2007 Lexus LS 460LFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

NOTE: While the battery is connected, even if the engine switch is off, the brake control system activates when the brake pedal is depressed or the door courtesy switch turns on. Therefore during servicing of the brake system components, do not operate the brake pedal and open/ close the doors while the battery is connected.
  1. CHECK ABS MOTOR RELAY (ABS MTR1) 

    HINT:

    The ABS motor relay (ABS MTR1) cannot be removed and inspected, as it is an internal relay of the engine room junction block.

    1. Turn the engine switch off.
    2. Connect the intelligent tester or Techstream to the DLC3.
    3. Remove the relay inspection terminal cover of the engine room No. 2 junction block.
      Fig 1: Identifying Terminal Cover
      G04949639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Turn the engine switch on (IG).
    5. Using the intelligent tester or Techstream, perform the Active Test for the ABS motor relay (ABS MTR1) and measure the voltage between the relay inspection terminals of the engine room junction block.

      HINT:

      As the ABS motor relay (ABS MTR1) is a semiconductor relay, there are no operation sounds.

      Fig 2: Identifying Engine Room No.2 Junction Block
      G04949640Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      Terminal 23 or 24 - Body ground Motor relay: ON 11 to 14 V
      Motor relay: OFF 0V
      Terminal 25 or 26 - Body ground - 11 to 14 V

      If the result is not as specified, check the harness wires and connectors and replace them as necessary.

      If the harness wires and connectors are in good condition, replace the engine room junction block assembly.

  2. CHECK ABS MOTOR RELAY (ABS MTR2) 
    1. Remove the ABS motor relay from the No. 3 relay block.
    2. Measure the resistance according to the value (s) in the table below.
      Fig 3: Checking ABS Motor Relay (ABS MTR2)
      G04949647Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

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

      If the result is not as specified, replace the relay.

    3. Install the ABS motor relay.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.