Unit of competency Outline

Date retreived
22/07/2026 2:10 PM AWST

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Diagnose and repair high voltage cabin heating and cooling systems in battery electric vehicles

Diagnose and repair high voltage cabin heating and cooling systems in battery electric vehicles

Unit of competency
National Code
AURETH4008
State Code
WC278
TGA Status
Replaced
DTWD Status
Replaced
Current Release Number
2.00
Current Release Date
17/01/2013
State Implementation and Classification
Approved Date
Field of Education
030505 - Automotive Electrics And Electronics
Original Release Date
Nominal Hours
40
Description
This unit describes the performance outcomes required to diagnose and repair high voltage (HV) systems used to heat, ventilate and cool the cabin in battery electric vehicles (BEVs). It involves testing systems for correct operation and replacing some components. It may include removal of refrigerant and replacement of refrigerant as well as performance testing of the system.Importance is placed on the application of HV safety procedures.Licensing, legislative, regulatory or certification requirements may apply to this unit in some jurisdictions, in particular if the work involves removal and replacement of refrigerant. Users are advised to check with the relevant regulatory authority.
Notes
Elements and Performance Criteria
1. Prepare for repair operations
  • 1.1. Procedures and information relevant to the task are sourced and work requirements confirmed
  • 1.2. Workplace health and safety (WHS) requirements and appropriate precautions are identified and applied
  • 1.3. Repair methods for the specific work requirement are selected and prepared for
  • 1.4. Tools and testing equipment necessary to conduct the work are assembled
  • 1.5. Technical and/or calibration requirements for diagnosis and repair of HV HVAC systems are established
2. Perform diagnosis
  • 2.1. Tests and checks on HVAC adjustment and activation controls are carried out using manufacturer specifications and test procedures
  • 2.2. Air conditioning and electric heater systems are tested for correct operation
  • 2.3. HVAC contactors are tested for correct operation
  • 2.4. Results of diagnosis are recorded
3. Repair HVAC system
  • 3.1. Results are compared with manufacturer specifications to decide on appropriate corrective action
  • 3.2. Components are removed and replaced as required
  • 3.3. Replaced components are re-tested for correct operation
  • 3.4. Replacement, repair or adjustment procedures carried out are recorded
4. Complete repair operations
  • 4.1. Work area is tidied, and tools and equipment replaced according to workplace requirements
  • 4.2. Job card or repair order is completed according to workplace requirements
  • 4.3. Client report is prepared on the outcomes of the repair according to workplace requirements
  • 4.4. Vehicle is prepared for return to the client
Range Statement
The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.
Procedures and information may include:
Australian standards
diagrams and sketches
engineer or manufacturer design specifications and instructions
industry codes of practice
material safety data sheets (MSDS)
parts catalogues
verbal, written and graphical instructions issued by authorised internal and external persons
workplace specifications and requirements.
WHS requirements may include:
elimination of hazardous materials and substances
first aid equipment
following emergency procedures
hazard and risk control
personal protective equipment (PPE) and clothing
safety equipment
techniques for manual handling, including shifting, lifting and carrying.
Appropriate precautions may include:
analysing task to define risk
applying electrical safety precautions, such as:
“one hand rule”
live system warning tags or signs
checking system for residual voltage
depowering the vehicle
isolating the HV battery electrical supply
using PPE, such as:
electrical safety gloves 1000V
HV insulating mats (Australian standards rated).
Testing equipment may include:
AC/DC current clamp
air conditioning system service equipment
battery management system (BMS) diagnostic equipment
insulation or mega ohm tester
multimeter CAT 3 1000V
oscilloscope
refrigerant leak detecting equipment
thermal imaging equipment or non-contact thermometer.
Tests and checks may include:
operational tests of heating, ventilation and air conditioning
refrigerant leak detecting
testing of contactors.
Corrective action may include:
removing and replacing control units
removing and replacing heater coolant
removing and replacing heating elements
removing and replacing HVAC components, such as condenser, evaporator, compressor and heater core.
Workplace requirements may include:
industry codes of practice
manufacturer specifications
quality policies and procedures
safe work procedures
sustainability, environment, equal opportunity and anti-discrimination policies and procedures
workplace recording and reporting procedures.
Evidence Guide
The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.
Overview of assessment

Critical aspects for assessment and evidence required to demonstrate competency in this unit
The evidence required to demonstrate competency in this unit must be relevant to workplace operations and satisfy all of the requirements of the performance criteria and required skills and knowledge.
A person who demonstrates competency in this unit must be able to:
comply with WHS requirements and safe work practices
ensure electrical and mechanical integrity of the HVAC components is maintained when performing tests
check the operation of the HV HVAC systems against manufacturer specifications
diagnose and replace, repair or adjust system components as required to correct deficiencies
complete relevant documentation.
Context of, and specific resources for assessment
Competency is to be assessed in the workplace or a simulated workplace environment that accurately reflects performance in a real workplace setting.
Assessment is to occur:
using standard workplace practices and procedures
following safety requirements
applying environmental constraints.
Assessment is to comply with relevant:
regulatory requirements
Australian standards
industry codes of practice.
Competency is to be assessed using a BEV that uses HV and LV AC/DC electrical systems. Where simulation is used, an operational BEV must be included in the simulation.
The following resources should be made available:
appropriate PPE
a BEV
manufacturer specifications for the BEV
testing equipment
full range of essential tools and equipment
workplace documentation.
Method of assessment
Assessment must satisfy the endorsed Assessment Guidelines of this Training Package.
Assessment methods must confirm consistency and accuracy of performance (over time and in a range of workplace relevant contexts) together with the application of required skills and knowledge.
Assessment methods must be by direct observation of tasks and include questioning on required skills and knowledge to ensure correct interpretation and application.
Competence in this unit may be assessed in conjunction with other units which together form part of a holistic work role.
Where applicable, reasonable adjustment must be made to work environments and training situations to accommodate the needs of diverse clients.
Assessment processes and techniques must be culturally sensitive and appropriate to the language, literacy and numeracy capacity of the candidate and the work being performed.