Brake Warning Light does not Come ON: Procedure
WARNING: This page is about a different car, the 2009 Lexus IS 350 and 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK CAN COMMUNICATION SYSTEM
- Check if a CAN communication system DTC is output. Refer to DIAGNOSIS SYSTEM
.
Result
Result Proceed to DTC is not output A DTC is output B
B → See step 6
A: Go to next step
- Check if a CAN communication system DTC is output. Refer to DIAGNOSIS SYSTEM
.
- CHECK MULTIPLEX COMMUNICATION SYSTEM
- Check if a multiplex communication system DTC is output. Refer to DTC CHECK / CLEAR
.
Result
Result Proceed to DTC is not output A DTC is output B
B → See step 7
A: Go to next step
- Check if a multiplex communication system DTC is output. Refer to 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
The brake warning light 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. Refer to PROBLEM SYMPTOMS TABLE .
NG → See step 4
OK → See step 5
- INSPECT COMBINATION METER ASSEMBLY
- Turn the engine switch off.
- Reconnect the skid control ECU connector.
- Perform the Active Test of the combination meter (meter CPU) using the Techstream. Refer to DATA LIST / ACTIVE TEST .
- 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 Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .
NG → See step 8
OK → See step 5
- REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to REMOVAL
- INSPECT CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING
- INSPECT MULTIPLEX COMMUNICATION SYSTEM. Refer to DIAGNOSTIC TROUBLE CODE CHART
- REPLACE COMBINATION METER ASSEMBLY. Refer to REMOVAL