Brake Warning Light Does Not Come ON

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: Brake Warning Light does not Come ON
- Brake Warning Light does not Come ON

DESCRIPTION

The skid control ECU is connected to the combination meter via CAN communication.

WIRING DIAGRAM

Refer to Brake Warning Light Remains ON Brake Warning Light Remains ON.

INSPECTION PROCEDURE

NOTICE:
When replacing the brake booster with master cylinder (skid control ECU), perform initialization and calibration of the linear solenoid valve Initialization.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication system DTC is output Diagnosis System.

Result:





B -- INSPECT CAN COMMUNICATION SYSTEM Initial Inspection and Diagnostic Overview
A -- Continue to next step.

2. CHECK BRAKE WARNING LIGHT / RED (MALFUNCTION)

(a) Disconnect the skid control ECU connector.

(b) Turn the power switch on (IG).

(c) Check that the brake warning light / red (malfunction) comes on.

OK:

The brake warning light / red (malfunction) comes on.

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 part Problem Symptoms Table.

NG -- INSPECT COMBINATION METER

OK -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Removal

3. INSPECT COMBINATION METER

(a) Turn the power switch off.

(b) Reconnect the skid control ECU connector.

(c) Perform the Active Test of the combination meter (meter CPU) using the Techstream Scan Tool Testing and Procedures.

(d) Check the combination meter.

OK:

The brake warning light / red (malfunction) turns on or off in accordance with the 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 Problem Symptoms Table.

NG -- REPLACE NO. 3 METER CIRCUIT PLATE Disassembly

OK -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Removal