Buick Encore: Electrostatic Discharge (ESD) Warning
NOTE: This article is intended for general information purposes
only. Contents are
generic in nature and all information may or may not apply to all vehicles.
INTRODUCTION
NOTE: This article is intended for general information purposes
only. Contents are
generic in nature and all information may or may not apply to all vehicles.
All Electrostatic Discharge (ESD) sensitive components contain solid state
circuits (transistors, diodes,
semiconductors) that may become damaged when contacted with an electrostatic
charge. The following
information applies to all ESD sensitive devices. The ESD symbol shown in Fig.
Fig. 1 may be used on
schematics to indicate which components are ESD sensitive. See Fig. 1. Although
different manufactures may
display different symbols to represent ESD sensitive devices, the handling and
measuring precautions and
procedures are the same.
Fig. 1: Sample ESD Symbol
HANDLING STATIC-SENSITIVE CIRCUITS/DEVICES
NOTE: This article is intended for general information purposes
only. Contents are
generic in nature and all information may or may not apply to all vehicles.
When handling an electronic part that is ESD sensitive, the technician should
follow these guidelines to reduce
any possible electrostatic charge build-up on the technician's body and the
electronic part.
- Always touch a known good ground source before handling the part. This
should be repeated while
handling the part and more frequently after sitting down from a standing
position, sliding across the seat
or walking a distance.
- Avoid touching electrical terminals of the part, unless instructed by a
diagnostic procedure.
- DO NOT open the package of a new part until it is time to install the
part.
- Before removing the part from its package, ground the package to a
known good ground source.
CHECKING STATIC-SENSITIVE CIRCUITS/DEVICES
NOTE: This article is intended for general information purposes
only. Contents are
generic in nature and all information may or may not apply to all vehicles.
- Solid State circuits in electronic devices are shown greatly simplified
in schematics. See Fig. 2. Due to
the simplification of the electronic devices on the schematic, resistance
measurements could be
misleading or could lead to an electrostatic discharge. Always follow the
recommended diagnostic
procedure.
Fig. 2: Sample Schematic Showing Typical ESD Sensitive Device
- Only measure resistance at the terminals of the devices when instructed
by the recommended diagnostic
procedure.
- When using a voltmeter, be sure to connect the ground lead first.
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NOTE: Examples used in this article are general in nature and do
not necessarily relate
to a specific engine or system. Illustrations and procedures have been chosen
to guide mechanic through engine
NOTE: Examples used in this article are general in nature and do
not necessarily relate
to a specific engine or system. Illustrations and procedures have been chosen
to guide mechanic through engine
NOTE: Examples used in this article are general in nature and do
not necessarily relate
to a specific engine or system. Illustrations and procedures have been chosen
to guide mechanic through engine
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The airbag system does not need
regularly scheduled maintenance or
replacement. Make sure the airbag
readiness light is working. See
Airbag Readiness Light
Caution
If an airbag covering is damaged,
opened, or broken, the airbag
may not work properly. Do not open or break the airbag
coverings. If the
CRUISE CONTROL DESCRIPTION AND OPERATION
Cruise Control System Block Diagram
Fig. 4: Identifying Cruise Control System Block Diagram
Cruise control is a speed control system that maintains a desired vehicle
speed under normal driving conditions
at speeds above 40 km/h (25 mph). Steep grades may