2019 - 2024 Chevrolet Blazer Body Control Module (OEM)

Buying a replacement BCM can be tricky. Here's what to look for:

• Compatibility: Make sure the BCM is compatible with your car's year, make, and model.
• Condition: Check the condition of the BCM. Look for any signs of damage or corrosion.
• Warranty: See if the BCM comes with a warranty. A warranty can protect you if the BCM fails.

Quality indicators:

• Testing: Ask if the BCM has been tested to ensure it's working properly.
• Inspection: Look for signs that the BCM has been inspected for damage.
• Reputation: Buy from a reputable seller with good reviews.

What's typically included:

• The BCM itself.
• Sometimes, installation instructions (but not always).

Replacing a BCM can range from moderately difficult to difficult, depending on your experience.

• Difficulty Level: Moderate to Difficult
• Estimated Time: 1-3 hours

Special tools needed:

• Basic hand tools (sockets, wrenches, screwdrivers)
• Scan tool for clearing codes and programming (may be required)

Critical steps and tips:

1. Disconnect the car's battery before starting.
2. Locate the BCM (usually under the dashboard or in the center console).
3. Disconnect the wiring harness from the old BCM.
4. Remove the old BCM.
5. Install the new BCM.
6. Reconnect the wiring harness.
7. Reconnect the car's battery.
8. Use a scan tool to clear any diagnostic trouble codes (DTCs).
9. You may need to have the new BCM programmed to your car. This often requires a professional.

DIY or Professional Installation?

• If you're comfortable working with car electronics and have the necessary tools, you may be able to replace the BCM yourself. However, programming may require a professional. If you're not experienced, it's best to have a professional install it.

You have a few options when buying a replacement BCM:

• Used OEM: These are original parts taken from other vehicles. They offer a good value because they are genuine factory parts that have been tested and inspected.
• New Aftermarket: These are brand new parts made by third-party manufacturers. They are built to meet the original equipment (OE) specifications.

When replacing a BCM, it's a good idea to check these related parts:

• Fuses: Check all fuses related to the BCM and the systems it controls.
• Wiring Harness: Inspect the wiring harness for any damage or corrosion.
• Relays: Check the relays that control the BCM's circuits.

Replacing these parts can help prevent repeat failures by addressing underlying issues that may have caused the original BCM to fail.

A BCM typically lasts for 7-10 years or more.

Factors that affect longevity:

• Environment: Exposure to moisture, heat, or vibration can shorten the BCM's lifespan.
• Electrical Issues: Power surges or short circuits can damage the BCM.
• Maintenance: Proper car maintenance can help prevent BCM failures.

The price of a replacement BCM can vary depending on the source and condition.

• Used OEM: $50 - $200
• New Aftermarket: $100 - $300

Labor costs for installation can range from $100 to $300, depending on the shop and the complexity of the job. Programming may add to the labor cost.

• Total Job Cost Estimate: $150 - $600 (including parts and labor)

Some 2015-2020 Buick, Cadillac, Chevrolet, and GMC vehicles have known issues with water intrusion affecting the BCM. Check for any signs of water damage near the BCM. Some owners have reported issues with the retained accessory power (RAP) function due to BCM problems. Check for any Technical Service Bulletins (TSBs) related to BCM issues for your specific vehicle.

After installing the new BCM, it's important to verify that it's working properly.

• Check all the systems controlled by the BCM: Make sure the power windows, door locks, interior lights, remote keyless entry, and other accessories are working correctly.
• Listen for any unusual noises: Listen for any clicking or buzzing sounds from the BCM.
• Use a scan tool to check for diagnostic trouble codes (DTCs): Make sure there are no new DTCs related to the BCM.

Q: Will this BCM need to be programmed to my car?
A: Possibly. Some BCMs require programming to match your car's specific settings. Check with a professional mechanic or the seller to confirm.

Q: How do I know if my BCM is really bad, or if it's something else?
A: The best way is to have a professional diagnose the problem. They can use a scan tool to check for codes and test the BCM's functions.

Q: Is it hard to replace a BCM myself?
A: It can be tricky, especially if programming is required. If you're not comfortable working with car electronics, it's best to have a professional do it.

Q: What kind of warranty comes with a used BCM?
A: Warranty coverage varies by seller. Check the seller's warranty policy before you buy.

Q: Where is the BCM located in my car?
A: The location varies, but it's often under the dashboard or in the center console. Consult your car's repair manual for the exact location.

OEM Part Numbers:

• GM: 42454411

Fits Years: 2019 2020 2021 2022 2023 2024