5130, 5130B and 5230 Excavators, 784B, 785B, 785C, 789B, 789C, 793B and 793C Off-Highway Truck/Tractors and 992G, 994 and 994D Wheel Loaders Vital Information Management System (VIMS) Caterpillar

Note: The harness code is similar to the personality module identification code. Both terms are used to describe the particular interface module that is sending information to the VIMS main module. The harness code is the status (open or ground) of the harness code inputs. The module identifier is the number that is assigned to a particular harness code for a particular electronic control module. Each module has a specific harness code. Therefore, each module also has a specific module identifier. The correct harness code is given in the Electrical System Schematic.

This failure is recorded when the module code circuits change during normal operation.

In order to perform this procedure, the specified harness code for each module must be known. The “Harness Code Troubleshooting” table above lists the specified harness code for VIMS modules.

1. CHECK THE HARNESS CODE.

   1. Turn the disconnect switch and the key start switch to the OFF position.

   2. Disconnect the machine harness from the VIMS module.

   3. At the machine harness connector for the VIMS module, check for continuity between the contacts of the harness code connector and contact 2 (ground). The machine's Electrical System Schematic or the “Harness Code Troubleshooting table” should be used to determine the configuration of the harness code contacts (grounded or open).

      Expected Results:

      Results: The harness code is correct.

      • OK - Harness code is correct. No defect was found in the circuits of the harness code. Reconnect the harness connectors. The problem is intermittent or the module is faulty. STOP.

      • NOT OK - Harness code is not correct. Repair the harness code circuits or replace the harness. STOP.