Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Test Mode Procedure

TEST MODE PROCEDURE

ACTIVATE DEALER MODE (SIGNAL CHECK)

HINT:

  • Signals related to the vehicle stability control 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.
  • 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.
  • When entering Dealer Mode (Signal Check), the skid control ECU 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).

(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) 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) Lost Booster Pressure Judgment Check and Master Cylinder Pressure Sensor Zero Point Calibration

(1) Depress the brake pedal several times to release vacuum from the brake booster assembly with the engine stopped.

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

(3) 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.)

(4) 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.

(5) Check that the brake warning light goes off when quickly releasing the brake pedal. (The lost booster pressure state is judged to be normal.)

(6) Leave the vehicle for 1 second or more. (Master cylinder pressure sensor zero point calibration)

NOTICE:

  • If the brake pedal is depressed slowly or repeatedly, the master cylinder pressure sensor zero point calibration will not complete 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.

HINT:

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.

(d) Master Cylinder Pressure Sensor Check

(1) With the vehicle stopped, release the brake pedal for 1 second or more and check that value of Dealer Mode (Signal Check) Data List item Output Master Cylinder Pressure Sensor changes from incomplete to complete.

HINT:

  • The status of the ABS warning light and slip indicator light will not change.
  • If the master cylinder pressure sensor is normal and the above step is performed when in Dealer Mode (Signal Check), the master cylinder pressure sensor check will complete normally.

(e) Speed Sensor Check

NOTICE:

Before performing the speed sensor signal check, complete the master cylinder pressure 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 and 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 (Signal Check) pattern (blinking at 0.25 seconds intervals) when the vehicle is stopped.

(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 Dealer Mode (Signal Check) is started with the Techstream and all items display complete, the sensor check ends.
  • 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 a DTC is detected in Dealer Mode (Signal Check), the ABS warning light or slip indicator light illuminates.
  • 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 and enter normal mode.

(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, evaluate the gap between the sensor and rotor

  • Open or short in speed sensor
  • Open or short in sensor system wire harness
  • Defective connector contact or increased terminal resistance
  • Speed sensor installation defect
  • Front speed sensor rotor RH (front axle hub sub-assembly RH) malfunction

Output Signal of Front Speed Sensor LH

Incomplete/complete

Check for foreign matter, evaluate the gap between the sensor and rotor

  • Open or short in speed sensor
  • Open or short in sensor system wire harness
  • Defective connector contact or increased terminal resistance
  • Speed sensor installation defect
  • Front speed sensor rotor LH (front axle hub sub-assembly LH) malfunction

Output Signal of Rear Speed Sensor RH

Incomplete/complete

Check for foreign matter, evaluate the gap between the sensor and rotor

  • Open or short in speed sensor
  • Open or short in sensor system wire harness
  • Defective connector contact or increased terminal resistance
  • Speed sensor installation defect
  • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH) malfunction

Output Signal of Rear Speed Sensor LH

Incomplete/complete

Check for foreign matter, evaluate the gap between the sensor and rotor

  • Open or short in speed sensor
  • Open or short in sensor system wire harness
  • Defective connector contact or increased terminal resistance
  • Speed sensor installation defect
  • Rear speed sensor rotor LH (rear axle hub and bearing assembly LH) malfunction

Change in Output Signal of Front Speed Sensor RH

Incomplete/complete

  • Evaluate the stability of the sensor input waveform
  • Evaluate the straight ahead / reverse signal inputs
  • Foreign object attached to speed sensor
  • Front speed sensor rotor RH (front axle hub sub-assembly RH) malfunction

Change in Output Signal of Front Speed Sensor LH

Incomplete/complete

  • Evaluate the stability of the sensor input waveform
  • Evaluate the straight ahead / reverse signal inputs
  • Foreign object attached to speed sensor
  • Front speed sensor rotor LH (front axle hub sub-assembly LH) malfunction

Change in Output Signal of Rear Speed Sensor RH

Incomplete/complete

  • Evaluate the stability of the sensor input waveform
  • Evaluate the straight ahead / reverse signal inputs
  • Foreign object attached to speed sensor
  • Rear speed sensor rotor RH (rear axle hub and bearing assembly RH) malfunction

Change in Output Signal of Rear Speed Sensor LH

Incomplete/complete

  • Evaluate the stability of the sensor input waveform
  • Evaluate the straight ahead / reverse signal inputs
  • Foreign object attached to speed sensor
  • Rear speed sensor rotor LH (rear axle hub and bearing assembly LH) malfunction

Output Master Cylinder Pressure Sensor

Incomplete/complete

Evaluate the master cylinder pressure sensor zero point voltage

  • Open circuit or short in master cylinder pressure sensor circuit
  • Open or short in stop light switch assembly circuit or defective connector connection
  • Stop light switch assembly stuck OFF
  • Stop light switch assembly stuck ON

Judgment of Failure State

Incomplete/complete

Check that the brake pedal load sensing switch is normal

  • Open or short in brake pedal load sensing switch system wire harness
  • Brake pedal load sensing switch stuck ON/OFF
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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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