Installing a CD changer to the Corolla factory deck will require you to get a universal changer with an FM modulator. The stereo on the 1999 Toyota Corolla does not have the connections to hook a changer directly to the deck, so you will need to run the signal through your FM stereo. You need to find a good place to mount your changer and the display unit that will come with the changer. There will be one data cable to run from the changer to the dashboard. Spend some time to find the best way to run the cable from the dash to the changer.
Instructions
1. Pull out the deck by removing the AC knob and unclipping the shift panel. You can now unclip the dash assembly below the stereo and remove the screws holding the deck in place.
2. Locate a spot to mount the FM modulator behind the dash. Screw it directly into the plastic, making sure you don't get in the way of the other wires behind the dash and keeping it close to the deck.
3. Plug the antenna lead directly into the antenna input on the FM modulator.
4. Connect the two power wires coming from the modulator to the power coming from the deck. There is a switched 12-volt source wire and a constant-power wire to connect.
5. Ground the modulator to a nearby screw by running the ground wire coming off the modulator to a screw that you can loosen enough to wrap the wire around it. Tighten down the screw to hold the wire in place.
6. Mount the changer in the spot you have selected, making sure you have room to eject the CD magazine in the changer.
7. Run the data cable from the changer to the modulator. Plug one end of the cable into the changer and the other end into the modulator. There is only one place the plug will fit on both ends.
8. Find an open frequency on your FM dial and set the modulator to that frequency.
9. Mount your display unit to the dashboard. Attach double-sided tape to the display and stick the unit to your dashboard.
10. Replace your deck.
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