Toyota Yaris: Vehicle Stability Control System / ABS Pump Motor Control Circuit Open (C052C13,C052C49,C052F14)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / ABS Pump Motor Control Circuit Open (C052C13,C052C49,C052F14)

DESCRIPTION

The motor relay and motor fail safe relay are built into the brake actuator assembly.

When the skid control ECU (brake actuator assembly) operate ABS, TRC, VSC or brake assist, the motor relay turns ON and drives the motor pump built into the brake actuator assembly.

If any DTCs related to motor supply power are stored, fail-safe is performed and supply of power to the motor relay is cut by the motor fail safe relay.

If the voltage supplied to the motor relay (BM) is below the DTC detection threshold due to low voltage from the auxiliary battery or alternator, these DTCs may be stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
C052C13	ABS Pump Motor Control Circuit Open	Either of the following is detected: When the +BS terminal voltage is from 9.5 to 17.4 V with the motor relay ON while control operates, a relay contact OFF condition continues for 0.12 seconds or more. When the +BS terminal voltage is from 9.5 to 17.4 V, a motor relay supervision voltage malfunction continues for 0.12 seconds or more when the motor relay turns ON during control operation.	Wire harness and connector Skid control ECU (brake actuator assembly)	Brake
C052C49	ABS Pump Motor Control Internal Electronic Failure	Any of the following is detected: When the +BS terminal voltage is from 9.5 to 17.4 V, overcurrent in the motor relay and motor fail-safe relay continues for 0.05 seconds or more. Motor relay overcurrent continues for 0.05 seconds or more. When the +BS terminal voltage is from 9.5 to 17.4 V, a motor relay gate voltage malfunction continues for 0.12 seconds or more.	Wire harness and connector Skid control ECU (brake actuator assembly)	Brake
C052F14	ABS Pump Motor Supply Voltage Circuit Short to Ground or Open	When voltage at +BS terminal is 9.5 V or higher, open in BM terminal continues for 1 second or more.	Wire harness and connector Skid control ECU (brake actuator assembly)	Brake

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (BM TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A108 skid control ECU (brake actuator assembly) connector.

OK:

No deformation or corrosion.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A108-13 (BM) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A108-1 (GND2) - Body ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

(a) Reconnect the A108 skid control ECU (brake actuator assembly) connector.

(b) Operate the GTS to clear the codes.

Chassis > Brake > Clear DTCs

(d) Turn the ignition switch off.

4.	RECONFIRM DTC

(a) Start the engine.

(b) Drive the vehicle at a speed of 20 km/h (12 mph).

Chassis > Brake > Trouble Codes

(d) Check if the same DTC is output.

HINT:

If a speed signal of 20 km/h (12 mph) or more is sent to the skid control ECU (brake actuator assembly) with the ignition switch ON and the stop light switch assembly off, the ECU performs self-diagnosis of the motor and solenoid circuits.
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.

Result	Proceed to
C052C13, C052C49 and C052F14 are not output	A
C052C13, C052C49 or C052F14 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

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