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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 Driver Side >> Inspection Procedure

Inspection Procedure

  1. CHECK FUSE (RR-IG1-3, D S/HTR, D-IG1-3) 
    1. Remove the RR-IG1-3 fuse from the luggage room junction block.
    2. Remove the D S/HTR and D-IG1-3 fuses from the main body ECU.
    3. Measure the resistance of the fuses.

      Standard resistance 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connector Condition Specified Condition
      RR-IG1-3 fuse Always Below 1 Ω
      D S/HTR fuse Always Below 1 Ω
      D-IG1-3 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 e34 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
      e34-12 (GND) - Body ground Always Below 1 Ω
    3. Measure the voltage of the wire harness side connector.
      Fig 1: Identifying e34 ECU Connector Terminals
      G04952662Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connector Switch Condition Specified Condition
      e34-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      e34-2 (SYSB) - Body ground Always 11 to 14 V

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE SWITCH LH - BATTERY AND BODY GROUND) 
    1. Disconnect the L67 switch 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
      L67-2 (E) - Body ground Always Below 1 Ω
    3. Measure the voltage of the wire harness side connector.
      Fig 2: Identifying L67 Switch Connector Terminals
      G04952663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connector Switch Condition Specified Condition
      L67-7 (IG) - Body ground Engine switch on (IG) 11 to 14 V

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step 

  4. INSPECT CLIMATE CONTROL SWITCH LH 
    1. Remove the L67 switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connector Switch Condition Specified Condition
      5 (V5L) - 4 (VSL) Cooler MAX → Heater MAX Below 1 Ω → 5 kΩ
      Fig 3: Identifying Climate Control Switch LH Connector Terminals
      G04952664Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE CLIMATE CONTROL SWITCH LH (See  REMOVAL   ) 

      OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE SWITCH LH AND BODY GROUND) 
    1. Disconnect the e34 ECU connector.
    2. Disconnect the L67 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
      e34-14 (V5) - L67-5 (V5L) Always Below 1 Ω
      e34-18 (VS) - L67-4 (VSL) Always Below 1 Ω
      e34-15 (VG) - L67-3 (VGL) Always Below 1 Ω
      e34-14 (VS) - Body ground Always 10 kΩ or higher
      e34-18 (VS) - Body ground Always 10 kΩ or higher
      e34-15 (VG) - Body ground Always 10 kΩ or higher
      Fig 4: Checking Harness And Connector (Seat Climate Control ECU - Seat Climate Switch LH And Body Ground)
      G04952665Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE SEAT CLIMATE CONTROL ECU (See  DISASSEMBLY   ) 

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