Which audio system do you have? Does your system have an amplifier separate from the radio unit? If it has an amplifier, is it in the passenger-side kick panel, or is it in the trunk? How many speakers does it have in the front doors? Any speakers in the rear doors?
I only have the ‘02 manual in my phone, and I see the two wires you are asking about in that. I have the ‘04 manual in my desktop computer but I won’t be able to look at that until tomorrow (Sunday) morning (it is 10:30 pm Saturday night here now). I’d rather give you the info. out of the ‘04 manual to be sure it is accurate for your year car - sometimes they changed wire colors in different years.
But telling me which audio system you have (how many speakers, and where the amplifier is located) will also ensure that I provide information that is accurate for your car.
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs