Brake Warning Light Remains ON [11/2021 - ]: 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 PROBLEM SYMPTOMS TABLE [11/2021 - ]

   2. The brake fluid level in the brake master cylinder reservoir assembly is not low.
   3. 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

Result: 

NEXT 

See step  2

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

   Refer to VEHICLE CONTROL HISTORY (RoB) [11/2021 - ]

   Chassis > Brake/EPB > Utility 

   Tester Display
   Vehicle Control History (RoB)

   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

Result: 

B 

PERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY (RoB) 

Refer to VEHICLE CONTROL HISTORY (RoB) [11/2021 - ]

Result: 

A 

See step  3

Refer to ON-VEHICLE INSPECTION [11/2021 - ]

OK

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

Result

Result: 

NG 

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY. Refer to  DISASSEMBLY [11/2021 - ] 

Result: 

OK 

See step  4

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

   OK

   The connector is securely connected.

2. Disconnect the D21 combination meter assembly connector.
3. Disconnect the A1 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.
4. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D21-11 (SW) - A1-1 (+)	Always	Below 1 Ω
   D21-11 (SW) or A1-1 (+) - Body ground	Always	10 kΩ or higher
   A1-2 (E) - Body ground	1 minute or more after disconnecting the cable from the negative (-) battery terminal	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

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

   Refer to DATA LIST / ACTIVE TEST [11/2021 - ]

2. Check the combination meter assembly.

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Brake Warning

   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 [11/2021 - ] 

Result: 

NG 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ]