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You should be able to press the 3 and 5 memory preset buttons at the same time and the headphone icon should then appear in the radio display which indicates the rear seat controls are active.
You should then be able to press the speaker/headphone control and then press the mode button to change the audio source for headphone mode only.You can also press the 2 and 4 preset buttons on the front controls instead of the mode button to put the unit in the dual play mode.
See if this works.