Power Windows: Other Lexus LS III

POWER WINDOW SYSTEM

1. "One-Touch" (Automatic) Operation Of Windows To partially raise or lower the window, press window switch slightly and hold until window is at desired level. To fully raise or lower window without having to hold window switch down, press switch firmly and release. This function is referred to as "one-touch" mode. "One-touch" mode is controlled by door ECU.
2. Key Off Operation The windows can be operated for about one minute after ignition is turned off, or until any door is opened.
3. Door Key Cylinder Operation The windows can be operated using key in driver's door key cylinder. To close windows, turn key counterclockwise in driver's door key cylinder for more than 1.5 seconds. To open windows, turn key clockwise in driver's door key cylinder for more than 1.5 seconds.

POWER WINDOW SWITCHES

1. Master Switch All windows can be controlled from the master switch on driver's door panel. An individual switch on the master switch controls the driver's window. All other individual switches control the passenger's windows.
2. Passenger Switches Each passenger's door is equipped with an individual window switch.
3. Window Lock Switch When the button for window lock switch (located in master switch assembly) is depressed, passenger windows cannot be operated from the master switch or the passenger switches. Only the driver's window can be operated.

MASTER SWITCH CIRCUIT

1. Check master switch. See «MASTER SWITCH»(ref-27166-S21120658722001010800000) under COMPONENT TESTS. Repair as necessary. If master switch is okay, go to next step.
2. Check wiring harness and connectors between master switch and driver door ECU. See «WIRING DIAGRAMS»(ref-27166-S37364101052001010800000) . Repair as necessary. If wiring harness and connectors are okay, perform check for next fault listed under appropriate symptom. See «TROUBLE SHOOTING»(ref-27166-S16242051882001010800000) .

Scheme 6

1. Check MPX-B1, MPX-IG and D DOOR fuses. Replace as necessary. If fuses are okay, go to next step.
2. Turn ignition on. Measure voltage (backprobe) between driver door ECU connector "B" terminals No. 1 (White/Black wire) and No. 5 (Red/Blue wire). (Scheme 6) Battery voltage should be present. Turn ignition off. Disconnect driver door ECU connector. Measure voltage between connector terminals No. 1 (White/Black wire) and No. 4 (Violet/Yellow wire), and between terminals No. 1 (White/Black wire) and No. 6 (Red wire). Battery voltage should be present. If voltages are not to specification, go to next step. If voltages are to specification, check driver door ECU. See BODY CONTROL SYSTEMS - LS430 and MULTIPLEX CONTROL SYSTEMS - LS430 articles.
3. If voltages are not to specification, check wiring harness and connectors between master switch and driver door ECU, and between ECU and ground. See «WIRING DIAGRAMS»(ref-27166-S37364101052001010800000). Repair wiring as necessary.

WINDOW MOTOR CIRCUIT

1. If Lexus hand-held tester is not available, go to next step. If Lexus hand-held tester is available, attempt to operate window motor in ACTIVE TEST mode. If window motor operates, perform check for next fault listed under appropriate symptom. See «TROUBLE SHOOTING»(ref-27166-S16242051882001010800000) . If window motor does not operate, go to next step.
2. Check window motor. See «WINDOW MOTOR»(ref-27166-S16795469352001010800000) under COMPONENT TESTS. Repair as necessary. If window motor is okay, go to next step.
3. Check wiring harness and connectors between window motor and appropriate door ECU. See «WIRING DIAGRAMS»(ref-27166-S37364101052001010800000) . Repair as necessary. If wiring harness and connectors are okay, perform check for next fault listed under appropriate symptom. See «TROUBLE SHOOTING»(ref-27166-S16242051882001010800000) .

Driver's Window

Disconnect window motor harness connector. Connect voltmeter positive lead to window motor harness connector terminal No. 6 (Violet/Green wire) and negative voltmeter lead to terminal No. 3 (Brown/White wire). Apply positive battery voltage to window motor harness connector terminal No. 4 (Red/Green wire) and connect negative battery lead to terminal No. 5 (Green wire). see scheme 3 Pulse should be generated with window motor running. Reverse polarity of battery leads. Pulse should be generated with window motor running in opposite direction. If generated pulse is not as specified, replace window motor assembly.

Front Passenger's Window

Disconnect window motor harness connector. Connect voltmeter positive lead to window motor harness connector terminal No. 1 (Brown/White wire) and negative voltmeter lead to terminal No. 3 (Violet/Green wire). Apply positive battery voltage to window motor harness connector terminal No. 4 (Red/Green wire) and connect negative battery lead to terminal No. 5 (Green wire). see scheme 3 Pulse should be generated with window motor running. Reverse polarity of battery leads. Pulse should be generated with window motor running in opposite direction. If generated pulse is not as specified, replace window motor assembly.

Left Rear Window

Disconnect window motor harness connector. Connect voltmeter positive lead to window motor harness connector terminal No. 3 (Yellow/Red wire) and negative voltmeter lead to terminal No. 5 (Brown/Black wire). see scheme 3 Apply positive battery voltage to window motor harness connector terminal No. 2 (Red wire) and connect negative battery lead to terminal No. 1 (Green wire). Pulse should be generated with window motor running. Reverse polarity of battery leads. Pulse should be generated with window motor running in opposite direction. If generated pulse is not as specified, replace window motor assembly.

Right Rear Window

Disconnect window motor harness connector. Connect voltmeter positive lead to window motor harness connector terminal No. 3 (Yellow/Red wire) and negative voltmeter lead to terminal No. 5 (Brown/Black wire). see scheme 3 Apply positive battery voltage to window motor harness connector terminal No. 1 (Red wire) and connect negative battery lead to terminal No. 2 (Green wire). Pulse should be generated with window motor running. Reverse polarity of battery leads. Pulse should be generated with window motor running in opposite direction. If generated pulse is not as specified, replace window motor assembly.

MASTER SWITCH

Remove master switch. Check for continuity between specified terminals of master switch. Ensure continuity is as specified in appropriate switch positions. (Scheme 7) See MASTER SWITCH CONTINUITY TEST table. If continuity is not as specified, replace master switch.

Scheme 7

MASTER SWITCH CONTINUITY TEST

MASTER SWITCH ILLUMINATION

Remove master window switch. Ensure window lock switch is in unlock position. Apply battery positive voltage to terminal No. 18 and battery negative voltage to terminal No. 10 at master window lock switch. (Scheme 7) Ensure switch is illuminated. Press master window lock switch. Reverse leads. Ensure switch is no longer illuminated. If operation is not as specified, replace master window switch.

PASSENGER SWITCH

Remove appropriate passenger window switch. Check for continuity between specified terminals of switch. (Scheme 8) Ensure continuity is as specified in appropriate switch positions. See PASSENGER SWITCH CONTINUITY TEST table. If continuity is not as specified, replace window switch.

Scheme 8

PASSENGER SWITCH CONTINUITY TEST

Driver's & Front Passenger's Window

1. Disconnect window motor harness connector. Apply positive battery voltage to terminal No. 5 and connect negative battery lead to terminal No. 4 at motor window harness connector. see scheme 3 Window motor should turn clockwise. Reverse polarity of voltage to window motor. Window motor should turn counterclockwise. If operation is not as specified, replace window motor.
2. If battery voltage continues to be applied to window motor after window has stopped moving, a thermistor inside window motor should open in 4-90 seconds and window motor should stop. After thermistor opens, reverse polarity of voltage to window motor.
3. Within 60 seconds, window motor should turn in opposite direction, indicating thermistor has closed. If operation is not as specified, replace window motor.

Left Rear & Right Rear Passenger's Window

1. Disconnect window motor harness connector. Apply positive battery voltage to terminal No. 1 and connect negative battery lead to terminal No. 2 at window motor harness connector. see scheme 3 Window motor should turn clockwise. Reverse polarity of voltage to window motor. Window motor should turn counterclockwise. If operation is not as specified, replace window motor.
2. If battery voltage continues to be applied to window motor after window has stopped moving, a thermistor inside window motor should open in 4-90 seconds and window motor should stop. After thermistor opens, reverse polarity of voltage to window motor.
3. Within 60 seconds, window motor should turn in opposite direction, indicating thermistor has closed. If operation is not as specified, replace window motor

Scheme 9

1. Disconnect negative battery cable. Cover screwdriver tip with tape and pry off inside door handle bezel. Carefully pry up armrest base panel assembly. Remove 3 window regulator master switch assembly screws. Remove window regulator master switch. Remove 2 screws and separate upper and lower armrest base panels. (Scheme 9)
2. Remove courtesy light. Remove 7 door trim panel screws. Carefully pry door trim panel away from door to release retainer clips. Disconnect 2 cables from inside handle. Remove inside door handle, seat memory switch, duct and vent seal, door trim pocket assembly, door frame garnish, outside rear view mirror, door speaker and door ECU.
3. Remove service hole cover. Pry off door belt moulding. Drill out 5 door glass run rivets. Remove door glass run. Insert a rag inside door panel to avoid scratching glass. Raise glass until 2 bolts appear in service hole. Remove bolts and pull glass upward to remove.
4. Disconnect window motor harness connector. Remove 6 bolts securing window motor and regulator assembly. Remove assembly through service hole. Place mating marks on window regulator motor bracket and regulator gear. Using Torx wrench, remove 3 screws and motor. To install, reverse removal procedure.