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)  P057112  Brake Switch "A" Circuit Short to Battery  


DESCRIPTION

The skid control ECU (brake actuator assembly) receives stop light switch assembly signals and uses them to determine whether or not the brakes are applied.

DTCs may be stored if either of the following occurs:

·

Stop light switch assembly stuck on malfunction.

·

The accelerator and brake pedals are depressed simultaneously.*


HINT:

*: The skid control ECU (brake actuator assembly) may store this DTC upon judging that a stuck on malfunction has occurred when the accelerator pedal and brake pedal are depressed simultaneously. However, this does not indicate a malfunction.


DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from Note
P057112 Brake Switch "A" Circuit Short to Battery The vehicle speed is 10 km/h (6 mph) or more, the accelerator pedal is depressed, the master cylinder pressure is 0.5 MPa (5.1 kgf/cm2, 72.5 psi) or less, and the stop light switch assembly is on for 60 seconds or more.
·

Stop light switch assembly

·

Stop light switch assembly installation

·

Wire harness or connector

·

Skid control ECU (brake actuator assembly)

·

Hybrid vehicle control ECU

·

Certification ECU (smart key ECU assembly)

·

Electric brake booster (brake booster with master cylinder assembly)


Does not come on Brake/EPB Output ECU: Skid control ECU (brake actuator assembly)

CAUTION / NOTICE / HINT

NOTICE:
·

Inspect the fuses for circuits related to this system before performing the following procedure.

·

DTC precaution

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HEV Model)>PRECAUTION

Procedure to clear warning lights (When not clearing DTCs)
Procedure
1.

Repair or replacement.

2.

Turn the ignition switch to ON.

3.

Drive the vehicle and depress the brake pedal 2 or 3 times to clear the warning lights.





PROCEDURE

1.CHECK BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY INSTALLATION
a.

Check the brake pedal height and stop light switch assembly installation.

Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE PEDAL (for HEV Model)>ADJUSTMENT

OK:

The brake pedal height and stop light switch assembly installation are normal.



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY OUTPUT CIRCUIT)

NG

ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY

Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE PEDAL (for HEV Model)>ADJUSTMENT


2.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY OUTPUT CIRCUIT)
a.
C440416C93
0.375,0.667 0.813,0.927 0.438,0.26 2.167,1.677 1.854,1.052 true 0.167,0.177 0.479,0.333 0.313,0.156 10 false *a 2.177,1.708 2.333,1.906 0.156,0.198 10 false L 0.458,0.719 0.948,1.052 0.49,0.333 10 false A53
*a Component with harness connected
(Stop Light Switch 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.



b.

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


c.

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

OK:

No deformation or corrosion.



d.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A53-3 (L) - Body ground Brake pedal released Below 1.5 V



Result:
Proceed to
OK
NG



OK

REPLACE BRAKE ACTUATOR ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR (for HEV Model)>REMOVAL


NG

3.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)
3.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)
C491449C03
0.25,1 0.667,1.25 0.417,0.25 1.365,1.833 1.531,1.417 true 0.344,1.042 0.677,1.24 0.333,0.198 10 false A53 1.292,1.844 1.51,2.063 0.219,0.219 10 false L 0.167,0.177 0.479,0.333 0.313,0.156 10 false *a
*a Front view of wire harness connector
(to Stop Light Switch Assembly)


a.

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

OK:

The connector is securely connected.



b.

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


c.

Disconnect the A53 stop light switch assembly connector.


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
A53-3 (L) - Body ground Always Below 1.5 V



Result:
Proceed to
OK
NG



OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>REMOVAL


NG

4.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
4.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
C491449C03
0.25,1 0.667,1.25 0.417,0.25 1.365,1.833 1.531,1.417 true 0.344,1.042 0.677,1.24 0.333,0.198 10 false A53 1.292,1.844 1.51,2.063 0.219,0.219 10 false L 0.167,0.177 0.479,0.333 0.313,0.156 10 false *a
*a Front view of wire harness connector
(to Stop Light Switch Assembly)


a.

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

OK:

The connector is securely connected.



b.

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


c.

Disconnect the A53 stop light switch assembly connector.


d.

Disconnect the A197 hybrid vehicle control ECU connector.


e.

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

OK:

No deformation or corrosion.



f.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A53-3 (L) - Body ground Always Below 1.5 V



Result:
Result
OK
NG



OK

REPLACE HYBRID VEHICLE CONTROL ECU

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID VEHICLE CONTROL ECU>REMOVAL


NG

5.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)
5.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)
C491449C03
0.25,1 0.667,1.25 0.417,0.25 1.365,1.833 1.531,1.417 true 0.344,1.042 0.677,1.24 0.333,0.198 10 false A53 1.292,1.844 1.51,2.063 0.219,0.219 10 false L 0.167,0.177 0.479,0.333 0.313,0.156 10 false *a
*a Front view of wire harness connector
(to Stop Light Switch Assembly)


a.

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

OK:

The connector is securely connected.



b.

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


c.

Disconnect the A53 stop light switch assembly connector.


d.

Disconnect the A197 hybrid vehicle control ECU connector.


e.

Disconnect the A194 electric brake booster (brake booster with master cylinder assembly) connector.


f.

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

OK:

No deformation or corrosion.



g.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A53-3 (L) - Body ground Always Below 1.5 V



Result:
Proceed to
OK
NG



OK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE BOOSTER (for HEV Model)>REMOVAL


NG

6.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - SMART KEY ECU ASSEMBLY)
6.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - SMART KEY ECU ASSEMBLY)
C491449C03
0.25,1 0.667,1.25 0.417,0.25 1.365,1.833 1.531,1.417 true 0.344,1.042 0.677,1.24 0.333,0.198 10 false A53 1.292,1.844 1.51,2.063 0.219,0.219 10 false L 0.167,0.177 0.479,0.333 0.313,0.156 10 false *a
*a Front view of wire harness connector
(to Stop Light Switch Assembly)


a.

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

OK:

The connector is securely connected.



b.

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


c.

Disconnect the A53 stop light switch assembly connector.


d.

Disconnect the A197 hybrid vehicle control ECU connector.


e.

Disconnect the A194 electric brake booster (brake booster with master cylinder assembly) connector.


f.

Disconnect the I223 certification ECU (smart key ECU assembly) connector.


g.

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

OK:

No deformation or corrosion.



h.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A53-3 (L) - Body ground Always Below 1.5 V



Result:
Proceed to
OK
NG



OK

REPLACE SMART KEY ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR