Here's a breakdown of troubleshooting and potential repairs:
1. Diagnose the Problem:
* Interior handle doesn't work: The problem is likely within the interior handle mechanism itself, the linkage connecting it to the latch, or a broken cable.
* Exterior handle doesn't work: The issue could be in the exterior handle mechanism, its linkage, or a broken cable.
* Power lock doesn't work (but manual handles do): The problem is with the actuator motor or its wiring.
* Door won't latch: The latch bolt itself might be broken or misaligned, the striker plate might be damaged or bent, or the linkage could be disconnected.
* Door won't unlock: Similar to the above, but the mechanism is jammed in the locked position.
2. Access the Latch Mechanism:
This usually involves removing the interior door panel. You'll need a trim removal tool (plastic pry tool) to avoid scratching the panel. There are plenty of videos on YouTube demonstrating this for a 2002 Chevy Blazer – searching "2002 Chevy Blazer door panel removal" will yield good results. Always disconnect the negative battery terminal before starting any electrical work.
3. Common Repairs and Solutions:
* Broken interior/exterior handle: These often need replacement. You'll find replacement handles at auto parts stores (e.g., AutoZone, Advance Auto Parts) or online retailers. The replacement involves removing the broken handle and installing the new one.
* Broken linkage: Carefully examine the linkage connecting the handles to the latch. If it's broken, you might be able to repair it with a small wire or replace the entire linkage (if available separately).
* Broken actuator: This requires replacing the actuator motor. Again, you'll find replacements at auto parts stores or online. This often involves some electrical work to disconnect and reconnect the wires.
* Broken latch bolt: This is the most involved repair. It might require replacing the entire latch assembly. This is a more complex repair and may require some mechanical skill.
* Bent or damaged striker plate: This is usually the easiest fix. You might be able to bend it back into shape, or you might need a replacement. These are inexpensive and readily available.
4. Replacement Parts:
Finding replacement parts is easiest at your local auto parts store, using your vehicle's VIN number. They can help identify the correct parts. Online retailers like Amazon or eBay are also good options, but make sure you're ordering the correct part for your specific year and model.
5. Seeking Professional Help:
If you're not comfortable working on your vehicle yourself, or if the problem is particularly complex, it's best to take your Blazer to a qualified mechanic. Improper repair can lead to further damage or safety issues.
Before you begin: Take photos of each step of disassembly to help you put it back together correctly. Remember to consult a repair manual or online resources specific to your 2002 Chevy Blazer to find detailed instructions and diagrams. There are many helpful videos available online that can guide you through the process.
