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HOMESERVICE MANUALSTOYOTA2013SEQUOIA LIMITED, 5.7L ENG VIN WREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAIR CONDITIONING SYSTEM (DIAGNOSTIC CODES & CIRCUIT TESTS)AIR CONDITIONING SYSTEMCIRCUIT TESTSREAR AIR CONDITIONING CONTROL PANEL CIRCUITPROCEDURE
2013 Toyota Sequoia Limited, 5.7L Eng VIN W

Rear Air Conditioning Control Panel Circuit: Procedure

2013 Toyota Sequoia Limited, 5.7L Eng VIN WSECTION Procedure
  1. INSPECT FUSE (LH-IG) 
    1. Remove the LH-IG fuse from the main body ECU.
      Fig 1: Identifying LH-IG Fuse
      GTY247139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      LH-IG fuse Always Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL - FUSE, BODY GROUND) 
    1. Disconnect the S4 air conditioning control connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      Fig 2: Identifying S4 Air Conditioning Control Connector
      GTY247215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      S4-4 (E) - Body ground Always Below 1 Ω

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      S4-1 (IG) - Body ground Ignition switch ON 11 to 14 V
    3. Reconnect the air conditioning control connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL - AIR CONDITIONING AMPLIFIER) 
    1. Disconnect the S4 air conditioning control connector.
      Fig 3: Identifying S4 Air Conditioning Control And H67 Air Conditioning Amplifier Connectors
      GTY247216Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the H67 air conditioning amplifier connector.
    3. Measure the resistance and voltage according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H67-13 (RLIN) - S4-5 (RLIN) Always Below 1 Ω
      S4-5 (RLIN) - Body ground Always 10 kΩ or higher
    4. Reconnect the air conditioning amplifier connector.
    5. Reconnect the air conditioning control connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. REPLACE AIR CONDITIONING CONTROL 
    1. Replace the air conditioning control with a new or properly functioning one. Refer to REMOVAL .
    2. Operate the rear power seat module to check that it functions properly.

      OK

      Rear air conditioning control panel function operates normally.

    NG → See step   5 

    OK → END 

  5. REPLACE AIR CONDITIONING AMPLIFIER. Refer to  REMOVAL 
RENDER: 1.0x

NO RELATED

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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.