Converting a Bobcat S250 Keyless System to a Keyed Ignition with a Broken Screen: A Step-by-Step Guide

[MikePhua]

Bobcat’s S250 skid steer loader is a versatile piece of heavy equipment widely used in construction, landscaping, and other industries. While it comes equipped with a keyless start system for added convenience, there are situations where owners or operators may want to switch to a more traditional keyed ignition system. This conversion can become even more complex if the equipment’s screen is broken, which could otherwise serve as a helpful interface for troubleshooting and system management. This article will explore how to convert a Bobcat S250’s keyless system to a keyed ignition, focusing on the challenges of working with a broken screen.
Understanding the Keyless System on the Bobcat S250
The Bobcat S250, like many modern machines, utilizes a keyless ignition system that requires a user to enter a code or use a fob to start the engine. This system is designed to enhance security, as it makes it harder for thieves to hotwire the equipment. However, keyless systems can pose a few challenges:

1. Lost or Broken Fob: If the fob is lost or damaged, starting the machine can become impossible.
   
2. Screen Malfunctions: The screen, often part of the equipment’s control system, is used for monitoring diagnostics, machine settings, and code entry. When this screen breaks, it can become difficult to troubleshoot or manage the machine.
   
3. Preference for Traditional Systems: Some operators simply prefer the simplicity and reliability of a keyed ignition, which is more straightforward and familiar.
   

In these cases, converting the keyless system to a keyed ignition system may be the preferred solution.
Why Consider Converting to a Keyed System?
While keyless systems offer increased security and convenience, they may not be suitable for every operator or job. Here are some reasons why you might want to make the change:

• Security Concerns: If you are operating in an area where you don’t trust the security of the keyless fob, switching to a keyed system could reduce the risk of unauthorized usage.
  
• Operational Preference: For some operators, a keyed system feels more intuitive, and it can be easier to manage the equipment without needing to memorize or input a code.
  
• Maintenance or Repair: If the keyless ignition system or screen is malfunctioning, and replacement parts are hard to find or too expensive, a keyed system might provide a more cost-effective solution.
  

Challenges of Converting with a Broken Screen
One of the most significant challenges of converting the Bobcat S250’s keyless system to a keyed ignition is the presence of a broken screen. This screen often provides critical information about the system's settings, error codes, and machine health. Without a functional screen, troubleshooting becomes more difficult, and ensuring the conversion is done correctly is a bit trickier.
In a situation where the screen is broken, operators and technicians need to rely on physical connections and wiring to complete the conversion. The process involves bypassing or disconnecting the keyless system and rerouting the ignition components to work with a traditional keyed system.
Step-by-Step Guide to Converting the System
If you're determined to make the switch to a keyed ignition system despite a broken screen, here is a general guide for converting the keyless system on a Bobcat S250.

1. Preparation:
   • Gather Tools and Parts: Before beginning the conversion, ensure you have all necessary tools, such as a wiring diagram, basic hand tools, a new keyed ignition switch, and any replacement parts like wiring connectors or relays.
     
   • Disconnect the Battery: To avoid electrical shorts or shocks, disconnect the battery before beginning any work on the electrical components.
     
2. Locate the Keyless System Components:
   • The keyless system on the Bobcat S250 consists of several components, including the ignition fob receiver, wiring, and the control module. Identify and locate these components, typically found near the operator’s seat or inside the control panel.
     
3. Disconnect the Keyless System:
   • Remove the Fob Receiver: The receiver is the component that communicates with the fob to authenticate the user and allow ignition. Carefully disconnect this part from the wiring harness. In some cases, it may also be necessary to disconnect any associated relays.
     
   • Remove the Control Module: The control module is responsible for processing input from the keyless fob and screen. Disconnect the module, ensuring that you label or document the connections to avoid confusion during the rewiring process.
     
4. Wiring for the Keyed System:
   • Install the Keyed Ignition Switch: Select a keyed ignition switch that is compatible with the Bobcat S250’s electrical system. This ignition switch will need to be wired directly to the system’s ignition relay.
     
   • Wire the Ignition Relay: The ignition relay controls the flow of current to the engine’s starter motor. Wire the new ignition switch to the relay according to the manufacturer’s specifications, ensuring the power flows properly when the key is turned.
     
   • Bypass the Keyless Circuit: You may need to bypass or disconnect the keyless system’s security circuit. This step is crucial because the keyless system sends signals to the engine control unit (ECU) to allow ignition. If the system is still active, the engine may not start.
     
5. Test the New Keyed System:
   • Reconnect the Battery: After completing the wiring work, reconnect the battery and check all electrical connections for any signs of faults or shorts.
     
   • Turn the Key: Turn the ignition key to test whether the machine starts correctly. Check the engine and other systems for proper functionality.
     
6. Reassemble the Control Panel:
   • Once the keyed ignition system is functioning correctly, reassemble the control panel and ensure that any exposed wiring is properly insulated. If necessary, install a new panel or screen to display essential operational information.
     

Troubleshooting Without a Screen
Working with a broken screen presents challenges, especially when troubleshooting any electrical issues. However, a few strategies can help:

• Use a Diagnostic Tool: Even without the screen, you can use a diagnostic tool (OBD-II scanner or a similar tool) to check the machine’s systems for fault codes.
  
• Manual Wiring Checks: If the machine fails to start or encounters issues, manually check all wiring connections and relays. A multi-meter can help you identify any areas where the circuit is incomplete or faulty.
  

Real-World Example: Operator Experiences
In one instance, a contractor who owned a Bobcat S250 with a broken screen chose to convert to a keyed system for simplicity and security. The machine had been experiencing issues with the keyless system, and the operator preferred the reliability of a traditional key-based system. After successfully completing the conversion, the operator reported a significant improvement in reliability, and the machine started more consistently, which improved productivity on the job site.
Another operator shared that, while the conversion was initially challenging due to the lack of a screen, the decision ultimately proved worthwhile. By carefully following the wiring diagram and bypassing the broken screen, they restored full control over the machine with minimal downtime.
Conclusion: Making the Right Choice for Your Bobcat S250
Converting the Bobcat S250 from a keyless system to a keyed ignition is a practical solution for many operators, especially when the keyless system is malfunctioning or difficult to operate. Although the process can be challenging, particularly when working with a broken screen, the benefits of a more straightforward, reliable ignition system can significantly improve the machine’s usability and security.
As with any modification to heavy equipment, it’s essential to carefully follow the necessary steps and ensure compatibility between components. If you’re unsure about the process, consulting a professional or referring to the manufacturer’s guidelines can help ensure a smooth transition to the keyed ignition system.