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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old December 3rd, 2012, 04:53   #181
TonyJetta
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So...was it that 2nd relay?

Tony
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Old December 5th, 2012, 14:32   #182
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Quote:
Originally Posted by drozia View Post
So where is that selonoid valve located at? What is the item number do you know?
THe solenoid for the fresh air / recirculate change is on the left inner fender / mud guard of the B4 Passat. I don't know where it might be on the Cordoba. Locate the fresh air intake at the base of the windscreen under the hood / bonnet. Look for a small (4 or 5 mm?) air hose that goes to that area. Follow that hose to its other end.
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Old December 21st, 2012, 09:27   #183
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Originally Posted by Lug_Nut View Post
Where exactly does the heavy gauge positive feed for this GP fuse come from? Where in the CE2 fuse box? TDI swapped mk2 and I totally just realized there was a heavy gauge red wire coming out of this fuse holder and I never hooked it up. This would explain my nightmare cold starts. I believe it's like a 4 or 6 gauge wire with a yellow(?) connector?!
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Old December 21st, 2012, 10:08   #184
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Z1. I pm'd you back already.
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Old April 30th, 2013, 10:53   #185
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Anyone know the P/N for the jumper relay used with the FA wiring?
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Old April 30th, 2013, 16:45   #186
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Originally Posted by Big Daddy Roth View Post
Anyone know the P/N for the jumper relay used with the FA wiring?
It's in this thread somewhere, but it's an obsolete part. You can make one or repair the one you have.
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Originally Posted by Mcgink View Post
It's fixed, I took the part from relay position #12 from my B4 sedan and compared it to the 103 relay which was in my B4V.
This is what they look like opened up:

I'm thinking that at some point that the PO had a cold start issue and a Tech replaced the wrong part. The part on the right is callled a "Bridge" and the part # is: 3A0 941 817. FYI the part is obsolete according to the local VW dealer's parts dept.
Without the info/pics in the begining of this thread, I would no doubt be still scratching my head trying to diagnose the root cause of my cold start issue.
Thank you

Last edited by Mcgink; April 30th, 2013 at 16:54.
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Old October 27th, 2013, 20:56   #187
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Originally Posted by Lug_Nut View Post
The question of which fuse or relay is the one for the glow plugs won't go away. Perhaps this one thread will eliminate the 40 or 50 each year that ask the same question over and over.
The fuse for the four cylinder glow plugs is located inside the cabin above the fuse and relay mounting block. Please see the images below for the locations on the B4 Passat (near the top of the inside firewall), and on the A3 Jetta (at the top of the fuse and relay block).

1996 B4
On the North American market 1996 Passat the glow plug relay is the one in position #12 of the fuse and relay block just above the driver's feet. The relay is identified by a "103" printed on its top. Note: The Bentley manual electrical schematic has a typo which indicates this glow plug relay is marked with "104". The image below shows a typical 1996 B4 relay layout. The glow plug fuse location is similar to that shown in the 1997 B4 image to follow.
This wiring harness requires the BK or GQ ECU.



1997 B4
On the North American market 1997 Passat the glow plug relay is moved to a remote location above the main fuse and relay block. There were several other wiring changes made at this transition. The glow plugs relays are not interchangeable between the early and the late wiring harness changes. The glow plug relay is now marked "180". A 'jumper relay' is installed in position #12 to allow electrical power to feed to the remote 180 glow plug relay location. The other relays in the relay and fuse block are positioned similar to those shown in the previous 1996 image. The image below shows the mounting location of the "180" glow plug relay in the 1997 and also the glow plug fuse location in both the 1996 and 1997 B4. Thanks to TonyJetta for the edit of PaulB's picture showing the 1997 relay and fuse location.
This wiring harness requires the FA ECU.







Important Note: The wiring harness change in the B4 TDI took place part way through the 1997 model year. According to the Bentley manual the change over took place at the end of October 1996 for the last of the early, BK/GQ/103 wiring harness, with a November 1996 start for the later, FA/180 wiring harness. Very early 1997 models, those built in June through October of 1996, might therefore have a harness similar to the 1996 models and would require the "103" relay.
The glow plug relays are not interchangeable between harnesses. The relays and/or the wiring harnesses can be damaged, and wiring harness fire inside the cabin is a real possibility, due to the dead shorts created by improper glow plug relay use.





1998 A3
The North American market 1998 A3 has the "180" glow plug relay attached above the main relay block. The glow plug fuse is mounted just above the glow plug relay, not separately on the inner firewall as on the B4. Also note in the image below that there is nothing in the lower right relay socket (location #12). This is a difference from the 97 B4 TDI which needs a jumper to feed power to the glow relay 180.
Note: The installation of a #12 jumper relay from a 1997 B4, or the installation of a "103" or "180" glow plug relay in this vacant position with the 1998 A3 wiring harness can also cause damage to electrical components and possibly fire from dead shorts.


Note: The Bentley wiring schematics show a change in the wiring of the glow plug relay during the A3 TDI production years. I have no further knowledge of the differences than what is described below in post #7.
Thank you
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Old October 31st, 2013, 00:50   #188
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Originally Posted by Lug_Nut View Post
98~99 A3
In the 98 A3 the socket #12 is empty. The glow plug fuse is before the glow plug relay. The fuse is always hot. Again there is no easily accessed test point for either.
Note that the Bentley A3 service manual's electric schematic, sheet 97-415, indicates the glow plug wires from the glow relay are 0.5 mm in cross section. The correct size is 5.0 mm cross section.

So I check the fuse above the relay and it was burnt out. Where can I find a replacement fuse? its a 32 volt 50 amp fuse. The relay is marked with 53 not 180. Is this an issue?

I pulled the blown fuse from the spot right above the relay marked 53.


EDIT* This is the layout of my relays under the dash

Last edited by Stoneage; October 31st, 2013 at 01:19.
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Old October 31st, 2013, 15:57   #189
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The relay marked with the production code 53 is an ordinary, run-of-the-mill relay such as would be used for the horn or fog lamps or any of a number of functions, but not for the glow plugs.
All those fuse and relay modules above the main array can be moved around, taking their wires with them so the arrangement map varies whether it was Johann or Juan building that car.
I don't have a Bosch cross reference but the fat red wire going away is another clue that the 53 relay isn't involved with that fuse holder.
Most auto part stores will have the high current blade fuses. I know the AutoZone near my house does.
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If the quantity of carbonic acid increases in geometric progression,
the augmentation of the temperature will increase nearly in arithmetic progression.

Svante Arrhenius 1896

Cogito ergo soy (I think, therefore: Biodiesel)
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Old October 31st, 2013, 16:39   #190
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Quote:
Originally Posted by Lug_Nut View Post
The relay marked with the production code 53 is an ordinary, run-of-the-mill relay such as would be used for the horn or fog lamps or any of a number of functions, but not for the glow plugs.
All those fuse and relay modules above the main array can be moved around, taking their wires with them so the arrangement map varies whether it was Johann or Juan building that car.
I don't have a Bosch cross reference but the fat red wire going away is another clue that the 53 relay isn't involved with that fuse holder.
Most auto part stores will have the high current blade fuses. I know the AutoZone near my house does.
Ok thanks I'll go check them out. Do you know which one would be my glow plug relay?
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Old November 1st, 2013, 05:06   #191
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Could someone post a link to where I could buy this fuse above online??
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Old November 1st, 2013, 05:20   #192
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I ended up figuring it out the one to the left of the 53 relay after some googling came up with this one being the glow plug relay. If anyone runs into this in the future not being marked 180. This one is your glow plug relay.



The one with the arrow pointing at it.
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Old January 25th, 2014, 08:18   #193
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Quote:
Originally Posted by TonyJetta View Post
So...was it that 2nd relay?

Tony
Sorry for the delay in response, but yes. Pulled the errant relay & all issues went away, magically.
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Old February 3rd, 2014, 09:32   #194
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I know i'm jumping in, but quick question. Is there a fuse for the main glow plugs on a 98 Jetta? If so is it behind the fuse box or located somewhere else on the car. I know there is a strip fuse in the engine bay under the rain drip tray. What does this fuse go to?
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Old February 3rd, 2014, 16:41   #195
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Fat red wire screwed to a socket headed cap screw at one end of the strip fuse? Black wires from underneath and a plug conncetion underneath as well?
That's the fuse for three coolant heaters to help warm up the car a bit quicker.
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If the quantity of carbonic acid increases in geometric progression,
the augmentation of the temperature will increase nearly in arithmetic progression.

Svante Arrhenius 1896

Cogito ergo soy (I think, therefore: Biodiesel)
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