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z 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 DIAGNOSTIC SYSTEM CHECK - RETAINED ACCESSORY POWER Test Description 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 3: This step tests for valid system power moding in all ignition switch positions. 5: The presence of DTCs which begin with "U" indicate some other module is not communicating. The Diagnostic System Check - Retained Accessory Power Step Action Yes No Schematic Reference:Data Link Connector (DLC) Schematics in Data Link Communications 1 Install a scan tool. Go to Step 2 Go to Scan Tool Does Not Power Up in Data Link Communications 2 1. Turn ON the ignition, with the engine OFF. 2. Attempt to establish communication with the body control module. Does the scan tool communicate with the Go to Step 3 Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications 3 1. Access the class 2 power mode IMPORTANT: Open the driver door and leave it open IMPORTANT: The engine may start during the
2004 Hummer H2 2004 ACCESSORIES & EQUIPMENT Retained Accessory Power - Hummer H2
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