LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2009 >> LS 460 AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seat >> Front Power Seat Control System >> Power Seat Position is not Memorized >> Inspection Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Inspection Procedure

  1. CHECK FRONT POWER SEAT CONTROL FUNCTION 
    1. 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:  GO TO PROBLEM SYMPTOMS TABLE 

      OK: Go to next step 

  2. CHECK SEAT MEMORY SWITCH FUNCTION 
    1. Perform a memory operation correctly. 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.
      • The seat position will not be recorded if a memory switch (M1, M2 or M3) is not pressed within 3 seconds of pressing the SET switch.
      • If a memorizing operation has failed, release all the switches. The seat memory function does not operate unless the switches are released.

      OK: 

      Seat memory switch function operates normally. 

      NG: Go to step 3 

      OK: SYSTEM IS OK 

  3. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH) 
    1. Check the Data List for proper functioning of the seat memory switch.

      Driver Door 

      DIAGNOSTIC NOTE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Seat Memory Set SW Seat memory SET switch signal/ON or OFF ON: Memory SET switch is ON
      OFF: Memory SET switch is OFF      		 -
      Seat Memory Switch 1 Seat memory switch M1 signal/ON or OFF ON: Seat memory switch M1 is ON
      OFF: Seat memory switch M1 is OFF      		 -
      Seat Memory Switch2 Seat memory switch M2 signal/ON or OFF ON: Seat memory switch M2 is ON
      OFF: Seat memory switch M2 is OFF      		 -
      Seat Memory Switch3 Seat memory switch M3 signal/ON or OFF ON: Seat memory switch M3 is ON
      OFF: Seat memory switch M3 is OFF      		 -

      Passenger Door 

      DIAGNOSTIC NOTE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Seat Memory Set SW Seat memory SET switch signal/ON or OFF ON: Memory SET switch is ON
      OFF: Memory SET switch is OFF      		 -
      Seat Memory Switch 1 Seat memory switch M1 signal/ON or OFF ON: Seat memory switch M1 is ON
      OFF: Seat memory switch M1 is OFF      		 -
      Seat Memory Switch2 Seat memory switch M2 signal/ON or OFF ON: Seat memory switch M2 is ON
      OFF: Seat memory switch M2 is OFF      		 -
      Seat Memory Switch3 Seat memory switch M3 signal/ON or OFF ON: Seat memory switch M3 is ON
      OFF: Seat memory switch M3 is OFF      		 -

      OK: 

      On screen, each item changes between ON and OFF according to above chart. 

      Result 

      RESULT CHART

      Result Proceed to
      OK A
      NG (for Driver Side) B
      NG (for Passenger Side) C

      B:  Go to step  5

      C:  Go to step  7

      A: Go to next step 

  4. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH) 
    1. Check the Data List for proper functioning of the seat memory switch.

      Driver Seat 

      DIAGNOSTIC NOTE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      SET Switch Seat memory SET switch signal/ ON or OFF ON: Memory SET switch is ON
      OFF: Memory SET switch is OFF      		 -
      M1 Switch Seat memory switch M1 signal/ ON or OFF ON: Seat memory switch M1 is ON
      OFF: Seat memory switch M1 is OFF      		 -
      M2 Switch Seat memory switch M2 signal/ ON or OFF ON: Seat memory switch M2 is ON
      OFF: Seat memory switch M2 is OFF      		 -
      M3 Switch Seat memory switch M3 signal/ ON or OFF ON: Seat memory switch M3 is ON
      OFF: Seat memory switch M3 is OFF      		 -

      Passenger Seat 

      DIAGNOSTIC NOTE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      SET Switch Seat memory SET switch signal/ ON or OFF ON: Memory SET switch is ON
      OFF: Memory SET switch is OFF      		 -
      M1 Switch Seat memory switch M1 signal/ ON or OFF ON: Seat memory switch M1 is ON
      OFF: Seat memory switch M1 is OFF      		 -
      M2 Switch Seat memory switch M2 signal/ ON or OFF ON: Seat memory switch M2 is ON
      OFF: Seat memory switch M2 is OFF      		 -
      M3 Switch Seat memory switch M3 signal/ ON or OFF ON: Seat memory switch M3 is ON
      OFF: Seat memory switch M3 is OFF      		 -

      Result 

      RESULT CHART

      Result Proceed to
      OK (for Driver Side) A
      OK (for Passenger Side) B
      NG (for Driver Side) C
      NG (for Passenger Side) D

      OK: 

      On screen, each item changes between ON and OFF according to above chart. 

      B: REPLACE FRONT POWER SEAT SWITCH RH (See REMOVAL   ) 

      C: REPLACE FRONT DOOR ECU LH  (See REMOVAL )

      D: REPLACE FRONT DOOR ECU RH  (See REMOVAL )

      A: REPLACE FRONT POWER SEAT SWITCH LH (See  REMOVAL   ) 

  5. INSPECT SEAT MEMORY SWITCH 
    1. Remove the switch.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      P7-4 (1) - P7-7 (E) M1 switch pressed Below 1 Ω
      P7-2 (2) - P7-7 (E) M2 switch pressed Below 1 Ω
      P7-1 (3) - P7-7 (E) M3 switch pressed Below 1 Ω
      P7-5 (MMRY) - P7-7 (E) SET switch pressed Below 1 Ω
      Fig 1: Identifying Seat Memory Switch Connector Terminals
      G04952492Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE SEAT MEMORY SWITCH (See  REMOVAL   ) 

      OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (FRONT DOOR ECU LH - SEAT MEMORY SWITCH) 
    1. Disconnect the P10 ECU connector.
    2. Disconnect the P7 switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      P10-13 (M1) - P7-4 (1) Always Below 1 Ω
      P10-14 (M2) - P7-2 (2) Always Below 1 Ω
      P10-15 (M3) - P7-1 (3) Always Below 1 Ω
      P10-16 (MM) - P7-5 (MMRY) Always Below 1 Ω
      P10-29 (MSWE) - P7-7 (E) Always Below 1 Ω
      P10-13 (M1) - Body ground Always 10 kΩ or higher
      P10-14 (M2) - Body ground Always 10 kΩ or higher
      P10-15 (M3) - Body ground Always 10 kΩ or higher
      P10-16 (MM) - Body ground Always 10 kΩ or higher
      P10-29 (MSWE) - Body ground Always 10 kΩ or higher
      Fig 2: Checking Harness And Connector (Front Door ECU LH - Seat Memory Switch)
      G06194200Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE FRONT POWER SEAT SWITCH LH (See  REMOVAL   ) 

  7. INSPECT SEAT MEMORY SWITCH 
    1. Remove the switch.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      P12-4 (M1) - P12-7 (E) M1 switch pressed Below 1 Ω
      P12-2 (M2) - P12-7 (E) M2 switch pressed Below 1 Ω
      P12-1 (M3) - P12-7 (E) M3 switch pressed Below 1 Ω
      P12-5 (MRY) - P12-7 (E) SET switch pressed Below 1 Ω
      Fig 3: Identifying Seat Memory Switch Connector Terminals
      G06194201Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE SEAT MEMORY SWITCH (See  REMOVAL   ) 

      OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (FRONT DOOR ECU RH - SEAT MEMORY SWITCH) 
    1. Disconnect the P4 ECU connector.
    2. Disconnect the P12 switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      P4-13 (M1) - P12-4 (M1) Always Below 1 Ω
      P4-14 (M2) - P12-2 (M2) Always Below 1 Ω
      P4-15 (M3) - P12-1 (M3) Always Below 1 Ω
      P4-16 (MM) - P12-5 (MRY) Always Below 1 Ω
      P4-29 (MSWE) - P12-7 (E) Always Below 1 Ω
      P4-13 (M1) - Body ground Always 10 kΩ or higher
      P4-14 (M2) - Body ground Always 10 kΩ or higher
      P4-15 (M3) - Body ground Always 10 kΩ or higher
      P4-16 (MM) - Body ground Always 10 kΩ or higher
      P4-29 (MSWE) - Body ground Always 10 kΩ or higher
      Fig 4: Checking Harness And Connector (Front Door ECU RH - Seat Memory Switch)
      G06194202Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE FRONT DOOR ECU RH  (See REMOVAL )

scientia non olet · About LEMON Manuals