RM38N0EC _54 Brake _111814 BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS _0503031 ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for Gasoline Model) J

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS  ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for Gasoline Model)  Brake Hold Standby Indicator Light Circuit  


DESCRIPTION

The brake hold standby indicator light turns on if brake hold control is possible when the following conditions required for operation standby are met and the brake hold switch (electric parking brake switch assembly) is pressed while the ignition switch is ON.

Conditions required for operation standby:

(a)

The driver door is closed.

(b)

The driver seat belt is fastened.

(c)

The system is normal.



HINT:

If a malfunction occurs in one of the following systems, the brake hold operated indicator light will blink. If this occurs, perform troubleshooting on the malfunctioning system.

·

Brake system

·

Electric parking brake system



WIRING DIAGRAM

C531717E01
0.906,0.927 1.521,1.125 0.615,0.198 10 false CANL 0.896,1.74 1.51,1.938 0.615,0.198 10 false CANH 1.438,0.917 2.052,1.115 0.615,0.198 10 false E17 0.115,3.948 2.042,4.229 1.927,0.281 10 false Combination Meter Assembly 1.479,0.729 1.792,0.927 0.313,0.198 10 false 31 1.49,1.521 1.802,1.719 0.313,0.198 10 false 32 5.083,0.75 5.396,0.948 0.313,0.198 10 false 19 5.156,1.552 5.469,1.75 0.313,0.198 10 false 5 4.729,2.625 5.083,2.844 0.354,0.219 10 false 10 4.448,2.844 4.865,3.094 0.417,0.25 10 false +B 3.833,2.844 4.281,3.104 0.448,0.26 10 false E 3.573,2.615 3.917,2.854 0.344,0.24 10 false 12 5.115,2.625 5.427,2.823 0.313,0.198 10 false 42 5.375,0.927 5.99,1.125 0.615,0.198 10 false CANL 5.375,1.74 5.99,1.938 0.615,0.198 10 false CANH 5.354,2.844 5.917,3.094 0.563,0.25 10 false HZRI 3.01,2.979 3.625,3.177 0.615,0.198 10 false E29 3.01,3.146 5.219,3.76 2.208,0.615 10 false Brake Hold Switch (Electric Parking Brake Switch Assembly) 2.948,4.333 5.042,4.594 2.094,0.26 10 false : CAN Communication Line 6.49,2.74 7.104,2.938 0.615,0.198 10 false IC 5.302,3.948 5.917,4.146 0.615,0.198 10 false A40 5.302,4.104 6.854,4.49 1.552,0.385 10 false Skid Control ECU (Brake Actuator Assembly) 1.802,0.927 2.417,1.125 0.615,0.198 10 false E142 1.688,2.177 3.781,2.438 2.094,0.26 10 false *1: for Optitron Meter Type 1.698,2.385 3.792,2.646 2.094,0.26 10 false *2: for TFT Meter Type 1.885,0.729 2.198,0.927 0.313,0.198 10 false 14 1.885,1.521 2.198,1.719 0.313,0.198 10 false 31 1.438,1.719 2.052,1.917 0.615,0.198 10 false E17 1.813,1.729 2.427,1.927 0.615,0.198 10 false E142 1.479,1.156 1.792,1.354 0.313,0.198 10 false *1 1.51,1.948 1.823,2.146 0.313,0.198 10 false *1 1.896,1.146 2.208,1.344 0.313,0.198 10 false *2 1.906,1.958 2.219,2.156 0.313,0.198 10 false *2

PROCEDURE

1.PRE-CHECK
a.

If the brake hold standby indicator light does not illuminate even though the brake hold switch (electric parking brake switch assembly) is pushed, check that the brake hold function operation conditions are met.

1.

The driver door is closed.

2.

The driver seat belt is fastened.

3.

The system is normal.



Result:
Proceed to
NEXT



NEXT

2.READ VALUE USING GTS (BRAKE HOLD READY)
2.READ VALUE USING GTS (BRAKE HOLD READY)
a.

All of the following brake hold operation conditions are met:

1.

The driver door is closed.

2.

The driver seat belt is fastened.



b.

Check the brake hold standby indicator light and mode condition on the GTS changes according to brake hold switch (electric parking brake switch assembly) operation.

Chassis > Brake/EPB > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Brake Hold Ready Brake hold control permission status Not in stand-by mode / Stand-by mode Not in stand-by mode: Brake hold function not operating (brake hold indicator not illuminated)
Stand-by mode: Brake hold function stand-by state (brake hold indicator illuminated) 		-
Chassis > Brake/EPB > Data List
Tester Display
Brake Hold Ready
50003 435 164
Standard:
Brake Hold Switch (Electric Parking Brake Switch Assembly) Operation Mode Condition Display Brake Hold Standby Indicator Light
Not pressed Not in stand-by mode Does not come on
Pressing the brake hold switch (electric parking brake switch assembly) Stand-by mode come on



Result:
Result Proceed to
Indicator light and mode condition display do not change A
Mode condition display is normal, but indicator light does not change B
Indicator light and mode condition display are normal C



A

3.INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

B

INSPECT METER / GAUGE SYSTEM

for Optitron Meter Type: Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM (for Optitron Meter Type)>HOW TO PROCEED WITH TROUBLESHOOTING

for TFT Meter Type: Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM (for TFT Meter Type)>HOW TO PROCEED WITH TROUBLESHOOTING


C

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


3.INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model)>INSPECTION

OK:

The brake hold switch (electric parking brake switch assembly) is normal.


Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

NG

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE HOLD SWITCH>REMOVAL


4.CHECK HARNESS AND CONNECTOR (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY - BRAKE ACTUATOR 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 A40 skid control ECU (brake actuator assembly) connector.


c.

Disconnect the E29 brake hold switch (electric parking brake switch assembly) connector.


d.

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

OK:

No deformation or corrosion.



e.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(E29,A40)Location & Routing

Click Connector(E29)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Electric Parking Brake Switch Assembly

Click Connector(A40)Engine Compartment>Engine Room Main Wire / Transmission Wire>Brake Actuator Assembly

E29-10 (+B) - A40-42 (HZRI) Always Below 1 Ω
E29-10 (+B) or A40-42 (HZRI) - Body ground Always 10 kΩ or higher
E29-12 (E) - Body ground 1 minute or more after disconnecting the cable from the negative (-) battery terminal Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE BRAKE ACTUATOR ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR