Here's a common approach:
1. Safety First: Disconnect the negative terminal of your vehicle's battery. This prevents short circuits and protects you from electrical shock.
2. Locate the Release Holes/Slots: Most car radios in the 1990s were installed using a metal sleeve or bracket with release slots/holes on the sides. These holes are usually concealed behind the radio's faceplate. You'll need a special radio removal tool, or you can often fashion a tool from sturdy wire coat hangers carefully bent into appropriate shapes.
3. Insert the Tool(s): Carefully insert the tool(s) into the release holes. You'll usually need to push or pry the release mechanism to the left or right to unlatch the radio. Apply gentle but firm pressure; don't force it.
4. Remove the Radio: Once the release mechanism is disengaged, the radio should slide out slightly. You might need to pull it out carefully by hand.
5. Disconnect the Wiring Harness: Once the radio is out, disconnect the wiring harness and antenna connector. Take photos or make a diagram to help you remember how to reconnect them correctly later. Some connectors might have a release tab.
6. Remove the Mounting Bracket (if applicable): In some cases, the radio might be attached to a mounting bracket. You may need to carefully remove this bracket as well.
Important Considerations:
* Radio Removal Tools: These are readily available at auto parts stores. They're specifically designed to avoid scratching the dash or damaging the radio.
* Wiring Harness: Be very careful when disconnecting the wiring harness. Damage to the connectors can cause issues with the new radio.
* Antenna Connector: Take care not to damage the antenna connector.
* Double-Check: Before you start reassembling everything, make sure that all your connections are secure.
If you're uncomfortable doing this yourself, it's best to have a qualified mechanic remove and install your radio. Improper removal can damage your dash or the radio itself.