Rise in wiring loom repairs highlights need for smarter technical data access

• Wiring looms now top the list of most repaired parts after collisions, new research shows

• HGS Data offers instant access to wiring diagrams, circuit layouts, and fault diagnostics for over 49,000 vehicle models

• One HGS Data licence supports two users simultaneously, all for a single, transparent monthly fee

Wiring looms are now the most repaired part following a vehicle collision, overtaking bumpers, research from AA Accident Assist shows. The shift highlights the growing complexity of modern vehicle repairs, where access to detailed wiring diagrams and accurate repair data is now essential for workshops.

“HGS Data from Hella Gutmann is designed to meet precisely this need,” said Julian Goulding, Head of Garage Equipment at Hella Gutmann. “It’s an online platform that gives workshops comprehensive access to repair data across more than 49,000 vehicle models, including full wiring diagrams, circuit layouts, service schedules, and fault diagnostics.”

According to the analysis of over 14,500 vehicle repairs in 2024/25, 99 per cent required replacement wiring looms.

With vehicles now increasingly equipped with advanced technologies such as parking sensors, rearview cameras, and adaptive cruise control, electrical components are now more often damaged in collisions than traditional body panels. It underscores the rising complexity of vehicle repairs and the critical need for workshops to have access to detailed wiring diagrams and precise repair data.

Technicians using HGS Data can quickly drill down into part-specific information via interactive circuit diagrams, making fault-finding more efficient and repairs more precise.

The platform draws on hundreds of thousands of real-world workshop cases, offering in-depth coverage of all key vehicle systems: from engine control and cooling to brakes, wheel alignment, torque settings, and timing belts.

A built-in diagnostic database provides step-by-step fault resolution based on symptoms, while direct access to Hella Gutmann’s technical call centre ensures expert support is always available when needed.

The system also tracks manufacturer recalls from the past 18 months, allowing garages to keep customers informed of unresolved safety issues.

“To make life easier for busy workshops, we’ve designed the HGS Data licence to be as practical and cost-effective as possible,” said Julian. “With just one licence, two users can access the full range of technical data simultaneously, all for one clear monthly fee, with no hidden extras.”