Looking for S2/RS2 Thermo Fuse info

[UrS4boy]

Paul: I never really doubted your work on documenting the ABY/ADU loom(s). In some ways I thought it funny that the factory couldn't put the fuse holders in the correct positions, e.g. 23 and 24 instead of 24 and 25. Must have been a Friday.

The original reason behind the post was to alert S2forum members to the possibility that some of their engine running problems *MIGHT* be due to a failing thermo fuse for the coils (this is happening more and more over on my side of the pond to UrS4 owners and their S64 thermo fuse). It seems that the factory switched to regular spade fuses for the UrS6s and never even installed thermo fuses in the ABY or ADU vehicles. This does not mean that cracked coil wiring won't short out on the cam cover and blow that S32 spade fuse. At least it will be an acute failure and not an intermittent failure like a faulty S64 thermo fuse.

Thanks for the comments.

[S2central.net]

@Dave et al,

The fuse info I compiled is aligned with factory ABY & ADU schematics. To my knowledge, that detailed breakdown of the loom I collated is correct. What I have sometimes found is that some cars fuseboxes do occasionally have some of the 23-32 fuses shifted around... reason being it is easy to make a mistake and plug the carrier into any open slot.

You also see it with the auxiliary relay panels where the factor sometimes uses random locations to equip the relay carriers - not as per documentation - very UNgerman and rather annoying.

The really odd thing is I have loads of ABY with main fusebox relay #2 fitted - but of course it aint used for anything on ABY - it gets used on other B3/B4 models though.

Finally - I have only ever seen the thermofuses on AAN looms - NEVER on 3B, ABY or ADU engine looms - you see them for electric windows / sunroof on the B3/B4 of course.

[johne]

I have central locking (but not remote central locking) - which works fine - but not the heated door locks.

Looking at Paul's diagrams, central locking without remote uses fuse 19, central locking with remote doesn't use fuse 19 but has an inline fuse S111 doing the same job.

In reality I guess earlier central locking systems used fused 19, later ones which may also have the remote didn't use fuse 19.

John

[UrS4boy]

To be honest, at the time I made my first post I was 4,000 miles away from my car but now I'm a bit closer so here's a picture of my '96 ABY fusebox. (Not sure why fuse 19 is empty ) John

Thanks for the photo of your fuse box. Do you have central locking and/or heated door locks (see lowest part of the left side list)?:

[johne]

92 views and only one person checks their fuse box.

Thanks Johne.

To be honest, at the time I made my first post I was 4,000 miles away from my car but now I'm a bit closer so here's a picture of my '96 ABY fusebox. (Not sure why fuse 19 is empty )

John

[ifa]

Yes power windows.

[UrS4boy]

the thermo fuses are under the removable cover which is under the steering wheel on an aby s2 coupe

Any idea what that thermo fuse controls (it isn't anything ECU or ignition related). Power windows?

[vonbeck]

the thermo fuses are under the removable cover which is under the steering wheel on an aby s2 coupe

[UrS4boy]

Pic from -94 my.

Thank you. So yours has No. 23 and 26 empty as per Paul N's diagram. I see you also have the orange "Motor/Moteur" cover over the 27 and 28 spade fuses.

I guess the result of this is the RS2s did not get thermo fuses on any of the 4 fuses that deal with the ECU and ignition. I think the No. 23 open or not must be a quirk based on who stuffed the fuse holders in the back of the fuse box at the factory.

[ifa]

Pic from -94 my.

[UrS4boy]

So based on the lack of responses to my question, I have to assume that everyone has fuses in 23 and 24 but none in 25 and 26 (and therefore Paul N is wrong????) and that everyone has the orange "Motor/Moteur" over 27 and 28.
Thanks.

92 views and only one person checks their fuse box.

Thanks Johne.

[UrS4boy]

So based on the lack of responses to my question, I have to assume that everyone has fuses in 23 and 24 but none in 25 and 26 (and therefore Paul N is wrong????) and that everyone has the orange "Motor/Moteur" over 27 and 28.

Thanks.

[UrS4boy]

Should have looked harder. Found Paul N's incredibly detailed 57 page ABY/ADU wiring pdf. On page 40/57, I found that the "missing" fuse that is the equivalent to the UrS4's S75 is the S24. I was surprized to find the constant power fuse, S27 (AAN S26) is 20A for the ABY/ADU whereas it is only 5A for the AANs S26. Without a photo of the fuse box (shown schematically on Paul's pg. 43/57), I can't tell but it looks like the ABY and ADU did not get thermo fuses (the ones that look like rectangular metal cans). Is that correct or did early ABYs (93) get them and later ones didn't?

Okay, I got some photos from our Canadian RS2 owners, notably the Noggy blue owner. Looks like no Thermo fuses. Does raise another couple of questions though.

According to Paul N's diagrams (pg.43/57), on the row with the No. 23 through 32 fuse holders, the No. 23, 26 and 30 holder positions are empty, with No. 24 = the ISV, WGFV and Evap Control fuse, No. 25 the O2 sensor fuse, No. 27 = ECU constant 12v, No. 28 = fuel injectors and MAF and No. 32 = coils (reference: Paul's wiring pdf, Pg. 40/57)

The Noggy blue RS2 fuse box has 23 and 24 filled but 25 and 26 empty. It also has an orange cap "Motor/Moteur" over the 27 and 28 (20A and 15A) fuses. Is that common or by now have most people lost that cap?

I doubt that it is a big deal that the "24" and "25" holders have been shifted to the left by one, but is that common?

See diagrams and photos:

[UrS4boy]

The only thermal fuses my '96 ABY has are the ones on the auxilary panal for the electric windows. I wouldn't want to use resettable fuses on safety critical items like the ECU unless they were aerospace quality ones. John

Thanks. I don't disagree. I wonder about the early (93) ABYs and the 94 ADUs.

[johne]

The only thermal fuses my '96 ABY has are the ones on the auxilary panal for the electric windows.

I wouldn't want to use resettable fuses on safety critical items like the ECU unless they were aerospace quality ones.

John