Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Drive Motor Battery System Description: Notes
The hybrid energy storage system uses a number of modules and components to store electricity for use by the eAssist system. The hybrid energy storage system stores 115 V DC in two lithium-ion battery sections. Current flows from the battery sections through a series of contactors and a service disconnect. This allows the system to control the disconnect of high voltage from the vehicle and also creates a redundant disconnect to ensure voltage is disabled when servicing high voltage components. To ensure optimum life of the lithium-ion batteries, the hybrid energy storage system monitors the state of charge of each battery cell. The system will equalize the state of charge of each cell through a balancing process. The hybrid energy storage system is also responsible for monitoring and controlling the charging and the discharging of the high voltage battery.
The primary component of the hybrid energy storage system is the hybrid/EV battery pack. The hybrid/EV battery pack is a modular battery pack assembly that not only contains the lithium-ion battery sections, but also many of the control modules and components used by the eAssist system.
The Hybrid/EV Battery Pack contains the following serviceable components:
- Hybrid/EV Battery Section 1
- Hybrid/EV Battery Section 2
- Battery Energy Control Module
- Starter/Generator Control Module
- Main Contactor - located in the generator battery disconnect relay assembly
- Pre-Charge Contactor - located in the generator battery disconnect relay assembly
- Hybrid/EV Battery Pre-Charge Resistor - located in the generator battery disconnect relay assembly
- Hybrid/EV Battery Pack Current Sensor - located in the generator battery disconnect relay assembly
- Hybrid/EV Battery Pack High Voltage Manual Disconnect Lever - located in the battery energy control module wiring junction block assembly
- Generator Battery Fuse - located in the battery energy control module wiring junction block assembly
- High Voltage Interlock Switch
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.