Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pretest Inspection
Before proceeding with diagnosis, the following precautions must be followed:
- Ensure self-diagnostic tests apply to vehicle being tested. See BODY CONTROL COMPUTER TESTS DIRECTORY table.
- Vehicle must have a fully charged battery and functional charging system.
- Always start at TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS . 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.
- VEHICLE COMMUNICATIONS should only be used when instructed to do so by another test. Always start at TEST 1A.
- Turn ignition switch to OFF position before disconnecting or connecting components.
- 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 DRB after use.
- Always disconnect DRB before charging battery.
- Always perform TEST VER-1 after repairs are made.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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