So anyhow, when the high beams come on, the relay will close and feed power to the low beams. Normal low-beam operation is unaffected. I think I'd recommend running a separate power feed to the low beams through the relay, rather than trying to run all four headlamps using the power feed for the high beams.
I tried this on my 96 (had done it on other cars without any problems) but found one annoying little problem:
The $&%@ Lamp Monitor tells me I have headlamp problems whenever I turned on the highbeams!
I looked thru the wiring diagrams, and it'* probably fixable using a basic little diode or something where the sensing wire comes into the monitor module (to prevent "back feed" when both circuits are hot), just been too lazy to dig any deeper into it