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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT FUSE (AM2) 
    1. Remove the AM2 fuse from the cowl side J/B RH.
    2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to next step. 

  2. CHECK CONNECTORS 
    1. Check that the connectors are securely connected and the terminals are not deformed or loose.

      OK: 

      The connectors are securely connected and the terminals are not deformed or loose. 

    NG: REPAIR OR REPLACE CONNECTORS 

    OK: Go to next step. 

  3. INSPECT WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-33 (AM1) - Body ground Always 10 to 14 V
      J55-12 (AM2) - Body ground Always 10 to 14 V
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-6 (GND2) - Body ground Always Below 1 Ω
      Fig 1: Identifying J55 Power Source Control ECU Connector
      G05829079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  4. INSPECT COWL SIDE JUNCTION BLOCK RH (ACC RELAY, PWR POINT RELAY) 
    1. Disconnect the cowl side J/B RH connectors.
      Fig 2: Identifying Cowl Side J/B RH Connectors
      G05829184Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      RD-2 - RA-5 or RD-7 Always 68 to 250 Ω at 20°C (68°F)
      RM-1 - RD-27 When battery voltage is applied to terminals RD-2 and RA-5 or RD-7 Below 1 Ω
      RM-1 -RJ-16 When battery voltage is applied to terminals RD-2 and RA-5 or RD-7 Below 1 Ω

    NG:  Go to step  7

    OK: Go to next step. 

  5. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU OR BATTERY - COWL SIDE J/B RH) 
    1. Measure the resistance of the wire harness side connector.
      Fig 3: Identifying J55 Power Source Control ECU And Cowl Side J/B RH Connectors
      G05829174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - RD-2 Always Below 1 Ω
      J55-11 (ACCD) - Body ground Always 10 kΩ or higher
      RA-5 - Body ground Always Below 1 Ω
      RD-7 - Body ground Always Below 1 Ω
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      RM-1 - Body ground Always 10 to 14 V

    NG:  Go to step  8

    OK: Go to next step. 

  6. INSPECT POWER SOURCE CONTROL ECU 
    1. Reconnect the connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (ACC) 8 to 14 V
      3. Fig 4: Identifying Terminal ACCD Of J55 Power Source Control ECU Connector
      G05829197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (COWL SIDE J/B - EACH SYSTEM) 

  7. REPLACE FAULTY J/B AND CHECK POWER SOURCE CONTROL ECU 
    1. Replace a faulty relay or J/B and then connect the power source control ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (ACC) 8 to 14 V
      3. Fig 5: Identifying Terminal ACCD Of J55 Power Source Control ECU Connector
      G05829197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: END 

  8. REPLACE FAULTY WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU 
    1. Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-11 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (ACC) 8 to 14 V
      3. Fig 6: Identifying Terminal ACCD Of J55 Power Source Control ECU Connector
      G05829199Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: END 

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