Diagnostic System Check - Horns

A Diagnostic System Check - Horns:

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
3. The Symptom Table will determine the correct diagnostic procedure to use.
4. 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. At this point you have determined all DTCs applicable to the Horns system. Refer to Symptoms for further Horns diagnosis. Any other codes displayed from the listed modules do not apply to Horns and should be diagnosed in their applicable section.