Buick 2012 LaCrosse User manual

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2012 - 2016 Buick LaCrosse eAssist
2012 - 2016 Buick Regal eAssist
GM Service Technical College provides First Responder Guides (FRG) and Quick Reference (QR) Sheets free of charge to First Responders.
FRGs and QRs can be displayed in a classroom as long as they are represented as GM information and are not modified in any way.
GM’s First Responder Guides are available at www.gmstc.com

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The intent of this guide is to provide information to help you respond to emergency situations involving the Buick
LaCrosse and Regal eAssist vehicles in the safest manner possible. This guide contains a general description of
how the Buick LaCrosse and Regal eAssist vehicle systems operate and includes illustrations of the unique
components. The guide also describes methods of disabling the high voltage system and identifies cut zone
information.

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Vehicle Specifications
The Buick LaCrosse and Regal
eAssist vehicles are front-wheel
drive, five passenger hybrid electric
vehicles. The eAssist system utilizes
a high voltage battery, located in the
trunk, as a supplemental power
source. The system assists the
engine utilizing a high torque belt
driven starter / generator.

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Vehicle Identification
The Buick LaCrosse and Regal eAssist do NOT use
exterior badging to identify them as eAssist vehicles.
To differentiate between standard and eAssist Buick
LaCrosse and Regal vehicles, look in the following
places to determine if high voltage exists:
Under the hood features:
•Large orange cable connected to generator
•Yellow First Responder Cut Tape Label
Instrument panel cluster features:
•Economy gauge
•Auto stop position on tachometer
Trunk features:
•Battery label
Economy
Gauge
Auto Stop
on
Tachometer

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Low Voltage System
High Voltage
3-Phase Cables
High Voltage
Battery
There are two separate electrical
systems within the eAssist vehicles:
low voltage (12V) and high voltage
(130V). The low voltage system is
similar to a conventional vehicle.
The low voltage system provides the
energy needed to enable the high
voltage system, therefore, when
approaching an emergency
situation, the low voltage system
must be disabled.

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The Buick LaCrosse and Regal eAssist system is
composed of the following components:
•High voltage starter / generator
•3-phase electric power cables
•High voltage lithium-ion battery
System Components
High Voltage
Lithium-Ion Battery
3–Phase Electric Power
Cables
High Voltage
Starter / Generator

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High Voltage Lithium-Ion Battery
The Buick LaCrosse and Regal eAssist system features a 130 volt lithium-ion battery, which provides electrical
energy to the starter / generator. The high voltage battery assembly is located in the trunk behind the rear
passenger seats. The assembly includes several internal components that operate together to provide and control
the high voltage for the eAssist system.

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3-Phase Electric Power Cables
3-Phase Electric Power
Cables
The 3-phase electric power cables connect the high voltage battery assembly to the starter /
generator. These cables are housed in a labeled protective metal tubing under the vehicle.

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High Voltage Starter Generator
High Voltage
Starter / Generator
The eAssist system is designed to restart the engine after an auto stop and supplement engine torque on
various powertrain configurations which improves fuel economy.

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System Operation
The eAssist system is designed to shut the engine off or auto stop when the vehicle is NOT in motion, restart the
engine after an auto stop, and supplement engine torque.
The eAssist system provides an electric boost to the powertrain system during heavy acceleration and grade
driving. This boost enables the transmission to operate more efficiently. The added functionality of the electric
boost, engine auto stop, and early deceleration fuel shut-off results in fuel savings.