Brake Warning Light does not Come ON

DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.

WIRING DIAGRAM

Refer to Brake Warning Light Remains ON (See page ).

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page ).

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output (See page ).

Result

Result	Proceed to
DTC is not output	A
DTC is output	B

B

CHECK CAN COMMUNICATION SYSTEM

A

1. PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE WARNING LIGHT)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

(f) According to the display on the Techstream, perform the Active Test.

ABS/VSC/TRAC

Tester Display	Measurement Item	Control Range	Diagnostic Note
Brake Warning Light	Brake warning light	Warning light OFF/ON	Observe combination meter Vehicle condition: Vehicle stopped

(g) When performing the Brake Warning Light Active Test, check Brake Warning Light in the Data List.

ABS/VSC/TRAC

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Brake Warning Light	Brake warning light	OFF or ON	OFF: Warning light off ON: Warning light on	-

Result

Result	Proceed to
Brake warning light in the Data List turns ON/OFF using the Active Test	A
Brake warning light in the Data List does not change using the Active Test	B

B

REPLACE BRAKE ACTUATOR ASSEMBLY

A

1. INSPECT COMBINATION METER ASSEMBLY

(a) Turn the ignition switch off.

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

(c) Check the combination meter assembly.

OK:

The brake warning light turns on or off in accordance with the Techstream.

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

INSPECT METER / GAUGE SYSTEM