Front Power Seat Control System (Diagnostics & Symptom Tests): Overview Lexus GS III рестайлинг

SYSTEM DESCRIPTION

1. FRONT POWER SEAT CONTROL SYSTEM DESCRIPTION The driver seat and front passenger seat are equipped with slide, reclining, lifter, front vertical and lumbar support adjustment functions. The memory system for the front seats is optional. With the memory function, the position control ECU and switch performs the following: 1) controls the slide, reclining, lifter and front vertical motors; 2) memorizes the seat position; and 3) operates the seat restoring operation. The memory call function uses the key ID code of the key to memorize and reproduce the appropriate driving position for each individual who possesses a master key or sub key.
2. FUNCTION OF MAIN COMPONENT The following functions are available. Components Function Power seat motor (slide motor) Receives signal from position control ECU and motor operates to slide seat forward and rearward Power seat motor (reclining motor) Receives signal from position control ECU and motor operates to tilt and recline seat Power seat motor (front vertical motor) Receives signal from position control ECU and motor operates to raise and lower seat cushion front vertically Power seat motor (lifter motor) Receives signal from position control ECU, motor operates, and seat cushion raises and lowers vertically Lumbar support adjuster motor Receives signal from lumbar front power seat switch and motor operates so that lumbar support can be adjusted Front power seat switch (reclining, lifter, slide, front vertical) Based on switches operated, seat adjuster signals are input into position control ECU to adjust seat accordingly Lumbar front power seat switch Based on switches operated, adjusts seat accordingly Seat memory switch LH (for driver side) (SET switch, memory switch) When the M1, M2 or M3 switch is pressed while the SET switch being pressed, or M1, M2 or M3 switch is pressed within 3 seconds after the SET switch is pressed, a signal is input to multiplex network master switch and sent to position control ECU, which records seat position When M1, M2 or M3 switch is pressed, signal is input to multiplex network master switch and sent to position control ECU, which changes seat position to recorded position Seat memory switch RH (for front passenger side) (SET switch, memory switch) When the M1, M2 or M3 switch is pressed while the SET switch being pressed, or M1, M2 or M3 switch is pressed within 3 seconds after the SET switch is pressed, a signal is input to front multiplex network door ECU RH and sent to position control ECU, which records seat position When M1, M2 or M3 switch is pressed, signal is input to multiplex network master switch and sent to position control ECU, which changes seat position to recorded position
3. SYSTEM OPERATION The front power seat adjustment and position memory are shown in the chart below. Seat Adjustment Function Driver Passenger Fore-and-Aft Slide Power and memory Power and memory Reclining Power and memory Power and memory Front Vertical Height Power and memory Power and memory Lifter Power and memory Power and memory Lumbar Support Power Power Headrest Fore-and-Aft Slide-linked Manual For the driver side memory function, the memory switch operation is first transferred from the multiplex network master switch to the position control ECU via the multiplex communication line. For the front passenger side memory function, memory switch operation is first transferred from the front multiplex network door ECU RH to the position control ECU via the multiplex communication line. Then, either the seat position is recorded in memory or a previously recorded seat position is recalled.

DESCRIPTION

Signals of the front power seat switch are monitored by the position control ECU and switch. The position control ECU and switch then activates the driver and front passenger side motors.

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1. INSPECT FUSE (FR P/SEAT LH, FR P/SEAT RH, R/B-B, D/C CUT, MPX-B) Remove the FR P/SEAT LH fuse from the main body ECU LH. Remove the FR P/SEAT RH fuse from the main body ECU RH. Remove the R/B-B fuse from the fuse block. Remove the D/C CUT and MPX-B fuses from the engine room No. 1 relay block. Measure the resistance of the fuses. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
2. CHECK WIRE HARNESS (POSITION CONTROL ECU AND SWITCH ASSEMBLY - BODY GROUND) Disconnect the a6*2, a7*2, b7*1 and b8*1 switch connectors. Measure the voltage and resistance of the wire harness side connectors. Standard voltage for driver side Tester Connection Specified Condition b8-5 (+B) - Body ground 10 to 14 V b7-8 (SYSB) - Body ground 10 to 14 V for front passenger side Tester Connection Specified Condition a6-5 (+B) - Body ground 10 to 14 V a7-8 (SYSB) - Body ground 10 to 14 V Standard resistance for driver side Tester Connection Specified Condition b8-1 (GND) - Body ground Below 1 ohms for front passenger side Tester Connection Specified Condition a6-1 (GND) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

When the power seat control switch is operated, a command signal is sent to the position control ECU. The position control ECU 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 is designed so that a malfunction of the seat memory system will not interfere with manual seat control.

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1. CHECK FRONT POWER SEAT OPERATION Check that each function of the power seat operates normally by using the front power seat switches. RESULT Result Proceed to All front power seat switch operations are malfunctioning except lumbar front power seat switch operation A Only lumbar front seat switch operation is malfunctioning B B --> See step 7 A: Go to next step
2. READ VALUE USING TECHSTREAM (FRONT POWER SEAT SWITCH) Check the DATA LIST for proper functioning of the front power seat switch. POSITION CONTROL ECU AND SWITCH LH, RH Tester Display Measurement Item/Range Normal Condition Diagnostic Note Reclining Rear Reclining switch signal (Rearward) / ON or OFF ON: Reclining switch (Rearward) is ON OFF: Reclining switch (Rearward) is OFF - Reclining Front Reclining switch signal (Forward) / ON or OFF ON: Reclining switch (Forward) is ON OFF: Reclining switch (Forward) is OFF - Front Vertical Down Front vertical switch signal (Downward) / ON or OFF ON: Front vertical switch (Downward) is ON OFF: Front vertical switch (Downward) is OFF - Front Vertical Up Front vertical switch signal (Upward) / ON or OFF ON: Front vertical switch (Upward) is ON OFF: Front vertical switch (Upward) is OFF - Lifter Switch Down Lifter switch signal (Downward) / ON or OFF ON: Lifter switch (Downward) is ON OFF: Lifter switch (Downward) is OFF - Lifter Switch Up Lifter switch signal (Upward) / ON or OFF ON: Lifter switch (Upward) is ON OFF: Lifter switch (Upward) is OFF - Slide Rear Sliding switch signal (Rearward) / ON or OFF ON: Sliding switch (Rearward) is ON OFF: Sliding switch (Rearward) is OFF - Slide Front Sliding switch signal (Forward) / ON or OFF ON: Sliding switch (Forward) is ON OFF: Sliding switch (Forward) is OFF - OK On tester screen, each item changes between ON and OFF according to above chart. NG --> See step 10 OK: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the power seat motors operate. POSITION CONTROL ECU AND SWITCH (FOR DRIVER, FRONT PASSENGER SIDE) Tester Display Test Part Control Range Diagnostic Note Seat Reclining Seat reclining operation FRONT / REAR - Front Vertical Operation Seat front vertical operation UP / DOWN - Lifter Operation Seat lifter operation UP / DOWN - Seat Slide Operation Seat sliding operation FRONT / REAR - OK The power seat motors operate normally. RESULT Result Proceed to NG (Driver side power seat motors do not operate) A NG (Front passenger side power seat motors do not operate) B OK C C --> See step 11 B --> See step 5 A: Go to next step
4. INSPECT FRONT SEAT FRAME WITH ADJUSTER LH [SLIDE MOTOR, FRONT VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR] (for Driver Side) Remove the front seat adjuster LH. Check operation of the slide motor. Check if the seat adjuster moves smoothly when the battery is connected to the slide motor connector terminals. OK Measurement Condition Operation Direction Battery positive (+) --> 1 Battery negative (-) --> 2 Forward Battery positive (+) --> 2 Battery negative (-) --> 1 Rearward Check operation of the front vertical motor. Check if the seat adjuster moves smoothly when the battery is connected to the front vertical motor connector terminals. OK Measurement Condition Operation Direction Battery positive (+) --> 1 Battery negative (-) --> 2 Upward Battery positive (+) --> 2 Battery negative (-) --> 1 Downward Check operation of the lifter motor. Check if the seat adjuster moves smoothly when the battery is connected to the lifter motor connector terminals. OK Measurement Condition Operation Direction Battery positive (+) --> 2 Battery negative (-) --> 1 Upward Battery positive (+) --> 1 Battery negative (-) --> 2 Downward Check operation of the reclining motor. Check if the seat adjuster moves smoothly when the battery is connected to the reclining motor connector terminals. OK Measurement Condition Operation Direction Battery positive (+) --> 2 Battery negative (-) --> 1 Forward Battery positive (+) --> 1 Battery negative (-) --> 2 Rearward OK --> See step 6 NG --> See step 12
5. INSPECT FRONT SEAT FRAME WITH ADJUSTER RH [SLIDE MOTOR, FRONT VERTICAL MOTOR, LIFTER MOTOR, RECLINING MOTOR] (for Front Passenger Side) Remove the front seat adjuster RH. Check operation of the slide motor. Check if the seat adjuster moves smoothly when the battery is connected to the slide motor connector terminals. OK Measurement Condition Operation Direction Battery positive (+) --> 2 Battery negative (-) --> 1 Forward Battery positive (+) --> 1 Battery negative (-) --> 2 Rearward Check operation of the front vertical motor. Check if the seat adjuster moves smoothly when the battery is connected to the front vertical motor connector terminals. OK Measurement Condition Operation Direction Battery positive (+) --> 2 Battery negative (-) --> 1 Upward Battery positive (+) --> 1 Battery negative (-) --> 2 Downward Check operation of the lifter motor. Check if the seat adjuster moves smoothly when the battery is connected to the lifter motor connector terminals. OK Measurement Condition Operation Direction Battery positive (+) --> 1 Battery negative (-) --> 2 Upward Battery positive (+) --> 2 Battery negative (-) --> 1 Downward Check operation of the reclining motor. Check if the seat adjuster moves smoothly when the battery is connected to the reclining motor connector terminals. OK Measurement Condition Operation Direction Battery positive (+) --> 2 Battery negative (-) --> 1 Forward Battery positive (+) --> 1 Battery negative (-) --> 2 Rearward NG --> See step 13 OK: Go to next step
6. CHECK WIRE HARNESS (POSITION CONTROL ECU AND SWITCH - POWER SEAT MOTOR AND BODY GROUND) Disconnect the b8*1 or a6*2 switch connector. Disconnect the b3*1, b4*1, b10*1, b15*1, a1*2, a4*2, a10*2 or a15*2 motor connector. Measure the resistance of the wire harness side connectors. Standard resistance for driver side for front passenger side Tester Connection Specified Condition b8-3 (SLD-) - b3-2 Below 1 ohms b8-2 (SLD+) - b3-1 Below 1 ohms b8-4 (FRV-) - b4-2 Below 1 ohms b8-6 (FRV+) - b4-1 Below 1 ohms b8-9 (LFT-) - b10-1 Below 1 ohms b8-7 (LFT+) - b10-2 Below 1 ohms b8-10 (RCL-) - b15-1 Below 1 ohms b8-8 (RCL+) - b15-2 Below 1 ohms b8-1 (GND) - Body ground Below 1 ohms b8-3 (SLD-) or b3-2 - Body ground 10 kohms or higher b8-2 (SLD+) or b3-1 - Body ground 10 kohms or higher b8-4 (FRV-) or b4-2 - Body ground 10 kohms or higher b8-6 (FRV+) or b4-1 - Body ground 10 kohms or higher b8-9 (LFT-) or b10-1 - Body ground 10 kohms or higher b8-7 (LFT+) or b10-2 - Body ground 10 kohms or higher b8-10 (RCL-) or b15-1 - Body ground 10 kohms or higher b8-8 (RCL+) or b15-2 - Body ground 10 kohms or higher Tester Connection Specified Condition a6-3 (SLD-) - a1-1 Below 1 ohms a6-2 (SLD+) - a1-2 Below 1 ohms a6-4 (FRV-) - a4-1 Below 1 ohms a6-6 (FRV+) - a4-2 Below 1 ohms a6-9 (LFT-) - a10-2 Below 1 ohms a6-7 (LFT+) - a10-1 Below 1 ohms a6-10 (RCL-) - a15-1 Below 1 ohms a6-8 (RCL+) - a15-2 Below 1 ohms a6-1 (GND) - Body ground Below 1 ohms a6-3 (SLD-) or a1-1 - Body ground 10 kohms or higher a6-2 (SLD+) or a1-2 - Body ground 10 kohms or higher a6-4 (FRV-) or a4-1 - Body ground 10 kohms or higher a6-6 (FRV+) or a4-2 - Body ground 10 kohms or higher a6-9 (LFT-) or a10-2 - Body ground 10 kohms or higher a6-7 (LFT+) or a10-1 - Body ground 10 kohms or higher a6-10 (RCL-) or a15-1 - Body ground 10 kohms or higher a6-8 (RCL+) or a15-2 - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 14
7. INSPECT LUMBAR FRONT POWER SEAT SWITCH Remove the switch. Measure the resistance between the terminals when the switch is operated. Standard resistance for driver side for front passenger side Tester Connection Switch Condition Specified Condition 2 (B) - 3 (R) HOLD Below 1 ohms 4 (E2) - 5 (H) HOLD Below 1 ohms 1 (E) - 3 (R) OFF Below 1 ohms 5 (H) - 4 (E2) OFF Below 1 ohms 1 (E) - 3 (R) RELEASE Below 1 ohms 2 (B) - 5 (H) RELEASE Below 1 ohms Tester Connection Switch Condition Specified Condition 1 (GND) - 5 (R) HOLD Below 1 ohms 2 (B) - 3 (H) HOLD Below 1 ohms 1 (GND) - 5 (R) OFF Below 1 ohms 3 (H) - 4 (E) OFF Below 1 ohms 2 (B) - 5 (R) RELEASE Below 1 ohms 3 (H) - 4 (E) RELEASE Below 1 ohms NG --> See step 15 OK: Go to next step
8. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY Remove the lumbar support adjuster. Check operation of the lumbar support adjuster. Check that the lumbar support adjuster moves smoothly when the battery is connected to the lumbar support adjuster motor connector terminals. OK Measurement Condition Operation Direction Battery positive (+) --> 1 Battery negative (-) --> 2 Clockwise Battery positive (+) --> 2 Battery negative (-) --> 1 Counterclockwise NG --> See step 16 OK: Go to next step
9. CHECK WIRE HARNESS (LUMBAR FRONT POWER SEAT SWITCH - BATTERY AND BODY GROUND) Disconnect the b6 or a8 switch connector. Measure the voltage of the wire harness side connector. Standard voltage for driver side for front passenger side Tester Connection Specified Condition b6-2 (B) - Body ground 10 to 14 V Tester Connection Specified Condition a8-2 (B) - Body ground 10 to 14 V Measure the resistance of the wire harness side connectors. Standard resistance for driver side for front passenger side Tester Connection Specified Condition b6-1 (E) - Body ground Below 1 ohms b6-4 (E2) - Body ground Below 1 ohms Tester Connection Specified Condition a8-1 (GND) - Body ground Below 1 ohms a8-4 (E) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (LUMBAR FRONT POWER SEAT SWITCH - LUMBAR SUPPORT ADJUSTER)
10. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-386977-S00395476632011022400000)
11. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-386977-S00395476632011022400000)
12. REPLACE FRONT SEAT ASSEMBLY LH. Refer to «REMOVAL»(ref-386977-S34763901752011022400000)
13. REPLACE FRONT SEAT ASSEMBLY RH. Refer to «REMOVAL»(ref-386977-S34763901752011022400000)
14. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY. Refer to «REMOVAL»(ref-386977-S00395476632011022400000)
15. REPLACE LUMBAR FRONT POWER SEAT SWITCH. Refer to «REMOVAL»(ref-386977-S35553291612011022400000)
16. REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY. Refer to «REMOVAL»(ref-386977-S07481167642011022400000)

The driver side seat memory switch sends signals to the position control ECU LH to memorize a given seat position via the multiplex network master switch. The front passenger side seat memory switch signals the position control ECU RH to memorize a given seat position via the front multiplex network door ECU RH. 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 seat memory switch sends signals to the position control ECU to return to one of the memorized positions.

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1. CHECK FRONT POWER SEAT CONTROL FUNCTION Check that each function of the power seat operates normally by using the front power seat switches. OK Each function of power seat operates normally by using seat switches. NG --> See step 12 OK: Go to next step
2. CHECK SEAT MEMORY SWITCH FUNCTION (SEAT POSITION MEMORY FUNCTION) Perform a memory operation properly. Check that the buzzer sounds to indicate the completion of the memory operation. NOTE: The seat position will not be recorded if the SET switch and 2 or more of the memory switches (for example, M1 and M2) are pressed simultaneously. If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released. OK Seat memory switch function operates normally. RESULT Result Proceed to NG (Driver side seat memory function does not operate) A NG (Front passenger side seat memory function does not operate) B OK C C --> See step 13 B --> See step 9 A: Go to next step
3. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH LH) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / MSW / Data List. Read the Data List according to the display on the Techstream. MSW Tester Display Measurement Item/Range Normal Condition Diagnostic Note Seat Memory Set Switch SET switch signal / ON or OFF ON: SET switch is ON OFF: SET switch is OFF - Seat Memory Switch M1 M1 switch signal / ON or OFF ON: M1 switch is ON OFF: M1 switch is OFF - Seat Memory Switch M2 M2 switch signal / ON or OFF ON: M2 switch is ON OFF: M2 switch is OFF - Seat Memory Switch M3 M3 switch signal / ON or OFF ON: M3 switch is ON OFF: M3 switch is OFF - OK On tester screen, each item changes between ON and OFF according to above chart. NG --> See step 5 OK: Go to next step
4. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH LH) Enter the following menus: Body Electrical / Driver Seat / Data List. Read the Data List according to the display on the Techstream. DRIVER SEAT Tester Display Measurement Item/Range Normal Condition Diagnostic Note M1 Switch M1 switch signal / ON or OFF ON: M1 switch is ON OFF: M1 switch is OFF - M2 Switch M2 switch signal / ON or OFF ON: M2 switch is ON OFF: M2 switch is OFF - M3 Switch M3 switch signal / ON or OFF ON: M3 switch is ON OFF: M3 switch is OFF - SET Switch SET switch signal / ON or OFF ON: SET switch is ON OFF: SET switch is OFF - Slide Position Seat sliding Position / MIN: -4096, MAX: 4096 Within -4096 to 4096 - Reclining Position Seatback Position / MIN: -4096, MAX: 4096 Within -4096 to 4096 - Front Vertical Position Seat front vertical Position / MIN: -4096, MAX: 4096 Within -4096 to 4096 - Lifter Position Seat lifter Position / MIN: -4096, MAX: 4096 Within -4096 to 4096 - Memory No1 Driving position memorized with M1 switch / MEM or NOT MEM MEM: Memorized NOT MEM: Not memorized - Memory No2 Driving position memorized with M2 switch / MEM or NOT MEM MEM: Memorized NOT MEM: Not memorized - Memory No3 Driving position memorized with M3 switch / MEM or NOT MEM MEM: Memorized NOT MEM: Not memorized - Seat Memory No1 Seat position memorized with M1 switch / MEM or NOT MEM MEM: Memorized NOT MEM: Not memorized - Seat Memory No2 Seat position memorized with M2 switch / MEM or NOT MEM MEM: Memorized NOT MEM: Not memorized - Seat Memory No3 Seat position memorized with M3 switch / MEM or NOT MEM MEM: Memorized NOT MEM: Not memorized - Ignition switch Power Switch status (IG) / ON or OFF ON: Power switch on (IG) OFF: Power switch off - OK On tester screen, each item is displayed according to above chart. NG --> See step 14 OK --> See step 15
5. INSPECT SEAT MEMORY SWITCH LH (for Driver Side) Remove the seat memory switch. Refer to «REMOVAL»(ref-386977-S33604841662011022400000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 2 (M1) - 5 (E) M1 switch pressed Below 1 ohms 3 (M2) - 5 (E) M2 switch pressed Below 1 ohms 4 (M3) - 5 (E) M3 switch pressed Below 1 ohms 1 (MRY) - 5 (E) SET switch pressed Below 1 ohms NG --> See step 16 OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - SEAT MEMORY SWITCH LH) Disconnect the Q13 and Q10 switch connectors. Measure the resistance according to the value(s) in the table bellow. Standard Resistance Tester Connection Specified Condition Q13-8 (MM) - Q10-1 (MRY) Below 1 ohms Q13-7 (M1) - Q10-2 (M1) Below 1 ohms Q13-5 (M2) - Q10-3 (M2) Below 1 ohms Q13-14 (M3) - Q10-4 (M3) Below 1 ohms Q13-8 (MM) or Q10-1 (MRY) - Body ground 10 kohms or higher Q13-7 (M1) or Q10-2 (M1) - Body ground 10 kohms or higher Q13-5 (M2) or Q10-3 (M2) - Body ground 10 kohms or higher Q13-14 (M3) or Q10-4 (M3) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH LH - BODY GROUND) Disconnect the Q10 switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Specified Condition Q10-5 (E) - Body ground Below 1 ohms NG --> See step 8 OK --> See step 17
8. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU LH - SEAT MEMORY SWITCH LH) Disconnect the M9 ECU connector. Disconnect the Q10 switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Specified Condition M9-26 (MSWE) - Q10-5 (E) Below 1 ohms M9-1 (GND) - Body ground Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 18
9. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH RH) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / MSW / Data List. Read the Data List according to the display on the Techstream. MSW Tester Display Measurement Item/Display Normal Condition Diagnostic Note M1 Switch M1 switch signal / ON or OFF ON: M1 switch is ON OFF: M1 switch is OFF - M2 Switch M2 switch signal / ON or OFF ON: M2 switch is ON OFF: M2 switch is OFF - M3 Switch M3 switch signal / ON or OFF ON: M3 switch is ON OFF: M3 switch is OFF - SET Switch SET switch signal / ON or OFF ON: SET switch is ON OFF: SET switch is OFF - OK On tester screen, each item is displayed according to above chart. NG --> See step 10 OK --> See step 19
10. INSPECT SEAT MEMORY SWITCH RH (for Front Passenger Side) Remove the seat memory switch. Refer to «REMOVAL»(ref-386977-S33604841662011022400000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 2 (1) - 5 (E) M1 switch pressed Below 1 ohms 3 (2) - 5 (E) M2 switch pressed Below 1 ohms 4 (3) - 5 (E) M3 switch pressed Below 1 ohms 1 (MMRY) - 5 (E) SET switch pressed Below 1 ohms NG --> See step 20 OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU RH - SEAT MEMORY SWITCH RH) Disconnect the M4 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Specified Condition M4-25 (MM) - Q2-1 (MMRY) Below 1 ohms M4-22 (M1) - Q2-2 (1) Below 1 ohms M4-23 (M2) - Q2-3 (2) Below 1 ohms M4-24 (M3) - Q2-4 (3) Below 1 ohms M4-26 (MSWE) - Q2-5 (E) Below 1 ohms M4-1 (GND) - Body ground Below 1 ohms M4-25 (MM) or Q2-1 (MMRY) - Body ground 10 kohms or higher M4-22 (M1) or Q2-2 (1) - Body ground 10 kohms or higher M4-23 (M2) or Q2-3 (2) - Body ground 10 kohms or higher M4-24 (M3) or Q2-4 (3) - Body ground 10 kohms or higher M4-26 (MSWE) or Q2-5 (E) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 21
12. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-386970-S23053229032011022400000)
13. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-386951-S32163540552011022400000)
14. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to «REMOVAL - Step 9»(ref-387104-S13389567862011022400000)
15. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH. Refer to «REMOVAL»(ref-386977-S00395476632011022400000)
16. REPLACE SEAT MEMORY SWITCH LH. Refer to «REMOVAL»(ref-386977-S33604841662011022400000)
17. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY. Refer to «REMOVAL - Step 9»(ref-387104-S13389567862011022400000)
18. REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH. Refer to «REMOVAL - Step 13»(ref-387104-S13389567862011022400000)
19. REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY RH. Refer to «REMOVAL»(ref-386977-S00395476632011022400000)
20. REPLACE SEAT MEMORY SWITCH RH. Refer to «REMOVAL»(ref-386977-S33604841662011022400000)
21. REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH. Refer to «REMOVAL - Step 13»(ref-387104-S13389567862011022400000)

When the driver side M1, M2 or M3 switch is pressed, the multiplex network master switch controls the position control ECU (via the multiplex communication line) to drive each motor until the seat reaches the memorized position. When the front passenger side M1, M2 or M3 switch is pressed, the front multiplex network door ECU RH controls the position control ECU (via the multiplex communication line) to drive each motor until the seat reaches the memorized position.

With the power switch OFF and the driver side door closed, press the M1, M2 or M3 switch and the transmitter's LOCK or UNLOCK switch. The main body ECU RH will receive a key recognition code signal through wireless radio waves, and send the key recognition code signal to the position control ECU and switch via the BEAN line. The position control ECU and switch then organizes the key recognition code received from the memory switch and sounds the buzzer (answer back) when the code is registered.

When the transmitter is used to unlock the doors, the main body ECU RH sends a wireless unlock or entry unlock signal and key recognition code signal to the position control ECU and switch, which records the key recognition code. The position control ECU and switch then memorizes any seat position, memory call operations and memory call commands, and links them to the key recognition code.

When the door is unlocked by the wireless unlock operation

When the driver side door is opened, the position control ECU and switch receives the door courtesy light switch signal from the main body ECU RH. Then the ECU sends the memory call command signals to the appropriate ECU. The ECU that receives the signals then performs the memory call function according to standard control timing*.

When the door is unlocked by the entry unlock operation

When the driver side door is opened, the position control ECU and switch receives the memory call command signal via the BEAN line from the certification ECU. Then the ECU sends the memory call command signals to the appropriate ECU. The ECU that receives the signals then performs the memory call function according to standard control timing*.

HINT

*: Standard control timing refers to the controlled timing of the automatic movement of the seat position, mirror position and tilt and telescopic.