Envoy 4WD L6-4.2L VIN S (2003)
Accessory Delay Module: Initial Inspection and Diagnostic Overview
Diagnostic Starting Point - Accessory Delay Module
DIAGNOSTIC STARTING POINT - ACCESSORY DELAY MODULE
Begin the system diagnosis with the Diagnostic System Check - Accessory Delay Module. The Diagnostic System Check will provide the following
information:
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Class 2 communication status
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"U" codes which indicate module communication or circuit failure
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"B" codes which indicate a possible body function or circuit failure
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The status of any "U" or "B" codes
Diagnostic System Check - Accessory Delay Module
DIAGNOSTIC SYSTEM CHECK - ACCESSORY POWER MODULE
TEST DESCRIPTION
Steps 1-3
