Rear Wiper Arm Replacement

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Joined
Jul 12, 2026
Threads
4
Messages
14
Location
Tucson, Arizona
Childs play, I know, but the old arm was bent and the blade barely made contact with the glass. Something I noticed before replacing the old one and after replacing with the new OEM one is that the wiper arm doesn't like to return to its regular resting position unless I time the off switch when the arm is very close to the bottom of its arch. It's a 16 inch blade and if I stop it when it's in the upward arch, It will stop at the very top. If I switch it off on the way down, but towards the top, it will stop wherever it happens to be instead of returning to the resting place. Ran this through ChatGPT and here is the answer;

"1. Dirty or worn park contacts (most likely)​

Inside the motor gearbox is a rotating contact plate that tells the motor when it has reached the park position.

After 26 years:

  • The grease hardens.
  • The copper contacts oxidize.
  • The park switch loses electrical continuity.
The result is exactly what you're seeing—the motor no longer knows where "park" is.

This is a very common failure on older Toyotas and Lexuses."

OK, cool. Can anyone tell me if pulling the rear wiper motor to clean the contacts is a one banana job? I don't mind doing it but at the same time, if its a pain in the butt, I'm also content just timing my rotation on the wiper stick to turn the arm off at the bottom of the arch.
 
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