Lexus ES: ABS Warning Light Remains ON
DESCRIPTION
This procedure is for troubleshooting when the ABS warning light remains on but no DTCs are output.
The skid control ECU (brake actuator assembly) controls the ABS warning light in the combination meter assembly via CAN communication.
CAUTION / NOTICE / HINT
NOTICE:
-
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
Click here
- Before performing this procedure, depress the brake pedal and confirm that the stop lights illuminate.
PROCEDURE
| 1. | CHECK VEHICLE CONTROL HISTORY (ELECTRONICALLY CONTROLLED BRAKE SYSTEM AND 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) 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 electronically controlled brake system and electric parking brake system are suspended, the ABS warning light illuminates.
| Result | Proceed to |
|---|---|
| There is no vehicle control history for when the electronically controlled brake system and electric parking brake system were suspended. | A |
| There is vehicle control history for when the electronically controlled brake system and/or electric parking brake system were suspended. | B |
| B |  | PERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY |
|
| 2. | INSPECT COMBINATION METER ASSEMBLY |
(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 |
|---|
| ABS Warning |
(e) Check the combination meter assembly.
OK:
The ABS warning light turns on or off in accordance with Techstream operation.
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | INSPECT METER / GAUGE SYSTEM |
READ NEXT:
Brake Actuator Operation Sound is Loud during Initial Check
CAUTION / NOTICE / HINT NOTICE: After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization. Click here
Brake Hold Operated Indicator Light Circuit
DESCRIPTION The brake hold operated indicator light illuminates when the brake hold system is operating (vehicle stopped due to brake fluid pressure hold) and turns off when the brake hold system oper
Brake Hold Standby Indicator Light Circuit
DESCRIPTION The brake hold standby indicator light turns on if brake hold control is possible when the following conditions required for operation standby are met and the brake hold switch (No. 3 comb
SEE MORE:
Rear Height Control Sensor (B241A)
DESCRIPTION The headlight ECU sub-assembly LH determines the vehicle height and performs automatic headlight beam level control based on signals from the rear height control sensor sub-assembly LH via direct line. DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
Fail-safe Chart
FAIL-SAFE CHART If any of the following DTCs are stored, the hybrid vehicle control ECU enters fail-safe mode to allow the vehicle to be driven temporarily. Charging System DTC No. Fail-safe Operation Fail-safe Deactivation Condition P058A01 P162B87 DC/DC converter command is fixed. C
