Table of Contents
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1.0 INTRODUCTION
The procedures contained in this manual include
all the specifications, instructions and graphics
needed to diagnose 2001 body system problems. The
diagnostics in this manual are based on the failure
condition or symptom being present at the time of
diagnosis.
Please follow the recommendations below when
choosing your diagnostic path.
1. First make sure the DRBIII is communicating
with the appropriate modules; i.e., if the
DRBIII displays a ''No Response'' or "Bus +/-
signal open" condition, you must diagnose that
first.
2. Read DTC's (diagnostic trouble codes) with the
DRBIII .
3. If no DTC's are present, identify the customer
complaint.
4. Once the DTC or customer complaint is identi-
fied, locate the matching test in the Table of
Contents and begin to diagnose the symptom.
All component location views are in Section 8.0. All
connector pinouts are in Section 9.0. All schematics
are in Section 10.0.
An * placed before the symptom description indi-
cates a customer complaint.
When repairs are required, refer to the appropri-
ate service manual for the proper removal and
repair procedure.
Diagnostic procedures change every year. New
diagnostic systems may be added, and carryover
systems may be enhanced. READ THIS MANUAL
BEFORE TRYING TO DIAGNOSE A VEHICLE
DIAGNOSTIC TROUBLE CODE. It is recom-
mended that you review the entire manual to be-
come familiar with all the new and changed diag-
nostic procedures.
This book reflects many suggested changes from
readers of past issues. After using this book, if you
have any comments or suggestions, please fill out
the comment form in the back of the book and mail
it back to us.
1.1 SYSTEM COVERAGE
This diagnostic procedures manual covers all
2001 PL NEON VEHICLES
1.2 SIX-STEP TROUBLESHOOTING
PROCEDURE
Diagnosis of the body system is done in six basic
steps:
•
verification of complaint
•
verification of any related symptoms
GENERAL INFORMATION
•
symptom analysis
•
problem isolation
•
repair of isolated problem
•
verification of proper operation
2.0 IDENTIFICATION OF
SYSTEM
The vehicle systems that are part of the ''body''
system are:
•
Airbag System
•
Audio System
•
Exterior Lighting
•
Instrument Cluster
•
Interior Lighting
•
Power Door Locks/Remote Keyless Entry
•
Vehicle Communications
•
Vehicle Theft Security System
3.0 SYSTEM DESCRIPTION AND
FUNCTIONAL OPERATION
The body system on the 2001 PL consists of a
combination of modules that communicate over the
PCI bus (Programmable Communication Interface
multiplex system). Through the PCI bus, informa-
tion about the operation of vehicle components and
circuits is relayed quickly to the appropriate mod-
ule(s). All modules receive all the information trans-
mitted on the bus even though a module may not
require all information to perform it's function. It
will only respond to messages ''addressed'' to it
through a binary coding process. This method of
data transmission significantly reduces the com-
plexity of the wiring in the vehicle and the size of
wiring harnesses. All of the information about the
functioning of all the systems is organized, con-
trolled, and communicated by the PCI bus, which is
described in the Vehicle Communication Section of
this general information.
3.1 AIRBAG SYSTEM
The Airbag Control Module (ACM) is bolted to the
floor panel transmission tunnel rearward from the
gear shift selector inside the vehicle. The ACM
mounting bracket is welded to the tunnel and is not
serviced with the ACM. The ACM contains a micro-
processor, the impact sensor, and energy storage
capacitor. The microprocessor contains the airbag
system logic. The ACM system logic includes On-
Board Diagnostics (OBD) capability, and communi-
cates with the instrument cluster circuitry via the
PCI data bus to control the airbag indicator lamp.
1
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