No Comm From Micro to INPBD1

Communication failure between the microprocessor and the input board 1 (INPBD1).

Possible causes

Connection failure in the CAN harness
Loss of power to the INPBD1 board
Internal failure of the input board

Recommended actions

Check INPBD1 board data connector
Measure supply voltage (12V) on the board
Verify CAN bus terminating resistors
Replace input board if powered but not communicating

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