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Inspection Procedure

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

      Resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to next step 

  2. INSPECT RELAY 
    1. Inspect IG1 relay continuity.
      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 RESISTANCE 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 HEADLIGHT BEAM LEVEL CONTROL ECU 
    1. Disconnect the H17 connector of headlight beam level control ECU.
    2. Measure the voltage according to the value(s) in the table below.
    Fig 2: Disconnecting H17 Connector Of Headlight Beam Level Control ECU
    G05273868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Voltage 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    H17-14 (IG) - H17-1 (GND) Ignition switch OFF → ON Below 1 V → 1o to 14 V

    NG: GO TO step   4 

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

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT BEAM LEVEL CONTROL ECU BODY GROUND) 
    1. Disconnect the H17 connector of headlight beam level control ECU.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 3: Disconnecting H17 Connector Of Headlight Beam Level Control ECU
    G05273869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Resistance 

    TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

    Tester connection Condition Specified condition
    H17-1 (GND) - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (POWER SOURCE CIRCUIT) 
    1. Measure the voltage according to the value(s) in the table below.
    Fig 4: 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 

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.
    Fig 5: 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 1V → 10 to 14 V

    NG: GO TO step   7 

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

  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 

    SYMBOL CONNECTION REFERENCE CHART

    Tester connection Condition Specified resistance
    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 JUNCTION BLOCK 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 JUNCTION BLOCK ASSEMBLY 

    OK: Go to next step 

  9. INSPECT INSTRUMENT PANEL JUNCTION BLOCK 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 JUNCTION BLOCK ASSEMBLY 

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