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Power Steering ECU Communication Stop Mode: Procedure

WARNING: This page is about a different car, the 2009 Lexus IS 350 and 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OPEN IN CAN BUS WIRE (POWER STEERING ECU BRANCH LINE) 
    1. Turn the engine switch off.
    2. Disconnect the power steering ECU connector.
    3. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying Power Steering ECU Connector
      GTY129317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      A31-2 (CANH) - A31-3 (CANL) Engine switch off 54 to 69 Ω

    NG → REPAIR OR REPLACE POWER STEERING ECU BRANCH WIRE OR CONNECTOR (CANH, CANL) 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (IG, PGND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 2: Identifying Wire Harness (IG, PGND)
      GTY129316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A31-5 (PGND) - Body ground Always Below 1 Ω
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A31-9 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE POWER STEERING ECU 

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