Rather than pull the battery cable off and lose your radio security code, remove the "PCM BAT" fuse. That fuse can be either in the panel at the and of the dash, or in the convenience box under the hood, depending on the year of the car.
Look at the first 2 steps of this online guide - its for the LT4KM, but it shows removing the PCM/bracket from the fender. After you get the PCM off the fender, you can access the 4 connectors in the back. Just be careful about putting too much strain on the wires when you have the PCM loose.
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