Diagnostic System Check

DIAGNOSTIC SYSTEM CHECK - RADIO, STEREO, AND COMPACT DISC

TEST DESCRIPTION

Steps 1-6:

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. Uses the scan tool to determine if there are any codes in the Radio module.
5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
6. The presence of DTCs that begin with the letter "B" indicates an issue with a module that communicates with BCM.