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swagon rear wiper - help needed

1K views 4 replies 3 participants last post by  jug 
#1 ·
Hi
My rear wiper packed in last week on a very frosty morning. I think I might have left it switched on from the previous night and started the car up early to clear the frost from the windows without thinking that the rear wiper blade might be frozen to the screen.

When I stripped the motor down I discovered that the shaft the nylon cog runs on has sheared. It is part of the casing but with a bit of work I have managed to repair it successfully.

My problem is that when it is switched on to do the spray and wipe cycle it works fine but when I switch it to intermittent it jerks about all over the place. Maybe moving 10 degrees or so at a time.

Has anyone else experienced this? Is it likely to be the control unit fitted to the wiper motor and if it is can they be sourced on their own?

Any help would be appreciated.

Cheers.

David
 
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#2 ·
Anyone?
 
#3 ·
You can test the unit easily enough if it is off the car - seems odd that it works ok with one type of activation but not another - is this down to the screen being dry (drier) when you test without the rear washer?

The three pin connector is wired earth, switched live, permanent live.
The pin furthest away from the wiper arm shaft is the earth.
(this can be verified by removing the PCB cover and trace the circuit board - the pin that links to a motor supply directly is the earth).

Jumping on the thread I have 2 problems with the rear wiper operation:
1. The rear wiper motor has insufficient torque to operate with the wiper resting on the rear screen (commutator / brushes likely)
2. The rear wiper is only activated by selecting rear wash+wipe - I suspect this is a column switch issue.

I'm expecting the commutator will be burnt out when I prise the motor apart - has anyone cross-matches a 156 SW rear wiper motor to a Fiat equiv?

TIA
Stu
 
#4 ·
BTW the 156 rear wiper motor is basically the same unit as a Mk1 Punto - there are differences as follows:
1. The controller (plastic housing slots onto the metal body) has different connectors onto the wiring harness. You would need to change the plug on the harness, adapt the wiring or use the controller off your original unit (as I did).
2. The Punto unit has a plastic assy that fits over the spindle as is retained by a circlip - you need to remove that to allow fitting to a 156.

Oh and the biggest difference is that Punto wiper assys are far more readily available :thumbs:
 
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