Kia Soul EV Owner's Manual Quiz
Electric Vehicle Battery System

Main Relay Description and Operation

In this manual: Electric Vehicle Battery System
General Information — 17Maintenance — 17Drive Shaft and Axle — 15Suspension System — 36Steering — 24Restraints — 48Brake System — 37Body (Interior and Exterior) — 207Body Electrical System — 203Heating, Ventilation, and Air Conditioning — 80Electric Vehicle Battery System — 115
~1min read

Description

The main relay is installed in the Power Relay Assembly (PRA) and controls the high voltage line. It connects power between the high voltage battery and the high voltage junction box by the control signal of the BMS ECU. However, when a battery cell swells due to overcharging, the main relay and the precharge relay are not controlled by the RAD. The RAD is installed on each battery module and will not operate if the battery is normal. [With High Voltage Battery Heating System]
1. Main Relay (+)
2. Main Relay (-)
3. Precharge Relay
4. Precharge Resistor		 5. Battery Current Sensor
6. High Voltage Battery Heater Relay
7. High Voltage Battery Heater Fuse

[Without High Voltage Battery Heating System]
1. Main Relay (+)
2. Main Relay (-)
3. Precharge Relay		 4. Precharge Resistor
5. Battery Current Sensor

Operation

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A quick Kia Soul EV Owner's Manual quiz: every answer comes with an explanation and a link to the manual page.