Unclear fuse assignment for VW [Touran 1T, 04.2009]

Hello everyone,

I have a question about the VW wiring diagrams that I downloaded for a fee to help me troubleshoot a problem.

During a leakage current test, I removed all the fuses. It seems I accidentally reinserted fuse F7 in the fuse box in the engine compartment into the wrong position, leaving the "F7" slot empty and preventing the car from starting.

My vehicle (production date according to the VIN: 04/02/2009) did not have a fuse installed at position F7 according to the wiring diagram. Because I was experiencing significant electrical problems (e.g., terminal 15 was not receiving power), I experimentally installed fuses in various free slots. Suddenly, voltage reappeared at terminal 15, and the engine started up without any problems.

Upon reviewing the wiring diagrams again, I noticed that a fuse for terminal 15 was actually only specified "from" May 2009 (I have a vehicle manufactured on April 2, 2009).

Now, I would like to carefully re-check all the fuses, based on the wiring diagram that is valid from May 2009 onwards, specifically focusing on:

* correct labeling,
* correct position,
* appropriate amperage rating.

I noticed several inconsistencies: incorrectly labeled, missing, or incorrectly rated circuit breakers.

My question:
Can someone tell me definitively which fuse configuration applies to my vehicle (manufactured on April 2, 2009)?
I absolutely want to avoid causing any further problems or damage by using incorrectly sized or overly protective fuses.

Thank you in advance!

Tip: Replace the fuses with new ones, as hairline cracks are not always easy to spot.

The fuses are working properly.
The problem is that neither of the available fuse occupancy plans seems to be correct for my model (production date 02.04.2009). Here, the fuses are incorrectly listed as "not occupied," which is not accurate.

Generally, you can only determine the model year based on the VIN (Vehicle Identification Number) by looking at the 10th digit. What you're referring to is the information on the vehicle data carrier. On older models, you can find the production week and day of the week there, while on newer models, you only find the year and month.
Regarding the wiring diagram, the changes in the documentation do not necessarily have to be completely synchronized with the actual construction. When my old Audi 80 broke down, I was able to get a replacement turbocharger hose from the parts supplier using the VIN.
The wiring diagram I have covers all model years and variants. I extracted the 500 relevant pages from the 1700 pages for my model.
You probably can't tell anymore what was poorly documented and what you yourself changed.
The only thing you can do is compare the fuse assignments in the document with the actual wiring diagram and the description embossed on the cover. The latter would be the most important factor.
hg
Herbert.

Unfortunately, there are no longer any markings on the Touran's covers, and even the owner's manual only contains a minimal amount of information about the relevant fuses.
Surely, it should be possible to determine the exact and reliable fuse configuration based on the vehicle data?

Unfortunately, that's not the case. While wiring diagrams can be used as a starting point, you can never rely on them completely.

Generally, the wiring diagrams should be consistent and accurate as provided by the manufacturer, otherwise no (contractual) workshop would be able to work on the vehicle.
What likely happened here is that the transition in the documentation and in the production process was not fully synchronized (assuming the production month identified by the user is correct).
You must choose the option that best fits the construction period.
- Basic equipment,
- Engine, possibly. Transmission.
- Optional equipment,
Please also refer to the footnotes for information on fuses and installation locations.
That gives the overall picture.

In this case, I would first address all error entries related to the electrical connection. Then, I would compare the existing fuse configuration with the information in the wiring diagram, specifically the fuse locations and the diagram itself. This can be done using the search function in Acrobat. Hopefully, this will resolve (most of) the issue.
Where does the information about the production month/day come from? Was was added to the vehicle after it was manufactured, was there a previous owner?
hg
Herbert.

To address Herbert's questions again:
I retrieved the production date via the VIN using PartLink24, and it is April 2, 2009. The plastic parts, including the fuse box, are stamped with "03/2009." The car was first registered on April 29, 2009. The car had two previous owners: first, the car dealership as a one-year-old vehicle, and then a corporate customer. According to the service booklet, it was only serviced at VW dealerships. The only addition is a Bluetooth interface at the CD changer output, which has been working perfectly for years.

In this thread, I'm not so much concerned with the (already identified) cause of the error anymore, but rather with how I can now definitively determine the correct circuit breaker assignment. I don't want to cause any further damage by using a circuit breaker that is incorrectly sized. Is the production date, the model year, the first registration date, the date of the EC type approval, or ultimately the PR codes the determining factor?

The background is that neither the "until 04/2009" plan nor the "from 05/2009" plan really fits. For example, according to the plan, room F7 should either remain free or only be occupied starting in May. In my car, the engine only started after I tried inserting a fuse into a socket that was supposedly "free."

Therefore, my actual question is: According to what criteria does VW determine which security plan is binding, especially for a vehicle that was produced precisely during a transition period?

PS: I also tried to download a vehicle-specific dataset from Erwin (siehe Fehlerdatenbank) again, but unfortunately, that's no longer possible for private individuals. Of course, only after I've paid. )-:

If slot F7 must be occupied, and this occupation only appears in the wiring diagram from May 2009, then this is likely the correct one.
What else is wrong, and how did you actually correctly assign the fuses during installation? The chaos probably started there.
hg
Herbert.

I think exactly like Herbert. Since your vehicle only works with F7, I would consider the "starting in May" wiring diagram to be the correct one.

Is there anything that only works with the "until April" setting? Or is your doubt solely based on the production date?

If there are different occupancy rates, you can simply check them.

Purely arbitrary example:
In the "until April" fuse plan, fuse 1 is set to 30A for the ABS system. In the "from May" fuse plan, fuse 1 is set to 5A for the windshield wipers. Then, you simply remove that fuse and see if the windshield wipers work or if the ABS light remains on. That's it. Then you'll know whether a 30A or a 5A fuse is needed.

After I was able to identify the problem with the missing fuse "F7" by temporarily inserting it (see original post), I, too, came to the conclusion that only the fuse layout "from 5/2009" can be valid.
Following that, I meticulously checked all the fuses according to this plan and replaced them. Result: The car still wouldn't start, and in addition, the windshield wiper fluid pump was no longer working.
Also, what was also striking was:

- some small fuses have different ampere ratings.
- In the main distribution panel, slots F27, F28, F29, and F30 contained two 50A fuses, whereas the plan specifies a 30A fuse (F29) and a 50A fuse (F30).
- According to the plan, rooms F27 and F28 are supposedly not booked.

By rearranging the maxi fuses and inserting a third fuse, I eventually managed to get the car running again, and the windshield washer pump also works.
Despite this, doubts remain: The occupancy schedule doesn't quite align perfectly if you strictly adhere to the dates (since the car didn't start initially), and overall, the discrepancies seem a bit odd.
Therefore, I would now like to definitively ensure, as a final step, that the fuse configuration is correct. It's reassuring to know that even the experts in this forum have come to the conclusion that only the "from May 2009" plan seems likely to be correct.
When I'm back home, I definitely want to follow up with VW to get the correct fuse layout – unless someone here in the forum can directly help me with information from official documents.
I also plan to unscrew the fuse box to check from the bottom which slots are actually empty. Unfortunately, it's not possible to clearly identify it from above, unlike with the internal fuse box.

Due to the complexity of the situation, I can't remember every single detail perfectly (e.g., exactly which fuse was faulty), but I believe and hope that I've generally captured the main points correctly...

Hi,
I can only view the table of contents of the wiring diagram without paying. This shows 6 different versions of the basic equipment, along with fuse assignments, but no "valid from" dates. Surprisingly, the BLS engine you mentioned isn't actually in the car.
Could you please let me know which chapters you use for the basic equipment and for the engine?
hg
Herbert.

Right now, I only have access to the PDF document on my iPad while I'm on the go, and the keyword search function works only to a limited extent. I found the engine code "BLS" mentioned on the following 3 pages or chapters:

- No. 89 / 1 (PDF, page 985), starting May 2005.
- No. 139 / 1 (PDF page 1418), starting in October 2006.
- No. 184 / 1 (PDF, page 1786), effective May 2008.

If I check the aforementioned plan No. 184 / 1 (PDF PAGE 1786), specifically at No. 184 / 3 in the circuit diagram, starting in May 2008, I find on the right side the following information: "SB7, fuse 7, on fuse holder B. And in the circuit diagram, it also states "SB7 (40A)". In the tabular view for fuse allocation, section 1.6.5 (SB) in the E-Box Low, starting in May 2008 (beginning on PDF page 2592), it states: "not allocated."
The tabular occupancy schedule, starting from May 2009, can be found under section 1.6.6. Circuit breaker assignment (SB) in the E-Box Low (starts on PDF PAGE 2595).

Hi,
The free preview table of contents does not include page numbers and may not be entirely complete.
I suspect that the basic equipment section 168 applies to your vehicle, including the subsections regarding fuses and installation locations. Actually, it is subordinate to Section 184 (in the preview I have available, it only applies to the BMM, and the BLS is not mentioned), but also includes all of its subsections.
The installation locations in sections 80x need to be aligned. What does section 8 / 1.6.6 say?
hg
Herbert.

I have compiled the fuse assignments (SB) for the E-Box Low, starting in May 2008 (Section 1.6.5) and 2009 (Section 1.6.6), into a table (see attachment).
I hope I haven't made any translation errors.
I noticed that in line 20, there's a terminal designation at the end, even though the fuse is supposedly not connected. I just checked the original schematic again, and it seems there's actually a small error there. While this is technically insignificant, it certainly suggests that something may have been done carelessly here.

If you just want to know whether a slot is occupied or not: simply take a look inside the fuse holder. At least for the ones located inside the car, you can see two silver contacts if the slot is occupied. If it is not populated, only a pin connected to the power supply is visible, but not a pin for the load.

If, on the other hand, the question is about what level of protection is needed, then you have to check what is connected to it.