Toyota power window oddity

Tiny
KELLY COBURN
  • MEMBER
  • 1997 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • 167,000 MILES
Bizarre power window problem 97 corolla:
My wife accidentally shut her hand very hard in the rear driver side power window using that rear switch.
Now all of the power windows still work perfectly fine from the driver's master switch up front, but the rear driver's side window switch will only take the window down, and the rear passenger side switch will only take that window up.

What the heck? Did she blow some wire that is critical only to the rear switches?

Lend me your genius.

Thanks,

Kelly in Colorado
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Sunday, April 3rd, 2011 AT 2:04 AM

2 Replies

Tiny
CARADIODOC
  • EXPERT
There are three possibilities. First check for a broken wire between the driver's door hinges. Could be between the rear door hinges too but the front door gets more use so the wires flex more. Actually, now that I think of it, don't overlook those wires but that can't be the problem. Any broken wire for just the rear window will cause it to not go in either direction from either switch.

Either the driver's or passenger's switch can have a bad contact. Both have four pairs of contacts. When the front switch is pressed for the rear window, current flows through two of the contacts in the rear switch. When the rear switch is pressed, current flows through two contacts in the front switch. Current also flows through two pairs of contacts in the switch that is pressed.

To put it another way, all four pairs of switch contacts in the two switches are grounded when they are at rest. ONE of those contacts is opened, then applied to 12 volts to run the window one way. Return current from the motor flows through the three contacts that are at rest. If any one of those contacts is burned, current can't flow and the window won't move.
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Sunday, April 3rd, 2011 AT 2:24 AM
Tiny
KELLY COBURN
  • MEMBER
Thanks CardioDoc! You were right. I opened both rear switches, found burnt contacts, cleaned them and all is okey-dokey
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Sunday, April 3rd, 2011 AT 8:49 PM

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