Checking air conditioner components on vehicles with high-voltage system — AUDI

Checking air conditioner components on vehicles with high-voltage system
Hybrid vehicles
Air conditioner (and refrigerant circuit) components which are identical on vehicles with and without a high-voltage system can be checked, removed and installed as described for vehicles with no high-voltage system (e.g. the control motors on the air conditioning unit)
Vehicle diagnostic, testing and information system VAS 5051 ("Guided Fault Finding" for air conditioner)
.
Air conditioner components which are largely identical on vehicles with and without a high-voltage system, but which may differ for example in terms of their function, can be checked, removed and installed as described for vehicles with no high-voltage system (e.g. air conditioner operating and display unit,
Climatronic control unit
J255
)
Electronic parts catalogue
and
Vehicle diagnostic, testing and information system VAS 5051 ("Guided Fault Finding" for air conditioner)
.
Air conditioner (and refrigerant circuit) components which differ on vehicles with and without a high-voltage system (e.g. the
electrical air conditioner compressor
V470
with the
control unit for air conditioning compressor
J842
) should be checked, removed and installed as described for vehicles with a high-voltage system (e.g.
J842
with address word
“40”
)
Vehicle diagnostic, testing and information system VAS 5051 ("Guided Fault Finding")
. The
control unit for air conditioning compressor
J842
(and thus the
electrical air conditioner compressor
V470
) are supplied with power by the
power and control electronics for electric drive
JX1
. Therefore
JX1
(address word
“51”
) must also be checked if there is a problem
Vehicle diagnostic, testing and information system VAS 5051 ("Guided Fault Finding")
and
Current flow diagrams, Electrical fault finding and Fitting locations
.
Air conditioner (and refrigerant circuit) components only fitted on vehicles with a high-voltage system (e.g. the electrical components of the battery cooling module, the
refrigerant shut-off valve 1 for hybrid battery
N516
and the
refrigerant shut-off valve 2 for hybrid battery
N517
) are removed and installed as described for vehicles with a high-voltage system. These components are not activated directly by the air conditioner operating and display unit (
Climatronic control unit
J255
). They are activated e.g. via the
battery regulation control unit
J840
(with address word
“8C”
)
Vehicle diagnostic, testing and information system VAS 5051 ("Guided Fault Finding")
and
Current flow diagrams, Electrical fault finding and Fitting locations
.
For all work on vehicles with a high-voltage system, note the additional warning instructions for working on such vehicles
Chapter
and
Electrical system
Rep. gr.
93
General warning instructions for work on the high-voltage system
.
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.
WARNING
Working on vehicles with high-voltage wiring:
Do not support yourself or tools on high-voltage wiring or associated components --> this can damage the insulation.
High-voltage wiring must not be excessively bent or kinked --> this can damage the insulation.
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.
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:
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.
Before starting work, visually inspect the high-voltage components in the areas involved.
Before working in the engine compartment, visually inspect the
power and control electronics for electric drive
JX1
,
electric drive motor
V141
,
air conditioner compressor
V470
and high-voltage wiring.
Before working on the vehicle underbody, visually inspect the high-voltage wiring and covers.
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
.
Visually inspect all potential equalisation lines.
Check the following when making the visual inspection:
There must be no external damage on any component.
The insulation of the high-voltage wiring and potential equalisation lines must not be damaged.
There must be no unusual deformation of the high-voltage wiring.
All high-voltage components must be identified by a red warning sticker.
To minimise the number of automatic engine starts when the vehicle's drive system is active (READY) during test and measurement work, charge the vehicle batteries e.g. with the
battery charger 60A
VAS 5904
in battery standby mode
Electrical system
Rep. gr.
27
Battery; Charging battery
and
Electrical system
Rep. gr.
93
General warning instructions for work on the high-voltage system
.
Activate vehicle drive system (with ignition switched on, check "READY" display in
control unit in dash panel insert
J285
).
Note
The status of the drive system (READY) is shown by the
control unit in dash panel insert
J285
via the
“power meter”
.
Activating vehicle drive system (check "READY" display in
control unit in dash panel insert
J285
)
Owner's Manual
Also move the selector lever to position
“P”
and activate the parking brake before performing test and measurement work for which the ignition must be switched on but where the vehicle's drive system does not need to be active (READY).