Gs300h failed wiper motor strip down

[Pops1]

Have had problems with the wipers on my 2014 gs300h for a long time, they would randomly stop working but switching off and on again they would work again with no problems, I thought it may be similar to the issue some have of parking in the wrong positions so I replaced both relays but this eventually didn't solve the problem, probably took 18 months of intermittent failure before they finally gave up for good so I replaced the motor and linkages with a used set from a low mileage gs450h, I was a bit doubtful as the replacement motor was smaller in size but they worked perfectly. 

Today, due to boredom I dismantled the wiper motor to see the condition of the internals, the only thing found was the brushes were worn out, I'm sure they could be replaced if really needed brushes worn well down armature could be saved possibly found this wear on the armature this wear is opposite and at the other end of the armature, I can't find corresponding marks on the magnets so I'm thinking they may be something to do with balancing the shaftbrush worn at a angleall brushes well wornas usual, toyota part numbers on a lexus

[Shahpor]

Excellent info, thanks John 👍

Strange problem though and the first I am hearing of this happening on the GS.

[Beamish]

 

Hi John,

Thanks for posting that. 

Do you mind if I ask at roughly what mileage this happened?  I know the west of Ireland is not hte driest place on earth but that seems an awfull lot of wear and tear.

Thanks,

Dec.

[200h]

your correct tyhe marks are for balancing the armature

[Herbie]

If you clean up the commutator and undercut the insulation between segments (used to be mica but I don't know if it still is or not), give it a general clean-up and replace the brushes, that'll be as good as new.

[Pops1]

On 1/29/2022 at 3:54 PM, Beamish said:

 

Hi John,

Thanks for posting that. 

Do you mind if I ask at roughly what mileage this happened?  I know the west of Ireland is not hte driest place on earth but that seems an awfull lot of wear and tear.

Thanks,

Dec.

Car has approx 140000miles,was originally English before being imported into Ireland, car is basically trouble free thankfully but the wipers were a real headache, always thought it was the relays that were the problem because my sons is300h had similar fault but new relays fixed it for him. For me, eventually they stopped working completely so the easiest way was to find a used replacement 

[Pops1]

On 1/31/2022 at 5:10 PM, Herbie said:

If you clean up the commutator and undercut the insulation between segments (used to be mica but I don't know if it still is or not), give it a general clean-up and replace the brushes, that'll be as good as new.

Ya that's what I was thinking but it's replaced a good while now, it was due to boredom that I was in the shed doing a bit of a tidy up and came across the motor so I thought I might as well have a look to see what it was like. I posted the strip down in the hope it might be of help to anyone with the same problem