LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 307 (Brake Control System) >> Vehicle Stability Control System >> Diagnosis System
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis System

WARNING: This page is about a different car, the 2008 Toyota FJ Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DLC3 
    1. The ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 15765-4 format.
      Fig 1: Identifying DLC3 Connector Terminals
      G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Terminal Description Condition Specified Condition
      SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
      CG (4) - Body ground Chassis ground Always Below 1 Ω
      SG (5) - Body ground Signal ground Always Below 1 Ω
      BAT (16) - Body ground Battery positive Always 10 to 14 V
      CANH (6) - CANL (14) HIGH-level CAN bus line Ignition switch OFF(1) 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF(1) 200 Ω or more
      CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF(1) 200 Ω or more
      CANH (6) - BAT (16) HIGH-level CAN bus line Ignition switch OFF(1) 6 kΩ or more
      CANL (14) - BAT (16) LOW-level CAN bus line Ignition switch OFF(1) 6 kΩ or more
      (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

      If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

      HINT:

      Connect the cable of the Techstream to the DLC3, turn the ignition switch to ON and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

      • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
      • If communication is still not possible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.
  2. DIAGNOSIS 
    1. If the skid control ECU detects a malfunction, the ABS warning light, VSC TRAC warning light, BRAKE warning light, VSC OFF indicator light and/ or SLIP indicator light come on in accordance with the trouble area to warn the driver.

      The table below indicates which lights come on when there is a malfunction in a particular function.

      Fig 2: Identifying Warning Lights
      G05579792Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      INDICATOR / TROUBLE AREA REFERENCE

      Indicator / Trouble Area ABS EBD BA VSC TRAC AUTO LSD A-TRAC
      ABS Warning Light ◦ ◦ ◦ - - - -
      VSC TRAC Warning Light - - - ◦ ◦ ◦ ◦
      Brake Warning Light - ◦ - - - - -
      VSC OFF Indicator Light - - - ◦ - - -
      Slip Indicator Light - - - - ◦ ◦ ◦
      ◦: Light ON, -: Light OFF

      HINT:

      • The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting the Techstream.
      • This system has a sensor signal check function (See TEST MODE PROCEDURE  ). The DTCs can be read by connecting SST (09843-18040) between terminals TS and CG of the DLC3 and observing the blinking of the ABS warning light and VSC TRAC warning light, or by connecting the Techstream.
  3. WARNING LIGHT AND INDICATOR LIGHT CHECK 
    Fig 3: Identifying Warning Lights And Indicator Lights
    G05579793Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Release the parking brake.
      NOTE: When releasing the parking brake, set chocks to hold the vehicle for safety.

      HINT:

      When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light comes on.

    2. Check that the ABS warning light, VSC TRAC warning light, BRAKE warning light, VSC OFF indicator light, SLIP indicator light and AUTO LSD indicator light come on when the ignition switch is turned to ON, and go off in about 3 seconds.

      HINT:

      If the lights do not illuminate, confirm whether the bulbs have burned out, and also check the wire harness between the skid control ECU and the combination meter.

      If the light remains on, troubleshoot the effected light circuit by proceeding to the page indicated below.

      TROUBLE AREA REFERENCE

      Trouble Area See
      ABS warning light circuit ABS WARNING LIGHT REMAINS ON 
      VSC TRAC warning light circuit VSC TRAC WARNING LIGHT REMAINS ON 
      BRAKE warning light circuit BRAKE WARNING LIGHT REMAINS ON 
      VSC OFF indicator light circuit VSC OFF INDICATOR LIGHT REMAINS ON 
      SLIP indicator light circuit SLIP INDICATOR LIGHT REMAINS ON 
      AUTO LSD indicator light AUTO LSD INDICATOR LIGHT REMAINS ON 
scientia non olet · About LEMON Manuals