WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK
When the ignition switch is turned to ON, check that the ABS warning, brake warning, VSC OFF indicator, slip indicator and downhill assist control indicator (for AWD) lights all come on for approximately 3 seconds.
Tech Tips
When the brake fluid level is low, the brake warning light comes on.
If the skid control ECU (brake actuator assembly) stores a DTC, the ABS warning and slip indicator lights will come on.
If any of the indicators remains on or does not come on, proceed to troubleshooting for the light circuits listed below.
Trouble Area | See Procedure |
---|---|
ABS warning light circuit (Remains on) | |
ABS warning light circuit (Does not come on) | |
Brake warning light circuit (Remains on) | |
Brake warning light circuit (Does not come on) | |
VSC OFF indicator light circuit (Remains on) | |
VSC OFF indicator light circuit (Does not come on) | |
Slip indicator light circuit (Remains on) | |
Slip indicator light circuit (Does not come on) | |
Downhill assist control indicator light circuit (Remains on)* | |
Downhill assist control indicator light circuit (Does not come on)* |
*: for AWD
Tech Tips
VSC does not operate in Test Mode (signal check), regardless of whether the sensor check is normal or abnormal.
When a malfunction occurs in an ABS system sensor, the ABS warning light illuminates.
When a malfunction occurs in a VSC system sensor, the slip indicator light illuminates.
SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using GTS)
Procedure to enter Test Mode
Turn the ignition switch off.
Check that the steering wheel is centered.
Apply the parking brake.
Check that the shift lever is in P.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Switch the skid control ECU (brake actuator assembly) to Test Mode using the GTS. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.
Tester Display |
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Signal Check |
Check that the ABS warning and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.
Tech Tips
If the ABS warning and slip indicator lights do not blink, inspect the ABS warning and slip indicator light circuits.
Check the ABS sensors.
Tech Tips
Check that the ABS warning light is blinking in the Test Mode pattern before performing the following ABS sensor checks.
Acceleration Sensor Check
Keep the vehicle stationary on a level surface for 1 second or more.
Tech Tips
The acceleration sensor check can be performed by following the master cylinder pressure sensor check procedure below.
Lost Booster Pressure Judgment Check and Master Cylinder Pressure Sensor Zero Point Calibration
Depress the brake pedal several times to release vacuum from the brake booster assembly with the engine stopped.
Turn the ignition switch to ON.
Check that the brake warning light comes on when depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more. (The lost booster pressure state is judged to be normal.)
Start the engine while depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more.
Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged to be normal.)
Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
Note
If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally.
If the lost booster pressure judgment check results are not normal, then the master cylinder pressure sensor check cannot be performed.
If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking.
Tech Tips
If the lost booster pressure state is not judged to be normal, the brake warning light comes on and Test Mode (signal check) inspection item (Output Master Cylinder Pressure Sensor) is displayed.
Master Cylinder Pressure Sensor Check
Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) for 1 second.
Check that the ABS warning light stays on for 3 seconds.
Tech Tips
Confirm that the ABS warning light comes on.
While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) or more.
The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
Speed Sensor Check
Drive the vehicle straight-ahead.
Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds.
Note
The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels.
After the ABS warning light goes off, if vehicle speed exceeds 80 km/h (50 mph), a sensor check code will be stored again. Decelerate or stop the vehicle before the speed reaches 80 km/h (50 mph).
Tech Tips
The sensor check may not complete if wheelspin occurs.
The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
Check that the ABS warning light goes off.
Tech Tips
The ABS warning light goes off when the sensor check has completed.
The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.
Stop the vehicle.
Note
If the sensor check has not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate.
Tech Tips
When the sensor check has completed, the ABS warning light goes off while the vehicle is being driven, and blinks in the Test Mode pattern while the vehicle is stopped.
VSC Sensor Check
Tech Tips
Check that the slip indicator light is blinking in the Test Mode pattern before performing the following VSC sensor check.
VSC OFF Switch Check
Press the VSC OFF switch.
Check that the VSC OFF indicator light comes on.
Press the VSC OFF switch again.
Downhill Assist Control Switch Check (for AWD)
Press the downhill assist control switch.
Check that the downhill assist control indicator light blinks.
Press the downhill assist control switch again.
End of Sensor Check
If the sensor check is completed, the ABS warning light and slip indicator light blink (Test Mode (signal check)) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.
Note
When Test Mode (signal check) is started with the GTS and all items display complete, the sensor check ends.
If the sensor check is not complete, the ABS warning light blinks when the vehicle is in motion and the ABS does not operate.
End of Test Mode (Signal Check)
End Test Mode (signal check) using the GTS
Turn the ignition switch off and enter normal mode.
Remove the GTS.
SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using SST Check Wire)
Tech Tips
VSC does not operate in Test Mode (signal check), regardless of whether the sensor check is normal or abnormal.
When a malfunction occurs in an ABS system sensor, the ABS warning light illuminates.
When a malfunction occurs in a VSC system sensor, the slip indicator light illuminates.
Procedure to enter Test Mode
Turn the ignition switch off.
Check that the steering wheel is centered.
Apply the parking brake.
Check that the shift lever is in P.
*a | Front view of DLC3 |
Using SST, connect terminals TS and CG of the DLC3.
Turn the ignition switch to ON.
Check that the ABS warning and slip indicator lights come on for several seconds and then blink in the Test Mode pattern.
Tech Tips
If the ABS warning and slip indicator lights do not blink, inspect the TS and CG terminal circuit and ABS warning and slip indicator light circuits.
Check the ABS sensors.
Tech Tips
Check that the ABS warning light is blinking in the Test Mode pattern before performing the following ABS sensor checks.
Acceleration Sensor Check
Keep the vehicle stationary on a level surface for 1 second or more.
Tech Tips
The acceleration sensor check can be performed by following the master cylinder pressure sensor check procedure below.
Lost Booster Pressure Judgment Check and Master Cylinder Pressure Sensor Zero Point Calibration
Depress the brake pedal several times to release vacuum from the brake booster assembly with the engine stopped.
Turn the ignition switch to ON.
Check that the brake warning light comes on when depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more. (The lost booster pressure state is judged to be normal.)
Start the engine while depressing the brake pedal with a force of 59.0 N (6.0 kgf, 13.2 lbf) or more for 1 second or more.
Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged to be normal.)
Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)
Note
If depressing the brake pedal slowly or repeatedly, the master cylinder pressure sensor zero point calibration is not performed normally.
If the lost booster pressure judgment check results are not normal, then the master cylinder pressure sensor check cannot be performed.
If rechecking after the engine has started, end Test Mode, enter Test Mode again, and release vacuum in the booster by pumping the brake pedal prior to rechecking.
Master Cylinder Pressure Sensor Check
Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force greater than 98 N (10 kgf, 22.0 lbf) for 1 second.
Check that the ABS warning light stays on for 3 seconds.
Tech Tips
Confirm that the ABS warning light comes on.
While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf, 22.0 lbf) or more.
The ABS warning light comes on for 3 seconds every time the preceding brake pedal operation is performed.
Speed Sensor Check
Drive the vehicle straight-ahead.
Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds.
Note
The speed sensor check may not complete if the speed sensor check is started while turning the steering wheel or spinning the wheels.
Tech Tips
The sensor check may not complete if wheelspin occurs.
The ABS warning light comes on immediately if a malfunction is detected during the speed sensor check.
Check that the ABS warning light goes off.
Tech Tips
The ABS warning light goes off when the sensor check has completed.
The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.
Stop the vehicle.
Note
If the sensor check has not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate.
Tech Tips
When the sensor check has completed, the ABS warning light goes off while the vehicle is being driven, and blinks in the Test Mode pattern while the vehicle is stopped.
VSC Sensor Check
Tech Tips
Check that the slip indicator light is blinking in the Test Mode pattern before performing the following VSC sensor check.
VSC OFF Switch Check
Press the VSC OFF switch.
Check that the VSC OFF indicator light comes on.
Press the VSC OFF switch again.
Downhill Assist Control Switch Check (for AWD)
Press the downhill assist control switch.
Check that the downhill assist control indicator light blinks.
Press the downhill assist control switch again.
End of Sensor Check
If the sensor checks have completed, the ABS warning light blinks in the Test Mode pattern when the vehicle is stopped and the ABS warning light goes off while the vehicle is being driven.
Note
If the sensor checks have not completed, the ABS warning light will blink while the vehicle is being driven and the ABS will not operate.