With the correct harness you should be able to wire it up assuming you know
the Vanagon wiring layout (very simple).  I found the following on the web.

P O W E R / O E M C O L O R / S T A N D A R D

Battery / Memory Red Yellow
Ignition / Accessory Fuse Box Red
Ground Brown Black
Power Antenna White Blue
Amplifier Turn On N/A Blue / White
Illumination Gray / Blue Orange
Dimmer N/A Orange / White

S P E A K E R S O E M C O L O R S T A N D A R D
Front / Right + Red Gray
Front / Right - Brown / White Gray / Black

Front / Left + Blue White
Front / Left - Brown / White White / Black

Rear / Right + Red Purple
Rear / Right - Brown / White Purple / Black

Rear / Left + Blue Green
Rear / Left - Brown / Blue Green / Black

(typical of late 90’s models)

Right Rear Speaker (+) Blue
Right Rear Speaker (-) Tan w/ Blue Stripe
Right Front Speaker (+) Red Gray
Right Front Speaker (-) Tan w/ Red Stripe
Left Front Speaker (+) Blue w/ White Stripe
Left Front Speaker (-) Tan w/ White Stripe
Left Rear Speaker (+) Red w/ Green Stripe
Left Rear Speaker (-) Tan w/ Green Stripe
VW Amp Turn On Wire - Connect To New Radios Blue Power Antenna Wire
+12 Volt Ignition Wire Yellow w/ Red Stripe
Power Antenna Turn On Wire - Connect To New Radios Blue Power Antenna Wire
Dash Light Dimmer Wire Gray w/ Blue Stripe check for availability
+12 Volt Battery Wire Thick Red w/ White Stripe
Ground Wire Thick Tan Wire

Harness Color Codes 2
(typical of models prior to late 90’s)
NOTE:
Before beginning, compare the
color of the wires in your vehicle against
those of both list.

Right Rear Speaker (+) Blue w/ Green Stripe
Right Rear Speaker (-) Brown w/ Red Stripe
Right Front Speaker (+) Red w/ White Stripe
Right Front Speaker (-) Brown w/ White Stripe
Left Front Speaker (+) Black
Left Front Speaker (-) Brown w/ Blue Stripe
Left Rear Speaker (+) Blue w/ Green Stripe
Left Rear Speaker (-) Brown w/ Red Stripe
+12 Volt Ignition Wire Brown w/ Red Stripe
Dash Light Dimmer Wire Gray w/ Blue Stripe check for availability
+12 Volt Battery Wire Thick Red w/ White Stripe
Ground Wire Thick Brown Wire

'85 Silver Sunroof
'91 GTi 2.0 8v
'76 BMW 2002

>From: "Bruce Nadig" <motorbruce@hotmail.com>
>To: jtharvey2@hotmail.com, vanagon@GERRY.VANAGON.COM
>Subject: RE: VW Radio Into Vanagon (Long)
>Date: Sun, 25 Jan 2004 20:05:49 -0600
>
>
>John,
>
>The face plate is a dead ringer. Perfect. The case is slightly different,
>but I think it is basically the same unit.
>
>There is a great VW salvage yard here in town. I can probably get the right
>harness. Can you give me clues as to what the various wires will need to be
>connected? Any and all help is greatly appreciated!
>
>Cheers,
>Bruce
>
>
>
>>From: "J. Harvey" <jtharvey2@hotmail.com>
>>To: motorbruce@HOTMAIL.COM, vanagon@GERRY.VANAGON.COM
>>Subject: RE: VW Radio Into Vanagon (Long)
>>Date: Sun, 25 Jan 2004 17:22:14 -0800
>>
>>Does it look like this?
>>http://oxrocket.com/ebay/images/radio.jpg
>>
>>As far I can tell, these units came in  Passats, Jettas, and Golfs in the
>>mid/late 1990s.  It might be a good idea to go to the junkyard and pick up
>>the correct harness for $3 and splice it inot your van.
>>
>>HTH -John
>>
>>
>>'85 Silver Sunroof
>>'91 GTi 2.0 8v
>>'76 BMW 2002
>>
>>
>>
>>
>>>From: Bruce Nadig <motorbruce@HOTMAIL.COM>
>>>Reply-To: Bruce Nadig <motorbruce@HOTMAIL.COM>
>>>To: vanagon@GERRY.VANAGON.COM
>>>Subject: VW Radio Into Vanagon (Long)
>>>Date: Sun, 25 Jan 2004 18:34:36 -0600
>>>
>>>Howdy From Texas,
>>>
>>>Long story, but thanks to VW the stock radio on my '87 GL is now just a
>>>large paperweight. That is not the problems I am trying to solve today,
>>>although I am still pissed at VW (they can't get me the code for my radio
>>>because they didn't stamp the 14 character code into the chassis). Don't
>>>reply with suggestions on how to get it going again. I have moved on from
>>>that problem.
>>>
>>>For a replacement I want to keep the VW look. A good friend of mine is
>>>the
>>>local VW guru and used parts vendor. He has a VW head unit that I want to
>>>use in my Vanagon, but so far I haven't been able to get it to work. He
>>>swears that all he had to do to get to work in a car was plug it in - on
>>>codes, no nothing.
>>>
>>>This radio has a black face, VW logo, and says "Premium Audio." No other
>>>model names are present. This is a AM/FM/Cassette unit with CD changer
>>>controls. My friend told me that these are rare units. On the body of the
>>>radio there are a number of stickers. Several of them say "Premium." The
>>>part number appears in two places and is: 357 035 186H. One sticker that
>>>says Premium and has the part number also says "Made In Japan." Elsewhere
>>>on
>>>the radio there is a sticker that says "Assembled by Matsushita
>>>Communications Deutschland GMBH, Germany." Go figure. I don't know what
>>>year
>>>or model car this unit came from.
>>>
>>>On the front of the head unit it also  has a picture of a red key and
>>>says,
>>>"Anti Theft." My friend swears that he was able to plug it in to a car
>>>and
>>>it worked. He swears that he didn't need a code for the unit to work.
>>>
>>>I checked the fuse on the radio and it is good. I checked to see that the
>>>radio is getting power, and it is.
>>>
>>>On the back there are three receptacles for plugs on the factory harness,
>>>just as the original radio had. The lowest of the three is for power, the
>>>middle is for the connections to the speakers. The upper receptacle is
>>>for
>>>the cable that runs to the CD changer.
>>>
>>>I think the solution to this problem will be getting the proper wires
>>>hooked
>>>up to the proper pins on the bottom receptacle. The stock socket for the
>>>bottom receptacle has wires going to only 3 of the 8 pins. There is a
>>>label
>>>on the top of the radio with a key to the layout of the pins. The stock
>>>socket supplies power to one pin. Another pin is ground. A third is
>>>hooked
>>>up to the dimmer circuit of the dashboard lights. All other pins are left
>>>empty. On the label on top there are, however, symbols assigned to 3
>>>other
>>>pins. One looks like a "Y" but the vertical section is the full height of
>>>the character. I think this is a signal for a power antenna. One of the
>>>remaining pins with an associated symbol simply has a "+". The final pin
>>>has
>>>a picture of a speaker and a "+." Remember, only 3 of these pins are
>>>actually connected to anything on the factory harness (that is to say
>>>that
>>>the factory harness only has wires going to positions for 3 pins).
>>>
>>>The new radio also has 8 pins in the bottom receptacle. The power,
>>>ground,
>>>and dimmer pins are in the same positions. Like the old radio, the new
>>>unit
>>>also has the "Y" (antenna?) symbol, and the speaker with the "+."  There
>>>are
>>>two additional symbols. Rather than having the second "+" that the first
>>>radio had, the newer radio has an "S." Finally, there is a pin labeled
>>>"ALM." That is obviously for some sort of alarm function. One pin remains
>>>unlabeled on the newer radio.
>>>
>>>When I told my friend that the newer radio wouldn't work in my van he
>>>gave
>>>me one suggestion. He seemed to think that this would solve the problem
>>>right away. He really knows his VW stuff, especially electrical, so I
>>>didn't
>>>question him. I just followed his advice. He instructed me to connect the
>>>negative terminal and the terminal marked with the "S." He gave me the
>>>jumper wires with the correct ends to insert into the factory connectors
>>>and
>>>everything.
>>>
>>>Well, to make a long story, this afternoon, I did as he suggested. The
>>>new
>>>radio still doesn't do anything. I plug it in, turn it on,
>>>and....nothing.
>>>Nothing on the LCD screen. No mild thump from the speakers when the unit
>>>is
>>>turned on. Nothing. Any ideas?
>>>
>>>I'd really like to use this head unit for several reasons (factory look,
>>>cassette and CD capability, and the price is right).
>>>
>>>Any VW radio geniuses out there think you can help me with this problem?
>>>If
>>>we can get this solved you will have my eternal gratitude!
>>>
>>>Cheers,
>>>Bruce
>>>
>>>_________________________________________________________________
>>>Scope out the new MSN Plus Internet Software � optimizes dial-up to the
>>>max!
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>>
>

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