Brake Warning Light Remains ON [09/2018 - 10/2023]: 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 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.

      Refer to ABS Warning Light Remains ON [09/2018 - 10/2023] 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Turn the engine switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Brake Fluid Level Warning Switch [Brake Master Cylinder Reservoir Assembly])

2. Remove the reservoir filler cap and strainer.
3. Disconnect the A18 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.
4. Measure the resistance according to the value(s) in the table below.

   HINT: 

   A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A18-1 (+) - A18-2 (E)	Switch off (Float up)	10 kΩ or higher
   	Switch on (Float down)	Below 1 Ω

   HINT: 

   If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY. Refer to  REMOVAL [12/2017 - 10/2023] 

Result: 

OK 

See step  3

1. Disconnect the G34 combination meter assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G34-17 (SW) or A18-1 (+) - 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. Reinstall the reservoir filler cap and strainer.
2. Reconnect the A18 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.
3. Reconnect the G34 combination meter assembly connector.
4. Inspect the vacuum warning switch assembly.

   Refer to ON-VEHICLE INSPECTION [12/2017 - ]

   OK

   The vacuum warning switch assembly is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE VACUUM WARNING SWITCH ASSEMBLY. Refer to  REMOVAL [12/2017 - ] 

Result: 

OK 

See step  5

1. Disconnect the G34 combination meter assembly connector.
2. Disconnect the A4 vacuum warning switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G34-23 (IND) or A4-2 (+) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Turn the engine switch off.
2. Perform Active Test of the combination meter assembly using the Techstream.

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Brake Warning

3. Check the combination meter assembly.

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

NG 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 10/2023]