Brake Warning Light does not Come ON

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT BRAKE WARNING LIGHT

CHECK CAN COMMUNICATION LINE

CHECK DTC (CAN COMMUNICATION SYSTEM)

CHECK OPERATION OF BRAKE WARNING LIGHT (ACTIVE TEST)

Description

The BRAKE warning light comes on when brake fluid is insufficient, the parking brake is applied or the EBD is defective.

Wiring diagram

Inspection procedure

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration .

1.INSPECT BRAKE WARNING LIGHT

1. Disconnect the A24 skid control ECU connector.

2. Turn the ignition switch to ON.

3. Check that the BRAKE warning light comes on.

   OK:

   BRAKE warning light comes on.

   Result

   Result		Proceed to
   NG		A
   OK	LHD	B
   	RHD	C

B	REPLACE MASTER CYLINDER SOLENOID
C	REPLACE MASTER CYLINDER SOLENOID

A

2.CHECK CAN COMMUNICATION LINE

1. Turn the ignition switch off.

2. Connect the intelligent tester to the DLC3.

3. Turn the ignition switch to ON and the intelligent tester on.

4. Select "Bus Check" from the System Selection Menu screen, and follow the prompts on the screen to inspect the CAN Bus.

   OK:

   "Bus Check" indicates no malfunctions in CAN communication.

   Result

   Result		Proceed to
   OK		A
   NG	LHD	B
   	RHD	C

B	GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
C	GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

A

3.CHECK DTC (CAN COMMUNICATION SYSTEM)

1. Turn the ignition switch off.

2. Connect the intelligent tester to the DLC3.

3. Turn the ignition switch to ON and the intelligent tester on.

4. Check for DTCs (LHD: /RHD: ).

   Result

   Result		Proceed to
   CAN system DTC is not output		A
   CAN system DTC is output	LHD	B
   	RHD	C

B	GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
C	GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

A

4.CHECK OPERATION OF BRAKE WARNING LIGHT (ACTIVE TEST)

1. Turn the ignition switch off.

2. Connect the intelligent tester to the DLC3.

3. Turn the ignition switch to ON and the intelligent tester on.

4. Enter the following menus: Body Electrical / Combination Meter / Active Test.

5. Check the condition of the brake warning light by operating the intelligent tester.

   Combination Meter

   Tester Display	Test Part	Control Range	Diagnostic Note
   Indicat. Lamp Brake	Brake Warning Light	Warning light ON/OFF	-

   OK:

   The warning light turns on when operating the intelligent tester.

   Result

   Result		Proceed to
   OK		A
   NG	w/ Multi-information Display	B
   	w/o Multi-information Display	C

B	REPLACE COMBINATION METER ASSEMBLY
C	REPLACE COMBINATION METER ASSEMBLY

A
USE SIMULATION METHOD TO CHECK