RM38T0EC _54 Brake _112606 BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS _0608077 ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for HEV Model) C

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for HEV Model) C117A49 Brake System Control Module "A" System Voltage Line Internal Electronic Failure C137BA2 Brake System Control Module "A" System Voltage System Voltage Low

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS, brake assist, regenerative braking, etc. operation.

This DTC is stored when the +BS terminal voltage meets one of the DTC detection conditions due to a malfunction in the power supply or charging circuit such as the auxiliary battery or DC/DC converter circuit, etc.

The DTC is cleared when the +BS terminal voltage returns to normal.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C117A49	Brake System Control Module "A" System Voltage Line Internal Electronic Failure	The vehicle speed is 15 km/h (9 mph) or more and the +BS terminal voltage is 9.6 V or more, the skid control ECU (brake actuator assembly) turns on more than one valve at the same time within a short period of time and the valve relay supply voltage drop exceeds the threshold.*	· Wire harness or connector · Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	· SAE Code: C117A · Output ECU: Skid control ECU (brake actuator assembly)
C137BA2	Brake System Control Module "A" System Voltage System Voltage Low	Any of the following is detected: 1. The vehicle speed is 6 km/h (4 mph) or more and the +BS terminal voltage (soft low voltage) is less than 9.6 V for 1 second or more. 2. The vehicle speed is 6 km/h (4 mph) or more and the +BS terminal voltage (hard low voltage) is less than 6.9 V for 1 second or more. 3. The +BS terminal voltage is less than 6.7 V and the skid control ECU (brake actuator assembly) judges that power supply voltage is abnormal for 0.06 seconds or more. 4. When the system has started, the +BS terminal voltage is less than 5 V for 0.5 seconds or more. 5. The +BS terminal voltage is less than 2.6 V for 0.2 seconds or more.	· Wire harness or connector · Skid control ECU (brake actuator assembly)	Does not come on	Brake/EPB	Output ECU: Skid control ECU (brake actuator assembly)

*: The skid control ECU (brake actuator assembly) monitors the resistance of the power source line at the +BS terminal. A malfunction is detected when an abnormality occurs in the +BS terminal wire harness or its connection and the skid control ECU (brake actuator assembly) determines that the wiring resistance at the +BS terminal exceeds the standard resistance.

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 15 km/h (9 mph) or more for 1 second. [*]

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.

WIRING DIAGRAM

1.417,1.125 2.948,1.365 1.531,0.24 10 false from Auxiliary Battery 3.688,1.313 4.813,1.594 1.125,0.281 10 false ABS NO. 2 5.667,1.031 5.979,1.229 0.313,0.198 10 false 30 5.677,2.813 5.99,3.01 0.313,0.198 10 false 46 5.969,1.156 6.385,1.396 0.417,0.24 10 false +BS 5.969,2.938 6.385,3.177 0.417,0.24 10 false GND1 5.583,3.906 6.042,4.104 0.458,0.198 10 false A151 5.583,4.052 7.115,4.458 1.531,0.406 10 false Skid Control ECU (Brake Actuator Assembly) 3.677,2.188 4.896,2.448 1.219,0.26 10 false ABS NO. 1 5.719,1.917 6.031,2.115 0.313,0.198 10 false 1 5.969,2.042 6.385,2.281 0.417,0.24 10 false +BM 1.417,2 2.948,2.24 1.531,0.24 10 false from Auxiliary Battery

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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PROCEDURE

1.CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

1.5,0.104 1.906,0.396 0.406,0.292 1.094,1.885 0.667,1.031 true 1.552,0.156 2.167,0.354 0.615,0.198 10 false A151 1.156,1.823 1.771,2.021 0.615,0.198 10 false +BS 0.167,0.115 0.479,0.313 0.313,0.198 10 false *a

*a	Front view of wire harness connector (to skid control ECU (Brake Actuator Assembly))

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

OK:: The connector is securely connected.

Disconnect the A151 skid control ECU (brake actuator assembly) connector.

Check both the connector case and the terminals for deformation and corrosion.

OK:: No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A151-30 (+BS) - Body ground	Always	11 to 14 V

Result:

Proceed to
OK
NG

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

REPAIR OR REPLACE HARNESS OR CONNECTOR