Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2012IS 250C V6-2.5L (4GR-FSE)REPAIR AND DIAGNOSISWINDOWS AND GLASSWINDOWSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESDRIVER SIDE POWER WINDOW AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH
2012 Lexus IS 250C V6-2.5L (4GR-FSE)
Driver Side Power Window Auto Up / Down Function Does Not Operate With Power Window Master Switch
2012 Lexus IS 250C V6-2.5L (4GR-FSE)SECTION Driver Side Power Window Auto Up / Down Function Does Not Operate With Power Window Master Switch
WINDOW / GLASS: POWER WINDOW CONTROL SYSTEM: Driver Side Power Window Auto Up / Down Function does not Operate with Power Window Master Switch
- Driver Side Power Window Auto Up / Down Function does not Operate with Power Window Master Switch
DESCRIPTION
* If the pulse sensor on the power window regulator motor assembly (for driver side) malfunctions, the regulator will enter fail-safe mode, and the auto up and down function will not operate.
* If the power window initialization Initialization has not been performed, the auto up and down function will not operate.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* When the power window regulator master switch assembly is removed, the power window control system must be initialized Initialization.
* The power window control system uses a BEAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting How To Proceed With Troubleshooting. Troubleshoot the power window control system after confirming that the communication system is functioning properly.
PROCEDURE
1. CHECK POWER WINDOW CONTROL SYSTEM (LED ILLUMINATION CHECK (for Driver Side))
(a) Turn the engine switch on (IG).
(b) Operate the power window regulator master switch assembly's driver side switch for 2 seconds or more.
(c) Check the blinking pattern of the LED illumination. Compare the blinking pattern with the following illustration.
HINT
If there is a malfunction in the pulse sensor, manually operating the power window regulator master switch assembly or power window regulator switch assembly will cause the power window regulator master switch assembly or power window regulator switch assembly LED illumination to blink. The LED illumination continues to blink for 45 seconds or until the engine switch is turned off. After 45 seconds, the power window regulator master switch assembly or power window regulator switch assembly LED illumination remains on.
Result:
B -- REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY Removal
C -- CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (PULSE SENSOR SIGNAL)
A -- Continue to next step.
2. PERFORM INITIALIZATION (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY)
(a) Initialize the power window regulator master switch assembly Initialization.
NEXT -- Continue to next step.
3. CHECK AUTO UP / DOWN FUNCTION (for Driver Side)
(a) Check that the auto up and down function using the power window regulator master switch assembly operates the driver door window Operation Check.
OK:
Driver door auto up and down function operates normally.
NG -- CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (PULSE SENSOR SIGNAL)
OK -- END (INITIALIZATION WAS INCORRECT)
4. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (PULSE SENSOR SIGNAL)
(a) Turn the engine switch on (IG).
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (PULSE SENSOR POWER SOURCE)
OK -- REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY Removal
5. INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (PULSE SENSOR POWER SOURCE)
(a) Turn the engine switch on (IG).
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY Removal
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (MASTER SWITCH - REGULATOR MOTOR (for Driver Side))
(a) Disconnect the power window regulator master assembly connector.
(b) Disconnect the power window regulator motor assembly (for driver side) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Side) Removal
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.