1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your Westfalia Complete Vertical Towbar system, including the universal 13-pin electric harness. This product is specifically designed for the Mercedes-Benz CLA Shooting Brake X117 Estate models manufactured between April 2013 and June 2018.
Please read this manual thoroughly before attempting installation or use. Proper installation and adherence to safety guidelines are crucial for safe and reliable operation.
2. Safety Information
- Installation should only be performed by qualified personnel or a certified workshop.
- Always wear appropriate personal protective equipment (PPE) during installation.
- Ensure the vehicle is securely supported on a level surface before beginning work.
- Disconnect the vehicle's battery before performing any electrical work.
- Refer to your vehicle's owner's manual for specific towing capacities and guidelines.
- Regularly inspect the towbar and electrical connections for wear, damage, or corrosion.
- Do not exceed the maximum permissible towing load or vertical load specified for your vehicle and towbar.
3. Package Contents
Verify that all components listed below are present and undamaged before proceeding with installation.
Image: All components of the Westfalia vertical towbar system, including the main towbar frame, detachable towball, electrical harness, and various fasteners.
- Westfalia Vertical Towbar Frame
- Detachable Towball Mechanism
- Universal 13-pin Electric Harness Kit (Quasar Electronics WH2S module)
- Mounting Hardware (bolts, nuts, washers)
- Towball Cover
- Instruction Manuals (for towbar and electrical kit)
Image: Detailed view of the 13-pin electrical harness components, including wiring, connectors, control module, and mounting accessories.
4. Setup and Installation
4.1 Mechanical Towbar Installation
The installation of the towbar frame requires specific tools and knowledge of vehicle underbody components. It typically involves removing the rear bumper, attaching the towbar frame to the vehicle's chassis, and then reassembling the bumper. Refer to the detailed diagrams and instructions provided with the physical product for precise steps.
Image: Technical line drawing illustrating the structural components and mounting points of the Westfalia vertical towbar assembly.
4.2 Electrical Harness Installation
The universal 13-pin electric harness connects the towbar's electrical socket to the vehicle's electrical system. This typically involves routing wires, connecting to the vehicle's rear lights, and installing a control module (e.g., Quasar Electronics WH2S) to manage trailer lighting functions and prevent vehicle error messages.
- Identify appropriate connection points for tail lights, brake lights, indicators, and reverse lights according to the vehicle's wiring diagram.
- Mount the control module in a dry, protected area within the vehicle's boot or side panel.
- Route the main power supply cable from the vehicle battery to the control module, ensuring it is fused correctly.
- Install the 13-pin socket near the towbar, ensuring it is securely fastened and protected from elements.
Image: Close-up view of the 13-pin electrical socket, showing the internal pin configuration and protective cover.
After installation, test all trailer lighting functions (indicators, brake lights, tail lights, reverse light, fog light) with a suitable trailer or test board.
5. Operating Instructions
5.1 Attaching the Detachable Towball
- Ensure the towbar receiver is clean and free of debris.
- Insert the detachable towball into the receiver mechanism.
- Push firmly until it clicks into place. A visual indicator (e.g., green marking) should confirm secure locking.
- Lock the towball with the provided key to prevent accidental detachment and theft.
Image: Close-up of the Westfalia detachable towball mechanism, showing the locking system and release handle.
5.2 Detaching the Towball
- Unlock the towball using the key.
- Follow the specific release procedure for your Westfalia model (usually involves pulling a lever or turning a knob).
- Remove the towball from the receiver.
- Store the towball in its protective bag in a secure location within the vehicle.
5.3 Connecting the Trailer Electricals
Plug the trailer's 13-pin connector firmly into the vehicle's 13-pin socket. Ensure a secure connection. Verify all trailer lights are functioning correctly before driving.
6. Maintenance
- Regular Cleaning: Keep the towbar mechanism and electrical socket clean from dirt, salt, and debris.
- Lubrication: Periodically lubricate moving parts of the detachable towball mechanism according to Westfalia's recommendations (e.g., with grease or spray lubricant).
- Inspection: Before each towing operation, inspect the towbar for any signs of damage, cracks, excessive wear, or corrosion. Check the security of all bolts and electrical connections.
- Electrical Contacts: Ensure the pins in the 13-pin socket are clean and free from corrosion to maintain good electrical contact.
- Storage: When not in use, remove the detachable towball and store it in its protective bag to prevent damage and keep it clean.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Towball does not lock securely | Debris in receiver, mechanism not fully engaged, damaged mechanism | Clean receiver, ensure firm insertion, inspect for damage. Consult a specialist if problem persists. |
| Trailer lights not working | Loose electrical connection, blown fuse, faulty trailer wiring, issue with vehicle's electrical system/module | Check connections, inspect fuses (vehicle and harness), test trailer lights independently, consult an auto electrician. |
| Vehicle error message after installation | Incorrect electrical harness installation, incompatible module, vehicle's CAN-bus system detection | Verify all electrical connections, ensure correct module installation. A diagnostic scan may be required to clear codes or confirm proper communication. |
8. Specifications
- Product Model: 313503600001@WH2SG13
- Towbar Type: Vertical Detachable
- Vehicle Compatibility: Mercedes-Benz CLA Shooting Brake X117 Estate (04/2013-06/2018)
- Electrical System: Universal 13-pin (with Quasar Electronics WH2S module)
- Manufacturer: Westfalia
- ASIN: B09Q3JXNPJ
9. Warranty and Support
For warranty claims, technical support, or further assistance, please contact your Westfalia dealer or the point of purchase. Keep your proof of purchase and product model number (313503600001@WH2SG13) readily available when contacting support.
