Service function guideHybrid Warning Light Diagnosis

This guide equips professional technicians and advanced DIYers with a structured, safety-first method for diagnosing hybrid system warning lights across a wide range of makes and models. It explains how high-voltage hybrid systems operate, why warnings appear, and how to prepare the vehicle and yourself before any testing begins. The step-by-step procedure covers initial scan, live data review, insulation and continuity checks, and component-level verification without relying on model-specific figures. By the end, you will be able to interpret hybrid warnings confidently, isolate faults to the correct subsystem, and document a repair path that protects both the vehicle and the person working on it.