2008 Lexus LS 460LFACTORY OEM SERVICE PROCEDURE

Terminals Of Ecu

  1. CHECK FRONT LIGHT ECU (FRONT CONTROLLER) 
    1. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTOR TERMINAL REFERENCE TABLE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      A52-1 (BATB) - A50-2 (E) P-W-B Power source Always 11 to 14 V
      A52-5 (ALTB) - A50-2 (E) L-W-B Power source Always 11 to 14 V
      A50-1 (FMB3) - A50-2 (E) LG - W-B Power source Always 11 to 14 V
      A50-2 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A51-12 (RDEF) - A50-2 (E) W - W-B Defogger relay Engine switch on (IG) Rear defogger switch ON Below 1 V
      Engine switch on (IG) Rear defogger switch OFF 11 to 14 V
      A50-5 (FMIG) - A50-2 (E) Y-W-B Power source Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

      If the result is not as specified, the front light ECU (front controller) or fuse may have a malfunction.

      Fig 1: Identifying Front Light ECU Connector Terminal A51, A50, A52 & B14 (Front Controller)
      G04950356Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK AIR CONDITIONING AMPLIFIER 
    1. Disconnect the L76 and L77 air conditioning amplifier connectors.
      Fig 2: Identifying Air Conditioning Amplifier Connector Terminal Z1, L76 & L77
      G04950350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTOR TERMINAL REFERENCE TABLE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L76-5 (IG+) - L76-1 (GND) V - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      L76-6 (+B1) - L76-1 (GND) L - W-B Battery power source Always 11 to 14 V
      L76-7 (+B2) - L76-1 (GND) L - W-B Battery power source Always 11 to 14 V
      L76-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L76-2 (FGND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L77-6 (RGND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

  3. CHECK MULTI-DISPLAY 
    1. Disconnect the L59 multi-display connector.
      2. Fig 3: Identifying Multi-Display Connector Terminal L59
      G04950361Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTOR TERMINAL REFERENCE TABLE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L59-1 (+B1) - L59-10 (GND1) R - W-B Battery power source Always 11 to 14 V
      L59-3 (IG) - L59-10 (GND1) V - W-B Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      L59-10 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

  4. CHECK INTEGRATION CONTROL AND PANEL (w/o Multi-display) 
    1. Disconnect the L35 integration control and panel connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTOR TERMINAL REFERENCE TABLE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L35-1 (+B1) - L35-10 (GND1) B - W-B Battery power source Always 11 to 14 V
      L35-3 (IG) - L35-10 (GND1) V - W-B Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      L35 -10 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

      Fig 4: Identifying Integration Control & Panel Connector Terminal L35 (w/o Multi-Display)
      G04950362Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.