BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C110E14; Brake Booster Motor "A" Supply Voltage Circuit Short to Ground or Open; 2022 - 2025 MY RAV4 RAV4 HV [12/2021

Last Modified: 05-08-2025	6.11:8.1.0	Doc ID: RM10000000214PZ
Model Year Start: 2022	Model: RAV4	Prod Date Range: [12/2021 - ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C110E14; Brake Booster Motor "A" Supply Voltage Circuit Short to Ground or Open; 2022 - 2025 MY RAV4 RAV4 HV [12/2021 - ]

DTC

C110E14

Brake Booster Motor "A" Supply Voltage Circuit Short to Ground or Open

DESCRIPTION

If a malfunction is detected in the power supply circuit, the No. 1 skid control ECU (brake booster with master cylinder assembly) power source voltage drops, or there is insufficient voltage to operate the main relay, the No. 2 skid control ECU (brake actuator assembly) will store these DTCs.

If the auxiliary battery voltage is temporarily low, these DTCs may be stored.

HINT:

DTCs C125600 or C125609 may also be memorized if there is a drop in power source voltage.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Note
C110E14	Brake Booster Motor "A" Supply Voltage Circuit Short to Ground or Open	When the voltage at terminal +BI1 is more than 7.3 V, the voltage at terminal MRI1 is less than 5.7 V for 1 second or more.	Improperly connected connector, deformation or corrosion of terminals Wire harness and connector No. 1 skid control ECU (brake booster with master cylinder assembly)	Comes on	SAE Code: C110F Output ECU: Both skid control ECUs

MONITOR DESCRIPTION

When the voltage at MRI1 drops due to a malfunction in the auxiliary battery and hybrid control system (charging circuit), the No. 2 skid control ECU (brake actuator assembly) judges that there is a drop in the power supply and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	C110F: Brake system voltage circuit low
Required Sensors/Components(Main)	No. 2 skid control ECU (brake actuator assembly)
Required Sensors/Components(Related)	No. 2 skid control ECU (brake actuator assembly)
Frequency of Operation	Continuous
Duration	1 second: C110F (Case 1) 1.002 seconds: C110F (Case 2)
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

C14C7 (Case 3 to 9): Brake system voltage circuit low

Case 1

Brake system voltage 1

Higher than 7.3 V

Case 2

All of the following conditions are met	-
Brake system voltage 1	Higher than 7.3 V
Motor relay input signal permission	Off
Command to motor relay	Off
Motor duty output order value	0%

TYPICAL MALFUNCTION THRESHOLDS

All

MRI1 voltage

Less than 5.7 V

COMPONENT OPERATING RANGE

C110F (Case 1)

All of the following conditions are met	A, B, C and D
A. Brake system voltage 1	Higher than 7.3 V
B. MRI1 voltage	5.7 V or more
C. All of the following conditions are met at the ECU status (last IG ON timing final)	-
Brake system voltage fail (C12FA, C12FB)	Not detected
Brake booster motor fail (C141C, C141D, C141E, C141F)	Not detected
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510)	Not detected
D. All of the following conditions are met at the ECU status (pre main)	-
Brake system voltage fail (C121F, C12FA, C12FB)	Not detected
Brake booster motor fail (C141C)	Not detected
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510)	Not detected

C110F (Case 2)

All of the following conditions are met	A, B, C, D, E, F and G
A. Brake system voltage 1	Higher than 7.3 V
B. Motor relay input signal permission	Off
C. Command to motor relay	Off
D. Motor duty output order value	0%
E. MRI1 voltage	5.7 V or more
F. All of the following conditions are met at the ECU status (last IG ON timing final)	-
Brake system voltage fail (C12FA, C12FB)	Not detected
Brake booster motor fail (C141C, C141D, C141E, C141F)	Not detected
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510)	Not detected
G. All of the following conditions are met at the ECU status (pre main)	-
Brake system voltage fail (C121F, C12FA, C12FB)	Not detected
Brake booster motor fail (C141C)	Not detected
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510)	Not detected

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 2 seconds 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.
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.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Before performing troubleshooting, make sure to confirm that the auxiliary battery voltage is normal.
Click here
After replacing the No. 1 skid control ECU (brake booster with master cylinder assembly), perform "Calibration" after performing "Reset Memory".
Click here

PROCEDURE

CHECK DTC

(a) Check the DTCs that are output.

Chassis > Brake Booster > Trouble Codes

Chassis > Brake/EPB > Trouble Codes

Result	Proceed to
Only DTC C110E14 is output.	A
DTCs other than C110E14 are output.	B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

2.	CHECK HARNESS AND CONNECTOR (+BI1 AND MRI1 TERMINAL)

(a) Turn the ignition switch off.

*a	Front view of wire harness connector (to No. 1 Skid Control ECU (Brake Booster with Master Cylinder Assembly))

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

OK:

The connector is securely connected.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A104-14 (+BI1) - Body ground	Always	11 to 14 V
A104-1 (MRI1) - Body ground	Always	11 to 14 V

Result	Proceed to
11 to 14 V.	A
Below 11 V.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR