Question about 1990 Lexus LS 400

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Power windows not working.

Hi, the power windows for my 1990 LS 400 stopped working suddenly. I checked to see if I had window lock on and I didn't. I am unable to operate any of the windows from the driver's seat, the windows themselves also cannot be moved up or down from each passenger seat.

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  • Expert
  • 273 Answers

Check your fuses would be 1st thing to do

Posted on Jun 03, 2009

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Posted on Jan 02, 2017

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1 Answer

Which Relay/Fuse controls the power windows?


Did you check for battery voltage at the switch , with a volt meter before you replaced the main driver door switch ? Maybe you'll want to take this to pro ,instead of just replacing parts !
Symptom Chart Condition Possible Sources Action
  • No communication with the smart junction box (SJB)
  • Circuitry
  • SJB
  • REFER to Section 419-10 .
  • A single power window is inoperative - driver front power window is inoperative/does not operate correctly
  • Power window motor regulator and motor
  • Circuitry
  • Window control switch
  • Smart junction box (SJB)
  • Go To Pinpoint Test A .
  • A single power window is inoperative - passenger front, left rear or right rear
  • Power window motor regulator and motor
  • Circuitry
  • Window control switch
  • Go To Pinpoint Test B .
  • All power windows are inoperative
  • Smart junction box (SJB) fuse 30 (10A)
  • SJB circuit breaker 10 (30A)
  • Circuitry
  • Delayed accessory relay
  • Battery saver relay
  • Driver window control switch
  • SJB
  • Go To
PINPOINT TEST C: ALL POWER WINDOWS ARE INOPERATIVE Test Step Result / Action to Take C1 CHECK FOR CORRECT OPERATION OF THE INTERIOR LIGHTS
  • Turn on the interior lights.
  • Do the interior lights operate normally?
Yes
GO to C2 .

No
To continue diagnosis, REFER to Section 417-02 . C2 CHECK CIRCUIT 400 (LB/BK) FOR VOLTAGE TO THE DRIVER WINDOW CONTROL SWITCH
  • Disconnect: Driver Window Control Switch C504b.
  • Key in ON position.
  • Measure the voltage between the driver window control switch C504b pin 4, circuit 400 (LB/BK), harness side and ground.
    >
  • Is the voltage greater than 10 volts?
Yes
GO to C4 .

No
GO to C3 . C3 CHECK CIRCUIT 400 (LB/BK) FOR AN OPEN OR SHORT TO GROUND
  • Key in OFF position.
  • Disconnect: SJB C2280c.
  • Measure the resistance between the driver window control switch C504b pin 4, circuit 400 (LB/BK), harness side and the SJB C2280c pin 17, circuit 400 (LB/BK), harness side; and between the driver window control switch C504b pin 4, circuit 400 (LB/BK), harness side and ground.
    >
  • Is the resistance less than 5 ohms between the driver window control switch and the SJB; and greater than 10,000 ohms between the driver window control switch and ground?
Yes
Go To Pinpoint Test H

No
REPAIR the circuit. TEST the system for normal operation.

Mar 24, 2015 | 2004 Mercury Sable

1 Answer

1997 lexus ls400 windows,sunroof and horn wont work


For all types of power window problem and power windows not working,i suggest you to go through the help links given below. Click the link to go through its procedure to troubleshoot the problem :------

Power window problem
http://repairhelpcenter.blogspot.com/2012/01/pontiac-grand-am-power-window-not.html
------------

Power windows not working after car wash?http://howtobyme.blogspot.com/2011/11/power-windows-not-working-after-car.html
---------

power locks, power window and power mirror not working?
http://howtobyme.blogspot.com/2011/09/power-locks-power-window-and-power.html
------------
All power windows not working?
http://howtobyme.blogspot.com/2011/09/all-power-windows-not-working-on-2003.html
------------
How to remove window motor and regulator on Car?
http://howtobyme.blogspot.com/2011/09/how-to-remove-window-motor-and.html

-------------

Complete Diagnosis & Testing Power Windows?

http://repairhelpcenter.blogspot.in/2012/02/diagnosis-testing-power-windows.html
-----------This will help.Thanks.

Jan 30, 2012 | 1997 Lexus LS 400

1 Answer

Power steering draining out


they are bad about pumps leaking into alternatorand shorting out .the high pressure hose from pump to rack and pinion are also bad about leaking. the racks will leak around 100k.

May 16, 2009 | 1990 Lexus LS 400

3 Answers

1990 LS 400


Check your fuse box under the hood. A fusible link may be blown. I carelessly crossed jumper cables and ended up with no power to all these components as well. I located and changed the fusible link and everything is back to normal.

Sep 18, 2008 | 1990 Lexus LS 400

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