| Vehicles with a high-voltage system (hybrid vehicles) |
WARNING | Danger from unexpected engine starting |
| When performing general work on vehicles with a high-voltage system, switch off the ignition and remove the ignition key from the passenger compartment. |
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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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| Vehicles with start/stop system |
WARNING | Risk of injury due to automatic starting of engine on vehicles with a start/stop system. |
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| The engine may start automatically if required on vehicles with an activated start/stop system (indicated in the dash panel insert). |
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| When working on the vehicle it should thus be ensured that the start/stop system has been deactivated (switch off ignition, switch on again if necessary). |
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WARNING | Remove the appropriate fuse(s) before working on wiring. |
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Note | Disconnect the battery -A-, the second battery -A1- and the drive battery -A2- before starting electric welding work on the vehicle. → Electrical system; Rep. gr.27 |
| It is only permissible if so required by the pertinent safety regulations → Chapter, or if parts of the air conditioner refrigerant circuit have to be replaced, to drain and open the air conditioner refrigerant circuit → Chapter (draining refrigerant circuit). |
| The air conditioner refrigerant circuit must remain closed during all other normal vehicle repair operations. |
| This Workshop Manual describes the servicing work which can be performed on the heater and air conditioner without opening the refrigerant circuit → Chapter (refrigerant circuit servicing work), → Chapter (components for control and regulation of air conditioner not located in passenger compartment) and → Chapter (components for control and regulation of air conditioner located in passenger compartment). |
Note | The connections for the senders/switches described in this Workshop Manual are fitted with a valve which closes automatically when the switches are unscrewed. These switches can therefore be replaced at any VW/Audi workshop without draining the refrigerant circuit. |
| Air conditioner service work for which the refrigerant circuit has to be drained and which therefore cannot be performed at all VW/Audi workshops is described as of → Chapter (servicing refrigerant circuit). Draining of the refrigerant circuit requires the use of specific tools and such work is also only to be performed by qualified personnel. For this reason, it may be necessary to take the vehicle to a workshop equipped with the necessary tools where the work can be performed by appropriately qualified personnel → Air conditioner with refrigerant R134a. |
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| Checking of electrical air conditioner components actuated or evaluated by way of other control units → Chapter. |
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| Checking of electrical components actuated by the air conditioner → Chapter. |
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