Seat: Overview Lexus RX II рестайлинг

SYSTEM DESCRIPTION

1. GENERAL DESCRIPTION The power seat control system is equipped with the following function: The front seats are equipped with electric adjuster slide, reclining, lifter, front vertical and lumbar support adjustment functions. The power seat control system (w/ memory) is equipped with the following functions: Individual seat positions for two different drivers can be stored for the slide, reclining, front vertical and lifter. Similarly, power mirror positions and tilt and telescopic positions for two different drivers can be stored. These are stored/restored together with the seat positions by pushing the seat memory switch. The above operations are performed using the multiplex communication system. As a safety precaution, the system does not allow seat position restoration unless the ignition switch is in the on position and the shift lever is in the P position. Manual adjustment of the lumbar support function can be performed even when the position control ECU and switch assembly (power seat control switch and ECU) is not functional. When the power seat control switch is operated, a command signal is sent to the position control ECU and switch assembly (power seat control switch and ECU). The position control ECU and switch assembly (power seat control switch and ECU) then activates the appropriate seat motor as needed. This memory system does not use a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns. The position control ECU and switch assembly (power seat control switch and ECU) is designed so that a malfunction of the seat memory system will not interfere with seat control. The seat memory switch also sends signals to the position control ECU and switch assembly (power seat control switch and ECU) to memorize a given seat position. Two seat positions can be memorized. The seat memory switch is later used to send signals to the position control ECU and switch assembly (power seat control switch and ECU) to return the seat to either of the memorized positions.
2. FUNCTION OF MAIN COMPONENT (w/ MEMORY) The following functions are available. COMPONENTS FUNCTION Components Function Seat slide motor Slides the driver side seat back and forth based on signals from the position control ECU and switch assembly (power seat control switch and ECU). Seat reclining motor Reclines the driver side seat back and forth based on signals from the position control ECU and switch assembly (power seat control switch and ECU). Seat front vertical motor Moves the front part of the driver side seat cushion up and down based on signals from the position control ECU and switch assembly (power seat control switch and ECU). Seat lifter motor Moves the driver side seat cushion up and down based on signals from the position control ECU and switch assembly (power seat control switch and ECU). This motor operates, and driver side seat rear vertical raises and lowers, and driver side seat rear vertical raises and lowers. Set switch Memory switch When the set and memory switches are pressed simultaneously, SET, 1 or 2 switch signal is input to the power window regulator switch assembly (power window master switch) and sends the seat memory switch signal via the multiplex communication system. When only the memory switch is pressed, SET, 1 or 2 switch signal is input to power window regulator switch assembly (power window master switch) and driver side seat position changes according to memory.
3. SYSTEM OPERATION The front power seats adjustment and position memory are shown in the chart below. SEAT ADJUSTMENT FUNCTION Seat Adjustment Function Driver Side Front Passenger Side Slide Power and memory Power Reclining Power and memory Power Front Vertical Power and memory Power Lifter Power and memory Power Lumbar Support Power Power In the memory function, the memory switch operation signal is transferred from the power window regulator switch assembly (power window master switch) to the position control ECU and switch assembly (power seat control switch and ECU) via the multiplex communication line. Then, either the seat position is stored in memory or the previously stored seat position is recalled to set the appropriate seat position.

DESCRIPTION

When the power seat control switch is operated, a command signal is sent to the position control ECU and switch assembly (power seat control switch and ECU). The front power seat switch then controls the appropriate seat motor as needed. This memory system does not use a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The position control ECU and switch assembly (power seat control switch and ECU) is designed so that any malfunction of the seat memory system will not interfere with manual seat control.

If the position control ECU and switch assembly (power seat control switch and ECU) detects a low motor speed, abnormal activity, or sudden motor current fluctuation, the system will stop the motor. If the motor operates continuously for 120 seconds or more, the system will stop the motor until the switch is turned on again.

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1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the ignition switch on. Perform the ACTIVE TEST by following the directions on the tester screen. D_SEAT (Position control ECU and switch assembly) TEST DETAILS Item Test Details Diagnostic Note RECLINING Test detail: reclining operation FRONT/REAR Vehicle condition: stopped - F VERTICAL Test detail: front vertical operation UP/DOWN Vehicle condition: stopped - LIFTER Test detail: lifter operation UP/DOWN Vehicle condition: stopped - SLIDE Test detail: sliding operation UP/DOWN Vehicle condition: stopped - OK: Each power seat motor operates. NG: GO TO step 2 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) Inspect the power seat motor (See «FRONT SEAT FRAME WITH ADJUSTER» ). OK: The power seat motor operates. NG: REPLACE FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR) Disconnect the position control ECU and switch assembly connector and power seat motor connectors. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P33-2 (SLD+) - P38-1 Always Below 1 ohms P33-3 (SLD-) - P38-2 Always Below 1 ohms P33-4 (FRV-) - P34-2 Always Below 1 ohms P33-6 (FRV+) - P34-1 Always Below 1 ohms P33-7 (LFT+) - P35-2 Always Below 1 ohms P33-9 (LFT-) - P35-1 Always Below 1 ohms P33-8 (RCL+) - P37-2 Always Below 1 ohms P33-10 (RCL-) - P37-1 Always Below 1 ohms P33-2 (SLD+) - Body ground Always 10 kohms or higher P33-3 (SLD-) - Body ground Always 10 kohms or higher P33-4 (FRV-) - Body ground Always 10 kohms or higher P33-6 (FRV+) - Body ground Always 10 kohms or higher P33-7 (LFT+) - Body ground Always 10 kohms or higher P33-9 (LFT-) - Body ground Always 10 kohms or higher P33-8 (RCL+) - Body ground Always 10 kohms or higher P33-10 (RCL-) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The seat memory switch sends signals to the power window regulator switch assembly (power window master switch) via the multiplex communication system to memorize a given seat position. This memory system does not use a position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The seat memory switch is later used to send signals to the front power seat switch to return the seat to one of the memorized positions.

The power seat memory operation can be performed only when the ignition switch is on and the shift lever is in the P position.

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1. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the ignition switch on. Read the DATA LIST. D_SEAT (Position control ECU and switch assembly) MEASUREMENT ITEM/RANGE CHART Item Measurement Item/Range (Display) Normal Condition Diagnostic Note M2 SW Seat memory M2 switch signal/ ON or OFF ON: Seat memory M2 switch is ON OFF: Seat memory M2 switch is OFF - M1 SW Seat memory M1 switch signal/ ON or OFF ON: Seat memory M1 switch is ON OFF: Seat memory M1 switch is OFF - SET SW Seat memory set switch signal/ ON or OFF ON: Seat memory set switch is ON OFF: Seat memory set switch is OFF - OK: Condition status can be displayed. NG: GO TO step 2 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT SEAT MEMORY SWITCH (DRIVING POSITION MEMORY SWITCH) Remove the seat memory switch. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Switch Position Specified Condition 1(E) - 2(MMRY) SET switch ON (pushed) Below 1 ohms 1(E) - 2(MMRY) SET switch OFF (not pushed) 10 kohms or higher 1(E) - 4(1) SW1 switch ON (pushed) Below 1 ohms 1(E) - 4(1) SW1 switch OFF (not pushed) 10 kohms or higher 1(E) - 3(2) SW2 switch ON (pushed) Below 1 ohms 1(E) - 3(2) SW2 switch OFF (not pushed) 10 kohms or higher NG: REPLACE SEAT MEMORY SWITCH (DRIVING POSITION MEMORY SWITCH) OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH CIRCUIT) Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Switch Position Specified Condition D15-2(MMRY) - D15-1(E) Ignition switch on 10 to 14 V D15-3(2) - D15-1 (E) Ignition switch on 10 to 14 V D15-4(1) - D15-1 (E) Ignition switch on 10 to 14 V NG: GO TO step 4 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
4. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR SWITCH ASSEMBLY - SEAT MEMORY SWITCH) Disconnect the power window regulator switch assembly connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Switch Position Specified Condition D15-1(E) - Body ground Always Below 1 ohms D15-2(MMRY) - P22-3(MM) Always Below 1 ohms D15-3(2) - P22-17(M2) Always Below 1 ohms D15-4(1) - P22-13(M1) Always Below 1 ohms D15-2(MMRY) - Body ground Always 10 kohms or higher D15-3(2) - Body ground Always 10 kohms or higher D15-4(1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE POWER WINDOW REGULATOR SWITCH ASSEMBLY (POWER WINDOW MASTER SWITCH)

The position control ECU and switch assembly (power seat control switch and ECU) is contained in the switch assembly.

During manual operation, only one switch signal is accepted. If signals are input from 2 or more switches simultaneously, all of them are ignored, except when signals are input from the front vertical switch and lifter switch simultaneously. In this case, the signal from the lifter will operate.

During automatic operation, a manual switch input will override any other operations, i.e. automatic operations will stop and the manual input operation only will be accepted. For example, if a manual switch input is activated during a seat store/restore operation, the previous operation will cease and manual operation will be performed. After the manual operation is performed, the previous automatic operation will not resume.

The power mirror store/restore operation is unaffected by manual switch inputs.

The front power seat switch does not allow the restore operation of the power seat when the system detects that the voltage of terminal SYSB is less than 8.0 +- 0.5 V for 30 msec. or is more than 10 +- 0.5 V for 30 msec.

This circuit is the power source circuit for the position control ECU and switch assembly (power seat control switch and ECU).

HINT

1. Manual adjustment of the slide, reclining, or lumbar can be performed even when the front power seat switch is not functional if current is allowed to flow into terminals +B and SYSB. Lumbar support operation can be performed at all times.

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1. INSPECT POSITION CONTROL ECU AND SWITCH ASSEMBLY (POWER SEAT CONTROL SWITCH AND ECU POWER SOURCE CIRCUIT) Disconnect the position control ECU and switch assembly connectors. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P33-5(+B) - Body ground Always 10 to 14 V P32-4(IG) - Body ground Ignition switch on 10 to 14 V P32-8(SYSB) - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) OK: Go to next step
2. INSPECT POSITION CONTROL ECU AND SWITCH ASSEMBLY (POWER SEAT CONTROL SWITCH AND ECU GROUND CIRCUIT) Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P33-1(GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

1. GENERAL DESCRIPTION By operating the seat heater switch, which is located in the instrument panel, the temperature can be controlled within the range of 30 to 40°C (86 to 104°F). The seat heater switch indicator light provides seat heater on/off status. The seat heaters of both seats are controlled by the seat heaters. Which are located under the respective seat.

See also:
• AIRBAG SYSTEM