High Voltage Disconnection Procedure

High Voltage Disconnection Procedure

High-voltage components: high-voltage battery, Power Relay Assembly (PRA), Quick Charge Relay Assembly (QRA), motor, power cable, BMS ECU, inverter, LDC, On-Board Charger (OBC), main relay, precharge relay, precharge resistor, battery current sensor, safety plug, main fuse, battery temperature sensor, busbar, charging port, A/C compressor, Electric Power Control Unit (EPCU), high-voltage heater, high-voltage heater relay, etc.

1. 1
   Turn the ignition OFF and disconnect the negative (-) terminal of the auxiliary battery.
2. 2
   Remove the cover (A) from the rear seat floor mat.

   

3. 3
   Loosen the nut and remove the service cover of the safety plug (A). Service cover mounting nut: 7.8 ~ 11.8 N·m

   

4. 4
   Remove the safety plug (A).

   

   Remove the safety plug in the following order.

5. 5
   Wait at least 5 minutes or until the capacitor in the high-voltage system is fully discharged.
6. 6
   Measure the voltage between the inverter terminals to confirm that the capacitor in the inverter is fully discharged.

   1. Raise the vehicle.
   2. Remove the high-voltage battery lower cover (A) by loosening the bolt.

      

   3. Disconnect the high-voltage cable (A).

      

   4. Measure the voltage between the inverter terminals. Less than 30 V: High-voltage circuit is properly closed. More than 30 V: Malfunction in the high-voltage circuit.