TT Roadster L4-1.8L Turbo (AWP) (2003)
Control Assembly: Testing and Inspection
A/C Control Head -E87-, Electrical Testing
A/C Control Head -E87-, Electrical Testing
NOTE: The VAG 1598 test box and adapters must never be connected to the A/C control head -E87- while performing an on board diagnostic program
with VAG 1551/1552 Scan Tool (ST).
Special tools, testers and auxiliary items
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VAG 1598 test box with VAG 1598/11 and VAG 1598/12 adapter cables
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Multimeter (Fluke 83 or equivalent)
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VW 1594 connector test kit
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VAG 1527B voltage tester (or equivalent diode type tester)
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Temperature sensor with suitable tester
Test conditions
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All fuses OK according to wiring diagram
Connecting VAG 1598 test box to connector for A/C control head -E87- using VAG 1598 adapters 11 and 12
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Switch ignition off.
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Remove A/C control head -E87-.
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Connect adapter leads VAG 1598/11 and 12 to connectors on vehicle wiring harness.
NOTE:
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Do not connect A/C control head -E87-.
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To carry out the measurement, connect the VAG 1598 test box to the relevant adapter lead.
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The socket assignment on VAG 1598/12 adapter corresponds exactly to the terminal assignment on the A/C control head -E87-.
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The socket assignment on VAG 1598 adapter does not correspond to the terminal assignment on the A/C control head -E87-.
Socket assignment for VAG 1598 test box with adapter lead VAG 1598/11
NOTE:
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The terminal assignment for connectors A and B on the VAG 1598/11 adapter does not match the socket assignment on the test box.
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The terminal assignment for connector C on the VAG 1598/11 adapter corresponds exactly to the socket assignment on the test box.
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The terminal assignment for connector D on the VAG 1598/12 adapter corresponds exactly to the socket assignment on the test box.
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Because the connectors for the A/C control head -E87- are distributed over two adapter leads ((VAG 1598/11 and VAG 1598/12) there is no
Ground (GND) connection for testing purposes when only adapter lead VAG 1598/11 is connected. Therefore, for various steps of the electrical
test it is necessary to use a suitable Ground (GND) point on the body of the car, or to use a second VAG 1598 test box. With the VAG 1598/12
adapters the Ground (GND) connection is through terminal 15.)