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Home >> Lexus >> 2009 >> LS 460 AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seat >> Climate Control Seat System >> Climate Control System does not Operate on Rear Right Side >> Inspection Procedure

Inspection Procedure

  1. CHECK FUSE (P-IG1-4, P RR S/HTR) 
    1. Remove the P-IG1 -4 and P RR S/HTR fuses from the passenger side junction block.
    2. Measure the resistance of the fuses.

      Standard resistance 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connector Condition Specified Condition
      P-IG1-4 fuse Always Below 1 Ω
      P RR S/HTR fuse Always Below 1 Ω

      NG: REPLACE FUSE 

      OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the f8 ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connector Condition Specified Condition
      f8-12 (GND) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.
      Fig 1: Identifying F8 ECU Connector Terminals
      G06194389Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connector Condition Specified Condition
      f8-2 (SYSB) - Body ground Always 11 to 14 V
      f8-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step 

  3. READ VALUE USING TECHSTREAM (REAR POWER SEAT MODULE SWITCH) 
    1. Check the Data List for proper functioning of the power seat module switch.

      Rear Console Switch 

      DIAGNOSTIC NOTE

      Item Measurement Item/Range Normal Condition Diagnostic Note
      RR Seat A/C Main Switch Rear right seat A/C main switch condition/ON or OFF ON: Switch ON
      OFF: Switch OFF      		 -

      OK: 

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

      Result 

      RESULT CHART

      Result Proceed to
      OK A
      NG (w/ Ottoman) B
      NG (w/o Ottoman) C

      A: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

      B: REPLACE REAR POWER SEAT MODULE SWITCH (See  DISASSEMBLY   ) 

      C: Go to next step 

  4. INSPECT CURTAIN SWITCH ASSEMBLY 
    1. Remove the r3 switch connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connector Switch Condition Specified Condition
      13 (SW3) - 5 (SWE1) Rear right seat A/C switch ON Below 1.5 V

      HINT:

      As the circuit has a diode, perform the measurement with the tester in diode mode.

      Fig 2: Identifying Curtain Switch Assembly Connector Terminals
      G04952681Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE CURTAIN SWITCH ASSEMBLY (See  DISASSEMBLY   ) 

      OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT MODULE SWITCH - CURTAIN SWITCH AND BODY GROUND) 
    1. Disconnect the r1 power seat switch connector.
    2. Disconnect the r3 curtain switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connector Condition Specified Condition
      r1-3 (SW3) - r3-13 (SW3) Always Below 1 Ω
      r1-17 (SWE1) - r3-5 (SWE1) Always Below 1 Ω
      r1-3 (SW3) - Body ground Always 10 kΩ or higher
      r1-17 (SWE1) - Body ground Always 10 kΩ or higher
      Fig 3: Checking Harness And Connector (Rear Power Seat Module Switch - Curtain Switch And Body Ground)
      G06194391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE REAR POWER SEAT MODULE SWITCH (See  DISASSEMBLY   ) 

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