Which wires to jump to test AC pressure switch?

There are 3 conductors. Which ones do I need to jump?

I don’t remember there colors off hand. If you can take a picture. Or if you have a vag Com you can do a out put test that should help test that switch.

I need to get one.

Even an AC diagram for the car would be helpful right now.

I installed the new switch and it didn’t help. Still blows warm.

I also had a friend evac and charge the system with the correct amount. No dice.

Any ideas? The compressor is not running at all.

The first big thing is to check and see if there are any codes. You can also try to jump the compressor and test it there too Those compressor units fail very easily. It’s a common failure. You didn’t pull the AC at any point in the last 8 months did you.

I had the codes pulled BUT - I had been pulling fuses when troubleshooting, so I don’t know which codes are legit and which of them I actually caused during testing.

Saturday,21,March,2015,07:31:44:09152

VCDS – Windows Based VAG/VAS Emulator

VCDS Version: 14.10.2.0

Data version: 20150311

www.Ross-Tech.com

VIN: WUARU78E77N900334 License Plate:

Mileage: 102670km-63796mi Repair Order:



Chassis Type: 8E (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))

Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65

      67 69 75 76 77

VIN: WUARU78E77N900334 Mileage: 102670km-63796miles


Address 01: Engine Labels: 079-910-560-BNS1.lbl

Part No SW: 8E1 910 560 A HW: 8E1 907 560

Component: 4.2L V8/4V FSI ª0060

Revision: --H09— Serial number: XXXXXXXXXXXXXX

Coding: 01040009180F0160

Shop #: WSC 05927 444 85878

VCID: 24475904E7F83F012A7-8071

3 Faults Found:

049508 - No Communications with HVAC Control Module (J301)

           U0164 - 008 -  - Intermittent

         Freeze Frame:

                Fault Status: 00101000

                Fault Priority: 0

                Fault Frequency: 1

                Reset counter: 255

                Mileage: 102335 km

                Time Indication: 0



         Freeze Frame:

                RPM: 776 /min

                Load: 20.0 %

                Speed: 0.0 km/h

                Temperature: 94.0°C

                Temperature: 42.0°C

                Absolute Pres.: 1010.0 mbar

                Voltage: 13.716 V

005634 - Power Supply Terminal 30

           P1602 - 002 - Voltage too Low - Intermittent

         Freeze Frame:

                Fault Status: 00100010

                Fault Priority: 0

                Fault Frequency: 1

                Reset counter: 255

                Mileage: 0 km

                Time Indication: 0



         Freeze Frame:

                RPM: 0 /min

                Load: 0.0 %

                Speed: 0.0 km/h

                Temperature: -40.0°C

                Temperature: -40.0°C

                Absolute Pres.: 0.0 mbar

                Voltage: 0.000 V

006435 - Please Check DTC Memory of ECU Number 2

           P1923 - 008 - 

         Freeze Frame:

                Fault Status: 01101000

                Fault Priority: 0

                Fault Frequency: 1

                Reset counter: 255

                Mileage: 102673 km

                Time Indication: 0



         Freeze Frame:

                RPM: 0 /min

                Load: 0.0 %

                Speed: 0.0 km/h

                Temperature: 90.0°C

                Temperature: 66.0°C

                Absolute Pres.: 1010.0 mbar

                Voltage: 11.938 V

Readiness: 0000 0000


Address 03: ABS Brakes Labels: 8E0-910-517.clb

Part No SW: 8E0 910 517 G HW: 8E0 614 517 BD

Component: ESP8 quattro H06 0150

Revision: 00000000 Serial number: 00000000000000

Coding: 0004533

Shop #: WSC 06335 000 00000

VCID: 2B55B2388A26F079EBD-807E

1 Fault Found:

01826 - Sensor for Steering Angle (G85); Supply Voltage Terminal 30

        000 -  -  - Intermittent

         Freeze Frame:

                Fault Status: 00100000

                Fault Priority: 3

                Fault Frequency: 4

                Reset counter: 37

                Time Indication: 0



         Freeze Frame:

                Hex Value: 0x0000

                Hex Value: 0x4202

                Hex Value: 0x0024

                Hex Value: 0x018C

                Hex Value: 0x0001

Address 08: Auto HVAC Labels: 8E0-820-043.lbl

Part No: 8E0 820 043 BM

Component: A4 Klimaautomat 2833

Coding: 00000

Shop #: WSC 00000

VCID: 6DD17C2027B23E49B59-5124

No fault code found.


Address 09: Cent. Elect. Labels: 8E0-907-279-8EC.lbl

Part No: 8E0 907 279 N

Component: int. Lastmodul USA 0907

Coding: 01023

Shop #: WSC 65536

VCID: 3D718C6037526EC9459-4AEA

No fault code found.


Address 0F: Digital Radio Labels: 8E0-035-593-XM.lbl

Part No SW: 8E0 035 593 E HW:

Component: SDAR XM

Revision: Serial number: AUZ4Z7F6045940

Shop #: WSC 00000 000 00000

VCID: 2B55B2388926F079EBD-515E

1 Fault Found:

02635 - Tuner Not Enabled/Activated

        000 -  - 

Address 11: Engine II Labels: 079-910-560-BNS2.lbl

Part No SW: 8E1 910 560 A HW: 8E1 907 560

Component: 4.2L V8/4V FSI ª0060

Revision: --H09— Serial number: XXXXXXXXXXXXXX

Coding: 01040009180F0160

Shop #: WSC 05927 444 85878

VCID: 24475904E7F83F012A7-8071

2 Faults Found:

049508 - No Communications with HVAC Control Module (J301)

           U0164 - 008 -  - Intermittent

         Freeze Frame:

                Fault Status: 00101000

                Fault Priority: 0

                Fault Frequency: 1

                Reset counter: 255

                Mileage: 102335 km

                Time Indication: 0



         Freeze Frame:

                RPM: 779 /min

                Load: 20.0 %

                Speed: 0.0 km/h

                Temperature: 94.0°C

                Temperature: 42.0°C

                Absolute Pres.: 1010.0 mbar

                Voltage: 13.716 V

005634 - Power Supply Terminal 30

           P1602 - 002 - Voltage too Low - Intermittent

         Freeze Frame:

                Fault Status: 00100010

                Fault Priority: 0

                Fault Frequency: 1

                Reset counter: 255

                Mileage: 0 km

                Time Indication: 0



         Freeze Frame:

                RPM: 0 /min

                Load: 0.0 %

                Speed: 0.0 km/h

                Temperature: -40.0°C

                Temperature: -40.0°C

                Absolute Pres.: 0.0 mbar

                Voltage: 0.000 V

Address 15: Airbags Labels: 8E0-959-655-94.lbl

Part No SW: 8E0 959 655 H HW: 8E0 959 655 H

Component: Airbag 9.41 H12 3840

Revision: 91H12384 Serial number: 0036N001W1XD

Coding: 0432607

Shop #: WSC 06335 000 00000

VCID: 3C7781647F4867C1727-8069

Subsystem 1 - Part No: 8E0 910 339 B

Component: BF-Gewichtsens. 002 0070

Subsystem 2 - Serial number: 36TC8

Subsystem 3 - Serial number: 0001.01.000000200000000000ÿ†63

Subsystem 4 - Serial number: 000000ÿ†6332DRB4030B890DRÿ†63

Subsystem 5 - Serial number: B890DRÿ†6342DRB4030A1292Bÿ†63

Subsystem 6 - Serial number: A1292Bÿ†6352ARB4012C8621Eÿ†63

Subsystem 7 - Serial number: C8621Eÿ†6362ARB4012CB733Mÿ†63

Subsystem 8 - Serial number: CB733Mÿ†63729RB401201CF2Gÿ†63

Subsystem 9 - Serial number: 01CF2Gÿ†63829RB401201CF5Kÿ

Subsystem 10 - Serial number: 01CF5Kÿ

No fault code found.


Address 16: Steering wheel Labels: 8E0-953-549-T.lbl

Part No: 8E0 953 549 T

Component: Lenksáulenmodul 0201

Coding: 04441

Shop #: WSC 06335

VCID: 4487F98454B81F010A7-4AEA

1 Fault Found:

01304 - Radio

        49-10 - No Communications - Intermittent

Address 17: Instruments Labels: 8E0-920-9xx-8EC.lbl

Part No SW: 8E0 920 981 S HW: 8E0 920 981 S

Component: KOMBI+WFS 4 H14 0040

Revision: 0040 Serial number: 00000000000000

Coding: 0023261

Shop #: WSC 05927 444 82792

VCID: 3D718C6067526EC9459-5124

3 Faults Found:

00779 - Outside Air Temp Sensor (G17)

        010 - Open or Short to Plus - Intermittent

01320 - Control Module for Climatronic (J255)

        004 - No Signal/Communication - Intermittent

01304 - Radio

        004 - No Signal/Communication - Intermittent

Address 25: Immobilizer Labels: 8E0-920-9xx-8EC.lbl

Part No SW: 8E0 920 981 S HW: 8E0 920 981 S

Component: KOMBI+WFS 4 H14 0040

Revision: 0040 Serial number: 00000000000000

Coding: 0023261

Shop #: WSC 05927 444 82792

VCID: 3D718C6067526EC9459-5124

3 Faults Found:

00779 - Outside Air Temp Sensor (G17)

        010 - Open or Short to Plus - Intermittent

01320 - Control Module for Climatronic (J255)

        004 - No Signal/Communication - Intermittent

01304 - Radio

        004 - No Signal/Communication - Intermittent

Address 36: Seat Mem. Drvr Labels: 8E0-959-760.lbl

Part No: 8E0 959 760

Component: Sitzmemory R2 F 0305

Coding: 00002

Shop #: WSC 00000

VCID: 71E960503B8ADAA9911-4AEA

No fault code found.


Address 37: Navigation Labels: 8E0-035-192-RNSE.lbl

Part No SW: 8E0 035 192 J HW: 8E0 035 192 J

Component: RNS-E US3 H72 0110

Revision: 03S Serial number: AUZBZ7F2442448

Coding: 0309637

Shop #: WSC 06335 000 00000

VCID: 2B55B2388926F079EBD-515E

5 Faults Found:

00532 - Supply Voltage B+

        002 - Lower Limit Exceeded - Intermittent

         Freeze Frame:

                Fault Status: 00100010

                Fault Priority: 7

                Fault Frequency: 1

                Reset counter: 60

                Time Indication: 0

                Date: 2013.03.20

                Time: 00:43:35



         Freeze Frame:

                Voltage: 12.30 V

00446 - Function Limitation due to Under-Voltage

        002 - Lower Limit Exceeded - Intermittent

         Freeze Frame:

                Fault Status: 00100010

                Fault Priority: 7

                Fault Frequency: 1

                Reset counter: 60

                Time Indication: 0

                Date: 2013.03.19

                Time: 23:56:29



         Freeze Frame:

                Voltage: 10.70 V

                Mileage: 655350 km

                Count: 2708

                Clock: 11:19

00857 - CD Changer Unit (R41)

        004 - No Signal/Communication - Intermittent

         Freeze Frame:

                Fault Status: 00100100

                Fault Priority: 5

                Fault Frequency: 10

                Reset counter: 59

                Time Indication: 0

                Date: 2005.08.26

                Time: 00:29:27

01316 - ABS Control Module

        004 - No Signal/Communication - Intermittent

         Freeze Frame:

                Fault Status: 00100100

                Fault Priority: 5

                Fault Frequency: 12

                Reset counter: 58

                Time Indication: 0

                Date: 2010.03.24

                Time: 18:31:29



         Freeze Frame:

                Bin. Bits:     0000

                Mileage: 655350 km

                Count: 1602

                Clock: 07:40

01305 - Databus for Infotainment

        004 - No Signal/Communication - Intermittent

         Freeze Frame:

                Fault Status: 00100100

                Fault Priority: 5

                Fault Frequency: 3

                Reset counter: 60

                Time Indication: 15

Address 46: Central Conv. Labels: 8E0-959-433-MAX.lbl

Part No: 8E0 959 433 CG

Component: Komfortgerát T7B 4035

Coding: 11884

Shop #: WSC 06335

VCID: 78FF5D7458F08BE156F-4AEA

Subsystem 1 - Part No: 8E1959801G

Component: Tõrsteuer.FS BRM 0706

Subsystem 2 - Part No: 8E1959802G

Component: Tõrsteuer.BF BRM 0706

Subsystem 3 - Part No: 8E0959801E

Component: Tõrsteuer.HL BRM 0606

Subsystem 4 - Part No: 8E0959802E

Component: Tõrsteuer.HR BRM 0606

5 Faults Found:

01320 - Control Module for Climatronic (J255)

        49-10 - No Communications - Intermittent

00962 - Alarm via. Tilt Sensor

        35-00 -  - 

01374 - Alarm triggered by Terminal 15

        35-00 -  - 

01371 - Alarm triggered by Door Contact Switch; Driver’s Side

        35-00 -  - 

00956 - Key 2

        35-10 -  -  - Intermittent

Address 55: Headlight Range Labels: 4F0-910-357.lbl

Part No SW: 4F0 910 357 F HW: 4F0 907 357 F

Component: AFS 1 H01 0020

Revision: 00000001 Serial number:

Coding: 0000019

Shop #: WSC 05127 444 87830

VCID: 2959483080DAE269191-807C

Subsystem 1 - Part No: 8E0 941 329

Component: AFS-Modul links H03 0020

Subsystem 2 - Part No: 8E0 941 329

Component: AFS-Modul rechtsH03 0020

1 Fault Found:

02233 - Left Headlight Power Output Stage (J667)

        004 - No Signal/Communication - Intermittent

         Freeze Frame:

                Fault Status: 00100100

                Fault Priority: 2

                Fault Frequency: 8

                Reset counter: 29

                Time Indication: 0

Address 56: Radio Labels: 8E0-035-192-RNSE.lbl

Part No SW: 8E0 035 192 J HW: 8E0 035 192 J

Component: RNS-E US3 H72 0110

Revision: 03S Serial number: AUZBZ7F2442448

Coding: 0309637

Shop #: WSC 06335 000 00000

VCID: 2B55B2388926F079EBD-515E

5 Faults Found:

00532 - Supply Voltage B+

        002 - Lower Limit Exceeded - Intermittent

         Freeze Frame:

                Fault Status: 00100010

                Fault Priority: 7

                Fault Frequency: 1

                Reset counter: 60

                Time Indication: 0

                Date: 2013.03.20

                Time: 00:43:35



         Freeze Frame:

                Voltage: 12.30 V

00446 - Function Limitation due to Under-Voltage

        002 - Lower Limit Exceeded - Intermittent

         Freeze Frame:

                Fault Status: 00100010

                Fault Priority: 7

                Fault Frequency: 1

                Reset counter: 60

                Time Indication: 0

                Date: 2013.03.19

                Time: 23:56:29



         Freeze Frame:

                Voltage: 10.70 V

                Mileage: 655350 km

                Count: 2708

                Clock: 11:19

00857 - CD Changer Unit (R41)

        004 - No Signal/Communication - Intermittent

         Freeze Frame:

                Fault Status: 00100100

                Fault Priority: 5

                Fault Frequency: 10

                Reset counter: 59

                Time Indication: 0

                Date: 2005.08.26

                Time: 00:29:27

01316 - ABS Control Module

        004 - No Signal/Communication - Intermittent

         Freeze Frame:

                Fault Status: 00100100

                Fault Priority: 5

                Fault Frequency: 12

                Reset counter: 58

                Time Indication: 0

                Date: 2010.03.24

                Time: 18:31:29



         Freeze Frame:

                Bin. Bits:     0000

                Mileage: 655350 km

                Count: 1602

                Clock: 07:40

01305 - Databus for Infotainment

        004 - No Signal/Communication - Intermittent

         Freeze Frame:

                Fault Status: 00100100

                Fault Priority: 5

                Fault Frequency: 3

                Reset counter: 60

                Time Indication: 15

Address 65: Tire Pressure Labels: 8E0-907-273.lbl

Part No SW: 8E0 907 273 HW: 8E0 907 273

Component: Reifendruck 3 H04 0110

Coding: 0062523

Shop #: WSC 02197 785 00200

VCID: 69D90830435A2269D91-5124

No fault code found.


Address 76: Park Assist Labels: 8E0-919-283-8EC.lbl

Part No SW: 8E0 919 283 D HW: 8E0 919 283 D

Component: Parkhilfe 4-Kan H06 0010

Revision: 00H06000 Serial number: 00067802020611

Coding: 0000304

Shop #: WSC 06335 000 00000

VCID: 3169A050AB0A9AA9D11-5124

No fault code found.


Address 77: Telephone Labels: 8P0-862-335.lbl

Part No SW: 8P0 862 335 G HW: 8P0 862 335 G

Component: FSE_255x BT H21 0190

Revision: 00000001 Serial number: 00000000435763

Coding: 0011877

Shop #: WSC 06335 000 00000

VCID: 3A7B877C767C59F160B-5124

1 Fault Found:

01304 - Radio

        004 - No Signal/Communication - Intermittent

         Freeze Frame:

                Fault Status: 00100100

                Fault Priority: 5

                Fault Frequency: 1

                Reset counter: 157

                Time Indication: 15

End-------------------------(Elapsed Time: 07:21)--------------------------

Could these stop the AC from working all together?

00779 - Outside Air Temp Sensor (G17)

        010 - Open or Short to Plus - Intermittent

01320 - Control Module for Climatronic (J255)

        004 - No Signal/Communication - Intermittent

FYI - my external temperature still displays on the gauges.

Jeff the codes you posted above would have some issues on the system working. But you said you pulled fuses. I would clear the codes and just check the HVAC codes. You can also do an output test in the HVAC module in vag Com. If you have issues figuring out how to do that let me know. I can walk you through that.

Thanks man - The problem is that I had a bud scan it for me. I don’t own a cable. I need to…

Nooowwww… my econ light stays on. Crazy. Waiting on a control module that I ordered.

Oh man. I don’t think it’s the module. The economy light just kinda raferms that.

Who knows… I had already ordered the module when the econ light was not coming on.

What does the Econ light usually mean for you guys?

It’s not the module your compressor is probably shot. The econ light generally comes on when the system isn’t working correctly. It can be compressor or fluid related.

I did a little more work with the vag-com. Looked like I had 1bar pressure on the AC system, which from reading online means it’s empty. I put the same crappy can (with gauge) on it and sure enough, it was way way low/emptyish. I went ahead and added enough so that vcds showed an increase. I checked it the next day and it was back to 1bar. I guess I might have “created” a leak by over pressurizing the system. Going to take it to a shop tomorrow to get sniffed.

That’s very possible. Let us know what you find. Usually they do a smoke test on AC systems. It works best.

He couldn’t get the compressor to kick in even after charging. He said that it’s throwing a code for the AC control module. I find it hard to believe that adding a little gas killed the module AND caused a leak.

He’s a well-known BMW Mercedes mechanic but doesn’t specialize in Audi. He sent the car home broken but didn’t charge me anything.

So I DO have this other AC module that I bought off ebay just in case… What is involved in recoding it? Any chance it will work correctly without recoding?

I’m with you. The module could have exploded but that wouldn’t cause a leak in the AC system. You could have two separate issues but I doubt that. The AC module isn’t a part you hear of going bad. You should be able too grab the coding from vagcom and just copy that code over if needed to too he new unit. You shouldn’t have to oleo recode it as long as it’s from the same body type.

Also it’s not helping that he didn’t give you too he one he actual codes. What’s the fault code in the module

I’m guessing it was this:

01320 - Control Module for Climatronic (J255)

        004 - No Signal/Communication - Intermittent

Also - is there a separate compressor relay - and if so, where is it found?