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Home >> Lexus >> 2019 >> 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 C1311-11: Open in Main Relay 1 Circuit; DTC C1312-12: Short in Main Relay 1 Circuit; DTC C1313-13: Open in Main Relay 2 Circuit; DTC C1314-14: Short in Main Relay 2 Circuit [10/2015 - 08/2018] >> Description
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DTC C1311-11: Open in Main Relay 1 Circuit; DTC C1312-12: Short in Main Relay 1 Circuit; DTC C1313-13: Open in Main Relay 2 Circuit; DTC C1314-14: Short in Main Relay 2 Circuit [10/2015 - 08/2018]: Description

The ABS main relay supplies power to the changeover solenoid and the linear solenoid.

The ABS main relay remains on for approximately 2 minutes after the power switch is turned off and the input of brake pedal operation signals stops, and supplies power to the system to keep it ready to operate.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1311-11 Open in Main Relay 1 Circuit 1 Either of the following is detected:
  1. The ABS main relay 1 contact is not turned ON (BS01 terminal voltage less than 3.5 V) for 0.2 seconds or more when the ABS main relay 1 ON is requested while +BI1 terminal voltage is 7.5 V or more.
  2. When terminal +BI1 voltage is less than 7.5 V and the ABS main relay 1 contact is not turned ON (BS01 terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay 1 ON is requested.
  • Open or short in ABS main relay 1 circuit
  • Skid control ECU assembly
 Electronically controlled brake system DTC
C1312-12 Short in Main Relay 1 Circuit 3 The ABS main relay 1 contact is turned ON (BS01 terminal voltage 6.5 V or more) for 1 second or more when the ABS main relay 1 OFF is requested.
  • Short in ABS main relay 1 circuit
  • ABS main relay 1 internal stuck
  • Skid control ECU assembly
 Electronically controlled brake system DTC
C1313-13 Open in Main Relay 2 Circuit 4 Either of the following is detected:
  1. The ABS main relay 2 contact is not turned ON (BS02 terminal voltage less than 3.5 V) for 0.2 seconds or more when the ABS main relay 2 ON is requested while +BI2 terminal voltage is 7.5 V or more.
  2. When terminal +BI2 voltage is less than 7.5 V and the ABS main relay 2 contact is not turned ON (BS02 terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay 2 ON is requested.
  • Open or short in ABS main relay 2 circuit
  • Skid control ECU assembly
 Electronically controlled brake system DTC
C1314-14 Short in Main Relay 2 Circuit 6 The ABS main relay 2 contact is turned ON (BS02 terminal voltage 6.5 V or more) for 1 second or more when the ABS main relay 2 OFF is requested.
  • Short in ABS main relay 2 circuit
  • ABS main relay 2 internal stuck
  • Skid control ECU assembly
 Electronically controlled brake system DTC
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