Brake Control Warning Light does not Come ON [10/2015 - ]: Procedure

1. Check if CAN communication system DTCs are output.

   w/ Central Gateway ECU: Refer to DIAGNOSIS SYSTEM [10/2015 - ]

   w/o Central Gateway ECU: Refer to DIAGNOSIS SYSTEM [10/2015 - ]

   Result

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

Result: 

B 

INSPECT CAN COMMUNICATION SYSTEM 

w/ Central Gateway ECU: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]

w/o Central Gateway ECU: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the Active Test on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2015 - ] ).
   ABS/VSC/TRAC
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   ECB* Warning Light	Brake warning light / yellow (minor malfunction)	Warning light ON/OFF	Observe combination meter assembly

   *: Electronically Controlled Brake System

4. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2015 - ] ).
   ABS/VSC/TRAC
   
   

   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	-

   *: Electronically Controlled Brake System

5. 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

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the parts (Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] ).

Result: 

A 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

B 

See step  3

1. Turn the power switch off.
2. Perform the Active Test of the combination meter assembly (meter CPU) using the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2015 - ] ).
3. Check the combination meter assembly.

   OK

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

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the parts (Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] ).

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

INSPECT METER / GAUGE SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )