The obd2 system on your 2001 might be quicker to learn. I've had a few obd1 cars that would take a few trips to readjust the air fuel ratios. The worst thing that ever happened was my 93 ford probe stalled when rolling to a stop. Not a big deal.
That being said, If you're just installing a stereo head unit, it's much easier to just pull the fuse for it from the fuse panel. If you're running new wires for a new amplifier and what not, then yeah, pull the negative wire from the battery.
Also, there are ways to get usb and bluetooth on old stock head units with cd changer controls. If you're interested in that alternative, I could tell you about it. I have a black box with a usb and sd card slot in my glove box. It works on the tape deck in my 93. It uses the rca audio inputs and the cd changer din connection on the back of the deck.
If you're not, I get it. Some people lime these old school OEM (Alpine) units though.
Thanks for the replies. Yes, I remember now mine relearns very quickly from just a short drive. I figured this out when my battery completely died a couple years back, and as soon as I put the new one in I went for an emissions test and it failed. I drove it around for about 10 minutes and went back and it passed just fine. As far as the head unit replacement, I did disconnect the negative just in case and it drove just fine this evening.
I actually already had an aftermarket unit, a really nice Pioneer from 2001 with the CD changer, which used an IP-BUS cable to connect to the deck. I know I could have used the IP-BUS cable with an Iphone or player either bluetooth or direct but I could not figure out how to use it to play from a USB using the deck controls, which I what I prefer. Both Pioneer and Crutchfield told me the deck wouldn't read from a USB, much less be able to control it, maybe I should have asked here as well. In any case, the swap is done and was super easy and I went with a Kenwood.
Speaking of amps and wires & mounting, I am going to add a Matrix Plus pre-amp to my setup. I have one in my truck and it's fabulous. My two amps are mounted in the trunk vertically on the front wall above the spare tire. The Matrix will fit nicely on that flat spot to the right of the amp pictured, even with the amp endcap installed. I am wondering if you know if it's safe to use a short screw or two there to mount the Matrix, or is the gas tank right up against there? If not, I'll either use some Velcro or fabricate a bracket that could attach to the wood the amp is mounted to, as the Matrix is light, only about 2 lbs.
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