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Home >> Lexus >> 2018 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Electronically Controlled Brake System (Diagnostic Codes) (3 Of 7) >> Electronically Controlled Brake System >> DTC C1311: Open Circuit in Main Relay 1; DTC C1312: Short Circuit in Main Relay 1; DTC C1313: Open Circuit in Main Relay 2; DTC C1314: Short Circuit in Main Relay 2 [08/2019 - 07/2020] >> Confirmation Driving Pattern
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Confirmation Driving Pattern

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off.
  6. Turn the power switch on (READY).
  7. Wait 1 second.
  8. Turn the Techstream on.
  9. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
  10. Read the DTCs.

    HINT: 

    • If a DTC is output, the system is malfunctioning.
    • If a DTC is not output, perform the following procedure.
  11. If the DTCs are not output, perform a universal trip and check for permanent DTCs.

    Refer to DTC CHECK / CLEAR [08/2019 - ]

    HINT: 

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTCs are output, the system is normal.
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