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Check for continuity between cell inputs, balance inputs, 3 V, 5 V, fused VBAT+ and fused VBAT-. All of these nets should be isolated from each other.
Connect the BMS carrier to the AFE isoSPI port A.
Connect the AFE to 12 cells in series, OR connect a power supply between VBAT+ and VBAT-. The power supply can be set to about 30 V with a current limit of about 100 mA.
Toggle the CS pin of the AFE isoSPI from the BMS carrier constantly with a delay of about 1 s.
Measure the voltage between 3 V and VBAT-, and 5 V and VBAT-.
Turn off the power supply.