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Home >> Lexus >> 2009 >> LS 460L AWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication >> Can Communication System >> DTC U0130 Lost Communication with Steering Effort Control Module >> Inspection Procedure

Inspection Procedure

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
      NOTE:
      • After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (see INITIALIZATION ).
  2. CHECK FOR OPEN IN CAN BUS WIRE (STEERING CONTROL ECU BRANCH WIRE) 
    1. Disconnect the A41 and A42 steering control ECU connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Switch Condition Specified Condition
      A41-9 (CA1H) - A41-20 (CA1L) Engine switch off 54 to 69 Ω
      A42-4 (CA2H) - A42-9 (CA2L) Engine switch off 54 to 69 Ω
      Fig 1: Identifying A41 And A42 Steering Control ECU Connectors Terminals
      G06198491Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE STEERING CONTROL ECU BRANCH WIRE OR CONNECTOR (CA1H, CA1L, CA2H, CA2L) 

      OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (STEERING CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (see INITIALIZATION ).
    2. Disconnect the A42 and A43 steering control ECU connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Condition Specified Condition
      A42-7 (PGND) - Body ground Always Below 1 Ω
      A43-8 (PGD2) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Switch Condition Specified Condition
      A42-10 (+B1) - Body ground Always 11 to 14 V
      A42-8 (PIG) - Body ground Always 11 to 14 V
      A42-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Fig 2: Identifying A42 And A43 Steering Control ECU Connector Terminal
      G06198492Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE STEERING CONTROL ECU  (See REMOVAL )

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