gauges not working

Customer Concern: The dash gauges are not working. Tests/Procedures: 1. Check to see if the instrument cluster will perform the self test. Begin with the ignition switch in the Lock position. Hold down the trip reset button until the word "Sof" and a number appear in the odometer window. If the cluster will not self test, then it is a possible cluster failure. 2. Using a compatible scan tool, try to communicate with all the modules on the vehicle to see which ones are working and which ones are not. 3. If unable to communicate with any modules, start unplugging one at a time until the communication comes back. The module that is disconnected last is taking down the bus circuit. Replace that module. Potential Causes: Malfunctioning Bus Cluster Assy Module