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- Check for continuity between GND, 3.3 V, 5 V, and 12 V. All of these should be isolated from each other.
- Remove R23.
- Supply 12 V between GND and 12 V. A current limit of 100 mA should be sufficient for most testing. Switching the relays and/or fans will require more current (up to 4 A). Measure the voltage between GND and 3.3 V, and GND and 12 V.
- Enable Set PB0 high to enable the 5 V converter. Measure the voltage between GND and 5 V.
- Connect an oscilloscope probe between GND and 5 V to measure the ripple of the 5 V converter.
- Turn off the power supply.
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- Connect a controller board to the BMS carrier.
- Close the kill switch or short the connector.
- Supply the board with 12 V between GND and 12 V.
- Set PB9 high to enable the HSD and activate the relay to power the main relay coils. There should be an audible click as the on-board relay closes. Set PB9 low.
- Set PB4 high to enable the low side switch of the HV GND relay coil. Check for continuity between the GND pin of P10 and GND of the board. The two nets should be connected. Set PB4 low.
- Set PB3 high to enable the low side switch of the HV PWR relay coil. Check for continuity between the GND pin of P7 and GND of the board. The two nets should be connected. Set PB3 low.
- Turn off the power supply.