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Home › Lexus › 2008 › LS 600hL › Repair and Diagnosis › Brakes › Traction Control › Brake Control › Electronically Controlled Brake System › DTC C1377/43 Capacitor Malfunction › Inspection Procedure

Inspection Procedure

  1. CHECK FREEZE FRAME DATA 
    1. Check the information code from the "FREEZE FRAME DATA" memorized when the DTC (C1377/43) is stored (see FREEZE FRAME DATA  ).

      Result 

      RESULT REFERENCE

      Result Proceed to
      Information codes (109 and 110) are output A
      Information codes (101, 102, 105, 106 and 108) are output B
      Information code (103) is output C

    B: REPLACE BRAKE CONTROL POWER SUPPLY ASSEMBLY  (See REMOVAL  )

    C:  Go to step  6

    A: Go to next step 

  2. INSPECT FUSE (ABS MAIN4) 
    1. Remove the ABS MAIN4 fuse from the luggage room junction block
    2. Measure the resistance of the fuse

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      ABS MAIN4 fuse Always Below 1 Ω

    NG: REPLACE FUSE 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (BRAKE CONTROL POWER SUPPLY - BODY GROUND) 
    Fig 1: Identifying S49 Connector Terminals
    G05774036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the S49 power supply connector.
    2. Measure the voltage according to the value(s) in the table below

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      S49-8 (+BC) - Body ground Always 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      S49-14 (GND) - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. INSPECT BRAKE CONTROL POWER SUPPLY ASSEMBLY (OUT1 AND OUT2) 
    Fig 2: Identifying S49 Connector Terminals
    G05774037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the S49 power supply connector
    2. Measure the voltage according to the value(s) in the table below

      HINT:

      Perform inspection while the brake is not operated

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      S49-1 (OUT1) - Body ground While the brake is not operated 11 to 14 V
      S49-7 (OUT2) - Body ground While the brake is not operated 11 to 14 V

      Result 

      RESULT REFERENCE

      Result Proceed to
      NG A
      OK B

    B:  Go to step  8

    A: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE CONTROL POWER SUPPLY) 
    1. Disconnect the A19 and A21 ECU connectors.
    2. Disconnect the S49 power supply connector
    3. Measure the resistance according to the value(s) in the table below

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A19-38 (CBI1) - S49-1 (OUT1) Always Below 1 Ω
      A21-40 (CBI2) - S49-7 (OUT2) Always Below 1 Ω
      A19-38 (CBI1) - Body ground Always 10 kΩ or higher
      A21-40 (CBI2) - Body ground Always 10 kΩ or higher

      Result 

      RESULT REFERENCE

      Result Proceed to
      NG A
      OK B
      Fig 3: Identifying A19, A21 And S49 Connector Terminals
      G05774038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B:  Go to step  8

    A: REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. INSPECT BATTERY 
    1. Check the battery voltage

      Standard voltage: 

      11 to 14 V 

    NG: RECHARGE OR REPLACE BATTERY  (See REPAIR INSTRUCTION )

    OK: Go to next step 

  7. INSPECT BRAKE CONTROL POWER SUPPLY ASSEMBLY (+BC TERMINAL) 
    1. Disconnect the S49 power supply connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      S49-8 (+BC) - Body ground Always 11 to 14 V
      Fig 4: Identifying S49 Connector Terminals
      G05774039Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (+BC CIRCUIT) 

    OK: Go to next step 

  8. RECONFIRM DTC 
    1. Clear the DTC (see DTC CHECK / CLEAR  ).
    2. Turn the power switch ON (IG)
    3. Check if the same DTC is 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 REFERENCE

      Result Proceed to
      DTC (C1377/43) is not output A
      DTC (C1377/43) is output B

    B: REPLACE BRAKE CONTROL POWER SUPPLY ASSEMBLY  (See REMOVAL  )

    A: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

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