Brake Control Warning Light Remains ON [10/2020 - 10/2023]: Procedure

1. Check if CAN communication system DTCs are output.

   Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2020 - 11/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 10/2023]

   Result

   Result	Proceed to
   DTCs are not output.	A
   DTCs are output.	B

Result: 

B 

INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2023] 

Result: 

A 

See step  2

1. Check if the skid control ECU assembly connector is securely connected.

   OK

   The connector is securely connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTOR TO SKID CONTROL ECU ASSEMBLY CORRECTLY 

Result: 

OK 

See step  3

1. Check the auxiliary battery voltage.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Auxiliary battery	Power switch on (IG)	11 to 14 V
   Auxiliary battery	Power switch on (READY)	11 to 15.5 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CHARGE OR REPLACE AUXILIARY BATTERY 

Result: 

OK 

See step  4

1. Disconnect the A11 skid control ECU assembly connector.
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A11-2 (IG1) - Body ground	Power switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

Result: 

OK 

See step  5

1. Turn the power switch off.
2. Disconnect the A13, A10 and A12 skid control ECU assembly connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A10-1 (GND) - Body ground	Always	Below 1 Ω
   A11-3 (GND2) - Body ground	Always	Below 1 Ω
   A11-1 (GND3) - Body ground	Always	Below 1 Ω
   A12-3 (GND4) - Body ground	Always	Below 1 Ω
   A12-1 (GND5) - Body ground	Always	Below 1 Ω
   A13-3 (GND6) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

Result: 

OK 

See step  6

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the Data List on the Techstream.

   Refer to DATA LIST / ACTIVE TEST [10/2020 - 10/2023]

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   ECB Warning Light	Brake warning light / yellow (minor malfunction)	ON or OFF	ON: Warning light on OFF: Warning light off	ECB: Electronically Controlled Brake System

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display
   ECB Warning Light

   ECB: Electronically Controlled Brake System

4. Check the Techstream display condition of the brake warning light / yellow (minor malfunction).

   Result

   Result	Proceed to
   OFF is displayed.	A
   ON is displayed.	B

Result: 

A 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2023] 

Result: 

B 

REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]