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If I recall correctly the "Harmon Base Audio" head unit was not installed at the factory but at the port of entry or the dealership. If the Harmon head unit worked correctly with the trunk amp, why did Toyota go to all the trouble to produce a technical document and parts kit to facilitate bypassing the amp as part of the Harmon install? There must be some sort of incompatibilty between the HU and trunk amp. Perhaps the speaker level signal from the Harmon is too large for the input of the amp? If using the Harmon/trunk amp combo worked correctly it would have been far less expensive to just go with it rather than bypass it.
Of course, the solution they arrived at doesn't work that well either.
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