MERCEDES GLB Towbar Wiring Kits

The MERCEDES GLB is frequently used for towing caravans, trailers and bike carriers. Dedicated towbar wiring kits ensure correct trailer lighting, safe integration with vehicle electronics and reliable operation of assistance systems. On this page you will find model-specific solutions developed for the GLB. For other MERCEDES applications, see the MERCEDES towbar wiring kit range.

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Mercedes GLB Trailer Electrics Compatibility

The available wiring kits are designed for MERCEDES GLB SUV models from 12/2019–present and connect the vehicle to trailer or rear-mounted accessory lighting in a controlled way. Options include both 7-pin and 13-pin sockets, each prepared for permanent power (PA) according to the product data.

When installed correctly, the kits support operation of tail lights, brake lights, indicators and rear fog light on the towed load. The control module communicates with the GLB electronics to detect trailer connection and manage lighting loads within the limits of the vehicle’s electrical system.

Some MERCEDES GLB vehicles are equipped with an OE towbar control module (PR-code 1D7). For these versions, specific wiring kits (VW26813MU and VW26807MU) interface with the factory module rather than adding an additional control unit, maintaining OE diagnostics and control strategies.

Depending on vehicle configuration and workshop equipment, coding or activation via diagnostic tools may be required after installation so that trailer functions, bulb monitoring and stability systems are fully recognised by the onboard electronics.

Vehicle Technology Compatibility

Parking sensors: Dedicated GLB wiring supports correct interaction with rear parking sensors; when the trailer is recognised, the system can reduce or disable acoustic warnings to avoid continuous beeping during manoeuvring.
Trailer Stability Program (TSP): Where fitted, the trailer presence information can be used by the ESP/TSP system to adapt braking and stability control strategies specifically for towing.
Rear fog light deactivation: Many dedicated kits are configured to deactivate or dim the vehicle’s rear fog light when a trailer is connected, reducing glare and ensuring the fog light on the trailer is prioritised.
Check control and bulb monitoring: Integration with the GLB electronics enables correct fault detection for trailer lighting and prevents dashboard warning messages caused by uncontrolled load sensing.
Energy management: The wiring kits are designed to work with the GLB’s modern alternator control and energy management, ensuring trailer lighting loads are correctly balanced without overloading individual circuits.
Vehicles with OE module (PR-code 1D7): Specific variants are available that connect to the existing factory towbar module, preserving MERCEDES diagnostics, coding and safety strategies.

Towbar Wiring Kit Installation Notes For This Model

Model coverage: All listed kits are specified for MERCEDES GLB SUV versions produced from 12/2019 onwards; always confirm production date and equipment level before selection.
Socket configuration: Choose between 7-pin/PA or 13-pin/PA kits according to the intended trailer or caravan use and any need for permanent power feeds.
OE-module vehicles: For GLB models with factory towbar control (PR-code 1D7), use the designated wiring kits that interface with the OE module instead of universal solutions.
Extension components: Certain 13-pin kits may require additional extension parts (such as separate power or charging harnesses) where specified in the product information; ensure these are included during planning.
OEM-style routing: Cable runs should follow MERCEDES harness paths, using existing grommets and fixing points where possible to maintain an OEM-style fit and minimise the risk of damage or water ingress.
Corrosion protection: Seal any body penetrations and protect exposed metal with suitable anti-corrosion products; ensure all connectors are properly locked and weather-protected near the bumper area.
Coding and testing: After installation, perform any required coding with diagnostic equipment and function-test all lighting and warning systems with a trailer test board or suitable load.

Related Mercedes Towbar Wiring Kit Applications

Many MERCEDES components and electrical principles used on the GLB are shared with other models in the range. If you operate multiple vehicles, you may also require dedicated wiring kits for these MERCEDES models:

Frequently Asked Questions About MERCEDES GLB Towbar Wiring Kits

Does a dedicated MERCEDES GLB wiring kit work correctly with the rear parking sensors?
Yes. A model-specific GLB wiring kit is designed to signal trailer connection to the vehicle electronics so that rear parking sensors can be reduced or muted when towing, preventing continuous warnings while reversing with a trailer or bike carrier.

Can I use a 7-pin kit on my MERCEDES GLB if I mainly tow small trailers?
Yes. A 7-pin/PA kit is suitable for many light trailers that only require basic road lighting. If you plan to tow caravans or accessories that need interior power or charging circuits, a 13-pin solution is usually more appropriate.

What is the role of PR-code 1D7 on certain MERCEDES GLB models?
GLB vehicles with PR-code 1D7 have an OE towbar control module installed from the factory. For these vehicles, you should select a wiring kit specifically designed to connect to this module so that all trailer functions, diagnostics and safety systems continue to operate as intended by MERCEDES.

Is coding required after installing a towbar wiring kit on the MERCEDES GLB?
On many GLB variants, diagnostic coding or parameter activation is recommended after installation. This enables trailer recognition, correct bulb failure monitoring and integration with systems such as TSP and parking sensors. The installer should check the vehicle configuration and follow the applicable service procedures.

What should I consider regarding electrical load and towing limits on the MERCEDES GLB?
The wiring kit is engineered for the lighting loads of typical trailers and caravans, but the maximum towing weight and nose load are defined by MERCEDES for each GLB variant. Check the vehicle handbook or VIN plate for exact towing limits before selecting and using a towbar.

The MERCEDES GLB benefits from dedicated towbar wiring that is matched to its electronics, safety systems and production period from 12/2019 onwards. Use this page to compare the available 7-pin and 13-pin solutions for your specific vehicle configuration, and consult your installer or workshop if coding is required. For other MERCEDES vehicles in your fleet, you can explore the full MERCEDES towbar wiring kit catalogue.

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