| General information on refrigerant circuit |
| Vehicles with high-voltage system (hybrid vehicles) |
WARNING | Safety hazard: the engine can start unexpectedly. |
| Before carrying out general work on a vehicle with high-voltage electrical system, switch off the ignition and remove the ignition key from the vehicle. |
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WARNING | Working on vehicles with high-voltage wiring: |
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| Do not support yourself or tools on high-voltage wiring or associated components --> this can damage the insulation. |
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| High-voltage wiring must not be excessively bent or kinked --> this can damage the insulation. |
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| The round high-voltage connectors are colour-coded with an external coloured ring and are provided with mechanical coding or guide lugs. It is important to observe this coding when joining up the round high-voltage connectors, otherwise the connectors can be damaged. |
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DANGER! | Risk of fatal injury if high-voltage components are damaged. |
| Observe the following when working in the vicinity of high-voltage components or wiring: |
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| It is not permitted to use cutting or forming tools, other sharp-edged tools or heat sources such as welding, brazing, soldering, hot air or thermal bonding equipment. |
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| Before starting work, visually inspect the high-voltage components in the areas involved. |
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| Before working in the engine compartment, visually inspect the power electronics -JX1-, electric drive motor -V141-, air conditioner compressor -V470- and high-voltage wiring. |
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| Before working on the vehicle underbody, visually inspect the high-voltage wiring and covers. |
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| Before working on the rear section of the vehicle, visually inspect the high-voltage wiring and the electro-box with the maintenance connector for high-voltage system - TW -. |
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| Visually inspect all potential equalisation lines. |
| Check the following when making the visual inspection: |
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| There must be no external damage on any component. |
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| The insulation of the high-voltage wiring and potential equalisation lines must not be damaged. |
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| There must be no unusual deformation of the high-voltage wiring. |
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| All high-voltage components must be identified by a red warning sticker. |
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| If work is necessary in the vicinity of high-voltage system components, perform a visual inspection of the high-voltage components and wiring to check for damage → Chapter and note → Electrical system; Rep. gr.93. |
| De-energising high-voltage system |
DANGER! | Voltage can cause fatal injury. |
| Danger of severe or fatal injuries from electric shock. |
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| For reasons of safety, persons with life-preserving or other electronic medical devices in or on their body must not perform any work on the high-voltage system. Such medical devices include internal analgesic pumps, implanted defibrillators, pacemakers, insulin pumps and hearing aids. |
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| The high-voltage system may only be de-energised by a suitably qualified person (Audi high-voltage technician). |
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| It must be definitely confirmed that the high-voltage system is de-energised. The system may only be de-energised using the vehicle diagnostic tester via „Guided Fault Finding“. |
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| The qualified person (Audi high-voltage technician) confirms that the system is de-energised and uses the locking cap -T40262- to ensure that the system cannot be re-energised. The ignition key and the maintenance connector for high-voltage system - TW - should then be stored in a safe place by the qualified person. |
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| The qualified person (Audi high-voltage technician) marks the vehicle by attaching the appropriate warning signs. |
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| De-energising high-voltage system: |
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| Connect vehicle diagnostic tester |
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| Select Guided Fault Finding mode |
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| Using the Go to key, select the following menu items in succession |
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| Function/component selection |
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| Self-diagnosis compatible systems |
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| 8C - Hybrid battery management -J840 |
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| 8C - Hybrid battery management, functions |
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| 51 - De-energise high-voltage system (Rep. gr. 93) |
| Re-energising high-voltage system |
DANGER! | Voltage can cause fatal injury. |
| Danger of severe or fatal injuries from electric shock. |
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| For reasons of safety, persons with life-preserving or other electronic medical devices in or on their body must not perform any work on the high-voltage system. Such medical devices include internal analgesic pumps, implanted defibrillators, pacemakers, insulin pumps and hearing aids. |
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| The high-voltage system may only be re-energised by a suitably qualified person (Audi high-voltage technician). |
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| The system may only be re-energised using the vehicle diagnostic tester via „Guided Fault Finding“. |
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| The vehicle is then made ready for operation again by the qualified person (Audi high-voltage technician). |
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| The qualified person (Audi high-voltage technician) marks the vehicle by attaching the appropriate warning signs. |
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Note | t
| Re-energise high-voltage system: |
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| Connect vehicle diagnostic tester |
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| Select Guided Fault Finding mode |
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| Using the Go to key, select the following menu items in succession |
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| Function/component selection |
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| Self-diagnosis compatible systems |
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| 8C - Hybrid battery management -J840 |
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| 8C - Hybrid battery management, functions |
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| 51 - Re-energise high-voltage system (Rep. gr. 93) |
| Vehicles with start/stop system |
WARNING | Injury risk due to automatic engine start (vehicles with start/stop system). |
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| On vehicles with an activated start/stop system (indicated by a message in the instrument cluster display), the engine may start automatically on demand. |
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| Therefore, please make sure that the start/stop system is deactivated when performing repair work on the vehicle (switch off the ignition, and switch it on again if required). |
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| Components of refrigerant circuit → Chapter |
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| Layout of components of refrigerant circuit and their influence on high-pressure and low-pressure sides → Chapter |
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| Connections for quick-release coupling in refrigerant circuit → Chapter |
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| Switches and senders in refrigerant circuit and related connections → Chapter |
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| Electrical components not installed in refrigerant circuit → Chapter |
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| Pressures and temperatures in refrigerant circuit → Chapter |
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| Tests and measurements performed with pressure gauge → Chapter |
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| Air conditioner service and recycling units → Chapter |
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| Repair notes for refrigerant circuit → Chapter |
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