Mk4 Jetta ac schematic

   #1  

WheelerKB

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I am trying diagnose an ac compressor not kick on issue on a 2002 Jetta 1.8t. I have put about two cans of r134a in the car but the compressor will not kick on unless I hard wire ground to the compressor. I think I have a circuit problem that I could diagnose if I had a schematic. So, I am asking for advice or a schematic.

Thanks
 
   #3  

WheelerKB

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That is a pay site to get access to the schematics, right?

Here is the auto scan.

Code:
Chassis Type:1J or 9M
Scan: 01 02 03 08 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57 75
	 76



-----------------------------------------------------------------
Address 01: Engine	Labels: 06A-906-032-AWP.lbl
	Part No SW: 06A 906 032 HF	
	Component: 1.8L R4/5VT     G   0004
	Coding: 07550
	Shop #: WSC 00066 000
	VCID: 69952EA70236E318D90DF8-5184

	Subsystem 1 - 	Part No SW: 3VW-SE6-9MX-2M0
	Component: 21079    VWZ7Z0A3852785

No fault codes found.
-----------------------------------------------------------------
Address 02: Auto Trans	Labels: 09A-927-750.lbl
	Part No SW: 09A 927 750 T	
	Component: AG5 Getriebe 09A   0162 
	Shop #: WSC 00000 000
	VCID: 3C3BA7F33D24A6B0724BE9-5184

2 Faults Found:
00258 - Solenoid Valve 1 (N88)
	30-10 - Open or Short to Plus - Intermittent

00350 - Ground (GND) Feedback for Modulation Valves
	38-10 - Output won't Switch or Short to Plus - Intermittent

-----------------------------------------------------------------
Address 03: ABS Brakes	Labels: 1C0-907-37x-ASR.lbl
	Part No SW: 1C0 907 379 D	
	Component: ASR FRONT MK60       0103
	Coding: 0018945
	Shop #: WSC 00066 000 00000
	VCID: 2B1994AFC84A2108EBA1A2-5184

No fault codes found.
-----------------------------------------------------------------
Address 15: Airbags	Labels: 6Q0-909-605-VW5.lbl
	Part No SW: 6Q0 909 605	
	Component: 04 AIRBAG VW6  0202 0004
	Coding: 12340
	Shop #: WSC 00066 000
	VCID: F4ABCFD3D5F4AEF0FA9B01-4B3C

No fault codes found.
-----------------------------------------------------------------
Address 16: Steering wheel	Labels: 1J0-907-487.lbl
	Part No SW: 1J0 907 487 B	
	Component: Lenkradelektronik   0002
	Coding: 00008
	Shop #: WSC 00066 000
	VCID: 302383C3E16C52D0DEF36D-5216

No fault codes found.
-----------------------------------------------------------------
Address 17: Instruments	Labels: 1J0-920-xx5-17.lbl
	Part No SW: 1J0 920 906 N	
	Component: KOMBI+WEGFAHRSP VDO V58
	Coding: 07234
	Shop #: WSC 00000 000
	VCID: 33298CCF107A69C8A3114A-5160

	Subsystem 1 - 	Part No SW: 3VW-SE6-9MX-2M0
	Component: 21079     VWZ7Z0A3852785

No fault codes found.
-----------------------------------------------------------------
Address 19: CAN Gateway	Labels: 6N0-909-901-19.lbl
	Part No SW: 6N0 909 901	
	Component: Gateway K<->CAN    0001
	Coding: 00006
	Shop #: WSC 00066 000
	VCID: F0A3C3C3A1EC92D01E732D-5160

No fault codes found.
-----------------------------------------------------------------
Address 46: Central Conv.	Labels: 1C0-959-799.lbl
	Part No SW: 1C0 959 799 C	
	Component: 1H Komfortgerät HLO 0003
	Coding: 00258
	Shop #: WSC 00066 000
	VCID: 3731B8DF040285E89F391E-4B3C

	Subsystem 1 - 	Part No SW: 1C1-959-801-A
	Component: 1H Türsteuer.FS KLO 0002

1 Fault Found:
01359 - Internal Central Locking Switch; Passenger Side (E198)
	27-10 - Implausible Signal - Intermittent

End-------------------------(Elapsed Time: 07:49)--------------------------
 
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   #4  

Jack@European_Parts

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Yup that is the factory book...........

Thank you for posting the scan.........

How about fuses and seeing if 0x08 can be woke up?

Print to PDF on the repair manual.
 
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Uwe

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I rather doubt it has 08-HVAC. Very few US Mk.4 cars did.

-Uwe-
 
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Jack@European_Parts

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I guess a better question is, do you have climatronic or manual controls?

Check all connections.....Do fans turn on when you turn AC on in the car with ignition on?

Inspect connections under battery and underneath to the fan control unit, these like to pickup stray drained battery acid from a boiling battery, due to over charge.

Have you checked or jumped out the compressor interrupt overheat coolant switch?

Does your 1.8T support a second water pump attacked to fan shroud?

Does VCDS in adv measuring blocks see the AC switch functionality and do all fans speeds work for heater blower switch or resistor pack?
 
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   #7  

ivagp

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how about the pressure switch. and where are you applying the ground
 
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   #8  

WheelerKB

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I guess a better question is, do you have climatronic or manual controls?
Manual

Check all connections.....Do fans turn on when you turn AC on in the car with ignition on?
Yes

Inspect connections under battery and underneath to the fan control unit, these like to pickup stray drained battery acid from a boiling battery, due to over charge.
--- Will do.

Have you checked or jumped out the compressor interrupt overheat coolant switch?
No, I have not looked into this, yet.

Does your 1.8T support a second water pump attacked to fan shroud?
Yes, and it runs.

Does VCDS in adv measuring blocks see the AC switch functionality and do all fans speeds work for heater blower switch or resistor pack?
I have not checked in VCDS, I looked for it but could not find where to look for it.

Thank you!
 
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   #9  

WheelerKB

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how about the pressure switch. and where are you applying the ground

I have not checked them yet, I was hoping to see the schematic for the system so I understand and know what I'm checking. I am adding ground to the brown wire at the compressor clutch to engage the coil.
 
   #10  

WheelerKB

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I found it.. The secondary air injection solenoid and ac clutch coil connectors got swapped around.. Thank you guys!
 
   #11  

Jack@European_Parts

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I love that one FOD.........:p

Favorite is on VR6 AFP when SAI gets swapped with intake flap........

Run SAI test and flap moves........

So when you ran SAI did the compressor run and blow cold AC?
 
   #12  

WheelerKB

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When I was first getting the car up and going, I noticed the compressor clutch would kind of grab for about 2 seconds ave of for 1 second and back on occasionally... I just thought it was low I refrigerant.. I was also getting a code for SAI solenoid shorted to ground. Got the schematic from the library, and then noticed the color of eyes going to the clutch was not correct... That lead me to the cause of the problem..
 
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