check the power and ground circuits to the BCM, even though according to all of our information, the BCM on this vehicle should have nothing to do with the gauge operation.

The power circuits consist of:
1) An orange wire, fused ignition switch output (start/run) on pin No. 18 of the C1 connecter,
2) A violet wire fused (B+) on pin No. 8 of the C2 connecter, and
3) A brown with pink trace wire fused ignition switch output (ACC/Run) on pin No. 15 of the C2 connecter.
The grounds consist of:
1) A black/orange wire on pin No. 16 of the C1 connecter, 2) A black wire on pin No. 24 of the C2 connecter, and 3) A black wire on pin No. 8 of the C3 connecter.
When checking the power and ground circuits into the BCM, we found that the circuit to pin No. 18 on the orange wire - which should have had fused (B+) from the power distribution center (PDC) - fuse No. 18, a 15-amp fuse, was actually at 0 volts. When we traced the wire back through the circuit from the PDC under the hood to the S101 splice located by the battery temp sensor take-off in the wiring harness at the right front fender to the C236 connecter, we discovered that the wire had corroded at the C236 connecter pin H8. This is a white 10-pin connecter located in the connecter bracket to the left of the steering column under the left side of the dash. Once it was repaired, the IC came back to life with all of the gauges working. A test drive confirmed that the Jeep was fixed.