BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C12BB12,...,C12C649; Right Front Wheel ABS Hold Solenoid Control Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla HV [09/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000025DUD
Model Year Start: 2023	Model: Corolla	Prod Date Range: [09/2022 - ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C12BB12,...,C12C649; Right Front Wheel ABS Hold Solenoid Control Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ]

DTC

C12BB12

Right Front Wheel ABS Hold Solenoid Control Circuit Short to Battery

DTC

C12BB14

Right Front Wheel ABS Hold Solenoid Control Circuit Short to Ground or Open

DTC

C12BB1C

Right Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range

DTC

C12BB1E

Right Front Wheel ABS Hold Solenoid Control Circuit Resistance Out of Range

DTC

C12BB49

Right Front Wheel ABS Hold Solenoid Control Internal Electronic Failure

DTC

C12C612

Right Front Wheel ABS Release Solenoid Control Circuit Short to Battery

DTC

C12C614

Right Front Wheel ABS Release Solenoid Control Circuit Short to Ground or Open

DTC

C12C61C

Right Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range

DTC

C12C61E

Right Front Wheel ABS Release Solenoid Control Circuit Resistance Out of Range

DTC

C12C649

Right Front Wheel ABS Release Solenoid Control Internal Electronic Failure

DESCRIPTION

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

The front solenoid valve RH controls the brake fluid pressure of the front wheel cylinder RH of the vehicle.

When this DTC is stored, the fail-safe function operates and the ABS solenoid relay is turned off to prevent the solenoid valves from operating.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C12BB12	Right Front Wheel ABS Hold Solenoid Control Circuit Short to Battery	A short to +B in the solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12BE Output ECU: Skid control ECU (brake actuator assembly)
C12BB14	Right Front Wheel ABS Hold Solenoid Control Circuit Short to Ground or Open	An open or short in the solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12BD Output ECU: Skid control ECU (brake actuator assembly)
C12BB1C	Right Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range	A current leak in the solenoid circuit is detected during the self-test. The solenoid operation request signal and solenoid operation feedback signal do not match for a certain period of time.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12BC (Case 1 to 4) Output ECU: Skid control ECU (brake actuator assembly)
C12BB1E	Right Front Wheel ABS Hold Solenoid Control Circuit Resistance Out of Range	An abnormal resistance in the solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12BC (Case 5) Output ECU: Skid control ECU (brake actuator assembly)
C12BB49	Right Front Wheel ABS Hold Solenoid Control Internal Electronic Failure	An internal malfunction in the solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12BB Output ECU: Skid control ECU (brake actuator assembly)
C12C612	Right Front Wheel ABS Release Solenoid Control Circuit Short to Battery	A short to +B in the solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12C9 Output ECU: Skid control ECU (brake actuator assembly)
C12C614	Right Front Wheel ABS Release Solenoid Control Circuit Short to Ground or Open	An open or short in the solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12C8 Output ECU: Skid control ECU (brake actuator assembly)
C12C61C	Right Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range	A current leak in the solenoid circuit is detected during the self-test. The solenoid operation request signal and solenoid operation feedback signal do not match for a certain period of time.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12C7 (Case 1 to 4) Output ECU: Skid control ECU (brake actuator assembly)
C12C61E	Right Front Wheel ABS Release Solenoid Control Circuit Resistance Out of Range	An abnormal resistance in the solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12C7 (Case 5) Output ECU: Skid control ECU (brake actuator assembly)
C12C649	Right Front Wheel ABS Release Solenoid Control Internal Electronic Failure	An internal malfunction in the solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C12C6 Output ECU: Skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

C12BB and C12C6:

When the ABS solenoid is not operating and the self-diagnosis function detects that there is an internal malfunction in the ABS solenoid circuit, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C12BC (Case 1) and C12C7 (Case 1):

When it is detected by the self-diagnosis function that the feedback value from the ABS solenoid drive circuit does not match the operation request value, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C12BC (Case 2) and C12C7 (Case 2):

When the downstream voltage of the ABS solenoid or the current flowing in the ABS solenoid is less than a certain value, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C12BC (Case 3) and C12C7 (Case 3):

When the ABS solenoid is not operating and the current flowing in the ABS solenoid exceeds a certain value (current leak is detected), the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C12BC (Case 4) and C12C7 (Case 4):

If the current flowing in the ABS solenoid circuit, circuit temperature, or voltage drop within the circuit is a certain value or more, the skid control ECU (brake actuator assembly) judges that there is an ABS solenoid overcurrent malfunction and illuminates the MIL and stores this DTC.

C12BC (Case 5) and C12C7 (Case 5):

If the ABS solenoid is not operating and the resistance value of the ABS solenoid is outside of a certain range, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C12BD and C12C8:

If the current in the ABS solenoid circuit, voltage or temperature is less than or exceeds a certain value, or the operation request value and feedback value deviate by a certain value or more, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C12BE and C12C9:

When it is detected by the self-diagnosis function that there is a short to +B in the ABS solenoid circuit, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	C12BB: Cyclic valve test for SFRH (built in self-test) C12BC (Case 1): Valve feedback monitoring for SFRH (PWM check) C12BC (Case 2): Valve feedback monitoring for SFRH (valve-coil path interruption) C12BC (Case 3): Cyclic valve test (current leakage test) for SFRH C12BC (Case 4): Valve feedback monitoring for SFRH (general application specific integrated circuit valve driver failure) C12BC (Case 5): Cyclic valve test (valve resistance check) for SFRH C12BD: Cyclic valve test (silent valve driver test) for SFRH C12BE: Cyclic valve test (valve actuation register test) for SFRH C12C6: Cyclic valve test for SFRR (built in self-test) C12C7 (Case 1): Valve feedback monitoring for SFRR (PWM check) C12C7 (Case 2): Valve feedback monitoring for SFRR (valve-coil path interruption) C12C7 (Case 3): Cyclic valve test (current leakage test) for SFRR C12C7 (Case 4): Valve feedback monitoring for SFRR (general application specific integrated circuit valve driver failure) C12C7 (Case 5): Cyclic valve test (valve resistance check) for SFRR C12C8: Cyclic valve test (silent valve driver test) for SFRR C12C9: Cyclic valve test (valve actuation register test) for SFRR
Required Sensors/Components(Main)	Skid control ECU (brake actuator assembly)
Required Sensors/Components(Related)	Skid control ECU (brake actuator assembly)
Frequency of Operation	During initial checking
Duration	-: C12BB, C12BC (Case 3 and 5), C12BD, C12BE, C12C7 (Case 3 and 5), C12C8 and C12C9 0.03 seconds: C12BC (Case 1, 2 and 4), C12C7 (Case 1, 2 and 4) 20 seconds: C12C6
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

COMPONENT OPERATING RANGE

TMC's intellectual property

CONFIRMATION DRIVING PATTERN

NOTICE:

When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off.
Turn the ignition switch to ON (READY) and turn the GTS on.
Wait for 1 second or more. [*]
HINT:

[*]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Chassis / Brake/EPB* / Utility / All Readiness.
*: Electric Parking Brake System
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform driving pattern again.

PROCEDURE

1.	REPLACE BRAKE ACTUATOR ASSEMBLY

Click here

END