1. Product Overview
The DNA Motoring TWM-015-T888-BK-SM towing mirrors are designed as direct replacements for factory mirrors, offering enhanced visibility and features for vehicles requiring extended rear view, especially when towing. These mirrors integrate powered adjustment, heating for defrost, manual telescoping, and built-in turn signals.

Image 1.1: DNA Motoring TWM-015-T888-BK-SM Towing Mirrors, showing the overall design.
Key Features:
- Powered Adjustment: Allows for convenient adjustment of the mirror glass from inside the vehicle.
- Manual Telescoping Function: Extends the mirror housing outwards for wider rear visibility when towing.
- Heating Element: Integrated defrost function to clear ice and fog from the mirror surface.
- Built-in Turn Signal Light: Enhances safety by providing clear indication of turns or lane changes.
- Reinforcement Brackets: Designed to minimize vibration during vehicle operation.
- Durable Construction: Black housing with a rugged texture and smoke signal lens.
Vehicle Compatibility:
These towing mirrors are compatible with the following vehicle models:
- 2003-2006 Chevrolet Silverado
- 2007 Chevrolet Silverado Classic
- 2003-2006 Chevrolet Suburban
- 2003-2006 Chevrolet Avalanche
- 2003-2006 Chevrolet Tahoe
- 2003-2006 GMC Sierra
- 2007 GMC Sierra Classic
- 2003-2006 GMC Yukon
- 2003-2006 Cadillac Escalade
Note: Ensure your vehicle has matching functions for the mirrors (e.g., powered adjustment, heating, turn signals) for full compatibility.
2. Installation Instructions
Professional installation is highly recommended for these towing mirrors. The installation process generally involves replacing the existing factory mirrors with the new units. Ensure all electrical connections are properly made for full functionality.
Required Tools (Not Included):
- Basic hand tools (e.g., screwdrivers, socket set) for removing and installing mirrors.
- Wire strippers/crimpers (if custom wiring is needed for specific functions).
Installation Steps:
- Preparation: Park the vehicle on a level surface and engage the parking brake. Disconnect the negative terminal of the vehicle's battery to prevent electrical shorts.
- Remove Old Mirrors: Carefully remove the interior door panel to access the mirror mounting bolts and electrical connector. Disconnect the electrical connector and unbolt the old mirror assembly from the door frame.
- Install New Mirrors: Position the new DNA Motoring towing mirror assembly onto the door frame. Secure it with the provided hardware.
- Connect Wiring: Connect the electrical plug of the new mirror to the vehicle's wiring harness. Ensure a secure connection. If additional wiring is required for specific functions (e.g., puddle lights, if applicable and not plug-and-play), follow the vehicle's wiring diagrams or consult a professional.
- Test Functions: Reconnect the vehicle's battery. Test all mirror functions: powered adjustment, heating, turn signals, and any other integrated features.
- Reassemble: Once all functions are verified, reattach the interior door panel.

Image 2.1: Close-up of mirror wiring harness and mounting points, showing the electrical connector and studs for attachment.
3. Operating Instructions
3.1. Powered Mirror Adjustment
Use the vehicle's factory mirror control switch located on the driver's side door panel to adjust the main mirror glass. Select the left or right mirror, then use the directional pad to position the mirror for optimal rear visibility.

Image 3.1: Icons indicating power mirror adjustment, manual folding, and heated function.
3.2. Manual Telescoping Function
To extend the mirrors for towing, grasp the mirror housing firmly and pull it outwards from the vehicle. To retract, push the mirror housing back towards the vehicle until it locks into its standard position. This function provides an extended field of view for trailers.

Image 3.2: Illustration of the manual telescoping feature, showing the mirror extending and retracting.
3.3. Heated Mirror (Defrost)
The heated mirror function is typically activated via a button on your vehicle's dashboard, often integrated with the rear defroster control. When activated, the heating element within the mirror glass will warm up to clear frost, ice, or fog.

Image 3.3: Close-up of the mirror glass showing the heated mirror symbol.
3.4. Turn Signal Lights
The integrated turn signal lights will illuminate in conjunction with your vehicle's turn signals, providing additional visibility to other drivers when you are making a turn or changing lanes.

Image 3.4: Detail of the illuminated amber turn signal lights on the mirror housing.
4. Maintenance
Regular maintenance ensures optimal performance and longevity of your towing mirrors.
- Cleaning: Clean the mirror glass and housing regularly with a mild automotive glass cleaner and a soft cloth. Avoid abrasive cleaners or harsh chemicals that could damage the mirror surface or housing finish.
- Inspection: Periodically inspect the mirrors for any signs of damage, loose components, or wiring issues. Ensure the telescoping mechanism operates smoothly.
- Electrical Connections: Check electrical connections for corrosion or looseness, especially after driving in harsh weather conditions.
5. Troubleshooting
If you encounter issues with your towing mirrors, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| Mirror glass does not adjust electrically. |
|
|
| Heated mirror function is not working. |
|
|
| Turn signal lights do not illuminate. |
|
|
| Excessive vibration during driving. |
|
|
| Mirror image appears warped or distorted. |
|
|
| Mirror adjustment range is limited. |
|
|
6. Specifications
| Feature | Detail |
|---|---|
| Model Number | TWM-015-T888-BK-SM |
| Brand | DNA MOTORING |
| Auto Part Position | Rear (Side Mirrors) |
| Material | Glass (Mirror), Plastic (Housing) |
| Vehicle Service Type | Car, Truck |
| Color | Black Housing, Smoke Signal Lens |
| Mounting Type | Door Mount |
| Special Feature | Manual Telescoping, Powered Adjustment, Heated, Turn Signal |
| Item Weight | 8.98 Kilograms (Pair) |
| Fit Type | Vehicle Specific Fit |
| Operation Mode | Power |
| Lens Curvature | Convex |
| Included Components | 1 Pair of Mirrors (Left & Right), Hardware as Shown |
| GTIN/UPC | 842765149071 |
7. Warranty and Support
7.1. Manufacturer Warranty
For warranty information regarding this product, please contact the seller directly. Warranty terms and conditions may vary.
7.2. Customer Support
If you have any questions, require technical assistance, or need to report an issue, please contact DNA Motoring customer support or the retailer from whom you purchased the product. Provide your model number (TWM-015-T888-BK-SM) and purchase details for faster service.