2008 Lexus GS 460FACTORY OEM SERVICE PROCEDURE

Terminals Of Ecu

  1. CHECK POWER WINDOW ECU (for Driver Side)Β 
    1. Disconnect the M11 ECU connector.
      Fig 1: Identifying M11 ECU Connector
      G05811686Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      VOLTAGE AND RESISTANCE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M11-1 (E) - Body ground BR - Body ground Ground Always Below 1 Ξ©
      M11-2 (B) - M11-1 (E) GR - BR Power supply Always 11 to 14 V

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

    3. Reconnect the M11 ECU connector.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M11-10 (UP1) - M11-1 (E) R - BR Power window UP operation Engine switch on (IG), master switch OFF β†’ UP 11 to 14 V β†’ Below 1 V
      M11-10 (UP1) - M11-1 (E) R - BR Power window UP operation Engine switch on (IG), door glass fully open β†’ power window AUTO UP operation β†’ door glass fully closed 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      M11-7 (DWN1) - M11-1 (E) G - BR Power window DOWN operation Engine switch on (IG), master switch OFF β†’ DOWN 11 to 14 V β†’ Below 1 V
      M11-7 (DWN1) - M11-1 (E) G - BR Power window DOWN operation Engine switch on (IG), door glass fully closed β†’ power window AUTO DOWN operation β†’ door glass fully open 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V

      If the result is not as specified, the power window regulator motor may have a malfunction.

  2. CHECK POWER WINDOW ECU (for Front Passenger Side)Β 
    1. Disconnect the M5 ECU connector.
      Fig 2: Identifying M5 ECU Connector
      G05811687Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M5-1 (E) - Body ground BR - Body ground Ground Always Below 1 Ξ©
      M5-2 (B) - M5-1 (E) O - BR Power supply Always 11 to 14 V

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

    3. Reconnect the M5 ECU connector.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M5-10 (UP1) - M5-1 (E) R - BR Power window UP operation Engine switch on (IG), switch OFF β†’ UP 11 to 14 V β†’ Below 1 V
      M5-10 (UP1) - M5-1 (E) R - BR Power window UP operation Engine switch on (IG), door glass fully open β†’ power window AUTO UP operation β†’ door glass fully closed 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      M5-7 (DWN1) - M5-1 (E) G - BR Power window DOWN operation Engine switch on (IG), switch OFF β†’ DOWN 11 to 14 V β†’ Below 1 V
      M5-7 (DWN1) - M5-1 (E) G - BR Power window DOWN operation Engine switch on (IG), door glass fully closed β†’ power window AUTO DOWN operation β†’ door glass fully open 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V

      If the result is not as specified, the power window regulator motor may have a malfunction.

  3. CHECK POWER WINDOW ECU (for Rear LH Side)Β 
    1. Disconnect the O9 ECU connector.
      Fig 3: Identifying O9 ECU Connector
      G05811688Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      O9-1 (E) - Body ground BR - Body ground Ground Always Below 1 Ξ©
      O9-2 (B) - O9-1 (E) GR - BR Power supply Always 11 to 14 V

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

    3. Reconnect the O9 ECU connector.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      O9-10 (UP1) - O9-1 (E) R - BR Power window UP operation Engine switch on (IG), switch OFF β†’ UP 11 to 14 V β†’ Below 1 V
      O9-10 (UP1) - O9-1 (E) R - BR Power window UP operation Engine switch on (IG), door glass fully open β†’ power window AUTO UP operation β†’ door glass fully closed 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      O9-7 (DWN1) - O9-1 (E) G - BR Power window DOWN operation Engine switch on (IG), switch OFF β†’ DOWN 11 to 14 V β†’ Below 1 V
      O9-7 (DWN1) - O9-1 (E) G - BR Power window DOWN operation Engine switch on (IG), door glass fully closed β†’ power window AUTO DOWN operation β†’ door glass fully open 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V

      If the result is not as specified, the power window regulator motor may have a malfunction.

  4. CHECK POWER WINDOW ECU (for Rear RH Side)Β 
    1. Disconnect the O4 ECU connector.
      Fig 4: Identifying O4 ECU Connector
      G05811689Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      O4-1 (E) - Body ground BR - Body ground Ground Always Below 1 Ξ©
      O4-2 (B) - O4-1 (E) L - BR Power supply Always 11 to 14 V

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

    3. Reconnect the O4 ECU connector.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      O4-10 (UP1) - O4-1 (E) R - BR Power window UP operation Engine switch on (IG), switch OFF β†’ UP 11 to 14 V β†’ Below 1 V
      O4-10 (UP1) - O4-1 (E) R - BR Power window UP operation Engine switch on (IG), door glass fully open β†’ power window AUTO UP operation β†’ door glass fully closed 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      O4-7 (DWN1) - O4-1 (E) G - BR Power window DOWN operation Engine switch on (IG), switch OFF β†’ DOWN 11 to 14 V β†’ Below 1 V
      O4-7 (DWN1) - O4-1 (E) G - BR Power window DOWN operation Engine switch on (IG), door glass fully closed β†’ power window AUTO DOWN operation β†’ door glass fully open 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V

      If the result is not as specified, the power window regulator motor may have a malfunction.

  5. CHECK POWER WINDOW MASTER SWITCHΒ 
    1. Disconnect the Q13 master switch connector.
      Fig 5: Identifying Q13 Master Switch Connector
      G05811690Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage according to the value (s) in the table below.
      VOLTAGE AND RESISTANCE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      Q13-12 (E) - Body ground W-B - Body ground Ground Always Below 1 Ξ©
      Q13-15 (CPUB) - Q13-12 (E) P - W-B Power supply Always 11 to 14 V
      Q13-18 (SIG) - Q13-12 (E) V - W-B Power supply Engine switch off β†’ on (IG) Below 1 V β†’ 11 to 14 V

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

    3. Reconnect the Q13 master switch connector.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      Q13-20 (U) - Q13-12 (E) R - W-B Power window UP operation Engine switch on (IG), switch OFF β†’ UP 11 to 14 V β†’ Below 1 V
      Q13-20 (U) - Q13-12 (E) R - W-B Power window UP operation Engine switch on (IG), door glass fully open β†’ power window AUTO UP operation β†’ door glass fully closed 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      Q13-16 (D) - Q13-12 (E) G - W-B Power window DOWN operation Engine switch on (IG), switch OFF β†’ DOWN 11 to 14 V β†’ Below 1 V
      Q13-16 (D) - Q13-12 (E) G - W-B Power window DOWN operation Engine switch on (IG), door glass fully closed β†’ power window AUTO DOWN operation β†’ door glass fully open 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      Q13-11 (LED) - Q13-12 (E) SB - W-B Indicator light operation 45 seconds after the engine switch off Below 1 V
      Q13-11 (LED) - Q13-12 (E) SB - W-B Indicator light operation Engine switch on (IG), window lock switch is unlocked 11 to 14 V

      If the result is not as specified, the master switch may be malfunctioning.

  6. CHECK POWER WINDOW REGULATOR SWITCH ASSEMBLY (for Front Passenger Side)Β 
    1. Disconnect the Q6 switch connector.
      Fig 6: Identifying Q6 Switch Connector
      G05811691Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.
      RESISTANCE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      Q6-5 (E) - Body ground W-B - Body ground Ground Always Below 1 Ξ©

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

    3. Reconnect the Q6 switch connector.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      Q6-2 (U) - Q6-5 (E) R - W-B Power window UP operation Engine switch on (IG), switch OFF β†’ UP 11 to 14 V β†’ Below 1 V
      Q6-10 (D) - Q6-5 (E) G - W-B Power window DOWN operation Engine switch on (IG), switch OFF β†’ DOWN 11 to 14 V β†’ Below 1 V
      Q6-4 (A) - Q6-5 (E) B - W-B Power window UP operation Engine switch on (IG), door glass fully open β†’ power window AUTO UP operation β†’ door glass fully closed 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      Q6-4 (A) - Q6-5 (E) B - W-B Power window DOWN operation Engine switch on (IG), door glass fully closed β†’ power window AUTO DOWN operation β†’ door glass fully open 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      Q6-8 (LED) - Q6-5 (E) BR - W-B Indicator light operation 45 seconds after the engine switch off Below 1 V
      Q6-8 (LED) - Q6-5 (E) BR - W-B Indicator light operation Engine switch on (IG), window lock switch is unlocked 11 to 14 V

      If the result is not as specified, the switch may be malfunctioning.

  7. CHECK POWER WINDOW REGULATOR SWITCH ASSEMBLY (for Rear LH Side)Β 
    1. Disconnect the S5 switch connector.
      Fig 7: Identifying S5 Switch Connector
      G05811692Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.
      RESISTANCE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      S5-5 (E) - Body ground W-B - Body ground Ground Always Below 1 Ξ©

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

    3. Reconnect the S5 switch connector.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      S5-2 (U) - S5-5 (E) SB - W-B Power window UP operation Engine switch on (IG), switch OFF β†’ UP 11 to 14 V β†’ Below 1 V
      S5-10 (D) - S5-5 (E) G - W-B Power window DOWN operation Engine switch on (IG), switch OFF β†’ DOWN 11 to 14 V β†’ Below 1 V
      S5-4 (A) - S5-5 (E) P - W-B Power window UP operation Engine switch on (IG), door glass fully open β†’ power window AUTO UP operation β†’ door glass fully closed 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      S5-4 (A) - S5-5 (E) P - W-B Power window DOWN operation Engine switch on (IG), door glass fully closed β†’ power window AUTO DOWN operation β†’ door glass fully open 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      S5-8 (LED) - S5-5 (E) W - W-B Indicator light operation 45 seconds after the engine switch off Below 1 V
      S5-8 (LED) - S5-5 (E) W - W-B Indicator light operation Engine switch on (IG), window lock switch is unlocked 11 to 14 V

      If the result is not as specified, the switch may be malfunctioning.

  8. CHECK POWER WINDOW REGULATOR SWITCH ASSEMBLY (for Rear RH Side)Β 
    1. Disconnect the S1 switch connector.
      Fig 8: Identifying S1 Switch Connector
      G05811693Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.
      RESISTANCE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      S1-5 (E) - Body ground W-B - Body ground Ground Always Below 1 Ξ©

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

    3. Reconnect the S1 switch connector.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      S1-2 (U) - S1-5 (E) SB - W-B Power window UP operation Engine switch on (IG), switch OFF β†’ UP 11 to 14 V β†’ Below 1 V
      S1-10 (D) - S1-5 (E) G - W-B Power window DOWN operation Engine switch on (IG), switch OFF β†’ DOWN 11 to 14 V β†’ Below 1 V
      S1-4 (A) - S1-5 (E) B - W-B Power window UP operation Engine switch on (IG), door glass fully open β†’ power window AUTO UP operation β†’ door glass fully closed 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      S1-4 (A) - S1-5 (E) B - W-B Power window DOWN operation Engine switch on (IG), door glass fully closed β†’ power window AUTO DOWN operation β†’ door glass fully open 11 to 14 V β†’ Below 1 V β†’ 11 to 14 V
      S1-8 (LED) - S1-5 (E) BR - W-B Indicator light operation 45 seconds after the engine switch off Below 1 V
      S1-8 (LED) - S1-5 (E) BR - W-B Indicator light operation Engine switch on (IG), window lock switch is unlocked 11 to 14 V

      If the result is not as specified, the switch may be malfunctioning.

  9. CHECK FRONT DOOR ECU (for Driver Side)Β 
    1. Disconnect the M9 and M10 ECU connectors.
      Fig 9: Identifying M9 And M10 ECU Connectors
      G05811694Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage according to the value (s) in the table below.
      RESISTANCE AND VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M9-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ξ©
      M9-3 (SIG) - M9-1 (GND) Y - W-B Ignition power supply Engine switch off β†’ on (IG) Below 1 V β†’ 11 to 14 V
      M9-4 (CPUB) - M9-1 (GND) LG - W-B Power supply Always 11 to 14 V
      M9-6 (BDR) - M9-1 (GND) L - W-B Power supply Always 11 to 14 V

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

    3. Reconnect the M9 and M10 ECU connectors.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M9-2 (PWE) - Body ground BR - Body ground Ground Always Below 1 V
      M9-5 (BDRJ) - M9-1 (GND) GR - W-B +B power output Always 11 to 14 V
      M9-10 (SIGJ) - M9-1 (GND) V - W-B Ignition power supply output Engine switch off β†’ on (IG) Below 1 V β†’ 11 to 14 V

      If the result is not as specified, the ECU may be malfunctioning.

  10. CHECK FRONT DOOR ECU (for Front Passenger Side)Β 
    1. Disconnect the M4 and M3 ECU connectors.
      Fig 10: Identifying M4 And M3 ECU Connectors
      G05811695Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage according to the value (s) in the table below.
      RESISTANCE AND VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M4-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ξ©
      M4-3 (SIG) - M4-1 (GND) L - W-B Ignition power supply Engine switch off β†’ on (IG) Below 1 V β†’ 11 to 14 V
      M4-4 (CPUB) - M4-1 (GND) LG - W-B Power supply Always 11 to 14 V
      M4-6 (BDR) - M4-1 (GND) L - W-B Power supply Always 11 to 14 V

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

    3. Reconnect the M4 and M3 ECU connectors.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M4-2 (PWE) - Body ground BR - Body ground Ground Always Below 1 V
      M4-5 (BDRJ) - M4-1 (GND) O - W-B +B power output Always 11 to 14 V

      If the result is not as specified, the ECU may be malfunctioning.

  11. CHECK FRONT DOOR ECU (for Rear LH Side)Β 
    1. Disconnect the O7 and O8 ECU connectors.
      Fig 11: Identifying O7 And O8 ECU Connectors
      G05811696Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage according to the value (s) in the table below.
      RESISTANCE AND VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      O7-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ξ©
      O7-3 (SIG) - O7-1 (GND) G - W-B Ignition power supply Engine switch off β†’ on (IG) Below 1 V β†’ 11 to 14 V
      O7-4 (CPUB) - O7-1 (GND) BR - W-B Power supply Always 11 to 14 V
      O7-6 (BDR) - O7-1 (GND) L - W-B Power supply Always 11 to 14 V

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

    3. Reconnect the O7 and O8 ECU connectors.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      O7-2 (PWE) - Body ground BR - Body ground Ground Always Below 1 V
      O7-5 (BDRJ) - O7-1 (GND) GR - W-B +B power output Always 11 to 14 V

      If the result is not as specified, the ECU may be malfunctioning.

  12. CHECK FRONT DOOR ECU (for Rear RH Side)Β 
    1. Disconnect the O2 and O3 ECU connectors.
      Fig 12: Identifying O2 And O3 ECU Connectors
      G05811697Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and voltage according to the value (s) in the table below.
      RESISTANCE AND VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      O3-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ξ©
      O3-3 (SIG) - O3-1 (GND) L - W-B Ignition power supply Engine switch off β†’ on (IG) Below 1 V β†’ 11 to 14 V
      O3-4 (CPUB) - O3-1 (GND) G - W-B Power supply Always 11 to 14 V
      O3-6 (BDR) - O3-1 (GND) L - W-B Power supply Always 11 to 14 V

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

    3. Reconnect the O2 and O3 ECU connectors.
    4. Measure the voltage according to the value (s) in the table below.
      VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      O3-2 (PWE) - Body ground BR - Body ground Ground Always Below 1 V
      O3-5 (BDRJ) - O3-1 (GND) L - W-B +B power output Always 11 to 14 V

      If the result is not as specified, the ECU may be malfunctioning.

  13. CHECK BODY ECU (COWL SIDE JUNCTION BLOCK RH)Β 
    1. Disconnect the DK and DA junction block connectors.
    2. Disconnect the U1, K68 and K67 ECU connectors.
      Fig 13: Identifying U1, K68 And K67 ECU Connectors Locations
      G05811698Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage and resistance according to value (s) in the table below.
      RESISTANCE AND VOLTAGE SPECIFICATION CHART

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      DK-5 (BECU) - Body ground G-R - Body ground Battery power supply Always 11 to 14 V
      U1-14 (DCTY) - Body ground R - Body ground Driver side door courtesy light switch input Driver side door is open β†’ close Below 1 U β†’ 10 kΞ© or higher
      K68-23 (PCTY) - Body ground R - Body ground Front passenger side door courtesy light switch input Front passenger side door is open β†’ close Below 1 Ξ© β†’ 10 kΞ© or higher
      U1-16 (RCTY) - Body ground L - Body ground Rear RH side door courtesy light switch input Rear RH side door is open β†’ close Below 1 Ξ© β†’ l0 kΞ© or higher
      DA-11 (LCTY) - Body ground G - Body ground Rear LH side door courtesy light switch input Rear LH side door is open β†’ close Below 1 Ξ© β†’ 10 kΞ© or higher

      If the result is not as specified, the wire harness side may have a malfunction.

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When to See a Mechanic

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

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