Diagnostic System Check - Instrument Panel Cluster

A Diagnostic System Check, Instrument Cluster:

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
4. The presence of DTCs which begin with U" indicate some other module is not communicating. The specified procedure will compile all of the available information before the tests are performed.