Fixing Missing R129 Model in HHT-WIN for Mercedes Diagnosis

Hht-win, a crucial component of the Mercedes-Benz Star Diagnostic System (SDS), allows technicians to diagnose vehicle issues. However, some users encounter a problem where the R129 model (typically found in older SL-Class vehicles) doesn’t appear in the model selection list. This article provides a comprehensive guide on how to resolve this issue and ensure proper diagnosis using HHT-WIN.

Identifying the Problem: Missing R129 in HHT-WIN

When using HHT-WIN with a Mercedes-Benz Star C3 system, the R129 model might not be displayed in the vehicle selection menu. This can prevent users from diagnosing issues specific to the R129 chassis. The issue stems from how HHT-WIN accesses vehicle model data.

Solution: Adding the R129 Model to HHT-WIN

The solution involves modifying the HHT-WIN shortcut to include a specific command-line argument that forces the inclusion of the R129 model. Here’s a step-by-step guide:

1. Locate the HHT-WIN Executable:

   • The HHT-WIN executable (HHTPKW.EXE) is usually located in C:Program FilesMercedes-BenzHHTPKW. However, it might be in a different location depending on your SDS installation. The easiest way to locate it is by right-clicking the existing HHT-WIN shortcut and selecting “Open File Location.”

2. Create a Shortcut: Right-click on HHTPKW.EXE and select “Create shortcut.” Move the shortcut to your desktop for easy access.

3. Modify Shortcut Properties:

   • Right-click the new shortcut and select “Properties.”
   • In the “Target” field, add -b129 to the very end of the existing text, ensuring there’s a space before -b129. For example: "C:Program FilesMercedes-BenzHHTPKWHHTPKW.EXE" -b129
   • Important: Ensure the entire path is enclosed in quotation marks, especially if the path contains spaces.

4. Apply Changes: Click “Apply” and then “OK” to save the changes.

Verifying the Fix and Additional Tips

Launch HHT-WIN using the modified shortcut. The R129 model should now appear in the model selection list. You can use this same method to add other missing models, such as the W140 (S-Class), by using -b140 instead of -b129.

While HHT-WIN works with older MB Star C3 systems using an RS232 connection, consider using a more modern setup like the MB SD Connect C4 with XENTRY diagnostics for broader model compatibility and access to newer vehicle features. If you are still experiencing issues, you might consider downloading a pre-modified version of HHT-WIN that includes the R129. However, ensure the source is reputable and the software version is compatible with your hardware. Always test any downloaded software in a safe environment before using it on a vehicle.