Brake Warning Light does not Come ON

BRAKE CONTROL: VEHICLE STABILITY CONTROL 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 the CAN and multiplex communication systems.

WIRING DIAGRAM

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



NOTICE:
When replacing the skid control ECU, perform zero point calibration and store system information Vehicle Stability Control System.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

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

Result:





B -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK MULTIPLEX COMMUNICATION SYSTEM

(a) Check if a multiplex communication system DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- INSPECT MULTIPLEX COMMUNICATION SYSTEM Multiplex Communication System
A -- Continue to next step.

3. CHECK BRAKE WARNING LIGHT

(a) Disconnect the skid control ECU connectors.

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

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

OK:

The brake warning light comes on.

HINT
If troubleshooting has been carried out according to the 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 ASSEMBLY

OK -- REPLACE SKID CONTROL ECU Removal

4. INSPECT COMBINATION METER ASSEMBLY

(a) Turn the engine switch off.

(b) Reconnect the skid control ECU connectors.

(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 turns on or off in accordance with the Techstream operation.

HINT
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.

NG -- REPLACE COMBINATION METER ASSEMBLY

OK -- REPLACE SKID CONTROL ECU Removal