Brake Warning Light Remains ON [10/2022 - ]: 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.
   2. The vacuum inside the brake booster decreases.

      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. With a sufficient level of brake fluid, disconnect the A1 brake fluid level warning switch (brake master cylinder reservoir assembly) connector and confirm that the brake system warning light (red indicator) illuminates.

   OK

   The brake system warning light (red indicator) does not turn 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

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

Result: 

B 

See step  7

Result: 

C 

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY 

Result: 

A 

See step  3

1. Turn the ignition switch off.
2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

   OK

   The connector is securely connected.

3. Disconnect the H21 combination meter 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
   H21-12 (SW) or A1-1 (+) - 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. Reconnect the H21 combination meter assembly connector.
2. Reconnect the A1 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.
3. Perform the Active Test of the combination meter assembly using the GTS.

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Brake Warning

4. Check the combination meter assembly.

   OK

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

   Result

   Result	Proceed to
   OK (w/o Stop and Start System)	A
   OK (w/ Stop and Start System)	B
   NG	C

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

C 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

A 

See step  5

1. Turn the ignition switch off.
2. Inspect the vacuum warning switch assembly.

   Refer to ON-VEHICLE INSPECTION [12/2019 - ]

   OK

   The vacuum warning switch assembly is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE VACUUM WARNING SWITCH ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

OK 

See step  6

1. Disconnect the A2 vacuum warning switch assembly connector.
2. Disconnect the H21 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H21-7 (VCM) - A2-2 (+)	Always	Below 1 Ω
   H21-7 (VCM) or A2-2 (+) - Body ground	Always	10 kΩ or higher
   A2-1 (E) - Body ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Turn the ignition switch off.
2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

   OK

   The connector is securely connected.

3. Disconnect the H112 combination meter 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
   H112-11 (SW) or A1-1 (+) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

1. Reconnect the H112 combination meter assembly connector.
2. Reconnect the A1 brake fluid level warning switch (brake master cylinder reservoir assembly) connector.
3. Perform the Active Test of the combination meter assembly using the GTS.

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Multi Display All (White)

4. Check the combination meter assembly.

   OK

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

   Result

   Result	Proceed to
   OK (w/o Stop and Start System)	A
   OK (w/ Stop and Start System)	B
   NG	C

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

C 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

Result: 

A 

See step  9

1. Turn the ignition switch off.
2. Inspect the vacuum warning switch assembly.

   Refer to ON-VEHICLE INSPECTION [12/2019 - ]

   OK

   The vacuum warning switch assembly is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE VACUUM WARNING SWITCH ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

OK 

See step  10

1. Disconnect the A2 vacuum warning switch assembly connector.
2. Disconnect the H112 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H112-27 (VCM) - A2-2 (+)	Always	Below 1 Ω
   H112-27 (VCM) or A2-2 (+) - Body ground	Always	10 kΩ or higher
   A2-1 (E) - Body ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR