1. Product Overview
The Hella 011988011 HLMP 90MM LED module is designed to function as a Fog Lamp, Daytime Running Light (DRL), and Position Lamp. This unit is suitable for upgrading existing vehicle lighting or as an accessory item. It features a compact design and utilizes LED technology for clear and efficient illumination.

Figure 1: Front view of the Hella 011988011 90MM LED Fog/DRL/Position Lamp.
2. Safety Information
Read all instructions carefully before installation and operation. Failure to follow these instructions may result in damage to the product, vehicle, or personal injury.
- Always disconnect the vehicle's battery before performing any electrical work.
- Ensure proper wiring and connections to prevent short circuits or electrical fires.
- Wear appropriate personal protective equipment, such as safety glasses and gloves, during installation.
- Do not modify the lamp or its components. Unauthorized modifications may void the warranty and compromise safety.
- Ensure the lamp is securely mounted to prevent detachment during vehicle operation.
- Consult a qualified automotive technician if you are unsure about any installation steps.
3. Package Contents
Verify that all items are present in the package:
- Hella 011988011 90MM LED Lamp
- Mounting Instructions
4. Setup and Installation
This section provides general guidelines for installing the Hella 011988011 LED lamp. Refer to the included mounting instructions for detailed, product-specific installation steps and wiring diagrams. Professional installation is recommended.
4.1 Pre-Installation Checks
- Ensure the vehicle's electrical system is compatible with the LED lamp's voltage requirements.
- Identify a suitable mounting location on the vehicle, considering the lamp's dimensions and beam pattern.
- Gather necessary tools, which may include wrenches, screwdrivers, wire strippers, crimpers, and electrical tape.
4.2 Mounting the Lamp
The lamp features a universal fit design. Use the provided mounting instructions and hardware to secure the lamp to the vehicle. Ensure the mounting surface is stable and can support the lamp's weight.

Figure 2: Top view of the lamp showing a width of approximately 73.5mm (2.89 inches).

Figure 3: Side view of the lamp showing a total depth of approximately 90mm (3.5 inches) and a mounting depth of 54mm (2.1 inches).

Figure 4: Rear view of the lamp showing a width of approximately 96mm (3.7 inches) and a height of 117mm (4.6 inches).
4.3 Electrical Connection
Connect the lamp to the vehicle's electrical system according to the wiring diagram provided in the separate mounting instructions. Ensure all connections are secure and properly insulated. The lamp is designed for use as a fog lamp, daytime running light, and position lamp, requiring appropriate connections to the vehicle's respective circuits.

Figure 5: Rear view of the lamp, illustrating the connection points for electrical wiring.
5. Operating Instructions
Once properly installed and wired, the Hella 011988011 LED lamp will operate in conjunction with your vehicle's lighting system. The specific activation of the fog, DRL, and position lamp functions will depend on how they are integrated into your vehicle's electrical system and controlled by the vehicle's switches.
- Fog Lamp Function: Typically activated via the vehicle's fog light switch. Designed to provide improved visibility in conditions of fog, heavy rain, or snow.
- Daytime Running Light (DRL) Function: Often activates automatically when the vehicle is running, providing increased visibility to other road users during daylight hours.
- Position Lamp Function: Provides a low-intensity light to indicate the vehicle's presence and width, usually active with the vehicle's parking lights or headlights.
Refer to your vehicle's owner's manual for specific instructions on operating auxiliary lighting.
6. Maintenance
The Hella 011988011 LED lamp is designed for durability and minimal maintenance. Follow these guidelines to ensure optimal performance and longevity:
- Cleaning: Periodically clean the lens with a soft cloth and mild soap and water. Avoid abrasive cleaners or harsh chemicals that could damage the polycarbonate lens.
- Inspection: Regularly check the lamp for any signs of damage, loose connections, or corrosion. Ensure the mounting hardware remains secure.
- Waterproof Feature: The lamp is designed to be waterproof. However, avoid directing high-pressure water jets directly at the lamp's seals during vehicle washing.
- LED Lifespan: LED lights have a long operational lifespan and typically do not require bulb replacement. If the lamp ceases to function, refer to the troubleshooting section.
7. Troubleshooting
If the Hella 011988011 LED lamp is not functioning as expected, perform the following checks:
- Lamp Not Lighting Up:
- Check all electrical connections for tightness and proper insulation.
- Verify that the vehicle's fuse for the lighting circuit is intact and not blown.
- Ensure the vehicle's battery has sufficient charge and the electrical system is supplying power to the lamp.
- Confirm that the vehicle's light switch (fog, DRL, or position) is in the correct position.
- Dim or Intermittent Light:
- Inspect wiring for corrosion or damage that could impede current flow.
- Check for loose ground connections.
- Ensure the vehicle's voltage is stable and within the lamp's operating range.
- Moisture Inside Lens:
- While the lamp is waterproof, extreme temperature changes can sometimes cause condensation. This usually dissipates on its own.
- If significant water ingress is observed, check for damage to the housing or seals.
If issues persist after performing these checks, contact Hella customer support or a qualified technician.
8. Product Specifications
| Feature | Specification |
|---|---|
| Brand | Hella |
| Model Number | 011988011 |
| Light Source Type | LED |
| Vehicle Service Type | Truck |
| Special Feature | Waterproof |
| Auto Part Position | Rear |
| Lens Color | Clear |
| Lens Material | Polycarbonate |
| Item Dimensions (L x W x H) | 1 x 1 x 1 inches (Note: Physical dimensions from diagrams are approximately 90mm depth, 73.5mm width, 117mm height) |
| Manufacturer Part Number | 011988011 |
| UPC | 760687154648 |
| Automotive Fit Type | Universal Fit |
| Included Components | Lamp, Mounting Instructions |
9. Warranty Information
This Hella product is covered by a 1-year manufacturer's warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage resulting from improper installation, accident, abuse, modification, or normal wear and tear.
For warranty claims, please retain your proof of purchase and contact Hella customer support or the authorized dealer from whom the product was purchased.
10. Customer Support
If you have any questions regarding the installation, operation, or maintenance of your Hella 011988011 HLMP 90MM LED Fog/DRL/Position Lamp, please refer to the following resources:
- Hella Official Website: Visit the official Hella website for product information, FAQs, and contact details.
- Authorized Dealer: Contact the retailer or distributor from whom you purchased the product.
- Professional Automotive Technician: For complex installation or electrical issues, consult a certified automotive professional.