K 2500 Yukon 4WD V8-6.0L VIN U (2000)
Body Control Module: Initial Inspection and Diagnostic Overview
A Diagnostic Starting Point - Body Control System
Begin the diagnosis of the body control system by performing the Diagnostic System Check for the system in which the customer concern is apparent.
The Diagnostic System Check will direct you to the correct procedure for diagnosing the system and where the procedure is located. Refer to A
Diagnostic System Check - Body Control System.
A Diagnostic System Check - Body Control System
A Diagnostic System Check - Body Control System
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 or due to a total malfunction of the class 2 serial data
circuit. The specified procedure will determine the particular condition.
3. This step is checking for DTCs in the body control module.
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.
