Volkswagen Golf / Golf GTI / Jetta. Manual — part 235

24-194

A/C compressor signal,
checking

Special tools, materials and
equipment

Note:

All functions which could previously
be performed with VAG 1551/1552
can also be performed with the VAS
5051.

VAG 1551 Scan tool (or VAG

1552) with VAG 1551/3 adapter
cable

VAG 1526 or Fluke 83 Hand

multimeter or VAG 1715
multimeter

VAG 1594 Adapter set

VAG 1598/31 test box

Electrical Wiring Diagrams

Additional signals, checking

24-195

Test requirements

The fuses must be OK.

The battery voltage must be at

least 11.5 V.

All electrical accessories, e.g.

lights and rear window defroster
must be switched off.

Selector lever must be in

position "P" or "N" on vehicles
with an automatic transmission.

Air conditioner functioning OK.

Air conditioner must be turned

off.

Vehicle at room temperature

(warmer than + 15 C).

No Diagnostic Trouble Code

(DTC)s must be stored in DTC
memory

Page 01-23

.

Additional signals, checking

24-196

Test sequence

- Connect VAG 1551 Scan tool (or VAG 1552)

and select engine electronics control module
with "Address word" 01. Engine must be running
at idle speed: ((VAG 1551 and Motronic Engine
Control Module (ECM) -J220-, connecting and
selecting

Page 01-12

).

Rapid data transfer

HELP

Select function XX

Indicated on display:

- Press buttons -0- and -8- for function "Read

measured value (data) block" and confirm entry
with -Q- button.

Read measured value block

Input display group number XXX

Indicated on display:

- Press buttons -0-, -5- and -0- for "Display group

number 50" and confirm entry with -Q- button.

Read measured value block 50

1

2

3

4

Indicated on display: (1 to 4

display zones)

- Check displays in display zones 3 and 4:

Indicated in display zone 3:

A/C-Low

Indicated in display zone 4:

Compr. OFF

Additional signals, checking

24-197

- Switch on air conditioning system.

- 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.

- Press

button.

- Press buttons -0- and -6- for function "End

output" and confirm entry with -Q- button.

- Switch off ignition.

If the displays do not change as described:

- Remove wiper arms and cowl panel:

Repair Manual, Electrical Equipment; Repair

Group 92

Additional signals, checking