help with heater blower please

[whiteakita1]

hi, yesterday my blower motor stopped working on all 4 settings.
today i removed the motor and bench tested it, with 12v applied it spins up perfectly, the fan also spins easily by hand.
so i tested the electrical connector that plugs into the fan, onb fan switch position 0 there is 0 volts, on fan switch positions 1,2,3,4 there is 1.7v going to the connector, shouldnt there be 12v going to the connector ?
because there is some power 1.7v going to the connector does that rule out fuse/relay problems or highlight them ?
there doesnt seem to be enough power going to the connector to power the fan.
it worked perfectly yesterday morning.
can anyone help ?

[whiteakita1]

I have connected vcds which says there is no fault codes.
Tried doing a output test in the HVAC controller but nothing is happening.
But in measuring values it does show the heater to be turning on and off when I turn the heater knob from position 0 to position 1.

[UMEL]

With my very limited electronics would the switch not be switching relays where the higher voltage resides.

[whiteakita1]

do you know where the relays are ? and which one it would be ?

[UMEL]

I think they are under the bonnet, box next to battery but I don't know which it is.

[whiteakita1]

there is only one relay in there, the rest are fuses

[whiteakita1]

i have found some under the steering wheel but dont know what they are for

[UMEL]

Is this any good,

2010-2015 Volkswagen Passat (B7) Fuse Box Diagram » Fuse Diagram (http://knigaproavto.ru/shemy/en/volkswagen/passat/96-volkswagen-passat-b7-fuse-box-diagram-2010-2015.html)

Scroll down to Safety cutout under dash panel, driver side

Fresh air blower relay No 1 (J13)

[whiteakita1]

my windscreen washer motor has stopped working too, must be linked somehow

[whiteakita1]

does anyone know which relay is for the heater and washer pump on a 2011 passat b7 rhd 1.6tdi ?

[Flash2]

Before digging in looking for relays I'd suggest you check the fuses. Looking at the link above, fuses SC1 & SC38 power the blower and SC40 powers the washer pump.

The info in the link says fusebox 'C' is on the left of the dash. The info in the manuals usually relates to LHD models, so fusebox 'C' will be on the right hand side of the dash on your car and the fusebox will be a mirror image of the diagram.

BTW, a common problem with the Passat washer pump is the wiring under the OS headlamp breaks (usually a green/white wire if I remember right). I've repaired quite a few of them over the years.

[whiteakita1]

thank you for the reply, i should of said i did check every fuse i could find including the ones in the end of the dashboard. they are all fine.
the washers were working but stopped working at exactly the same time the heater fan stopped.

[Flash2]

How did you check the fuses? Did you remove them and visually inspect them or did you check them using a voltmeter?

You really should check fuses using a voltmeter or even a test light. Not only does that tell you whether the fuse is blown or not but it also tells you whether there is voltage being supplied to the fuse. Obviously, with no voltage being supplied to the fuse the circuit isn't going to work, regardless of whether the fuse is blown or not.

[whiteakita1]

does anyone know which relay it is for the heater fan and the washer pump ???

[Flash2]

I think the "X-contact relief" relay will be the one that's common to both those circuits. I'm sure it supplies power to the fuses which is why I suggested checking the voltage.

[whiteakita1]

yes i think you are correct, that is also what crasher says in a few other threads i have read, but does anyone know where it is on my 2011 b7 passat 1.6tdi ? i have messaged crasher directly and im waiting for him to reply.

[whiteakita1]

i did previously mention that i had checked the voltage and with the fan in all 4 positions i was only getting 1.7v

[whiteakita1]

i phoned vw up and asked them about the x contact relief relay and they said they had never heard of one ! im getting nowhere fast with this.

[Crasher]

Sorry for the delay, I have been upto my neck in work with people off on holiday. I have your VIN so I will try and do this tomorrow as my home access on an iPad does not allow me to use my work systems. There are X relays listed on the VW parts systems but the parts chaps are more used to SDC codes such as J645 which is one of the X relays.

[whiteakita1]

thanks very much crasher, there are some relays under the steering wheel area where there are 3 pairs of the same relay so i have swapped them all over with their matching pair but nothing has changed.
the only other relay i can find in the whole car is 1 in the fuse box next to the battery.
there must be more but i cant find them anywhere and cant find much information at all about relay locations on the b7 passat online, even lookers vw in darlington couldnt tell me where they were.

[Crasher]

Just noticed that this is a UK registered car **11 *TF, I thought you were in NZ.

According to the Pr code list you have KH6 Climatronic

The fan is powered from fuse SC38 on the dash right hand side when you open the door, behind the panel.

Also check fuse SC15 which is the control unit power.

Fuse SC38 is powered by two different methods depending on build date and this change is described as “gradual introduction” which is about as much help as a blower that does not blow! The change is only visible by checking the colour coding of the 6mm² csa cable to the SC fuse board line 30a rail to see if it is black or red/green and that is not easy to do.

On both versions the feed is from a junction point called B319 which is also helpful described as being “in main wiring harness”, no ****, I thought it would have been under the back bumper! Stupid diagrams!

The junction B319 also supplies the J59 relay also known as the X relay but J59 only powers fuse SC40 and not the fan so X circuits not working are a symptom of the X relay not being supplied (as opposed to triggered) and not the X relay itself being faulty. If fuse SC40 has no power from the X relay then the front and rear wipers won’t work

B319 is supplied from fuse SB29 in models with the E-Box low like yours so check this has power.

Check that lot, I need to get on now.

[whiteakita1]

i am really greatful for the reply crasher but honestly i have no idea what any of it means, electrics are way over my head.
can anyone on here decipher crashers brilliant description and tell me exactly which fuse i need to check ?
sc38 and sc15 seem to be the ones that need checking but can anyone tell me which ones these are ?

[whiteakita1]

i cant find any diagram anywhere for the fuse number locations for my b7 passat.

[whiteakita1]

Ok, I have replaced them 2 fuses, 1 is 10amp the other is 40 amp but fan is still not working.
When I turn the heat knob I can hear motors moving but the fan does nothing.

[Flash2]

can anyone on here decipher crashers brilliant description
Yeah, he is basically telling you what I already said....check the power supply to the fuses.

If you find there is no 12v power supply to SC38, check the fuse that supplies power to SC38, which is...."SB29 in models with the E-Box low like yours". E-Box is Volkswagen speak for engine bay fusebox.


can anyone tell me which ones these are ?
Fuse locations are shown at the link in post #8 (http://www.vwaudiforum.co.uk/forum/usertag.php?do=list&action=hash&hash=8) .

[whiteakita1]

Any help please crasher on which/where the X relay is so I can change it.

[whiteakita1]

I have removed/checked every single fuse I can find and they are all ok.

[whiteakita1]

Fuse sc38 has no power, which fuse in the engine bay powers that ?
I

[whiteakita1]

Which one is sb29?

[whiteakita1]

Ok I found sb29 and swapped it with the identical fuse next to it and nothing has changed.
I still have no power to sc38.
Heater fan and windscreen washers don't work.
Wipers do work.
What have I got left to check ?

[whiteakita1]

Surely it's got to be this elusive relay ?

[Crasher]

Does fuse SB29 have power?

[Crasher]

If it was the relay that supplies SB29, the J317 "terminal 30 voltage supply relay" lots of other systems would not work.

[whiteakita1]

Just checked, sb59 does have power

[whiteakita1]

Guess I have a wiring issue

[Flash2]

Guess I have a wiring issue
If SB29 has power (and the fuse isn't blown), but no power is getting to fuse SC38 that means the wiring between the two fuseboxes is open circuit/broken.

I'd suggest removing the engine bay fusebox and check for signs of water ingress in the connector on the bottom of the fusebox. You'll see that the terminals on the bottom of the fusebox are numbered. The output of SB29 is on terminal 2 (assuming an E-Box Low).

35344

[whiteakita1]

Thank you, job for tomorrow.

[whiteakita1]

just been out and checked the fuse box and it is bone dry underneath, i give the terminals a light rub with emery paper even though they were very clean, still the same.
plugged vcds in and still no fault codes, done some output tests for the heater vents ect and all ok, fan status changes between on and off as i turn the fan from positions 1,2,3,4 to 0.
so the car thinks everything is fine and working 100% which it obviously isnt.
what could it be ?

[Crasher]

Just checked, sb59 does have power

You mean SB29.

You now need to know if you have the early or late wiring, that is between SB29 and SC38, is the wire black or red/green as early is direct SB29 to the C fuse board bus bar for SC38 but the late system goes to terminal 3 of the relay plate for the J59 X relay, to be honest looking at this diagram doesn't make sense and I need to get off home and I don't have ELSA at home anymore, I will take my hard drive home and stick ELSA on the lap and hope Mrs Crasher doesn't see it , she is away hiking.

[whiteakita1]

if you can let me know please where the x relay is and i will just change it, if its not that i will have to take it to an auto electric place.
thanks everyone so far for all the help.

[Flash2]

It might be worth using your multimeter to check that there is continuity between one of the terminals at SB29 and terminal 2 under the fusebox, just to rule out a failure within the fusebox itself. There should obviously be continuity between one side of the fuse and the connector.

x relay is behind the dash on the drivers side, number 644....see below. The power supply should be on the 30 terminal (sometimes marked as terminal 3 on VW relays). The relay terminal numbers are shown on the bottom of the relay.

https://data.motor-talk.de/data/galleries/0/429/1721/73511077/208393890-w988-h556.jpg

[whiteakita1]

thanks for that, what i did notice after a hour long drive is that all them relays were warm apart from relay 644, thats probably because its got no power going to it so i dont think changing it is going to help me.
im now in over my head and will have to put it into an auto electricians i think as electrics are like magic to me ha.

[whiteakita1]

i dont have that 646 relay next to the 644 relay for some reason.

[Flash2]

i dont have that 646 relay next to the 644 relay for some reason.
If you look at the fuse & relay info posted way back at the start of the thread you will see that the relay next to 644 is the "Trailer voltage supply relay", so I assume your car didn't come with a factory fitted towbar.

Remember to post back and let us know what the sparkie finds wrong with it. I'm sure the next guy to join the forum with the same issue will appreciate it.

[whiteakita1]

Well a mobile auto electrician came out today, he basically couldn't help me any more than you guys already have , he said he thinks it must be a broken wire between the 2 fuse boxes.
I thought that there was no power getting to the 40amp fuse in the dash but with the fuse removed it is getting 1.7v the same voltage as I tested at the blower terminals.
Crasher asked for the wire colours behind the 40amp fuse in the dash and 1 is red/black and 1 is red/yellow.
Why would it only be getting 1.7v ?
Any more help would be great guys otherwise I'm really stuck.

[whiteakita1]

Pic of wires, hope it works35369

[UMEL]

The washer fuse, #40 (http://www.vwaudiforum.co.uk/forum/usertag.php?do=list&action=hash&hash=40) , is 20 amp, second row up from bottom, right hand yellow.

35371

[whiteakita1]

Every single fuse has been tested, I have never found a failed one.

[whiteakita1]

can i just run a 12v power supply to the 40amp dash fuse that is currently only getting 1.7v ?
if so i could just put a jumper wire over from the fuse next to it.

[whiteakita1]

Fixed it !!!!
Well it's working anyway, I just used the power from another free fuse socket which took me about 1 minute !
Thanks to everyone that helped me.

[UMEL]

That's good news indeed. The correct wires must be fairly substantial so it makes one wonder how they can break. Or do they break, it might be a poor connection somewhere in the system.

[Crasher]

Sorry to drop out, poorly :(

[UMEL]

I had a rethink after my last post. Using the power (jumper) from an adjacent socket means you are using the original sockets wiring so it cannot be damaged.

I gotta ask, are you 100% sure the original fuse was good. If yes that only means the sockets contacts are corroded. Can you get to the socket contacts to give then a good clean.

[Flash2]

Crasher asked for the wire colours behind the 40amp fuse in the dash and 1 is red/black and 1 is red/yellow.
Actually, looking at your picture, those are the colours of the wires on fuse SC28.
Fuse SC38 is the black/red & black/yellow to the left in the pic, which don't seem to exactly match either of the colours on Crasher's diagram.



Using the power (jumper) from an adjacent socket means you are using the original sockets wiring so it cannot be damaged.
I think your making an incorrect assumption here. Looking at the photo again, the power supply to SC38 doesn't seem to be connected to any of the adjacent fuses.


Fixed it !!!!
Technically, you bypassed it.

But at least you got your blower working for now.

[Rossh]

Hi there im new here not sure if im posting in the right place if not my apologies. I have a 2005 vw touran and i have the same problem i have checked the motor it works fine and i have checked all fuses. my water jets arnt working either. Please can anybody shed a little light on what to try next?

[Flash2]

Hi there im new here not sure if im posting in the right place if not my apologies.
Your in the wrong forum, but no worries. Just start a new thread on the Touran forum....link below :

Touran - Sharan - Caravelle (http://www.vwaudiforum.co.uk/forum/forumdisplay.php/14-Touran-Sharan-Caravelle)

[Rossh]

Your in the wrong forum, but no worries. Just start a new thread on the Touran forum....link below :

Touran - Sharan - Caravelle (http://www.vwaudiforum.co.uk/forum/forumdisplay.php/14-Touran-Sharan-Caravelle)

Oopss sorry and thank you