Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI2005TT QUATTRO, 2D COUPE, 3.2 FREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHEATING & AIR CONDITIONING01 ON BOARD DIAGNOSTIC (OBD)AUTOMATIC CLIMATE CONTROL SYSTEM, ELECTRICAL TESTINGA/C CONTROL HEAD -E87-, ELECTRICAL TESTINGNOTES
2005 Audi TT Quattro, 2D Coupe, 3.2 F
A/C Control Head -E87-, electrical testing: Notes
2005 Audi TT Quattro, 2D Coupe, 3.2 FSECTION Notes
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
- VAG 1598 test box with VAG 1598/11 and VAG 1598/12 adapter cables
- Multimeter (Fluke 83 or equivalent)
- VW 1594 connector test kit
- VAG 1527B voltage tester (or equivalent diode type tester)
- Temperature sensor with suitable tester
Test conditions
- 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
- Switch ignition off.
- Remove A/C Control Head -E87-. Refer to A/C Control Head -E87-, removing and installing .
- Connect adapter leads VAG 1598/11 and 12 to connectors on vehicle wiring harness.
NOTE:
- Do not connect A/C Control Head -E87-.
- To carry out the measurement, connect the VAG 1598 test box to the relevant adapter lead.
- The socket assignment on VAG 1598/12 adapter corresponds exactly to the terminal assignment on the A/C Control Head -E87-.
- The socket assignment on VAG 1598 adapter does not correspond to the terminal assignment on the A/C Control Head -E87-. Refer to Socket assignment for VAG 1598 test box with adapter lead VAG 1598/11 .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.