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dart330
Samba Member
Joined: July 19, 2004
Posts: 454
Location: Houston, TX
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 Posted: Tue Oct 28, 2014 4:17 pm Post subject: Unused Diagnosis Plug Wires |
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I've had this blank plug hanging down every since I picked up my 90 Carat. I was hoping it was pre-wired to the fusebox for the fog light switch. After searching I believe this is for the never installed OBDI check engine light or something to that effect. Part number 171941599. Brown, black, & grey w/ white stripe wires.
Can anyone tell me where these wires end up on the other end?
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crazyvwvanman
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Joined: January 28, 2008
Posts: 9923
Location: Orbiting San Diego
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| Posted: Tue Oct 28, 2014 7:08 pm Post subject: |
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The black wire is power from the key switch, unfused.
The brown wire is ground, from behind the dash.
The grey/white goes to the engine compartment wiring box. You should find it there if you look.
Mark |
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dart330
Samba Member
Joined: July 19, 2004
Posts: 454
Location: Houston, TX
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| Posted: Tue Oct 28, 2014 7:22 pm Post subject: |
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| Thanks! That will come in very handy. I can use the ground and wire running to the rear for sure. Any suggestions for the unfused power wire? |
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WLD*WSTY
Samba Member
Joined: November 04, 2009
Posts: 438
Location: Arizona
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| Posted: Tue Oct 28, 2014 9:04 pm Post subject: |
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Rear window defroster switch plug. Grey/white goes to the heating grid.
_________________
'82 SyncroWesty, the first ever conversion.'06 Subaru 2.5L |
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dart330
Samba Member
Joined: July 19, 2004
Posts: 454
Location: Houston, TX
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| Posted: Wed Oct 29, 2014 7:48 am Post subject: |
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| WLD*WSTY wrote: |
| Rear window defroster switch plug. Grey/white goes to the heating grid. |
My defroster switch is already plugged in and works. |
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crazyvwvanman
Samba Member
Joined: January 28, 2008
Posts: 9923
Location: Orbiting San Diego
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| Posted: Wed Oct 29, 2014 8:02 am Post subject: |
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Not to mention the defroster switch plug has more wires and they are different colors.
Mark
| dart330 wrote: |
| WLD*WSTY wrote: |
| Rear window defroster switch plug. Grey/white goes to the heating grid. |
My defroster switch is already plugged in and works. |
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ZsZ
Samba Member
Joined: December 11, 2010
Posts: 1645
Location: Budapest Hungary, Europe
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| Posted: Wed Oct 29, 2014 9:39 am Post subject: |
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Not familiar with the US wiring, but the grey/white wire is for the rear fog light on the euro models
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Zoltan
1.9 MTdi 2wd Multivan (ex Caravelle)
Van since 2006, engine since 2008 |
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geo_tonz
Samba Member
Joined: August 01, 2012
Posts: 1472
Location: Courtenay, BC, CANADA
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| Posted: Wed Oct 29, 2014 9:46 am Post subject: Re: Unused Diagnosis Plug Wires |
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| dart330 wrote: |
| I've had this blank plug hanging down every since I picked up my 90 Carat. |
Where was this plug hanging down (what area of the dash)? I'd like to find it and use the switched wire for a stereo toggle and an Amp trigger (with an in-line fuse). Maybe I'll just plug into it with a spade and leave it intact. I could use the ground for the amp too I suppose.
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 "Ron Burgundy": 1991 Vanagon Multivan (Weekender) 2.1L Auto - Driver/Camper |
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crazyvwvanman
Samba Member
Joined: January 28, 2008
Posts: 9923
Location: Orbiting San Diego
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| Posted: Wed Oct 29, 2014 9:49 am Post subject: |
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Here we didn't use it for that. When California was going to mandate an emissions system fault indicator on the dash VW starting getting ready for it. They added a simple OBD capability to the later ECU (022D) and added some wiring for that feature. AFAIK the feature was never completed though 1988 owners manuals do show it on the dash instrument cluster, in the lower right switch hole. The texts explains that it is to display stored codes and to see your VW for an explanation of the codes and repairs.
Mark
| ZsZ wrote: |
| Not familiar with the US wiring, but the grey/white wire is for the rear fog light on the euro models |
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ZsZ
Samba Member
Joined: December 11, 2010
Posts: 1645
Location: Budapest Hungary, Europe
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| Posted: Wed Oct 29, 2014 10:56 am Post subject: |
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| crazyvwvanman wrote: |
Here we didn't use it for that. When California was going to mandate an emissions system fault indicator on the dash VW starting getting ready for it. They added a simple OBD capability to the later ECU (022D) and added some wiring for that feature. AFAIK the feature was never completed though 1988 owners manuals do show it on the dash instrument cluster, in the lower right switch hole. The texts explains that it is to display stored codes and to see your VW for an explanation of the codes and repairs.
Mark
| ZsZ wrote: |
| Not familiar with the US wiring, but the grey/white wire is for the rear fog light on the euro models |
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Oh, clear now!
Then VW used the same wiring harness for different purposes. 
_________________
Zoltan
1.9 MTdi 2wd Multivan (ex Caravelle)
Van since 2006, engine since 2008 |
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geo_tonz
Samba Member
Joined: August 01, 2012
Posts: 1472
Location: Courtenay, BC, CANADA
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| Posted: Wed Oct 29, 2014 11:09 am Post subject: |
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So from that picture it should be in the cluster area near the tach somewhere?
_________________
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"Ron Burgundy": 1991 Vanagon Multivan (Weekender) 2.1L Auto - Driver/Camper |
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crazyvwvanman
Samba Member
Joined: January 28, 2008
Posts: 9923
Location: Orbiting San Diego
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| Posted: Wed Oct 29, 2014 11:17 am Post subject: |
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If a van has it at all it should be below the cluster in the wiring mess.
Mark
| geo_tonz wrote: |
So from that picture it should be in the cluster area near the tach somewhere? |
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dart330
Samba Member
Joined: July 19, 2004
Posts: 454
Location: Houston, TX
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| Posted: Wed Oct 29, 2014 12:05 pm Post subject: |
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| crazyvwvanman wrote: |
Here we didn't use it for that. When California was going to mandate an emissions system fault indicator on the dash VW starting getting ready for it. They added a simple OBD capability to the later ECU (022D) and added some wiring for that feature. AFAIK the feature was never completed though 1988 owners manuals do show it on the dash instrument cluster, in the lower right switch hole. The texts explains that it is to display stored codes and to see your VW for an explanation of the codes and repairs.
Mark
| ZsZ wrote: |
| Not familiar with the US wiring, but the grey/white wire is for the rear fog light on the euro models |
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So that explains why the plug looks like it hooks into a switch. I thought it would just be a light in the center of the console, not an entire lighted switch. Seems like a really odd way to do it.
I plan to use the grey wire for a rear fog light, but still not sure what to do with the black wire since I have the stock radio. |
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geo_tonz
Samba Member
Joined: August 01, 2012
Posts: 1472
Location: Courtenay, BC, CANADA
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| Posted: Wed Oct 29, 2014 12:09 pm Post subject: |
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| dart330 wrote: |
| crazyvwvanman wrote: |
Here we didn't use it for that. When California was going to mandate an emissions system fault indicator on the dash VW starting getting ready for it. They added a simple OBD capability to the later ECU (022D) and added some wiring for that feature. AFAIK the feature was never completed though 1988 owners manuals do show it on the dash instrument cluster, in the lower right switch hole. The texts explains that it is to display stored codes and to see your VW for an explanation of the codes and repairs.
Mark
| ZsZ wrote: |
| Not familiar with the US wiring, but the grey/white wire is for the rear fog light on the euro models |
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So that explains why the plug looks like it hooks into a switch. I thought it would just be a light in the center of the console, not an entire lighted switch. Seems like a really odd way to do it.
I plan to use the grey wire for a rear fog light, but still not sure what to do with the black wire since I have the stock radio. |
Wouldn't you use the black wire as your fog light power, run it through a switch and then to the back on the grey wire? Then the fog light would only work with the key on and can't be accidentally left on?
_________________
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"Ron Burgundy": 1991 Vanagon Multivan (Weekender) 2.1L Auto - Driver/Camper |
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dart330
Samba Member
Joined: July 19, 2004
Posts: 454
Location: Houston, TX
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| Posted: Wed Oct 29, 2014 12:53 pm Post subject: |
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Wouldn't you use the black wire as your fog light power, run it through a switch and then to the back on the grey wire? Then the fog light would only work with the key on and can't be accidentally left on? |
I was going to try and follow this wiring diagram, but not 100% sure. Brown wire is easy, but where on the fuse box do you plug in for the rear fogs? I would also want to put a relay on all of them.
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WLD*WSTY
Samba Member
Joined: November 04, 2009
Posts: 438
Location: Arizona
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| Posted: Thu Oct 30, 2014 12:11 am Post subject: |
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| crazyvwvanman wrote: |
| Not to mention the defroster switch plug has more wires and they are different colors. |
Quite right. I just love playing the fool around you, Mark! 
_________________
'82 SyncroWesty, the first ever conversion.'06 Subaru 2.5L |
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