AVIC D3 Wiring install on a 98 LC

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Hi guys,

Been reading here a long time, finally thought I'd post.

I have a Pioneer AVIC D3 that I'm trying to install.

I ordered the Metra 70-8112 harness.

My question is, the Metra harness has 4 RCAs, each one is to be plugged into a preamp output into the D3's Preamp Outputs. Each of the Metra Harnesses call for Positive inputs, (Left Front, Right Front , Left Rear, Right Rear).

The pioneer harness has Preamp Outputs, Negative and Positive, for front and rear only.

Can anyone shed some light on the subject?

Thanks in advance.