Yukon/Denali XL 1500 4WD V8-6.0L VIN U (2004)
Accessory Delay Module: Initial Inspection and Diagnostic Overview
Diagnostic Starting Point
DIAGNOSTIC STARTING POINT
Begin the system diagnosis with the Diagnostic System Check - Accessory Delay Module. The diagnostic system check will provide the following
The identification of the control modules which command the system
The ability of the control modules to communicate through the serial data circuit
The identification of any stored diagnostic trouble codes DTCs and their status
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
Diagnostic System Check
DIAGNOSTIC SYSTEM CHECK
The numbers below refer to the step numbers on the diagnostic table.