Brake Control Warning Light does not Come ON [04/2018 - ]: Procedure

1. Check if CAN communication system DTCs are output.

   Refer to DIAGNOSIS SYSTEM [04/2018 - 08/2020] , or refer to DIAGNOSIS SYSTEM [08/2020 - 08/2021] , or refer to DIAGNOSIS SYSTEM [08/2021 - ]

   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 [04/2018 - ] 

Result: 

A 

See step  2

1. Select the Active Test on the Techstream.

   Refer to DATA LIST / ACTIVE TEST [04/2018 - ]

   Chassis > ABS/VSC/TRAC > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   ECB Warning Light	Brake warning light / yellow (minor malfunction)	Warning light ON/OFF	Observe combination meter assembly ECB: Electronically Controlled Brake System

   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 > Active Test 

   Active Test Display
   ECB Warning Light

   Data List Display
   ECB Warning Light

2. Check the operating condition of the brake warning light / yellow (minor malfunction) when operating it using the Techstream.

   Result

   Result	Proceed to
   Brake warning light / yellow (minor malfunction) in the Data List does not change using the Active Test.	A
   Brake warning light / yellow (minor malfunction) in the Data List turns ON/OFF using the Active Test.	B

Result: 

A 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

Result: 

B 

See step  3

1. Perform the Active Test of the combination meter assembly (meter CPU) using the Techstream.

   Refer to DATA LIST / ACTIVE TEST [04/2018 - 08/2021] , or refer to DATA LIST / ACTIVE TEST [08/2021 - ]

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   ECB Warning

2. Check the combination meter assembly.

   OK

   The brake warning light / yellow (minor malfunction) turns on or off in accordance with Techstream operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

Result: 

NG 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ]