A wiring test method for high speed data communications in vehicles, which makes use of a wiring test device that comprises: - a workbench, - counterparts, arranged on the workbench, comprising the counterparts connectors, adapted to be connected to both ends of one or more wires to be analysed, - a wire electrification module, linked to the connectors, adapted to inject a high frequency signal in the wires, - a data measurement and processing module, linked to the connectors, adapted to pick up the high frequency signal that circulates through the wires, - a power supply module for the measurement and processing module and for the electrification module, and - a data display module, linked to the measurement and processing module, being the method characterized in that it comprises the steps of: - connecting one or more wires to be analysed to the connectors of the counterparts, - verifying the correct connection of the wires to the connectors arranged on the workbench, - injecting the high frequency signal in the wires with the electrification module, - reading the high frequency signal once it has passed through the wires with the measurement and processing module, - determining one or more of the following parameters: ∘ distance to a preset insertion loss limit, ∘ distance to a preset return loss limit, ∘ distance to a preset longitudinal conversion loss limit, ∘ distance to a preset longitudinal conversion transfer loss (LCTL) limit, ∘ absolute value of the time domain reflectometry impedance (TDR Z), ∘ characteristic impedance differential mode (CIDM), - sending, to the display module, the parameters obtained. - a workbench, - counterparts, arranged on the workbench, comprising the counterparts connectors, adapted to be connected to both ends of one or more wires to be analysed, - a wire electrification module, linked to the connectors, adapted to inject a high frequency signal in the wires, - a data measurement and processing module, linked to the connectors, adapted to pick up the high frequency signal that circulates through the wires, - a power supply module for the measurement and processing module and for the electrification module, and - a data display module, linked to the measurement and processing module, - connecting one or more wires to be analysed to the connectors of the counterparts, - verifying the correct connection of the wires to the connectors arranged on the workbench, - injecting the high frequency signal in the wires with the electrification module, - reading the high frequency signal once it has passed through the wires with the measurement and processing module, - determining one or more of the following parameters: ∘ distance to a preset insertion loss limit, ∘ distance to a preset return loss limit, ∘ distance to a preset longitudinal conversion loss limit, ∘ distance to a preset longitudinal conversion transfer loss (LCTL) limit, ∘ absolute value of the time domain reflectometry impedance (TDR Z), ∘ characteristic impedance differential mode (CIDM), ∘ distance to a preset insertion loss limit, ∘ distance to a preset return loss limit, ∘ distance to a preset longitudinal conversion loss limit, ∘ distance to a preset longitudinal conversion transfer loss (LCTL) limit, ∘ absolute value of the time domain reflectometry impedance (TDR Z), ∘ characteristic impedance differential mode (CIDM), - sending, to the display module, the parameters obtained.