Help for sony XR-3324 - I want to add Auxiliary Input

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Hi all

I have a old Sony XR-3324 Cassette player (a car stereo) working perfectly. I want to add auxiliary input to this so that i can play music from external portable devices. I tried finding the service manual for pinout information, but couldnt get any.
I request you , if anyone has a service manual (not owners manual) for Sony-XR-3324. OR Pinout information of this model.

I Could read on the IC as "SONY 270-07 4E1" which is on the back with heatsink.

Thank you all
 
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