21090
28-Jun-16
1 of 4
AUTOMOTIVE ELECTRICAL AND
ELECTRONICS
Demonstrate knowledge of automotive
multiplex and databus applications, and
diagnose faults
level:
5
credit:
6
planned review date:
December 2008
sub-field:
Motor Industry
purpose:
People credited with this unit standard are able to identify
and distinguish automotive multiplex and databus
applications, and diagnose faults in multiplex wiring systems.
entry information:
Open.
accreditation option:
Evaluation of documentation and visit by NZQA and industry.
moderation option:
A centrally established and directed national moderation
system has been set up by the NZ Motor Industry Training
Organisation.
special notes:
1
The following legislation must be consulted and
followed where applicable:
Consumer Guarantees Act 1993;
Fair Trading Act 1986;
Health and Safety in Employment Act 1992.
2
Reference to company policy means that the standard
must comply with any policies, procedures, and
requirements of the company involved, and the ethical
codes of relevant professional management
organisations.
3
The practical skills of this unit standard can be
assessed in the workplace or in simulated workplace
conditions off-job. For the purpose of off-job
assessment the term customer means the training
provider.
 New Zealand Qualifications Authority 2016
21090
28-Jun-16
2 of 4
AUTOMOTIVE ELECTRICAL AND
ELECTRONICS
Demonstrate knowledge of automotive
multiplex and databus applications, and
diagnose faults
Elements and Performance Criteria
element 1
Identify and distinguish automotive multiplex and databus applications.
performance criteria
1.1
The description distinguishes differences between multiplex wiring and
conventional wiring according to the manufacturers’ specifications.
Range:
1.2
The explanation shows a typical operational sequence for a multiplex circuit.
Range:
1.3
may include but is not limited to – weight reduction, easier
assembly, simplicity, greater reliability, simpler fault diagnosis and
repair, cost savings, design flexibility.
The description identifies approaches manufacturers use for multiplexing
electrical systems consistent with the manufacturers’ specifications.
Range:
1.5
may include but is not limited to – turning on a lamp.
The description identifies features of multiplex wiring according to the
manufacturers’ specifications.
Range:
1.4
includes but is not limited to – replacing partly or completely by a
single common bus, power and control signals, high power IC
(integrated circuit) devices, electronic switching.
includes but is not limited to – each load has its own interface
connected to the multiplex bus, loads are grouped together and
share a common electronics module.
Multiplex component functions are described according to the manufacturers’
specifications.
Range:
components may include but are not limited to – control module,
input/output module, display module, data link cable.
element 2
 New Zealand Qualifications Authority 2016
21090
28-Jun-16
3 of 4
AUTOMOTIVE ELECTRICAL AND
ELECTRONICS
Demonstrate knowledge of automotive
multiplex and databus applications, and
diagnose faults
Diagnose faults in multiplex wiring systems.
performance criteria
2.1
Safe working practices are observed throughout the task.
Range:
personal safety, safety of others, safe operation of test equipment,
vehicle and machine safety, preventing damage to circuits and
components.
2.2
Suitable equipment is selected and used to enable testing to be carried out.
2.3
Test points are identified according to the vehicle manufacturers’ specifications.
2.4
The self-test codes are activated, read, and interpreted, with reference to the
manufacturers’ literature, and any faulty circuit is identified.
2.5
Faults are isolated according to test procedure findings.
Range:
2.6
any slave module, data link connection.
The cause of the fault is determined according to the manufacturers’
specifications.
Comments on this unit standard
Please contact the NZ Motor Industry Training Organisation jlane@mito.org.nz if you wish
to suggest changes to the content of this unit standard.
Please Note
Providers must be accredited by the Qualifications Authority or a delegated interinstitutional body before they can register credits from assessment against unit standards
or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by the Qualifications Authority before
they can register credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
 New Zealand Qualifications Authority 2016
21090
28-Jun-16
4 of 4
AUTOMOTIVE ELECTRICAL AND
ELECTRONICS
Demonstrate knowledge of automotive
multiplex and databus applications, and
diagnose faults
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for providers wishing to
develop education and training programmes, such as minimum qualifications for tutors and
assessors, and special resource requirements.
This unit standard is covered by AMAP 0014 which can be accessed at
http://www.nzqa.govt.nz/site/framework/search.html.
 New Zealand Qualifications Authority 2016