If you want an IPod connection to your Corolla’s factory stereo you could pay your local electronics store $50 - $100 for installation; or you can install that cable yourself for free. I want to show you how easy it is to install an iPod interface cable yourself.
There are several companies that offer a cable that will connect your IPod to a Corolla’s factory stereo. Even though each company’s product may look different, they will all install essentially the same way. For these instructions I will be using the Spec USA PA15-Toy. The Spec USA PA15-Toy consists of 3 parts. There is an interface box and two cables; one that goes from the interface box to your IPod and another from the interface box to the back of the radio.
For this installation you will need a #2 Phillips screwdriver and a ratchet with a 10mm socket and extension arm to reach the back screws. Depending on where you decide to locate the IPod you may also need a drill with a 5/8” bit.

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step 1Remove Lower Trim
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step 2Removing the Radio
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step 3Install iPod Cable to Radio
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step 4Connect Remaining Components
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step 5Replace Trim
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http://www.instructables.com/id/Installing-an-iPod-Interface-Cable-into-a-Toyota-C/