Audi Q7 e-tron quattro 4M - Page 77

77
Key components
Thermal management control unit J1024
High-voltage heater (PTC) Z115
The control unit J1024 co-ordinates the requirements of the
components newly added due to the heat pump and the subsys-
tems, and, where possible, sets the energetically most favourable
operating points. It is installed under the right wing. The control
unit is connected to the data bus diagnostic interface J533 via the
hybrid CAN data bus.
To narrow down the possible cause of a malfunction, various
routines have been stored in the basic setting of control unit J1024
and include the following functions:
• Cool air conditioning system
• Heat pump
• Cool components of the high-voltage system
• Guided Fault Finding
The thermal management control unit J1024 communicates with
the following control units.
• Battery regulation control unit J840
• Electric drive control unit J841
• Air conditioner/Climatronic operating and display unit E87
• Engine control unit J623
Depending on requirements, control unit J1024 selects the best
out of over 200 possible shift states. In addition, the thermal
management control unit J1024 reads in signals from the tem-
perature and pressure sensors and controls pumps as well as
valves.
The high-voltage heater (PTC) Z115 heats the coolant for the
heater heat exchanger in the cabin, both in electric drive mode and
when preheating the vehicle. The high-voltage line is installed in
the plenum chamber.
The high-voltage heater (PTC) Z115 is used when the heating
output of the heat pump is not sucient to heat the cabin.
649_031
649_032
Reference
For further information about the high-voltage heater (PTC) Z115, refer to Self Study Programme650
"AudiQ7e-tronquattro(type4M) high-voltage system and vehicle electrics".
Coolant connections
Connection to 12-volt
electrical system
High-voltage cable
connection
Selector lever sensors
High-voltage heater (PTC)
J848
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