Jetta V6-2.8L (BDF) (2002)
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Press buttons -0- and -8- for function "Read measured value (data) block" and confirm entry with -Q- button.
Indicated on display:
Read measured value block
Input display group number XXX
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Press buttons -0-, -5- and -0- for "Display group number 50" and confirm entry with -Q- button.
Indicated on display: (1 to 4 = display zones)
Read measured value block 50
1
2
3
4
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Check displays in display zones 3 and 4:
Indicated in display zone 3:
A/C-Low
Indicated in display zone 4:
Compr. OFF
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Switch on air conditioning system.
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Select lowest temperature and highest blower speed.
The display in display zone 3 must change to:
A/C-High.
The display in display zone 4 must change to:
Compr. ON.
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Press the -> button.
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Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
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Switch off ignition.
If the displays do not change as described:
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Remove wiper arms and cowl panel:
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Connect VAG 1598/31 test box to control module wiring harness. The Motronic Engine Control Module (ECM) -J220- remains disconnected.
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Check wiring for open circuit between test box sockets 40 and 41 and air conditioning system referring to Electrical Wiring Diagrams. Wire
resistance: max. 1.5 ohms
If no malfunctions can be found in the wiring:
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Check function of air conditioning system.
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Check DTC memory, repair malfunctions if necessary and then erase DTC memory.
See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes
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Read readiness code. If the DTC memory has been erased or the Motronic Engine Control Module (ECM) -J220- was disconnected from battery
positive (B+), the readiness code must be generated again.