Toyota Yaris: Vehicle Stability Control System / Brake System Control Module "A" Internal Electronic Failure (C059749,...,C13C91C)

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Brake System Control Module "A" Internal Electronic Failure (C059749,...,C13C91C)

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 this DTC is 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	DTC Output from
C059749	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)	Brake
C12A51C	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)	Brake
C12B01C	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)	Brake
C12BB1C	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)	Brake
C12C61C	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)	Brake
C12D11C	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)	Brake
C12DC1C	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)	Brake
C12E71C	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)	Brake
C12F21C	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)	Brake
C12F662	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)	Brake
C12F762	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)	Brake
C13BF62	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)	Brake
C13C01C	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)	Brake
C13C91C	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)	Brake

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

Click here

PROCEDURE

CLEAR DTC

(a) Operate the GTS to clear the codes.

Chassis > Brake > Clear DTCs

(b) Press the DTC clear button.

2.	RECONFIRM DTC

(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.

(b) Operate the GTS to read the DTCs.

Chassis > Brake > Trouble Codes

Result	Proceed to
C059749, C12A51C, C12B01C, C12BB1C, C12C61C, C12D11C, C12DC1C, C12E71C, C12F21C, C12F662, C12F762, C13BF62, C13C01C and C13C91C are not output	A
C059749, C12A51C, C12B01C, C12BB1C, C12C61C, C12D11C, C12DC1C, C12E71C, C12F21C, C12F662, C12F762, C13BF62, C13C01C or C13C91C is output	B

HINT:

If a speed signal of 20 km/h (12 mph) or more is input to the skid control ECU (brake actuator assembly), with the ignition switch ON and the stop light switch off, the ECU performs self-diagnosis of the solenoid circuit.
If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake actuator assembly).
If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

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