2000 Caravan 3.0L. No odometer or PRNDL display. No A/C controls. Wipers cycle twice when starting vehicle with wiper switch in 'OFF' position. No communication with BCM, IPC, or Trans. Communication allowed only with Engine. Replaced ignition switch and BCM from dealer. Checked all fuses to BCM but cannot test powers and grounds to BCM that come from plugging into juction box/fuse & relay panel. Wipers, RKE, power mirrors, other accessories work. What to do now?

The common cause of this problem is the Park Neutral switch, also called the range switch, it is on the side of the transmission.It mounts externally on the transmission on the front or driver's side of the transmission. Most have a three wire connector that plugs in to it and you can take them out with a socket or large wrench.

Also the instrument cluster needs to be inspected.---------The soldering on the instrument cluster board gets short and causes this problems.------- Also the HVAC control,connectors on the cluster board needs to be inspected.-----
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The PCM on this vehicle uses inputs from 3 different switches/ sensor for this:

(1) Transmission range switch, located on the outside of the transmission, just above the transmission pan, white in color

(2) Park/ Neutral position switch , also located on the outside of the transmission case, above the pan, near the transmission range switch; black in color

(3) Transmission range switch/ sensor, located inside of the transmission.

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This will help.Thanks.helpmech.