BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C12D112,...,C12DC49; Left Rear Wheel ABS Hold Solenoid Control Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla HV [09/2022

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM1000000025DUF
Model Year Start: 2023	Model: Corolla	Prod Date Range: [09/2022 - ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C12D112,...,C12DC49; Left Rear Wheel ABS Hold Solenoid Control Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ]

DTC

C12D112

Left Rear Wheel ABS Hold Solenoid Control Circuit Short to Battery

DTC

C12D114

Left Rear Wheel ABS Hold Solenoid Control Circuit Short to Ground or Open

DTC

C12D11C

Left Rear Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range

DTC

C12D11E

Left Rear Wheel ABS Hold Solenoid Control Circuit Resistance Out of Range

DTC

C12D149

Left Rear Wheel ABS Hold Solenoid Control Internal Electronic Failure

DTC

C12DC12

Left Rear Wheel ABS Release Solenoid Control Circuit Short to Battery

DTC

C12DC14

Left Rear Wheel ABS Release Solenoid Control Circuit Short to Ground or Open

DTC

C12DC1C

Left Rear Wheel ABS Release Solenoid Control Circuit Voltage Out of Range

DTC

C12DC1E

Left Rear Wheel ABS Release Solenoid Control Circuit Resistance Out of Range

DTC

C12DC49

Left Rear Wheel ABS Release Solenoid Control Internal Electronic Failure

DESCRIPTION

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

The rear solenoid valve LH controls the brake fluid pressure of the rear wheel cylinder LH 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
C12D112	Left Rear 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: C12D4 Output ECU: Skid control ECU (brake actuator assembly)
C12D114	Left Rear 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: C12D3 Output ECU: Skid control ECU (brake actuator assembly)
C12D11C	Left Rear 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: C12D2 (Case 1 to 4) Output ECU: Skid control ECU (brake actuator assembly)
C12D11E	Left Rear 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: C12D2 (Case 5) Output ECU: Skid control ECU (brake actuator assembly)
C12D149	Left Rear 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: C12D1 Output ECU: Skid control ECU (brake actuator assembly)
C12DC12	Left Rear 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: C12DF Output ECU: Skid control ECU (brake actuator assembly)
C12DC14	Left Rear 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: C12DE Output ECU: Skid control ECU (brake actuator assembly)
C12DC1C	Left Rear 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: C12DD (Case 1 to 4) Output ECU: Skid control ECU (brake actuator assembly)
C12DC1E	Left Rear 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: C12DD (Case 5) Output ECU: Skid control ECU (brake actuator assembly)
C12DC49	Left Rear 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: C12DC Output ECU: Skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

C12D1 and C12DC:

When the ABS solenoid is not operating and it is detected by the self-diagnosis function 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.

C12D2 (Case 1) and C12DD (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.

C12D2 (Case 2) and C12DD (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.

C12D2 (Case 3) and C12DD (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.

C12D2 (Case 4) and C12DD (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.

C12D2 (Case 5) and C12DD (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.

C12D3 and C12DE:

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.

C12D4 and C12DF:

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	C12D1: Cyclic valve test for SRLH (built in self-test) C12D2 (Case 1): Valve feedback monitoring for SRLH (PWM check) C12D2 (Case 2): Valve feedback monitoring for SRLH (valve-coil path interruption) C12D2 (Case 3): Cyclic valve test (current leakage test) for SRLH C12D2 (Case 4): Valve feedback monitoring for SRLH (general application specific integrated circuit valve driver failure) C12D2 (Case 5): Cyclic valve test (valve resistance check) for SRLH C12D3: Cyclic valve test (silent valve driver test) for SRLH C12D4: Cyclic valve test (valve actuation register test) for SRLH C12DC: Cyclic valve test for SRLR (built in self-test) C12DD (Case 1): Valve feedback monitoring for SRLR (PWM check) C12DD (Case 2): Valve feedback monitoring for SRLR (valve-coil path interruption) C12DD (Case 3): Cyclic valve test (current leakage test) for SRLR C12DD (Case 4): Valve feedback monitoring for SRLR (general application specific integrated circuit valve driver failure) C12DD (Case 5): Cyclic valve test (valve resistance check) for SRLR C12DE: Cyclic valve test (silent valve driver test) for SRLR C12DF: Cyclic valve test (valve actuation register test) for SRLR
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	-: C12D1, C12D2 (Case 3 and 5), C12D3, C12D4, C12DD (Case 3 and 5), C12DE and C12DF 0.03 seconds: C12D2 (Case 1, 2 and 4), C12DD (Case 1, 2 and 4) 20 seconds: C12DC
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