SEAT Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
• ◆ Test box V.A.G 1598/18
• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594
• ◆ Current flow diagram

Check conditions

• ● Function of air conditioner OK.
• ● Air conditioner switched off
• ● Interior of vehicle has room temperature (above 15 ° C)
• ● No faults stored in fault memory
  , interrogating fault memory

Test sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and with the "Address word" 01 select the engine electronics control unit. When doing this the engine should be idling.
  (Connecting fault reader and selecting engine electronics control unit => Page 01-4.)

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0 and 1 for "Display group number 01" and confirm entry with Q key.

• ‒ Observe display zone 4 -8 digit number block-:

• 3rd position from left must display zero
      Display 00000000

• ‒ Switch on air conditioner (lowest temperature and highest blower speed).

Note:

Air conditioner compressor must audibly switch on.

• 3rd position from left must now display 1
      Display 00100000

If the display does not indicate as described:

• ‒ Remove dash panel insert.

=> Electrical system; Repair group 90

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
• ‒ Check wiring between test box sockets 13 and 39 and air conditioner for open circuit according to current flow diagram.
      Wire resistance: Max. 1.5 ω