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 Warning Light Remains ON  


DESCRIPTION

This procedure is for troubleshooting when the brake system warning light (red indicator) remains on but no DTCs are output.

The skid control ECU (brake actuator assembly) controls the brake system warning light (red indicator) in the combination meter assembly via CAN communication.

WIRING DIAGRAM

for Optitron Meter Type
C498184E08
5.948,0.677 6.521,0.948 0.573,0.271 10 false CANH 5.948,1.292 6.521,1.563 0.573,0.271 10 false CANL 0.729,1.271 1.302,1.542 0.573,0.271 10 false CANL 0.719,0.688 1.292,0.958 0.573,0.271 10 false CANH 5.698,1.104 6.021,1.375 0.323,0.271 10 false 19 5.646,0.51 5.969,0.781 0.323,0.271 10 false 5 1.292,1.052 1.615,1.323 0.323,0.271 10 false 31 1.281,0.458 1.604,0.729 0.323,0.271 10 false 32 1.292,3.552 1.615,3.823 0.323,0.271 10 false 12 2.094,3.646 2.417,3.917 0.323,0.271 10 false 1 4.073,3.635 4.396,3.906 0.323,0.271 10 false 2 5.5,4.521 6.073,4.792 0.573,0.271 10 false A40 5.49,4.698 7.031,5.146 1.542,0.448 10 false Skid Control ECU (Brake Actuator Assembly) 0.875,3.635 1.198,3.906 0.323,0.271 10 false SW 0.104,5.969 2.073,6.479 1.969,0.51 10 false Combination Meter Assembly 2.01,4.5 4.552,4.917 2.542,0.417 10 false Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Assembly) 2.031,4.292 2.354,4.563 0.323,0.271 10 false A1 3.927,6.125 5.635,6.594 1.708,0.469 10 false : CAN Communication Line 1.229,0.677 1.542,0.875 0.313,0.198 10 false E17 1.229,1.271 1.542,1.469 0.313,0.198 10 false E17 1.24,3.76 1.604,3.969 0.365,0.208 10 false E17

for TFT Meter Type
C498184E09
5.948,0.677 6.521,0.948 0.573,0.271 10 false CANH 5.948,1.292 6.521,1.563 0.573,0.271 10 false CANL 0.729,1.271 1.302,1.542 0.573,0.271 10 false CANL 0.719,0.688 1.292,0.958 0.573,0.271 10 false CANH 5.698,1.104 6.021,1.375 0.323,0.271 10 false 19 5.646,0.51 5.969,0.781 0.323,0.271 10 false 5 1.292,1.073 1.615,1.344 0.323,0.271 10 false 14 1.281,0.458 1.604,0.729 0.323,0.271 10 false 31 1.292,3.552 1.615,3.823 0.323,0.271 10 false 11 2.094,3.646 2.417,3.917 0.323,0.271 10 false 1 4.073,3.635 4.396,3.906 0.323,0.271 10 false 2 5.5,4.521 6.073,4.792 0.573,0.271 10 false A40 5.49,4.698 7.031,5.146 1.542,0.448 10 false Skid Control ECU (Brake Actuator Assembly) 0.875,3.635 1.198,3.906 0.323,0.271 10 false SW 0.104,5.969 2.073,6.479 1.969,0.51 10 false Combination Meter Assembly 2.01,4.5 4.552,4.917 2.542,0.417 10 false Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Assembly) 2.031,4.292 2.354,4.563 0.323,0.271 10 false A1 3.927,6.125 5.635,6.594 1.708,0.469 10 false : CAN Communication Line 1.229,0.677 1.542,0.875 0.313,0.198 10 false E142 1.229,1.271 1.542,1.469 0.313,0.198 10 false E142 1.24,3.76 1.604,3.969 0.365,0.208 10 false E142

CAUTION / NOTICE / HINT

NOTICE:

Before performing this procedure, depress the brake pedal and confirm that the stop lights illuminate.


PROCEDURE

1.PRE-CHECK
a.

Check that all of the following conditions required for the brake system warning light (red indicator) to turn off are met:

i.

The ABS warning light are not illuminated.

HINT:

If the ABS warning light remains illuminated, make sure that the conditions required for the ABS warning light to turn off are met.

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



ii.

The brake fluid level in the brake master cylinder reservoir assembly is not low.


iii.

Ensure that the brake booster has sufficient vacuum.

HINT:

When the vacuum inside the brake booster decreases, the brake system warning light (red indicator) comes on.




Result:
Proceed to
NEXT



NEXT

2.CHECK VEHICLE CONTROL HISTORY (RoB) (ELECTRONICALLY CONTROLLED BRAKE SYSTEM AND ELECTRIC PARKING BRAKE SYSTEM)
2.CHECK VEHICLE CONTROL HISTORY (RoB) (ELECTRONICALLY CONTROLLED BRAKE SYSTEM AND ELECTRIC PARKING BRAKE SYSTEM)
a.

Using the GTS, check for Vehicle Control History (RoB).

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

Chassis > Brake/EPB > Utility
Tester Display
Vehicle Control History (RoB)
50005 435 55
HINT:

If vehicle control history (RoB) is stored when the electronically controlled brake system and electric parking brake system are suspended, the brake system warning light (red indicator) illuminates.



Result:
Result Proceed to
There is no vehicle control history (RoB) for when the electronically controlled brake system was suspended. A
There is vehicle control history (RoB) for when the electronically controlled brake system was suspended. B



A

3.INSPECT BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY

B

PERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY (RoB)

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

NOTICE:

After performing troubleshooting and repair regarding vehicle control history (RoB), clear the vehicle control history (RoB).



3.INSPECT BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY

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

OK:

The brake fluid level warning switch (brake master cylinder reservoir assembly) is normal.


Result:
Result Proceed to
OK (for Optitron Meter Type) A
OK (for TFT Meter Type) B
NG C



A

4.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY)

B

6.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY)

C

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY

Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE MASTER CYLINDER>DISASSEMBLY


4.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR 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 E17 combination meter assembly connector.


c.

Disconnect the A1 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.


d.

Check both the connector case and the terminals 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(E17,A1)Location & Routing

Click Connector(E17)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Combination Meter Assembly

Click Connector(A1)Engine Compartment>Engine Room Main Wire / Transmission Wire>Brake Master Cylinder Sub-Assembly

E17-12 (SW) - A1-1 Always Below 1 Ω
E17-12 (SW) or A1-1 - Body ground Always 10 kΩ or higher
A1-2 - Body ground 1 minute or more after disconnecting the cable from the negative (-) battery terminal Below 1 Ω



Result:
Proceed to
OK
NG



OK

5.INSPECT COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.INSPECT COMBINATION METER ASSEMBLY
a.

Perform the Active Test of the combination meter assembly using the GTS.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM (for Optitron Meter Type)>DATA LIST / ACTIVE TEST


b.

Check the combination meter assembly.

Body Electrical > Combination Meter > Active Test
Tester Display
Brake Warning
50004 409 107
OK:

The brake system warning light (red indicator) turns on or off in accordance with GTS operation.



Result:
Proceed to
OK
NG



OK

REPLACE BRAKE ACTUATOR ASSEMBLY

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


NG

INSPECT METER / GAUGE SYSTEM

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


6.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR 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 E143 combination meter assembly connector.


c.

Disconnect the A1 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.


d.

Check both the connector case and the terminals 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(E143,A1)Location & Routing

Click Connector(E143)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Combination Meter Assembly

Click Connector(A1)Engine Compartment>Engine Room Main Wire / Transmission Wire>Brake Master Cylinder Sub-Assembly

E143-11 (SW) - A1-1 Always Below 1 Ω
E143-11 (SW) or A1-1 - Body ground Always 10 kΩ or higher
A1-2 - Body ground 1 minute or more after disconnecting the cable from the negative (-) battery terminal Below 1 Ω



Result:
Proceed to
OK
NG



OK

7.INSPECT COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.INSPECT COMBINATION METER ASSEMBLY
a.

Perform the Active Test of the combination meter assembly using the GTS.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM (for TFT Meter Type)>DATA LIST / ACTIVE TEST


b.

Check the combination meter assembly.


Body Electrical > Combination Meter > Active Test
Tester Display
Multi Display All (White)
50004 409 20
OK:

The multi-information display turns on or off in accordance with GTS operation.


Result:
Proceed to
OK
NG



OK

REPLACE BRAKE ACTUATOR ASSEMBLY

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


NG

INSPECT METER / GAUGE SYSTEM

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