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.
2000 Chevrolet Blazer 4D Utility, RWDFACTORY OEM SERVICE PROCEDURE
Scan Tool Inoperative
- Check for battery voltage at DLC terminal No. 16 (Orange wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open, blown fuse or short to ground as necessary. After repair, go to BODY CONTROL MODULE (BCM) DIAGNOSTIC SYSTEM CHECK .
- Check for open circuit between DLC terminal No. 4 (Black/White wire) and ground. If no problem is found, go to next step. If problem is found, repair open or high resistance between DLC and ground. After repair, go to BODY CONTROL MODULE (BCM) DIAGNOSTIC SYSTEM CHECK .
- Check for damage and poor connections on DLC terminals No. 4 and No. 16. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, go to BODY CONTROL MODULE (BCM) DIAGNOSTIC SYSTEM CHECK .
- Check scan tool. Follow scan tool manufacturer's instructions. After repair, go to BODY CONTROL MODULE (BCM) DIAGNOSTIC SYSTEM CHECK .
Factory Service Tools
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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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