LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> LS 600hL >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Starting >> Smart Access System With Push-Button Start >> DTC B2273 Ignition 2 Monitor Malfunction >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

  1. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (IG2 RELAY MONITOR (INSIDE)) 
    1. Use the Data List to check if the ignition relay No. 2 (IG2) is functioning properly.
      1. Intelligent tester

        MAIN BODY 

        DATA LIST - MAIN BODY

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        IG2 RELAY MON2 Ignition relay No 2 (IG2) inner relay monitor/ON or OFF ON: Power switch ON (IG)
        OFF: Power switch OFF
        -
      2. Techstream

        Main Body 

        DATA LIST - MAIN BODY

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        IG2 Relay Monitor (Inside) Ignition relay No 2 (IG2) inner relay monitor/ON or OFF ON: Power switch ON (IG)
        OFF: Power switch OFF
        -

        OK: When the power switch is turned ON (IG), ON is displayed on the tester. 

    NG:  Go to step  3

    OK: Go to next Step 

  2. CHECK POWER SWITCH (SWITCH CONDITION) 
    1. Ensure the key is inside the cabin
    2. With the brake pedal released, check that the power source mode changes as shown below each time the power switch is pushed.

      OK: OFF → ON (ACC) → ON (IG) → OFF 

    NG: Go to SMART ACCESS SYSTEM WITH PUSH-BUTTON START  , (See POWER SOURCE MODE DOES NOT CHANGE  )

    OK: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

  3. INSPECT IGNITION RELAY NO. 2 (IG2) 
    1. Remove the ignition relay No. 2 (IG2) from the engine room No 2 junction block
    2. Measure the resistance according to the value (s) in the table below

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 Ω
      3 - 5 When battery voltage is not applied to terminals land 2 10 kΩ or higher

    NG: REPLACE RELAY  (See IGNITION RELAY NO. 2 )

    Fig 1: Identifying Ignition Relay No. 2 (IG2)
    G05780666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next Step 

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - IGNITION RELAY NO. 2 (IG2), BODY GROUND) 
    Fig 2: Identifying L12 Main Body ECU Connector & Ignition Relay No.2 IG2
    G05780667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L12 main body ECU connector
    2. Remove the ignition relay No 2 (IG2) from the engine room No 2 junction block.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      L12-11 (IG2D) - Ignition relay No. 2 (IG2) relay terminal 1 Always Below 1 Ω
      Ignition relay No. 2 (IG2) relay terminal 2 -Body ground Always Below 1 Ω
      L12-11 (IG2D) or ignition relay No. 2 (IG2) relay terminal 1 -Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU