If you have a schematic and you can inspect inside the CCU then you are in pretty good shape. Unfortunately you probably don't have a schematic of the CCU itself since it is not published AFAIK.

Reverser circuits can be a little confusing. I gave up teaching electrical troubleshooting over the internet. All I can say is you have a good side to compare to so that should help.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra