Before you begin:
* Consult your owner's manual: This will give you the most accurate and specific instructions for your vehicle.
* Gather your tools: You'll likely need a small flathead screwdriver, possibly a Phillips head screwdriver, and potentially some plastic trim tools to avoid scratching the plastic. If your mirror is power-adjustable, you might need a socket wrench. Have your new mirror ready.
* Take pictures: Before you start disassembling anything, take photos of the process. This will be invaluable if you run into trouble reassembling.
General Steps (Power Mirror - Most Common):
1. Disconnect the battery: This is crucial to prevent accidental short circuits. Disconnect the negative (-) terminal first.
2. Remove the interior trim: Locate the small access panel on the inside of the door, usually near the mirror's base. This panel will be held in place by clips. Carefully pry it open with your plastic trim tools or a flathead screwdriver (be gentle to avoid breaking the clips).
3. Disconnect the electrical connectors: You should see the electrical connector(s) for the mirror's power, heating element (if equipped), and turn signal (if equipped). Carefully unplug these connectors.
4. Remove the mirror housing: Depending on the Trailblazer model, this might involve removing screws from the inside of the door (which might be hidden behind the interior trim panel) or carefully prying the mirror housing away from the door panel. It's likely held in place by clips or a few screws. There may also be a small retaining clip at the base of the mirror arm on the door itself.
5. Detach the mirror glass: The glass itself will likely be held in place with clips or a small screw.
6. Install the new mirror: Reverse the steps above, ensuring that the electrical connectors are securely plugged in and the mirror glass is properly seated. Make sure the mirror housing is correctly secured.
7. Reassemble the interior trim: Carefully snap the interior trim panel back into place.
8. Reconnect the battery: Reconnect the positive (+) terminal and then the negative (-) terminal.
Manual Mirror:
The process is significantly simpler with a manual mirror. You'll likely only need to remove the interior trim panel, potentially a few screws holding the mirror housing to the door, and then the mirror itself should just pull off. Reinstallation is the reverse process.
Important Considerations:
* Clips: Be very careful when using plastic trim tools or screwdrivers to remove the trim panels and mirror housing. These clips are fragile and can easily break.
* Wiring: If you encounter any difficulty, it's best to consult a repair manual or a professional. Incorrect wiring can damage the electrical system.
* Mirror Type: Make sure you buy a replacement mirror that matches your existing mirror (power/manual, heated, turn signal).
If you are uncomfortable with any part of this process, it's strongly recommended that you take your vehicle to a qualified mechanic. Improper installation can lead to damage or malfunction.
