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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Except HV) - Diagnostic Codes (2 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC C0597-49: Brake System Control Module "A" Internal Electronic Failure; DTC C12A5-1C: Left Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range; DTC C12B0-1C: Left Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range; DTC C12BB-1C: Right Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range; DTC C12C6-1C: Right Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range; DTC C12D1-1C: Left Rear Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range; DTC C12DC-1C: Left Rear Wheel ABS Release Solenoid Control Circuit Voltage Out of Range; DTC C12E7-1C: Right Rear Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range; DTC C12F2-1C: Right Rear Wheel ABS Release Solenoid Control Circuit Voltage Out of Range; DTC C12F6-62: Left Front Wheel ABS Hold Solenoid / Right Front Wheel ABS Hold Solenoid Signal Compare Failure; DTC C12F7-62: Left Rear Wheel ABS Hold Solenoid / Right Rear Wheel ABS Hold Solenoid Signal Compare Failure; DTC C13BF-62: Brake Pressure Control Solenoid A/B Signal Compare Failure; DTC C13C0-1C: Brake Pressure Control Solenoid "A" Control Circuit Voltage Out of Range; DTC C13C9-1C: Brake Pressure Control Solenoid "B" Control Circuit Voltage Out of Range [12/2019 - ] >> Description

DTC C0597-49: Brake System Control Module "A" Internal Electronic Failure; DTC C12A5-1C: Left Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range; DTC C12B0-1C: Left Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range; DTC C12BB-1C: Right Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range; DTC C12C6-1C: Right Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range; DTC C12D1-1C: Left Rear Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range; DTC C12DC-1C: Left Rear Wheel ABS Release Solenoid Control Circuit Voltage Out of Range; DTC C12E7-1C: Right Rear Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range; DTC C12F2-1C: Right Rear Wheel ABS Release Solenoid Control Circuit Voltage Out of Range; DTC C12F6-62: Left Front Wheel ABS Hold Solenoid / Right Front Wheel ABS Hold Solenoid Signal Compare Failure; DTC C12F7-62: Left Rear Wheel ABS Hold Solenoid / Right Rear Wheel ABS Hold Solenoid Signal Compare Failure; DTC C13BF-62: Brake Pressure Control Solenoid A/B Signal Compare Failure; DTC C13C0-1C: Brake Pressure Control Solenoid "A" Control Circuit Voltage Out of Range; DTC C13C9-1C: Brake Pressure Control Solenoid "B" Control Circuit Voltage Out of Range [12/2019 - ]: Description

The solenoid relay and solenoid valves are built into the brake actuator assembly.

The solenoid valves control the brake fluid pressure at each wheel cylinder.

When these DTCs are stored, the fail-safe function operates and the solenoid relay is turned off to prevent the solenoid valves from operating.

DTC No. Detection Item DTC Detection Condition Trouble Area
C0597-49 Brake System Control Module "A" Internal Electronic Failure When the +BS terminal voltage is from 9.5 to 17.4 V and the solenoid relay is ON, the relay contact is ON and the pump motor is in a low voltage state continuously for 0.1 seconds or more. Skid control ECU (Brake actuator assembly)
C12A5-1C Left Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range Any of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFLH) outputs OFF, open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFLH) outputs OFF, current is maintained for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFLH) outputs ON, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFLH) outputs ON, open circuit continues for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
C12B0-1C Left Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range Either of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SFLR) outputs OFF, reduction solenoid (SFLR) is ON continuously for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SFLR) outputs ON, reduction solenoid (SFLR) is OFF continuously for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
C12BB-1C Right Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range Any of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFRH) outputs OFF, open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFRH) outputs OFF, current is maintained for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFRH) outputs ON, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFRH) outputs ON, open circuit continues for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
C12C6-1C Right Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range Either of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SFRR) outputs OFF, reduction solenoid (SFRR) is ON continuously for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SFRR) outputs ON, reduction solenoid (SFRR) is OFF continuously for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
C12D1-1C Left Rear Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range Any of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRLH) outputs OFF, open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRLH) outputs OFF, current is maintained for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRLH) outputs ON, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRLH) outputs ON, open circuit continues for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
C12DC-1C Left Rear Wheel ABS Release Solenoid Control Circuit Voltage Out of Range Either of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SRLR) outputs OFF, reduction solenoid (SRLR) is ON continuously for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SRLR) outputs ON, reduction solenoid (SRLR) is OFF continuously for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
C12E7-1C Right Rear Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range Any of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRRH) outputs OFF, open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRRH) outputs OFF, current is maintained for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRRH) outputs ON, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRRH) outputs ON, open circuit continues for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
C12F2-1C Right Rear Wheel ABS Release Solenoid Control Circuit Voltage Out of Range Either of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SRRR) outputs OFF, reduction solenoid (SRRR) is ON continuously for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SRRR) outputs ON, reduction solenoid (SRRR) is OFF continuously for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
C12F6-62 Left Front Wheel ABS Hold Solenoid / Right Front Wheel ABS Hold Solenoid Signal Compare Failure A difference in holding solenoid (SFLH) and holding solenoid (SFRH) output accuracy continues for 0.2 seconds or more. Skid control ECU (Brake actuator assembly)
C12F7-62 Left Rear Wheel ABS Hold Solenoid / Right Rear Wheel ABS Hold Solenoid Signal Compare Failure A difference in holding solenoid (SRLH) and holding solenoid (SRRH) output accuracy continues for 0.2 seconds or more. Skid control ECU (Brake actuator assembly)
C13BF-62 Brake Pressure Control Solenoid A/B Signal Compare Failure A difference in master cylinder cut solenoid (SM1) and master cylinder cut solenoid (SM2) output accuracy continues for 0.2 seconds or more. Skid control ECU (Brake actuator assembly)
C13C0-1C Brake Pressure Control Solenoid "A" Control Circuit Voltage Out of Range Any of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM1) is on, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM1) is off, an open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM1) is on, an open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM1) is off, current continues to be applied for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
C13C9-1C Brake Pressure Control Solenoid "B" Control Circuit Voltage Out of Range Any of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM2) is on, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM2) is off, an open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM2) is on, an open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM2) is off, current continues to be applied for 0.05 seconds or more.
 Skid control ECU (Brake actuator assembly)
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