BMW E84 F01 F07 LCI Start Stop Button CAS Ribbon Cable Wiring Harness 6931920

BMW E84 F01 F07 LCI Start Stop Button CAS Ribbon Cable Wiring Harness is an original electrical installation component designed for BMW models equipped with a comfort engine start system. The integrated Start/Stop button with the CAS wiring harness ensures a secure connection to the control module and stable system operation. This is a practical service solution for users who need a proven component to restore the full functionality of the electronic ignition switch.

Specifications and technical data

• SKU: 6931920
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6931920
• Substitutable numbers: 61136931920, 6931920
• Category: Other Starters, Alternators, ECUs & Wiring

Purpose and function in the vehicle

The described set includes a Start/Stop button with CAS wiring harness, used in selected BMW E84, F01, and F07 models after the facelift (LCI). The component is responsible for transmitting the signal from the button to the vehicle access and start system module, which allows for starting and stopping the engine without a classic mechanical ignition key. The wiring harness is factory-fitted to the electrical architecture of these models, which facilitates installation and reduces the risk of installation errors. As a result, the component can be used both for standard replacement of a damaged button and for CAS system repairs in vehicles after collisions or modifications to the installation.

Set construction and technical aspects

The set combines a Start/Stop button and a dedicated ribbon/wiring harness into one unit, which minimizes the number of connections and intermediate connectors. This design promotes signal stability and improves reliability during long-term operation. The connectors used are factory-matched to the sockets in the BMW installation, which allows for plug-and-play style installation without the need to modify the factory harness. The original design ensures compliance with the electrical parameters specified by the vehicle manufacturer, including current capacity, shielding, and resistance to typical cabin operating conditions (temperature changes, vibrations, humidity). This is especially important for components responsible for starting the engine, where signal stability is crucial for the proper operation of the system.

Benefits of using an original BMW component

Choosing such a component allows you to maintain consistency with the factory electrical architecture of the vehicle. This reduces the risk of errors in control units, dashboard messages, or problems with key recognition. The original button with the harness is designed to work with a specific CAS module, which translates into predictable system behavior after installation. By using a dedicated component, you also facilitate service work – both during installation and subsequent diagnostics. A mechanic or automotive electrician deals with a system consistent with the manufacturer's documentation, which speeds up the localization of potential faults and limits the need for additional installation modifications.

Condition, installation, and service recommendations

The element is offered in used condition, which is a cost-effective solution for users looking for original parts for older BMW generations. Before installation, it is recommended to perform a standard visual inspection of the connectors and wire insulation, as well as to check the correct operation of the button in the vehicle after installation. During installation, it is worth paying attention to the correct routing of the harness in the center console or dashboard, in accordance with the factory wire path. This allows you to avoid chafing, mechanical stress, and unwanted system interference. After connection, it is recommended to perform computer diagnostics to confirm proper communication with the CAS module and the absence of new errors in the control unit memory.

System expansion and related BMW components

If you are planning a comprehensive repair or upgrade of the electrical zone in your BMW and need other elements from the same group, such as additional harnesses, connectors, or control modules, check the available parts in the Other BMW category. For a comparison of solutions used in other premium brands and a better understanding of the differences in the construction of drive systems and the accompanying electronics, it is worth reading an article describing the sports versions of Audi – Audi RS vs other models – what is hidden under the hood and chassis?. This allows you to better assess how manufacturers design modern control systems and what importance original components have in long-term operation.