FixVault
Home › Lexus › 2007 › RX 400h AWD › Repair and Diagnosis › Accessories & Equipment › Headlights › Lighting › Lighting System › AFS ECU Power Source Circuit › Inspection Procedure

Inspection Procedure

  1. INSPECT FUSE 
    1. Inspect the ECU-IG No.2 fuse and AM1 fuse in the instrument panel junction block assembly.

      Resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to next step 

  2. INSPECT RELAY 
    1. Remove the IG1 relay from the instrument panel J/B assembly.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 1: Inspecting IG1 Relay
    G04966287Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Resistance 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified resistance
    3 - 5 Always 10 kΩ or higher
    3 - 5 Apply B+ between the terminal 1 and 2 Below 1 Ω

    NG: REPLACE RELAY 

    OK: Go to next step 

  3. INSPECT AFS ECU 
    1. Measure the voltage according to the value(s) in the table below.
    Fig 2: Inspecting AFS ECU
    G05273886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Voltage 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    A14-2 (IG) - A14-1 (E1) Ignition switch OFF → ON Below 1 V → 10 to 14 V
    A14-12 (IGS) - A14-1 (E1) Ignition switch OFF → ON Below 1 V → 10 to 14 V

    NG: GO TO step   4 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  4. CHECK HARNESS AND CONNECTOR (AFS ECU - BODY GROUND) 
    1. Disconnect the A14 connector from headlight swivel ECU assembly.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 3: Disconnecting A14 Connector From Headlight Swivel ECU Assembly
    G05273887Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Resistance 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    A14-1 (E1) - Body ground Always Below 1 Ω
    A14-11 (E1S) - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. INSPECT INSTRUMENT PANEL J/B ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.
    Fig 4: Identifying Instrument Panel Junction Block Assembly Connector Terminals (Front Side)
    G05273779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Voltage 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    1F-19- Body ground Ignition switch OFF → ON Below 1 V → 10 to 14 V

    NG: GO TO step   6 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - AFS ECU) 

  6. INSPECT INSTRUMENT PANEL J/B ASSEMBLY (POWER SOURCE CIRCUIT) 
    1. Measure the voltage according to the value(s) in the table below.
    Fig 5: Identifying Instrument Panel Junction Block Assembly Connector Terminals
    G05273777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Voltage 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    1A-1 - Body ground Always 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL J/B ASSEMBLY) 

    OK: Go to next step 

  7. INSPECT IGNITION SWITCH 
    1. Disconnect the ignition switch connector.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 6: Identifying Ignition Switch Connector Terminals
    G05273780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Resistance 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    2 - 4 Ignition switch OFF 10 kΩ or higher
    2 - 4 Ignition switch ON Below 1 Ω

    NG: REPLACE IGNITION SWITCH 

    OK: Go to next step 

  8. INSPECT INSTRUMENT PANEL J/B ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.
    Fig 7: Identifying Instrument Panel Junction Block Assembly Back Side Connector Terminals
    G05273776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Voltage 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    1I-4 - Body ground Always 10 to 14 V

    NG: REPLACE INSTRUMENT PANEL J/B ASSEMBLY 

    OK: Go to next step 

  9. INSPECT INSTRUMENT PANEL J/B ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.
    Fig 8: Identifying Instrument Panel Junction Block Assembly Back Side Connector Terminals
    G05273776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Voltage 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    1I-9 - Body ground Ignition switch OFF → ON Below 1 V → 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - BODY GROUND) 
    1. Disconnect the 1F connector from the instrument panel junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 9: Identifying Instrument Panel Junction Block Assembly Connector Terminals (Front Side)
    G05273779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Resistance 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    1F-10 - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE INSTRUMENT PANEL J/B ASSEMBLY 

About FixVault