Body and chassis controllers are an essential part of modern diesel vehicles. They control a wide range of functions, such as braking, steering, suspension, hydraulic power take off units, lighting, HVAC and many others. However, these controllers can also be a source of problems. If a body or chassis controller malfunctions, it can lead to a variety of drivability problems, such as poor handling, erratic braking, and excessive wear on tires.

To diagnose problems with body and chassis controllers, technicians need to have access to the right diagnostic tools. These tools can be used to read and clear fault codes, view live data, and perform tests on the controllers.

The specific diagnostic requirements for body and chassis controllers vary depending on the vehicle manufacturer. However, there are some general requirements that all technicians should be aware of.

  • Access to diagnostic tools: Technicians need to have access to diagnostic tools that are compatible with the vehicle they are working on. These tools can be purchased from the vehicle manufacturer or from a third-party supplier.
  • The ability to read and interpret fault codes: Technicians need to be able to read and interpret fault codes to diagnose problems with body and chassis controllers. Fault codes can provide valuable information about the problem, such as the location of the problem and the type of problem.
  • Knowledge of the vehicle’s electrical system: Technicians need to have access to troubleshooting and repair information, circuit diagrams, fuse box connections, and tools like multimeters to properly understand the vehicle’s electrical system in order to diagnose problems with body and chassis controllers. This includes understanding the different types of connectors, the different types of power supply, and the different types of controllers.
  • The ability to view live data: Technicians can use live data to monitor the performance of body and chassis controllers. This can help them to identify problems that are not generating fault codes.
  • The ability to perform tests on controllers: Technicians can use tests to verify the functionality of body and chassis controllers. This can help them to determine if the controller is the source of the problem.

By following these requirements, technicians can effectively diagnose problems with body and chassis controllers. This can help them to repair the problem and get the vehicle back on the road.

Here are some additional tips for diagnosing problems with body and chassis controllers:

  • Start with the basics: Before you start using diagnostic tools, it is important to start with the basics. Check for loose or damaged connectors, and make sure that the wiring is in good condition.
  • Use the right tools: Make sure that you are using the right diagnostic tools for the job. Using the wrong tools can damage the controller or give you inaccurate results.
  • Be patient: Troubleshooting problems with body and chassis controllers can be time-consuming. Be patient and don’t give up until you have found the problem

Triad offers the best information in the industry for troubleshooting and repairing body and chassis controller systems. Jaltest Commercial Vehicle Software & Adapter Kit includes Info Online which provides full troubleshooting steps and repair information, technical specifications and much more. Info Online is integrated directly into Jaltest software with an internet connection and provides all necessary repair information for engines, ABS, transmissions and body and chassis controllers.
Jaltest also offers Info Web for any customer who would like to access this information outside of Jaltest software via an online portal.

Contact Triad Diagnostic Solutions for more information at 317-939-3690 or email us at