RM3660EC _54 Brake _080770 BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS _0392591 ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for HV Model) J

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS  ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for HV 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

C514866E06
3.479,2.75 3.615,2.958 0.135,0.208 10 false 2 4.563,2.75 4.688,2.927 0.125,0.177 10 false 1 3.083,3.063 3.604,3.25 0.521,0.188 10 false A150 3.083,3.229 5.146,3.781 2.063,0.552 10 false Brake Fluid Level Warning Switch (Brake Master Cylinder Reservoir Assembly) 3.667,2.969 3.823,3.167 0.156,0.198 10 false E 4.344,2.958 4.5,3.156 0.156,0.198 10 false + 5.167,2.75 5.521,2.979 0.354,0.229 10 false 4 5.354,2.99 5.74,3.177 0.385,0.188 10 false LBL 4.948,3.917 6.135,4.125 1.188,0.208 10 false A144 4.948,4.083 7.052,4.469 2.104,0.385 10 false Skid Control ECU (Brake Actuator Assembly) 2.917,4.323 4.625,4.531 1.708,0.208 10 false : CAN Communication Line 0.125,3.927 2,4.135 1.875,0.208 10 false Combination Meter Assembly 6.438,2.813 6.615,2.979 0.177,0.167 10 false IC

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



Result:
Proceed to
NEXT



NEXT

2.INSPECT BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY
2.INSPECT BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY
a.

With a sufficient level of brake fluid, disconnect the A150 brake fluid level warning switch (brake master cylinder reservoir assembly) connector and confirm that the brake system warning light (red indicator) turns off.

OK:

The brake system warning light (red indicator) turns off.


HINT:

If the brake system warning light (red indicator) turns off, there is a short in the brake fluid level warning switch (brake master cylinder reservoir assembly) circuit.



Result:
Proceed to
OK
NG



OK

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY

Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE MASTER CYLINDER (for HV Model)>DISASSEMBLY


NG

3.CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY)
3.CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY)
a.

Disconnect the A144 skid control ECU (brake actuator assembly) connector.


b.

Disconnect the A150 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A144-4 (LBL) or A150-1 (+) - Body ground Always 10 kΩ or higher



Result:
Result Proceed to
OK (except 12.3 Inch Display) A
OK (for 12.3 Inch Display) B
NG C



A

4.INSPECT COMBINATION METER ASSEMBLY

B

5.INSPECT COMBINATION METER ASSEMBLY

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.INSPECT COMBINATION METER ASSEMBLY
a.

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

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

b.

Check the combination meter assembly.

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 HV Model)>REMOVAL


NG

INSPECT METER / GAUGE SYSTEM

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM (except 12.3 Inch Display)>HOW TO PROCEED WITH TROUBLESHOOTING


5.INSPECT COMBINATION METER ASSEMBLY
a.

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

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

b.

Check the combination meter assembly.

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 HV Model)>REMOVAL


NG

INSPECT METER / GAUGE SYSTEM

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM (for 12.3 Inch Display)>HOW TO PROCEED WITH TROUBLESHOOTING