MERCEDES GLS Towbar Wiring Kits

The Mercedes GLS is frequently used for towing caravans, trailers and bike carriers. Dedicated towbar wiring kits ensure correct trailer lighting and safe integration with the GLS electrical architecture from 04/2016 onwards. For other Mercedes models, see the Mercedes towbar wiring kits overview.

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Mercedes GLS Trailer Electrics Compatibility

Dedicated wiring kits for the Mercedes GLS are designed for models built from 04/2016, with separate solutions for vehicles up to 10/2019 and from 11/2019 onwards. This ensures correct compatibility with the GLS body control modules and CAN-bus systems.

The available GLS kits use 7-pin and 13-pin trailer sockets, including variants with permanent live and ignition-switched power (PA) on post-11/2019 vehicles. This supports common trailer, caravan and rear-mounted carrier lighting configurations in line with European standards.

Correct operation of indicators, brake lights, tail lights and rear fog lights on the trailer is managed via vehicle-specific connections, so the GLS can monitor trailer lighting loads and react appropriately in the event of a failure.

On many GLS models, coding or activation via diagnostic equipment may be required after installation so that trailer functions are recognised by the vehicle electronics, particularly for check control messages and stability systems.

Vehicle Technology Compatibility

Integration with factory parking sensors so that rear acoustic warnings can be adapted or suppressed when a trailer is detected, where the vehicle supports this function.
Support for Trailer Stability Program (TSP) and other ESP-based trailer functions on compatible GLS models by providing the correct trailer detection signal to the control units.
Rear fog light deactivation on the vehicle side, where supported, to prevent glare from reflecting off a trailer or caravan while maintaining trailer fog light operation.
Compatibility with the GLS check control system so that trailer indicator failure can be detected and reported via the instrument cluster where the vehicle offers this feature.
Electrical design suitable for modern GLS engines and drive systems, including vehicles with advanced alternator control and energy management; always follow vehicle-specific wiring and coding instructions.

Towbar Wiring Kit Installation Notes For The Mercedes GLS

Use a vehicle-specific wiring kit for GLS models from 04/2016, observing the distinction between 03/2016–10/2019 and 11/2019–onwards production periods.
Select 7-pin or 13-pin (with or without permanent/ignition feed) depending on the intended trailer or caravan equipment and national requirements.
Maintain OEM-style fit and corrosion protection by routing cables along original paths, using existing grommets where possible and sealing any required apertures.
Disconnect the battery according to Mercedes guidelines before working on the GLS electrical system, particularly around airbag and power management circuits.
After installation, perform coding or vehicle configuration where specified in the fitting instructions so that trailer detection, lighting monitoring and stability functions operate correctly.
Check the vehicle handbook or VIN plate for exact towing limits and nose weight before connecting any trailer or caravan.

Related Mercedes Towbar Wiring Kit Applications

Many electrical principles used on the Mercedes GLS are shared with other Mercedes saloon and SUV models. If you operate multiple vehicles, you may also require dedicated wiring solutions for these models:

Frequently asked questions about MERCEDES GLS towbar wiring kits

Do Mercedes GLS towbar wiring kits work with factory parking sensors?
The dedicated GLS wiring kits are designed to communicate with the vehicle electronics so that, where supported by the specific GLS variant and coding, rear parking sensors can be adapted or muted when a trailer is detected.

Should I choose a 7-pin or 13-pin socket for my Mercedes GLS?
Use a 7-pin socket for basic trailer lighting and many bike carriers. Choose a 13-pin socket if you tow caravans or trailers requiring additional functions such as interior power feeds or fridge circuits, or where national regulations specify 13-pin connections.

Is coding required after installing a towbar wiring kit on the Mercedes GLS?
On many GLS models, diagnostic coding or activation is required so the vehicle recognises the trailer module, enables Trailer Stability Program where available and correctly monitors trailer lighting. Always follow the instructions supplied with the vehicle-specific kit.

Are these wiring kits suitable for all Mercedes GLS production years?
No. GLS models from 04/2016 to 10/2019 use different wiring solutions from vehicles produced from 11/2019 onwards. Always select a kit that explicitly matches the production period of your GLS.

Can I install a GLS towbar wiring kit myself?
Installation typically involves interior trim removal, access to the rear lighting and connection to the GLS CAN-bus or control units, followed by possible coding. Skilled DIY installers can fit the kit, but professional installation is recommended if you are not familiar with Mercedes electrical systems.

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