Power Windows: Other Lexus RX I

Catching Prevention (Jam Function)

In the event an object is caught in area of window travel during upward movement, power window motor will reverse direction as a safety measure. If point of window resistance is such that window opening is greater than 7.874" (200 mm), window will automatically lower 1.969" (50 mm) and stop. If point of resistance is such that window opening is 7.874" (200 mm) or less, window will automatically lower until opening is 7.874" (200 mm) and stop.

Master Switch

All windows can be controlled from master switch on driver's door panel. One of the individual switches on master switch controls driver's window. All other individual switches control passenger's windows. Master switch is integral with driver door ECU.

Passenger's Switch

Individual window switches are located on door panel of each passenger door. Front passenger's switch is integral with passenger door ECU. Rear passenger switches are separate from passenger door ECUs.

Window Lock Switch

When button for window lock switch (located in master switch assembly) is depressed, passenger windows cannot be operated from master switch or passenger's switches. Only driver's window can be operated.

POWER WINDOW MOTOR LIMIT SWITCH

With window motor removed from regulator assembly, connect motor to vehicle harness. rotate motor 6-10 turns or 4-5 seconds in upward window direction. This sets limit switch to OFF position (TDC of window glass).

JAM PROTECTION LIMIT SWITCH CIRCUIT

1. Using scan tool in DATA LIST mode, check jam protection limit switch. If results are okay, circuit is okay at this time. If results are not okay, go to next step.
2. Check jam protection limit switch. See «JAM PROTECTION LIMIT SWITCH»(ref-4409-S15866387472000062200000) under COMPONENT TESTS. Repair as necessary. If switch is okay, go to next step.
3. Check wire harness and connectors between jam protection limit switch and appropriate door ECU. See «WIRING DIAGRAMS»(ref-4409-S42575240182000062200000) . Repair as necessary. If wire harness and connectors are okay, circuit is okay at this time.

JAM PROTECTION PULSE SWITCH CIRCUIT

1. Check jam protection pulse switch. See «JAM PROTECTION PULSE SWITCH»(ref-4409-S17737809002000062200000) under COMPONENT TESTS. Replace window motor as necessary. If jam protection pulse switch is okay, go to next step.
2. Check wire harness and connectors between jam protection pulse switch and appropriate door ECU. See «WIRING DIAGRAMS»(ref-4409-S42575240182000062200000) . Repair as necessary. If wire harness and connectors are okay, circuit is okay at this time.

ONE-TOUCH SYSTEM CIRCUIT

1. Disconnect driver door ECU harness connector. Using an ammeter, connect positive lead to terminal No. 1 of harness connector, and negative lead to negative terminal of battery. (Scheme 5) Using a jumper wire, connect battery positive to terminal No. 15 at harness connector.
2. As window travels downward, amperage should be about 7 amps. Ensure amperage increases to 14.5 amps or greater when window reaches end of travel. With voltage still applied, amperage should decrease to less than one amp within 4-90 seconds as thermistor inside window motor opens. If operation is not as specified, replace window motor.

Scheme 5

REAR WINDOW SWITCH CIRCUIT

1. Using scan tool, check for body control ECU DTCs. If DTCs B1225 or B1226 are present, rear window switch, door lock control switch or related wire harness is faulty. Repair as necessary. If DTCs are not present, go to next step.
2. Check window switch. See «WINDOW SWITCH»(ref-4409-S19091700702000062200000) under COMPONENT TESTS. Repair as necessary. If window switch is okay, go to next step.
3. Check wire harness and connectors between appropriate window switch and rear door ECU. See «WIRING DIAGRAMS»(ref-4409-S42575240182000062200000) . Repair as necessary. If harness and connectors are okay, go to next step.
4. Check wire harness and connectors between appropriate rear window switch and master switch. See «WIRING DIAGRAMS»(ref-4409-S42575240182000062200000) . Repair as necessary. If harness and connectors are okay, circuit is okay at this time.

WINDOW MOTOR CIRCUIT

1. Using scan tool in ACTIVE TEST mode, operate windows. If windows operate, circuits are okay at this time. If window(s) do not operate, go to next step.
2. Check appropriate window motor. See «WINDOW MOTOR»(ref-4409-S39609683252000062200000) under COMPONENT TESTS. Replace if necessary. If window motors are okay, go to next step.
3. Check wire harness and connectors between appropriate window motor and door ECU. See «WIRING DIAGRAMS»(ref-4409-S42575240182000062200000) . Repair as necessary. If wire harness and connectors are okay, circuits are okay at this time.

Driver & Front Passenger Windows

1. Disconnect window motor harness connector. Connect ohmmeter between terminals No. 4 and 5 of motor connector. (Scheme 6) Using jumper wires, connect battery positive to terminal No. 1 and battery negative to terminal No. 2. Continuity should be present as window travels upward. Ensure continuity is not present when window is in fully closed position.
2. Reverse polarity of voltage to motor. Continuity should be present as window travels downward. Ensure continuity is not present when window is in fully open position. If continuity is not as specified, replace window motor.

Scheme 6

Rear Passenger Windows

1. Disconnect window motor harness connector. Connect ohmmeter between terminals No. 2 and 6 of motor connector. (Scheme 7) Using jumper wires, connect battery positive to terminal No. 3 and battery negative to terminal No. 1. Continuity should be present as window travels upward. Ensure continuity is not present when window is in fully closed position.
2. Reverse polarity of voltage to motor. Continuity should be present as window travels downward. Ensure continuity is not present when window is in fully open position. If continuity is not as specified, replace window motor.

Scheme 7

1. Disconnect window motor harness connector. Connect DVOM set to measure frequency between terminals No. 4 and 6 of motor connector. (Scheme 8) Using jumper wires, connect battery positive to terminal No. 1 and battery negative to terminal No. 2. Ensure a pulse is generated as window motor operates.
2. Reverse polarity of voltage to motor. Ensure a pulse is generated as window motor operates in opposite direction. If operation is not as specified, replace window motor.

Scheme 8

1. Disconnect window motor harness connector. Connect DVOM set to measure frequency between terminals No. 3 and 5 of motor connector. (Scheme 9) Using jumper wires, connect battery positive to terminal No. 1 and battery negative to terminal No. 2. Ensure a pulse is generated as window motor operates.
2. Reverse polarity of voltage to motor. Ensure a pulse is generated as window motor operates in opposite direction. If operation is not as specified, replace window motor.

Scheme 9

1. Disconnect window motor harness connector. Apply battery voltage and ground between motor connector terminals No. 1 (Red wire) and No. 2 (Green wire). Motor should operate. To reverse motor direction, reverse polarity of voltage to motor.
2. Using an ammeter in series with 12-volt source and window motor, monitor amperage as window reaches end of its travel. Continue to apply voltage. In 4-90 seconds, thermistor inside window motor should open and amperage should decrease to less than one amp.
3. Wait 60 seconds, and then reverse polarity of voltage to motor. Window should travel in opposite direction. With voltage still applied at end of window travel, amperage should decrease to less than one amp within 4-90 seconds. If operation is not as specified, replace window motor.

1. Disconnect window motor harness connector. Apply battery voltage and ground between motor connector terminals No. 1 (Green wire) and No. 3 (Red wire). Motor should operate. To reverse motor direction, reverse polarity of voltage to motor. Replace motor if it does not operate as specified.
2. Using an ammeter in series with 12-volt source and window motor, monitor amperage as window reaches end of its travel. Continue to apply voltage. In 4-90 seconds, thermistor inside window motor should open and amperage should be less than one amp.
3. Wait 60 seconds, and then reverse polarity of voltage to motor. Window should travel in opposite direction. With voltage still applied at end of window travel, amperage should decrease to less than one amp within 4-90 seconds. Replace motor if it does not operate as specified.

WINDOW SWITCH

Remove window switch. Using DVOM, check for continuity between terminals of window switch. (Scheme 10) Ensure continuity is as specified between appropriate terminals in indicated switch positions. See WINDOW SWITCH CONTINUITY SPECIFICATIONS table. If continuity is not as specified, replace window switch.

WINDOW SWITCH CONTINUITY SPECIFICATIONS

Scheme 10

WINDOW SWITCH ILLUMINATION

Remove window switch. Apply battery positive to switch terminal No. 3, and battery negative to switch terminal No. 2. (Scheme 10) Switch should illuminate. If operation is not as specified, replace window switch.