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Home >> Lexus >> 2005 >> LS 430 >> Repair and Diagnosis >> Body & Frame >> Seats >> Climate Control Seat System - Diagnostics >> Climate Control System Does Not Operate On Driver Side >> Inspection Procedure
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Inspection Procedure

  1. INSPECT FUSE (D S/HTR) 
    1. Remove the D S/HTR fuse from the driver side J/B.
    2. Measure the resistance of the fuse.

    Standard: Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU) - BATTERY) 
    1. Disconnect the C20 blower connector.
    2. Measure the voltage of the wire harness side connector.

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    C20-7 (IG) - Body ground Ignition switch ON 10 to 14 V
    Fig 1: Identifying Seat Climate Control Blower Connector Terminals
    G03001156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step   4 

    OK: Go to next step 

  3. CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU) - BODY GROUND) 
    1. Disconnect the C20 blower connector.
    2. Measure the resistance of the wire harness side connector.

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    C20-8 (E) - Body ground Below 1 Ω
    Fig 2: Identifying Seat Climate Control Blower Connector Terminals
    G03001157Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU) 

  4. CHECK WIRE HARNESS (DRIVER SIDE J/B - BATTERY) 
    1. Disconnect the DJ J/B connector.
    2. Measure the voltage of the J/B connector.

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    DJ-6 - Body ground Ignition switch ON 10 to 14 V
    Fig 3: Identifying Driver Side J/B Connector Terminals
    G03001158Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step 5 

    OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (DRIVER SIDE J/B - CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU)) 

  5. CHECK WIRE HARNESS (DRIVER SIDE J/B - BATTERY) 
    1. Disconnect the DA and DF J/B connectors.
    2. Measure the voltage of the wire harness side connectors.

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    DA-1 - Body ground Always 10 to 14 V
    DF-4 - Body ground Ignition switch ON 10 to 14 V
    Fig 4: Identifying DA And DF Driver Side J/B Connector Terminals
    G03001159Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  6. CHECK WIRE HARNESS (DRIVER SIDE J/B - BODY GROUND) 
    1. Disconnect the DG J/B connector.
    2. Measure the resistance of the wire harness side connector.

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    DG-8 - Body ground Below 1 Ω
    Fig 5: Identifying DG Driver Side J/B Connector Terminals
    G03001160Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  7. INSPECT RELAY (Marking: D-IG1) 
    1. Remove the D-IG1 relay from the driver side J/B.
    2. Measure the resistance of the relay.

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    3 - 5 10 kΩ or higher
    3 - 5 Below 1 Ω (when battery voltage is applied to terminal 1 and 2)
    Fig 6: Identifying D-IG1 Relay Terminals And Circuit
    G03001161Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE RELAY 

    OK: REPLACE PASSENGER SIDE JUNCTION BLOCK 

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