Brake Warning Light does not Come ON: Wiring Diagram
WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
When replacing the skid control ECU, perform zero point calibration (See CALIBRATION
).
- CHECK CAN COMMUNICATION SYSTEM
- Check if the CAN communication system DTC is output (See DIAGNOSIS SYSTEM
).
Result
CONDITION CHARTCondition Proceed to DTC is not output A DTC is output B
B : INSPECT CAN COMMUNICATION SYSTEM
A : GO TO NEXT STEP
- Check if the CAN communication system DTC is output (See DIAGNOSIS SYSTEM
).
- CHECK MULTIPLEX COMMUNICATION SYSTEM
- Check if the multiplex communication system DTC is output (See DTC CHECK/CLEAR
).
Result
CONDITION CHARTCondition Proceed to DTC is not output A DTC is output B
B : INSPECT MULTIPLEX COMMUNICATION SYSTEM
A : GO TO NEXT STEP
- Check if the multiplex communication system DTC is output (See DTC CHECK/CLEAR
).
- CHECK BRAKE WARNING LIGHT
- Disconnect the skid control ECU connector.
- Turn the engine switch on (IG).
- Check that the BRAKE warning light comes on.
OK: 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 (See PROBLEM SYMPTOMS TABLE ).
OK : REPLACE SKID CONTROL ECU
NG : GO TO NEXT STEP
- INSPECT COMBINATION METER ASSEMBLY
- Turn the engine switch off.
- Reconnect the skid control ECU connector.
- Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See DATA LIST / ACTIVE TEST
).
OK: The BRAKE warning light turns on or off in accordance with the intelligent tester.
HINT:
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE ).
NG : REPLACE COMBINATION METER ASSEMBLY
OK : REPLACE SKID CONTROL ECU