Test Description

The numbers below refer to the step numbers in the diagnostic test procedure.

4  - Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or GM Lan circuit or due to a total malfunction of the class 2 serial data circuit or GM Lan circuit. The specified procedure will determine the particular condition.

5  - Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or GM Lan circuit or due to a total malfunction of the class 2 serial data circuit or GM Lan circuit. The specified procedure will determine the particular condition.

7  - 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.

8  - 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.