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
Body Control Module (BCM) Diagnostic System Check
CAUTION:
BCM Brown 24-pin connector C1 contains power and ground sources. When removing BCM, always disconnect connector C1 first before disconnecting connectors C2 and C3. When installing BCM, always reconnect connectors C2 and C3, then connector C1 last.
- Install scan tool. If scan tool works, go to next step. If scan tool does not work, go to SCAN TOOL INOPERATIVE .
- Turn ignition on. Attempt to communicate with BCM. If BCM communicates with scan tool, go to next step. If BCM does not communicate with scan tool, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE .
- Check BCM DTCs. If any "U" prefix codes exist, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE . If no "U" prefix codes exist, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS table.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.