Checking signal from/to air conditioning system — VW

🧭 Before you start

Fits: platform code 6N1

Don't miss

• Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". Engine must be idling. (Connecting fault reader and selecting engine electronics control unit .)
• Observe display in display zone 3, the air conditioner must not be switched on.

🔧 Engine codes this applies to

📐 41 workshop diagrams for AMF

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". Engine must be idling. (Connecting fault reader and selecting engine electronics control unit .)
2. Press buttons 0 and 3 for function "“final control diagnosis”".
3. Confirm entry with Q button.
4. Press the → button.
5. Proceed with final control diagnosis until completed.

6. Press buttons 0 and 6 for function "“End data transfer”" and confirm entry with Q button.
7. Connect adapter cable, 121-pinV.A.G 1598/31 to control unit wiring harness.
8. Check wiring between adapter cable, 121-pinV.A.G 1598/31 socket 29 and air conditioning for open circuit according to current flow diagram.
9. Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". Engine must be idling. (Connecting fault reader and selecting engine electronics control unit .)
10. Press buttons 0 and 8 for function "“Read measured value block”" and confirm entry with Q button.
11. Press buttons 0, 0 and 2 for "“display group number 2”" and confirm entry with Q button.
12. Observe display in display zone 3, the air conditioner must not be switched on.
13. Switch on air conditioning system. Do this, depending on air conditioning system installed by pressing switch "“AC”" on a manually controlled air conditioning system or pressing switch "“Auto”" on an automatic (Climatronic) air conditioning system.
14. Select lowest temperature and highest blower speed. The air conditioner compressor should run.
15. Observe display in display zone 3.
16. Connect adapter cable, 121-pinV.A.G 1598/31 to control unit wiring harness.
17. Check wiring between adapter cable, 121-pinV.A.G 1598/31 socket 34 and air conditioning for open circuit according to current flow diagram.

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