This one has me about to go nuts. 1993 Caravan 2.5 5 speed manual trans. 268K miles, up until now it just always works. Now it starts and runs fine, but no check engine light during startup and speedo, odometer, temp gauges don't work. Domelights don't work except manually on the lights, but the drivers door triggers a chatter from the BCM and the seatbelt light flashes dimly. Hooked up OTC scan tool on PCM, no codes, no issues. Discovered the OTC only works on the A604 trans version for CCD so I can't check the CCD bus. Fuses are good, swapped in second BCM but no change. Bus aren't rounded, and there is continuity from PCM to BCM on both. Factory service and body diagnostic manuals were no help.