. This is a Genuine Mercedes Benz factory component. Unlike aftermarket light sensors which often have incorrect resistance values and cause flickering or delayed activation, this Genuine part maintains the exact factory-spec reaction times.

Why Choose Us?

• Verified functionality through Mercedes-specific diagnostic equipment.
• Actual photos of the unit provided to ensure the mounting clips are intact.
• 30-day exchange warranty.
• Technical expertise from professional technicians who understand German electrical architecture.

Shipping

Location: Kuala Lumpur, Malaysia Shipping: West Malaysia RM50 (Estimate) / East Malaysia RM80 (Estimate) Delivery: 1-2 working days Packaging: Secure anti-static packaging, heavy-duty shock absorption. (We send actual photos/videos of the unit and packaging before shipping)

Warranty and Return Policy

• 30-day exchange warranty from the date of receipt.
• Proof of professional installation by a qualified workshop is required for warranty claims.
• No returns if the item is opened, modified, tampered with, or damaged due to incorrect electrical wiring.
• Exchange only for confirmed internal electronic defects.

How to Order

1. WhatsApp us to confirm compatibility with your specific VIN.
2. Send your chassis number or a clear photo of your old unit label.
3. Confirm order details and stock availability.
4. Receive actual product photos and diagnostic test confirmation.
5. Make payment via bank transfer.
6. Item is shipped immediately with tracking details provided.

Contact Us

William – https://wa.me/60102992988 Lok – https://wa.me/60177720143

Price Notice

Price is estimated only. Actual price depends on current stock levels, specific part number revisions, and unit condition. Please WhatsApp us for a formal quote.

Compatible Models