I should have looked at the vehicle first to verify the speaker arrangement before posting. The midrange or "squawker" speakers in Lexusspeak are the larger dash-mounted units while the tweeters are smaller and A-pillar mounted. They are parallelled together but the wiring diagram doesn't show if there is passive crossover (capacitor) in the circuit, either for the group or just for the tweeter.
What I'm trying to determine is whether I'll need to install passive crossovers between the mid/tweet circuits and woofer circuits when I run an aftermarket radio's front speaker output to the OE wire harness at the (unplugged) OE amplifier. I assume Lexus provides some sort of crossover operation, either simple passive bandpass or active within the OE amplifier.
Any help would be appreciated.