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Home >> Lexus >> 2009 >> LS 460L RWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control >> Electronically Controlled Brake System >> DTC C1315/31 SMC1 Changeover Solenoid Malfunction; DTC C1316/32 SMC2 Changeover Solenoid Malfunction; DTC C1352/21 Front Increasing Pressure Solenoid RH Malfunction; DTC C1353/23 Front Increasing Pressure Solenoid LH Malfunction; DTC C1354/25 Rear Increasing Pressure Solenoid RH Malfunction; DTC C1355/27 Rear Increasing Pressure Solenoid LH Malfunction; DTC C1356/22 Front Decreasing Pressure Solenoid RH Malfunction; DTC C1357/24 Front Decreasing Pressure Solenoid LH Malfunction; DTC C1358/26 Rear Decreasing Pressure Solenoid RH Malfunction; DTC C1359/28 Rear Decreasing Pressure Solenoid LH Malfunction >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the skid control ECU or brake actuator, perform initialization of linear solenoid valve and calibration (see INITIALIZATION  ).
  1. INSPECT BRAKE ACTUATOR 
    1. Disconnect the A27 actuator connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      A27-20 (SMC1) - A27-19 (BS1) Always 15.3 to 25.0 Ω
      A27-6 (SMC2) - A27-7 (BS2) Always 15.3 to 25.0 Ω
      A27-8 (FRA+) - A27-5 (FRA-) Always 3.6 to 6.0 Ω
      A27-22 (FRR+) - A27-21 (FRR-) Always 3.6 to 6.0 Ω
      A27-13 (FLA+) - A27-14 (FLA-) Always 3.6 to 6.0 Ω
      A27-27 (FLR+) - A27-28 (FLR-) Always 3.6 to 6.0 Ω
      A27-12 (RRA+) - A27-11 (RRA-) Always 3.6 to 6.0 Ω
      A27-10 (RLA+) - A27-9 (RLA-) Always 3.6 to 6.0 Ω
      A27-26 (RRR+) - A27-25 (RRR-) Always 4.4 to 7.0 Ω
      A27-24 (RLR+) - A27-23 (RLR-) Always 4.4 to 7.0 Ω
      Fig 1: Identifying Brake Actuator Connector Terminals
      G04949656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE BRAKE ACTUATOR (See  REMOVAL   ) 

      OK: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR) 
    1. Disconnect the A19 and A21 ECU connectors.
    2. Disconnect the A27 actuator connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      A19-5 (SMC1) - A27-20 (SMC1) Always Below 1 Ω
      A19-32 (BSO1) - A27-19 (BS1) Always Below 1 Ω
      A19-17 (FRA+) - A27-8 (FRA+) Always Below 1 Ω
      A19-18 (FRA-) - A27-5 (FRA-) Always Below 1 Ω
      A19-4 (FRR+) - A27-22 (FRR+) Always Below 1 Ω
      A19-3 (FRR-) - A27-21 (FRR-) Always Below 1 Ω
      A19-19 (RLA+) - A27-10 (RLA+) Always Below 1 Ω
      A19-20 (RLA-) - A27-9 (RLA-) Always Below 1 Ω
      A19-34 (RLR+) - A27-24 (RLR+) Always Below 1 Ω
      A19-33 (RLR-) - A27-23 (RLR-) Always Below 1 Ω
      A21-6 (SMC2) - A27-6 (SMC2) Always Below 1 Ω
      A21-32 (BSO2) - A27-7 (BS2) Always Below 1 Ω
      A21-17 (FLA+) - A27-13 (FLA+) Always Below 1 Ω
      A21-18 (FLA-) - A27-14 (FLA-) Always Below 1 Ω
      A21-4 (FLR+) - A27-27 (FLR+) Always Below 1 Ω
      A21-3 (FLR-) - A27-28 (FLR-) Always Below 1 Ω
      A21-20 (RRA+) - A27-12 (RRA+) Always Below 1 Ω
      A21-21 (RRA-) - A27-11 (RRA-) Always Below 1 Ω
      A21-34 (RRR+) - A27-26 (RRR+) Always Below 1 Ω
      A21-33 (RRR-) - A27-25 (RRR-) Always Below 1 Ω
      Fig 2: Identifying A19, A21 And A27 Connector Terminals
      G04949657Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      A19-5 (SMC1) - Body ground Always 10 kΩ or higher
      A19-32 (BSO1) - Body ground Always 10 kΩ or higher
      A19-17 (FRA+) - Body ground Always 10 kΩ or higher
      A19-18 (FRA-) - Body ground Always 10 kΩ or higher
      A19-4 (FRR+) - Body ground Always 10 kΩ or higher
      A19-3 (FRR-) - Body ground Always 10 kΩ or higher
      A19-19 (RLA+) - Body ground Always 10 kΩ or higher
      A19-20 (RLA-) - Body ground Always 10 kΩ or higher
      A19-34 (RLR+) - Body ground Always 10 kΩ or higher
      A19-33 (RLR-) - Body ground Always 10 kΩ or higher
      A21-6 (SMC2) - Body ground Always 10 kΩ or higher
      A21-32 (BSO2) - Body ground Always 10 kΩ or higher
      A21-17 (FLA+) - Body ground Always 10 kΩ or higher
      A21-18 (FLA-) - Body ground Always 10 kΩ or higher
      A21-4 (FLR+) - Body ground Always 10 kΩ or higher
      A21-3 (FLR-) - Body ground Always 10 kΩ or higher
      A21-20 (RRA+) - Body ground Always 10 kΩ or higher
      A21-21 (RRA-) - Body ground Always 10 kΩ or higher
      A21-34 (RRR+) - Body ground Always 10 kΩ or higher
      A21-33 (RRR-) - Body ground Always 10 kΩ or higher

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  3. RECONFIRM DTC 
    1. Clear the DTC (see DTC CHECK/CLEAR  ).
    2. Turn the engine switch on (IG).
    3. Check if the same DTCs are recorded (see DTC CHECK/CLEAR  ).

      HINT:

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result 

      RESULT CHART

      Result Proceed to
      DTCs (C1315/31, C1316/32, C1352/21, C1353/23, C1354/25, C1355/27, C1356/22, C1357/24, C1358/26 and C1359/28) are not output A
      DTCs (C1315/31, C1316/32, C1352/21, C1353/23, C1354/25, C1355/27, C1356/22, C1357/24, C1358/26 and C1359/28) are output B

      B: REPLACE SKID CONTROL ECU (See  REMOVAL   ) 

      A: END 

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