Brake Warning Light Remains ON [09/2022 - ]: Procedure

1. Check that all of the following conditions required for the brake system warning light (red indicator) to turn off are met:
   1. The brake fluid level in the brake master cylinder reservoir assembly is not low.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. With a sufficient level of brake fluid, disconnect the A125 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

Result: 

OK 

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY 

Refer to DISASSEMBLY [09/2022 - ]

Result: 

NG 

See step  3

1. Disconnect the A51 skid control ECU (brake actuator assembly) connector.
2. Disconnect the A125 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A51-4 (LBL) or A125-1 (+) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

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

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Brake Warning

2. 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

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY 

Refer to REMOVAL [09/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

Result: 

NG 

INSPECT METER / GAUGE SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2022 - 11/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2022 - ]