BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C14C616; Electronic Brake Booster Control Module "A" Supply Voltage Circuit Voltage Below Threshold; 2022 - 2025 MY RAV4 RAV4 HV [12/2021

Last Modified: 05-08-2025	6.11:8.1.0	Doc ID: RM10000000214QY
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): C14C616; Electronic Brake Booster Control Module "A" Supply Voltage Circuit Voltage Below Threshold; 2022 - 2025 MY RAV4 RAV4 HV [12/2021 - ]

DTC

C14C616

Electronic Brake Booster Control Module "A" Supply Voltage Circuit Voltage Below Threshold

DESCRIPTION

Refer to DTC C110E14.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Note
C14C616	Electronic Brake Booster Control Module "A" Supply Voltage Circuit Voltage Below Threshold	Either of the following is detected: Any of the following is detected when the ECU internal voltage is 6.92 V or less: When operation of the main relay is requested, the relay output voltage is less than a certain value for 10.05 seconds or more. The stroke sensor value invalid for 10.2 seconds or more. The reaction force pressure sensor value invalid for 10.2 seconds or more. The voltage supplied to the servo pressure sensor is a certain value or less or a certain value or more for 10.06 seconds or more. The servo pressure sensor value invalid for 10.2 seconds or more. The voltage supplied to the reaction force pressure sensor is a certain value or less or a certain value or more for 10.06 seconds or more. When the internal voltage of the ECU is 8.3 V or less, the accumulator pressure sensor value is invalid for 10.8 seconds 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: C14C7 Output ECU: Both skid control ECUs

C14C616 DTC Detection Conditions

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4	Pattern 5
Diagnosis Condition	When the ECU internal voltage is 6.92 V or less	○	○	○	○	○
Malfunction Status	When operation of the main relay is requested, the relay output voltage is less than a certain value	○	-	-	-	-
	The stroke sensor value invalid	-	○	-	-	-
	The reaction force pressure sensor value invalid	-	-	○	-	-
	The voltage supplied to the servo pressure sensor is a certain value or less	-	-	-	○	-
	The voltage supplied to the servo pressure sensor is a certain value or more	-	-	-	-	○
Detection Time		10.05 seconds or more.	10.2 seconds or more.	10.2 seconds or more.	10.06 seconds or more.	10.06 seconds or more.
Number of Trips		1 trip	1 trip	1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

C14C616 DTC Detection Conditions

		Vehicle Condition
		Pattern 6	Pattern 7	Pattern 8	Pattern 9
Diagnosis Condition	When the ECU internal voltage is 6.92 V or less	○	○	○	-
Diagnosis Condition	When the internal voltage of the ECU is 8.3 V or less	-	-	-	○
Malfunction Status	The servo pressure sensor value invalid	○	-	-	-
	The voltage supplied to the reaction force pressure sensor is a certain value or less	-	○	-	-
	The voltage supplied to the reaction force pressure sensor is a certain value or more	-	-	○	-
	The accumulator pressure sensor value is invalid	-	-	-	○
Detection Time		10.2 seconds or more.	10.06 seconds or more.	10.06 seconds or more.	10.8 seconds or more.
Number of Trips		1 trip	1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

MONITOR DESCRIPTION

When the voltage at IG1 or IG2 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	C14C7: Brake system voltage circuit low
Required Sensors/Components(Main)	No. 2 skid control ECU (brake actuator assembly)
Required Sensors/Components(Related)	Speed sensor No. 2 skid control ECU (brake actuator assembly)
Frequency of Operation	Continuous
Duration	9.996 seconds: Case 1, 2 and Case 8 10.194 seconds: Case 3, 4 and 6 10.050 seconds: Case 5 and 7 10.794 seconds: Case 9
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Case 1

Monitor runs whenever the following DTCs are not stored	C123B: Brake system voltage input open circuit
Both of the following conditions are met	-
IG1	On
Vehicle speed	Higher than 3 km/h (1.864 mph)

Case 2

Monitor runs whenever the following DTCs are not stored	C123B: Brake system voltage input open circuit
All of the following conditions are met	-
IG1	On
IG2	On
Vehicle speed	Higher than 3 km/h (1.864 mph)

Case 3 to 9

Monitor runs whenever the following DTCs are not stored

None

TYPICAL MALFUNCTION THRESHOLDS

Case 1

IG1 voltage

9.5 V or less

Case 2

IG2 voltage

9.5 V or less

Case 3

All of the following conditions are met	-
Brake system voltage1	7.3 V or less
Stroke sensor1 data validity	Invalid
Stroke sensor output compare validity	Invalid

Case 4

Both of the following conditions are met	-
Brake system voltage1	8.5 V or less
Stroke simulator pressure sensor (Prct) data valid	Invalid

Case 5 and 7

Both of the following conditions are met	-
Brake system voltage1	8.5 V or less
Pressure sensor power supply voltage	6.5 V or less

Case 6

Both of the following conditions are met	-
Brake system voltage1	8.5 V or less
Servo pressure sensor (Psrv) data valid	Invalid

Case 8

Either of the following conditions is met	A or B
A. All of the following conditions are met	-
Ignition switch	Off
BS monitor voltage	Less than 3.3 V
Brake system voltage1	8.5 V or less
Main relay ON experience	On
B. All of the following conditions are met	-
Ignition switch	On (READY)
BS monitor voltage	Less than 3.3 V
Brake system voltage1	7.3 V or less
IG1 voltage	9.5 V or less
Main relay ON experience	On

Case 9

Both of the following conditions are met	-
Brake system voltage1	8.5 V or less
Accumulator pressure sensor (Pacc) data valid	Invalid

COMPONENT OPERATING RANGE

Case 1 and 2

Both of the following conditions are met	-
IG1 voltage	Higher than 9.5 V
IG2 voltage	Higher than 9.5 V

Case 3 to 9

Either of the following conditions is met	A or B
A. All of the following conditions are met	-
Ignition switch	Off
Command to Main relay	On
Brake system voltage1	Higher than 8.5 V
Power supply for brake pressure control solenoid	Higher than 9.4 V
B. All of the following conditions are met	-
Ignition switch	On (READY)
Command to Main relay	On
Brake system voltage1	Higher than 8.5 V
IG1 voltage	Higher than 9.5 V
Power supply for brake pressure control solenoid	Higher than 9.4 V

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.
Drive the vehicle at 10 km/h (6 mph) or more for 15 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

Refer to DTC C110E14.

Click here

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.
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After replacing the No. 1 skid control ECU (brake booster with master cylinder assembly), perform "Calibration" after performing "Reset Memory".
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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 C14C616 is output.	A
DTCs other than C14C616 are output.	B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

2.	CHECK HARNESS AND CONNECTOR (IG1, +BI1 AND BS 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) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A104-31 (IG1) - Body ground	Ignition switch ON	11 to 14 V
A104-14 (+BI1) - Body ground	Ignition switch ON	11 to 14 V
A104-15 (BS) - Body ground	Ignition switch ON	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