Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Brake Warning Light (Yellow) Remains On
DESCRIPTION
This procedure is for troubleshooting when the brake warning light (yellow) remains on but no DTCs are output.
The skid control ECU (brake actuator assembly) controls the brake warning light (yellow) in the combination meter assembly via CAN communication.
CAUTION / NOTICE / HINT
NOTICE:
- The electric parking brake may still operate up to 20 seconds after the engine switch is turned off. Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more.
-
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
Click here
.gif)
- When replacing the skid control ECU (brake actuator assembly), operate the electric parking brake switch (electric parking brake switch assembly) as the parking brake indicator light (red) blinks when the engine switch is first turned on (IG).
PROCEDURE
| 1. | CHECK VEHICLE CONTROL HISTORY (ELECTRIC PARKING BRAKE SYSTEM) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Chassis / Brake/EPB / Utility / Vehicle Control History (RoB).
(d) d. Using the Techstream, check for Vehicle Control History.
Click here
| Tester Display |
|---|
| Vehicle Control History (RoB) |
HINT:
If vehicle control history is stored when the electric parking brake system is suspended, the brake warning light (yellow) illuminates.
| Result | Proceed to |
|---|---|
| There is no vehicle control history for when the electric parking brake system was suspended. | A |
| There is vehicle control history for when the electric parking brake system was suspended. | B |
| B | .gif) | ERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY |
|
.gif)
| 2. | INSPECT COMBINATION METER ASSEMBLY (BRAKE WARNING LIGHT (YELLOW)) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(d) Perform the Active Test of the combination meter assembly using the Techstream.
Click here
| Tester Display |
|---|
| ECB Warning |
(e) Check the combination meter assembly.
OK:
The brake warning light (yellow) turns on or off in accordance with Techstream operation.
| OK | | REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
| NG | | INSPECT METER / GAUGE SYSTEM |
Message Not Displayed on Multi-information Display When AUTO Function Set to ON/OFF
DESCRIPTION When the AUTO function is set to ON/OFF, a message is displayed on the multi-information display in the combination meter assembly. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
The e ...
Electric Parking Brake System AUTO Function Circuit
DESCRIPTION The skid control ECU (brake actuator assembly) receives shift position signals from the ECM via CAN communication to control the electric parking brake system AUTO function (IG-OFF linked ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Seat Belt Warning System: Customize Parameters
CUSTOMIZE PARAMETERS CUSTOMIZE SEAT BELT WARNING SYSTEM NOTICE:
When the customer requests a change in a function, first make sure that the function can be customized.
Be sure to make a note of the current settings before customizing.
When troubleshooting a function, first make sure that the ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Smart Access System With Push-button Start (for Start Function): ACC Monitor Malfunction (B2274)
DESCRIPTION This DTC is stored when a malfunction in the ACC output circuit is detected. The ACC output circuit is the circuit between terminal ACCD of the certification ECU (smart key ECU assembly) and the ACC relay. DTC No. Detection Item DTC Detection Condition Trouble Area Note B2 ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
0.0147