Pretest Inspection

Before proceeding with diagnosis, the following precautions must be followed:

• Vehicle must have a fully charged battery and functional charging system.
• Always start at TEST 1A. Starting with any other test may result in incorrect results.
• Only perform test steps indicated. It is NOT necessary to perform all steps in a test.
• BODY CONTROL COMPUTER - VEHICLE COMMUNICATIONS tests should only be used when instructed to do so by another test. Always start at TEST 1A .
• Always perform VERIFICATION TEST after repairs are completed.
• Turn ignition switch to OFF position before disconnecting or connecting module connector.
• At end of each test step, reconnect all wires and install any components removed for testing.
• Use extreme care when connecting or disconnecting wiring during testing to prevent accidental grounding or shorting.
• DO NOT  use a test light in place of a voltmeter.
• Always disconnect scan tool after use.
• Always disconnect scan tool before charging battery.