Wiper Motor Control Module

[Guest karimata]

Hi, can any of you help me out with this-

 

Front windscreen wipers decided to fail last week.... When you first turn the ignition on they 'jump' a few inches then stop.

 

Have checked the wiper fuse-OK.

Have checked the wiper delay relay- OK.

Have tried the Wipers on all control positions.

Have removed the wiper motor and applied power- wiper motor is fine.

 

I can only presume the Bosch wiper motor control module has failed. I am unable to test this as I do not have a pin out for the 5w connector on the module. I've checked it out and there is no water ingress, the connectors look fine, and there are no obviously burnt out components on the PCB.

 

Is there anything else it could be? I have rung 20+ vehicle scrap dealers who inform me that as soon as they get a Galaxy in all the modules (especially the wiper and central locking) are sold off really quickly.

The Ford garage does not even recognise the existance of this module, and I'm sure would like me to part with a couple of hundrfed quid if they did.

 

If anyone has the pin out for the connector to the module it would enable me to test it out.

 

Any help much appreciated...

[seatkid]

Hmmm let me see...;)

 

Pin 1 Brown Ground

 

Pin 2 Black +12V from K175 Wiper relay

 

Pin 3 White power to Wiper motor

 

Pin 4 Violet power to Wiper motor

 

Pin 5 Green +12v in when Slow or one touch selected

 

Pin 6 Red +12v in when Fast selected

 

If you have a meter you should be able to see if the module is getting the right inputs (1=0V,2=+12V ,5 or 6=+12v depending on speed)

 

You should be able to get the module seperately..

 

Are you sure the mechanism is not jamming/overloading the module as I think it may have overload protection?

 

This TIS may be of interest too

[Guest karimata]

Thanks Seatkid.

 

I'll check the module out before parting with any money for a new one. VW are quoting

[seatkid]

There are 2 fuses F5 (10A Red) and F24 (30A Green).

[Guest karimata]

Seatkid-

Thanks for the fuse numbers-

When I checked the fusebox again F5 (10A) is ok

F24 doesnt exist.... On the embossed Fuse Table on the cover of the fusebox it only goes up to F23 (Radio)

Is F24 located somewhere else?

 

 

Neil_Wiles-

Thanks for the info.

The motor is currently disconnected from the wiper linkage but still stalls. I've cleaned the motor up and it works fine when power is applied directly to it so I don't think the motor is overloading anything. I'll clean the pivots up anyway if they are prone to seize in the future.

 

It looks like the motor has a copper track inside it that sends a voltage back to the wiper control module when the wiper sweep has finished, so the module can presumably then reverse the voltage to the motor. It looks like the motor is receiving +12v on both of its inputs at the moment which obviously isn't going to work....

[seatkid]

There are several fuse layouts depending on the year of manufacture. In my 96 Seat Alhambra manual it says that F24 is located above the relays.

 

 

On 95 to late 97 models, F24 (Green 30A) is the main supply fuse which supplies the K175 wiper relay. See later post for layout diagram.

 

 

The following 2 pics are not of interest to Karimata but I'll leave them for reference. On 98 to mid 2000 models, the layout and numbering is as in the pics below.

Edited February 25, 2004 by seatkid

[seatkid]

fusebox 98 Alhambra

[Guest Turbo]

I had the same fault as Neil. The wipers kept stopping. The alloy casing or pivot (where the wiper arm shafts go into) does seize up. Try removing the wipers and switching the motor on. I wouldn`t be surprised if they have partially seized. Remove the small clip and rubber sealing washer, then spray WD40 or get a thin oil in there. Keeping the wiper mechanism going allows the oil to work in better. I am going to overhaul mine to prevent it happening again.

[Guest karimata]

Thanks for the fusebox images Seatkid and the info Turbo.

 

My fusebox layout is different to that shown, but from reading other posts there is plenty of variation in the fusebox layouts between models, even to the extent the layout in the manual is incorrect.

 

I have however checked all my 30A fuses, and they are all good. Motor is definately fine, loom wiring is good, linkages and pivots running freely. All connectors clean and working. No dry joints on module.

 

 

I think it's time to order that wiper contol module.....

[seatkid]

Wait a moment, I didn't make it clear there are two relays too. The wiper (main) relay K175 and the intermittent (delay) wiper relay K11. It sounds as if you havent checked K175 yet, location as below (I finally found fuse relay layout diagram for 95 - late 97 models)

[Guest karimata]

This is the correct fusebox layout for my model. Checked K175 and is ok.

Have picked up the new module from the VW dealership and just fitted it.

 

Result!

 

 

So it was the module after all.

 

 

 

 

Many thanks for everyones help

 

Jim.