Lexus ES manuals

Lexus ES: Test Mode Procedure

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Gasoline Model) / Test Mode Procedure

TEST MODE PROCEDURE

NOTICE:

  • After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.
  • After replacing or removing and installing a speed sensor rotor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.

SENSOR CHECK USING DEALER MODE (SIGNAL CHECK)

HINT:

  • Signals related to the electronically controlled brake system can be inspected by performing a Dealer Mode (Signal Check) inspection. During the inspection, the display of items determined normal by the skid control ECU (brake actuator assembly) changes from incomplete to complete.
  • During Dealer Mode (Signal Check), the VSC system does not operate regardless of whether the system is normal or a malfunction is detected.
  • If a sensor is malfunctioning, ABS does not operate and the ABS warning and slip indicator lights illuminate.
  • When entering Dealer Mode (Signal Check), the skid control ECU (brake actuator assembly) communicates with the forward recognition camera to judge whether the vehicle is equipped with the pre-collision system. Therefore, do not exit Dealer Mode (Signal Check) within 5 seconds of entering Dealer Mode (Signal Check).
  • Even during Dealer Mode (Signal Check), if there is a system malfunction that causes brake hold control to be prohibited, when the vehicle is under the following conditions and the brake hold switch (No. 3 combination switch assembly) is turned on, the brake hold operated indicator light blinks.
    • Vehicle Conditions:
      1. The driver door is closed.
      2. The driver seat belt is fastened.

(a) Procedure to enter Dealer Mode (Signal Check)

(1) Turn the engine switch off.

(2) Apply the parking brake.

(3) Check that the shift lever is in P.

(4) Connect the Techstream to the DLC3.

(5) Turn the engine switch on (IG).

(6) Check that the steering wheel is centered.

(7) Turn the Techstream on.

(8) Switch the skid control ECU (brake actuator assembly) to Dealer Mode (Signal Check) using the Techstream. Enter the following menus: Chassis / Brake/EPB / Utility / Signal Check.

Chassis > Brake/EPB > Utility

Tester Display

Signal Check

HINT:

Do not exit Dealer Mode (Signal Check) within 5 seconds of entering Dealer Mode (Signal Check). If Dealer Mode (Signal Check) is exited within 5 seconds of entering Dealer Mode (Signal Check), DTC U023A87 may be stored. If DTC U023A87 is output after exiting Dealer Mode (Signal Check), enter Dealer Mode (Signal Check) again, wait at least 5 seconds, then recheck for DTCs.

(b) Confirm the system has entered Dealer Mode (Signal Check).

(1) Confirm that the ABS warning light and slip indicator light indicate the Dealer Mode pattern (blinking at 0.25 seconds intervals).

HINT:

  • If the ABS warning light or slip indicator light remains illuminated or does not illuminate when Dealer Mode (Signal Check) is entered, a component or wire harness may be malfunctioning.
  • When entering Dealer Mode (Signal Check), if the parking brake is engaged, the parking brake indicator light (red) will illuminate, and if the parking brake is not engaged, the parking brake indicator light (red) will blink in the Dealer Mode pattern (blinking at 0.25 seconds intervals).

(c) Speed Sensor Check

(1) Start the engine.

(2) Drive the vehicle straight-ahead.

Accelerate the vehicle to a speed of 45 km/h (28 mph) or more for several seconds.

(3) Check that the ABS warning light goes off.

NOTICE:

  • If the sensor check does not complete successfully or a malfunctioning sensor is detected, the ABS warning light indicates the Dealer Mode pattern (blinking at 0.25 seconds intervals) and the ABS system will not operate.
  • If the vehicle is driven at 80 km/h (50 mph) or more after the ABS warning lamp turns off, the speed sensor check will be performed again. In this situation, the ABS warning lamp will start blinking again.
  • The speed sensor check may not complete if the sensor check is started with the steering wheel turned or one or more wheels spinning.

HINT:

If the sensor check completes successfully, the ABS warning light turns off when the vehicle is being driven, and indicates the Dealer Mode pattern (blinking at 0.25 seconds intervals) when the vehicle is stopped.

(4) Stop the vehicle.

(d) VSC OFF Switch Check

(1) Press the VSC OFF switch.

(2) Check that the VSC OFF indicator light comes on.

(3) Press the VSC OFF switch again.

(4) Check that the VSC OFF indicator light turns off.

(e) Brake Hold Switch (No. 3 Combination Switch Assembly) Check

HINT:

Perform the check with the system in a normal condition.

(1) Make sure the following conditions are met:

  • The driver door is closed.
  • The driver seat belt is fastened.

(2) Press the brake hold switch (No. 3 combination switch assembly).

(3) Check that the brake hold standby indicator light comes on.

(4) Press the brake hold switch (No. 3 combination switch assembly) again.

(5) Check that the brake hold standby indicator light turns off.

(f) End of Sensor Check

(1) If the sensor check completes successfully, the ABS warning light turns off when the vehicle is being driven, and indicates the Dealer Mode pattern (blinking at 0.25 seconds intervals) when the vehicle is stopped.

NOTICE:

  • When the all Dealer Mode (Signal Check) Inspection Items are complete, the sensor check is complete.
  • If the sensor checks have not completed, the ABS warning light will remain blinking while the vehicle is being driven, and the ABS will not operate.
  • If any malfunctions are detected during Dealer Mode (Signal Check), the ABS warning light or slip indicator light remains illuminated.
  • If any DTCs are output or if Dealer Mode (Signal Check) items do not complete even after repeated attempts, repair or replace the malfunctioning part.

(g) End of Dealer Mode (Signal Check)

(1) Turn the engine switch off.

(2) Disconnect the Techstream.

(h) Dealer Mode (Signal Check) Inspection Item Chart

Item Name

Range

Judgment Description

Trouble Area

Output Signal of Front Speed Sensor RH

Incomplete / complete
  • Check for foreign matter
  • Check the gap between the sensor and rotor
  • Open or short in speed sensor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Sensor installation
  • Front speed sensor rotor RH (front axle hub sub-assembly RH)

Output Signal of Front Speed Sensor LH

Incomplete / complete
  • Check for foreign matter
  • Check the gap between the sensor and rotor
  • Open or short in speed sensor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Sensor installation
  • Front speed sensor rotor LH (front axle hub sub-assembly LH)

Output Signal of Rear Speed Sensor RH

Incomplete / complete
  • Check for foreign matter
  • Check the gap between the sensor and rotor
  • Open or short in speed sensor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Sensor installation
  • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)

Output Signal of Rear Speed Sensor LH

Incomplete / complete
  • Check for foreign matter
  • Check the gap between the sensor and rotor
  • Open or short in speed sensor
  • Open or short in wire harness
  • Improperly connected connector, deformation or corrosion of terminals
  • Sensor installation
  • Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)

Change in Output Signal of Front Speed Sensor RH

Incomplete / complete

Check the stability of the sensor output waveform
  • Front speed sensor RH
  • Front speed sensor rotor RH (front axle hub sub-assembly RH)

Change in Output Signal of Front Speed Sensor LH

Incomplete / complete

Check the stability of the sensor output waveform
  • Front speed sensor LH
  • Front speed sensor rotor LH (front axle hub sub-assembly LH)

Change in Output Signal of Rear Speed Sensor RH

Incomplete / complete

Check the stability of the sensor output waveform
  • Rear speed sensor RH*1
  • Rear speed sensor RH (rear axle hub and bearing assembly RH)*2
  • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)

Change in Output Signal of Rear Speed Sensor LH

Incomplete / complete

Check the stability of the sensor output waveform
  • Rear speed sensor LH*1
  • Rear speed sensor LH (rear axle hub and bearing assembly LH)*2
  • Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)
  • *1: for AWD
  • *2: for 2WD

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