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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Body Control Modules) >> Diagnostic Tests >> DTC U1000 Or U1255: Class 2 Communication Malfunction >> Diagnostic Aids

Diagnostic Aids

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When a malfunction (such as an open fuse to a module) occurs while modules are communicating, a loss of communication DTC is set as current. When modules stop communicating (ignition is turned off), the current loss of communication DTC is cleared but the history DTC remains. When the modules begin to communicate again, the module with the blown fuse will not be learned by the other modules, so DTC U1000 or U1255 is set as current by the other modules. If the malfunction occurs while the modules are not communicating, only DTC U1000 or U1255 is set.

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