2013 Lexus LS 460L AWDFACTORY OEM SERVICE PROCEDURE

Climate Control System does not Operate on Driver Side: Procedure

  1. CONFIRM PROBLEM SYMPTOMS 
    RESULT

    Result Proceed to
    Air conditioner and heater do not operate A
    Heater is normal and air conditioner does not operate B
    Air conditioner is normal and heater does not operate C

    B → See step   5 

    C → See step   15 

    A: Go to next step 

  2. CHECK SEAT CLIMATE CONTROL ECU 
    1. Measure the voltage according to the value(s) in the table below.
      GTY397844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      e34-18 (VSL) - Body ground Climate Control Switch
      COLD HI to HOT HI      		 Below 1 V to 5 V

    NG → See step   3 

    OK → See step   24 

  3. INSPECT CLIMATE CONTROL SWITCH LH 
    1. Disconnect the climate control switch, Refer to REMOVAL [09/2012 - ] .
      GTY412669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Switch Condition Specified Condition
      5 (V5L) - 4 (VSL) HOT HI to COLD HI Below 1 Ω to 5 kΩ

    NG → See step   21 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - CLIMATE CONTROL SWITCH) 
    1. Disconnect the e34 ECU connector.
      GTY416412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the L178 climate control switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e34-18 (VSL) - L178-4 (VSL) Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   24 

  5. CHECK SEAT CLIMATE CONTROL ECU 
    1. Measure the voltage according to the value(s) in the table below.
      GTY397844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      e34-18 (VSL) - Body ground Climate Control Switch
      COLD HI to HOT HI      		 Below 1 V to 5 V

    NG → See step   7 

    OK: Go to next step 

  6. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Select the Active Test, use the Techstream to generate a control command, and then check the climate control seat function.
      FRONT LEFT SEAT A/C

      Tester Display Test Part Control Range
      Cool air Cool air operation OFF / ON

      OK

      Cool air operates normally

    NG → See step   9 

    OK → See step   24 

  7. INSPECT CLIMATE CONTROL SWITCH LH 
    1. Disconnect the climate control switch, Refer to REMOVAL [09/2012 - ] .
      GTY412667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Switch Condition Specified Condition
      5 (V5L) - 4 (VSL) HOT HI to COLD HI Below 1 Ω to 5 kΩ
      5 (V5L) - 3 (VGL) Always 5 kΩ

    NG → See step   21 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - CLIMATE CONTROL SWITCH) 
    1. Disconnect the e34 ECU connector.
      GTY397604Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the L178 climate control switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e34-15 (VGL) - L178-3 (VGL) Always Below 1 Ω
      e34-14 (V5L) - e34-18 (VSL) Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   24 

  9. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Select the Active Test, use the Techstream to generate a control command, and then check the blower motor function.
      FRONT LEFT SEAT A/C

      Tester Display Test Part Control Range
      Airflow Airflow operation OFF / Low / High

      OK

      Blower motor operates normally

    NG → See step   11 

    OK: Go to next step 

  10. CHECK SEAT CLIMATE CONTROL CONTROLLER LH (for SEAT CUSHION) 
    1. Replace the seat climate control controller (for Seat Cushion), Refer to DISASSEMBLY [09/2012 - ] .
    2. Check if the climate control seat function is normal.

      OK

      Climate control seat function is normal

    NG → See step   12 

    OK → END (SEAT CLIMATE CONTROL CONTROLLER LH [for SEAT CUSHION] WAS DEFECTIVE) 

  11. CHECK SEAT CLIMATE CONTROL ECU 
    1. Disconnect the e32 climate control blower connector.
      GTY123330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      e32-2 (BFC+) - e32-4 (BFC-) Engine switch off → on (IG) Below 1 V → 11 to 14 V

    NG → See step   13 

    OK → See step   22 

  12. CHECK SEAT CLIMATE CONTROL CONTROLLER LH (for SEATBACK) 
    1. Replace the seat climate control controller (for Seatback), Refer to DISASSEMBLY [09/2012 - ] .
    2. Check if the climate control seat function is normal.

      OK

      Climate control seat function is normal

    NG → See step   14 

    OK → END (SEAT CLIMATE CONTROL CONTROLLER LH [for SEATBACK] WAS DEFECTIVE) 

  13. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL BLOWER LH) 
    1. Disconnect the e34 ECU connector.
      GTY394341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e32 climate control blower connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e34-4 (BFC+) - e32-2 (BFC+) Always Below 1 Ω
      e34-6 (BFC-) - e32-4 (BFC-) Always Below 1 Ω
      e34-5 (BCS) - e32-3 (BCS) Always Below 1 Ω
      e34-4 (BFC+) - Body ground Always 10 kΩ or higher
      e34-6 (BFC-) - Body ground Always 10 kΩ or higher
      e34-5 (BCS) - Body ground Always 10 kΩ or higher
      e34-4 (BFC+) - e34-6 (BFC-) Always 10 kΩ or higher
      e34-5 (BCS) - e34-4 (BFC+) Always 10 kΩ or higher
      e34-5 (BCS) - e34-6 (BFC-) Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   24 

  14. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER LH) 
    1. Disconnect the e34 ECU connector.
      GTY395170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e33 and e51 climate control controller connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e34-8 (TDC+) - e33-1 (TDC+) Always Below 1 Ω
      e34-7 (TDC-) - e51-2 (TDB-) Always Below 1 Ω
      e33-2 (TDC-) - e51-1 (TDB+) Always Below 1 Ω
      e34-8 (TDC+) - Body ground Always 10 kΩ or higher
      e34-7 (TDC-) - Body ground Always 10 kΩ or higher
      e33-2 (TDC-) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   24 

  15. CHECK SEAT CLIMATE CONTROL ECU 
    1. Measure the voltage according to the value(s) in the table below.
      GTY416464Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      e34-18 (VSL) - Body ground Climate Control Switch
      COLD HI to HOT HI      		 Below 1 V to 5 V

    NG → See step   16 

    OK → See step   24 

  16. INSPECT CLIMATE CONTROL SWITCH LH 
    1. Disconnect the climate control switch, Refer to REMOVAL [09/2012 - ] .
      GTY412671Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Switch Condition Specified Condition
      5 (V5L) - 4 (VSL) HOT HI to COLD HI Below 1 Ω to 5 kΩ

    NG → See step   21 

    OK: Go to next step 

  17. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - CLIMATE CONTROL SWITCH) 
    1. Disconnect the e34 ECU connector.
      GTY397599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the L178 climate control switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e34-14 (V5L) - L178-5 (V5L) Always Below 1 Ω
      e34-18 (VSL) - L178-4 (VSL) Always Below 1 Ω
      e34-15 (VGL) - L178-3 (VGL) Always Below 1 Ω
      e34-14 (V5L) - Body ground Always 10 kΩ or higher
      e34-18 (VSL) - Body ground Always 10 kΩ or higher
      e34-15 (VGL) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  18. INSPECT FRONT SEAT CUSHION COVER LH 
    1. Remove the front seat cushion cover LH, Refer to REMOVAL [09/2012 - ] .
    2. Inspect the front seat cushion cover LH, Refer to INSPECTION [09/2012 - ] .

    NG → See step   25 

    OK: Go to next step 

  19. INSPECT FRONT SEATBACK COVER LH 
    1. Remove the front seatback cover LH, Refer to REMOVAL [09/2012 - ] .
    2. Inspect the front seatback cover LH, Refer to INSPECTION [09/2012 - ] .

    NG → See step   23 

    OK: Go to next step 

  20. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - FRONT SEAT CUSHION COVER LH AND BODY GROUND) 
    1. Disconnect the e73 ECU connector.
      GTY408886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the e74 cushion cover connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      e73-1 (AMP) - e74-4 (SWL) Always Below 1 Ω
      e73-1 (AMP) - Body ground Always 10 kΩ or higher
      e74-3 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   24 

  21. REPLACE CLIMATE CONTROL SWITCH LH. Refer to  REMOVAL [09/2012 - ] 
  22. REPLACE SEAT CLIMATE CONTROL BLOWER LH. Refer to  DISASSEMBLY [09/2012 - ] 
  23. REPLACE FRONT SEATBACK COVER LH. Refer to  REMOVAL [09/2012 - ] 
  24. REPLACE SEAT CLIMATE CONTROL ECU. Refer to  DISASSEMBLY [09/2012 - ] 
  25. REPLACE FRONT SEAT CUSHION COVER LH. Refer to  REMOVAL [09/2012 - ] 
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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