Case IH 520599-03 - BCM – BCM: High power voltage supply (circuit 'd') out of range - high

The Body Control Module is detecting that the "High power voltage supply" (circuit 'd') is exceeding the maximum expected voltage threshold (out of range - high).

• MAGNUM AFS Connect

1. 1

   Verify the overall system battery voltage and alternator output to ensure the machine is not overcharging

2. 2

   Inspect the wiring harness connected to the BCM for any chafing or melting that could cause a short to battery power

3. 3

   Check the high-power supply pins at the BCM connector with a multimeter to confirm if the voltage is actually too high or if the BCM is reading it incorrectly

1. 1

   Repair wiring harness

   If the harness is shorted, locate and repair the shorted wires.

2. 2

   Replace and reprogram BCM

   If the voltage supply is normal but the BCM reports it as high, the BCM itself must be replaced and reprogrammed.