Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Road Test
ROAD TEST
HINT:
- The dynamic radar cruise control system has 2 cruise control modes: constant speed control mode and vehicle-to-vehicle distance control mode.
- Vehicle-to-vehicle distance control mode is selected by default when the dynamic radar cruise control system is turned on using the cruise control main switch.
PROBLEM SYMPTOM CONFIRMATION (CONSTANT SPEED CONTROL MODE)
(a) Inspect the SET function.
| *a | ON-OFF |
(1) Push and hold the cruise control main switch (ON-OFF) for 1.5 seconds or more with the dynamic radar cruise control system off to change to constant speed control mode.
(2) Check that the cruise control indicator (vehicle-to-vehicle distance control mode) turns off and the cruise control indicator (constant speed control mode) illuminates.
| *a | Cruise Control Indicator (Vehicle-to-vehicle Distance Control Mode) |
| *b | Cruise Control Indicator (Constant Speed Control Mode) |
(3) Drive at a speed between approximately 30 km/h (20 mph) and 200 km/h (125 mph).
(4) Push the cruise control main switch to -SET.
| *a | -SET |
(5) Check that the cruise SET indicator illuminates at this time.
| *a | Cruise Control Indicator |
| *b | Cruise SET Indicator |
(6) After releasing the switch, check that the vehicle maintains the set speed.
HINT:
If the vehicle speed decreases to 16 km/h (10 mph) less than the vehicle set speed such as when driving on a steep slope, control of vehicle speed by the dynamic cruise control system is canceled.
(b) Inspect the + (ACCEL) function.
| *a | ON-OFF |
| *b | -SET |
(1) Push and hold the cruise control main switch (ON-OFF) for 1.5 seconds or more with the dynamic radar cruise control system off to change to constant speed control mode.
(2) Drive at a speed between approximately 30 km/h (20 mph) and 200 km/h (125 mph).
(3) Push the cruise control main switch to -SET.
(4) Check that vehicle speed increases while the cruise control main switch is pushed to +RES, and that the vehicle maintains the newly set speed when the switch is released.
| *a | +RES |
(5) Push the cruise control main switch to +RES and then release it immediately. Check that vehicle speed increases by approximately 1 km/h or 1 mph (tap-up control).
HINT:
If the difference between the set vehicle speed and actual vehicle speed is 5 km/h (3 mph) or more, tap-up control will not operate.
(6) Confirm that the set vehicle speed displayed on the multi-information display changes when the cruise control main switch is pushed to +RES.
(c) Inspect the - (COAST) function.
(1) Push and hold the cruise control main switch (ON-OFF) for 1.5 seconds or more with the dynamic radar cruise control system off to change to constant speed control mode.
| *a | ON-OFF |
| *b | -SET |
(2) Drive at a speed between approximately 30 km/h (20 mph) and 200 km/h (125 mph).
(3) Push the cruise control main switch to -SET.
(4) Check that vehicle speed decreases while the cruise control main switch is pushed to -SET, and the vehicle maintains the newly set speed when the switch is released.
| *a | -SET |
HINT:
If the vehicle speed decreases to approximately 30 km/h (20 mph), control of vehicle speed by the dynamic cruise control system is canceled.
(5) Push the cruise control main switch to -SET, and then release it immediately. Check that vehicle speed decreases by approximately 1 km/h or 1 mph (tap-down control).
HINT:
If the difference between the set vehicle speed and actual vehicle speed is 5 km/h (3 mph) or more and the cruise control main switch is pushed to -SET, the vehicle speed is stored as the set speed and the vehicle will be driven in constant speed control mode.
(6) Confirm that the set vehicle speed displayed on the multi-information display changes when the cruise control main switch is pushed to -SET.
(d) Inspect the CANCEL function.
| *a | ON-OFF |
| *b | -SET |
(1) Push and hold the cruise control main switch (ON-OFF) for 1.5 seconds or more with the dynamic radar cruise control system off to change to constant speed control mode.
(2) Drive at a speed between approximately 30 km/h (20 mph) and 200 km/h (125 mph).
(3) Push the cruise control main switch to -SET.
(4) When any of the following are performed, check that control of vehicle speed by the dynamic radar cruise control system is canceled and that normal driving resumes (no control of vehicle speed by the dynamic radar cruise control system).
| *a | CANCEL |
- Depressing the brake pedal.
- Moving the shift lever from D or M to any other position.
- Selecting the D3, D2 or D1 range using the transmission shift switch assembly (shift paddle switch) with the shift lever in D.
- Pulling the cruise control main switch to CANCEL.
- Turning the dynamic radar cruise control system off using the cruise control main switch (ON-OFF) (the stored vehicle speed in the ECM is not maintained).
(e) Inspect the RES (RESUME) function.
HINT:
If the vehicle speed decreases to less than approximately 30 km/h (20 mph), pushing the cruise control main switch to +RES reinstates the set vehicle speed that was set before control of vehicle speed by the dynamic cruise control system was canceled.
| *a | ON-OFF |
| *b | -SET |
(1) Push and hold the cruise control main switch (ON-OFF) for 1.5 seconds or more with the dynamic radar cruise control system off to change to constant speed control mode.
(2) Drive at a speed between approximately 30 km/h (20 mph) and 200 km/h (125 mph).
(3) Push the cruise control main switch to -SET.
(4) Depress the brake pedal to cancel control of vehicle speed by the dynamic cruise control system.
| *a | +RES |
(5) Push the cruise control main switch to +RES while driving the vehicle at a speed of more than approximately 30 km/h (20 mph), and check that the vehicle resumes the speed set prior to cancellation, the set vehicle speed is displayed on the multi-information display and the cruise SET indicator illuminates.
PROBLEM SYMPTOM CONFIRMATION (VEHICLE-TO-VEHICLE DISTANCE CONTROL MODE)
(a) Inspect the SET function.
| *a | ON-OFF |
| *b | -SET |
(1) Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF).
(2) Check that the cruise control indicator illuminates in the combination meter assembly.
(3) Drive at a speed between approximately 30 km/h (20 mph) and 180 km/h (110 mph).
(4) Push the cruise control main switch to -SET.
(5) Check that the cruise control indicator remains illuminated, the cruise SET indicator illuminates in the combination meter assembly and the set speed is displayed on the multi-information display.
| *a | Cruise Control Indicator (Vehicle-to-vehicle Distance Control Mode) |
| *b | Cruise SET Indicator |
(6) After releasing the switch, check that the vehicle maintains the set speed.
(b) Inspect the + (ACCEL) function.
| *a | ON-OFF |
| *b | -SET |
(1) Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF).
(2) Drive at a speed between approximately 30 km/h (20 mph) and 180 km/h (110 mph).
(3) Push the cruise control main switch to -SET.
| *a | +RES |
(4) Push and hold the cruise control main switch to +RES and check that vehicle speed increases in 5 km/h or 5 mph increments.
(5) Push the cruise control main switch to +RES and then release it immediately. Check that the vehicle speed increases by approximately 5 km/h or 5 mph (tap-up control).
(6) Confirm that the set vehicle speed displayed on the multi-information display changes when the cruise control main switch is pushed to +RES.
(c) Inspect the - (COAST) function.
| *a | ON-OFF |
| *b | -SET |
(1) Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF).
(2) Drive at a speed between approximately 30 km/h (20 mph) and 180 km/h (110 mph).
(3) Push the cruise control main switch to -SET.
| *a | -SET |
(4) Push and hold the cruise control main switch to -SET and check that vehicle speed decreases in 5 km/h or 5 mph increments.
(5) Push the cruise control main switch to -SET, and then release it immediately. Check that the vehicle speed decreases by approximately 5 km/h or 5 mph (tap-down control).
(6) Confirm that the set vehicle speed displayed on the multi-information display changes when the cruise control main switch is pushed to -SET.
(d) Inspect the CANCEL function.
| *a | ON-OFF |
| *b | -SET |
(1) Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF).
(2) Drive at a speed between approximately 30 km/h (20 mph) and 180 km/h (110 mph).
(3) Push the cruise control main switch to -SET.
(4) When any of the following are performed, check that control of vehicle speed by the dynamic radar cruise control system is canceled and that normal driving resumes (no control of vehicle speed by the dynamic radar cruise control system).
-
Depressing the brake pedal.
HINT:
When the vehicle is stopped, control of vehicle speed by the dynamic radar cruise control system will not be canceled when the brake pedal is depressed.
- Moving the shift lever from D or M to any other position.
- Selecting the D3, D2 or D1 range using the transmission shift switch assembly (shift paddle switch) with the shift lever in D.
- Pulling the cruise control main switch to CANCEL.
- Turning the dynamic radar cruise control system off using the cruise control main switch (ON-OFF) (the stored vehicle speed in the ECM is not maintained).
| *a | CANCEL |
(e) Inspect the RES (RESUME) function.
HINT:
If the vehicle speed decreases to less than approximately 30 km/h (20 mph), pushing the cruise control main switch to +RES reinstates the set vehicle speed that was set before control of vehicle speed by the dynamic cruise control system was canceled.
| *a | ON-OFF |
| *b | -SET |
(1) Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF).
(2) Drive at a speed between approximately 30 km/h (20 mph) and 180 km/h (110 mph).
(3) Push the cruise control main switch to -SET.
(4) Depress the brake pedal to cancel control of vehicle speed by the dynamic cruise control system.
| *a | +RES |
(5) Push the cruise control main switch to +RES while driving the vehicle at a speed of more than approximately 0 km/h (0 mph), and check that the vehicle resumes the speed set prior to cancellation, the set vehicle speed is displayed on the multi-information display and the cruise SET indicator illuminates.
CHECK FULL-SPEED RANGE FOLLOWING FUNCTION
(a) Check the SET function.
| *a | ON-OFF |
| *b | -SET |
(1) Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF).
(2) Drive at a speed between approximately 0 km/h (0 mph) and 180 km/h (110 mph).
(3) Check that there is a preceding vehicle that can be tracked.
HINT:
Tracking control may not track the preceding vehicle under the following conditions:
- The rear of the preceding vehicle is small, such as an empty trailer or motorcycle.
| *a | -SET |
(4) Push the cruise control main switch to -SET.
(5) Check that tracking control starts to track the preceding vehicle within the specified speed range when the cruise control main switch is released.
(6) Check that the set vehicle speed is displayed on the multi-information display in the combination meter assembly.
(b) Check the deceleration function.
(1) When the preceding vehicle decelerates, check that the vehicle automatically decelerates while maintaining the set vehicle-to-vehicle distance.
(2) When the vehicle stops, check that "Waiting" is displayed on the multi-information display in the combination meter assembly.
HINT:
When "Waiting" is displayed on the multi-information display in the combination meter assembly, even if the brake pedal is depressed, tracking control is not canceled.
(c) Check the acceleration function.
(1) When the preceding vehicle starts off, check that "Push Cruise Control Switch or Press Accelerator to Resume" is displayed on the multi-information display in the combination meter assembly.
(2) Check that tracking control resumes tracking of the preceding vehicle when the cruise control main switch is pushed to +RES or the accelerator pedal is depressed.
| *a | +RES |
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Before performing troubleshooting for the dynamic radar cruise control system, perform troubleshooting for the pre-collision system.
Click here
*: Use the Techstre ...
Operation Check
OPERATION CHECK INPUT SIGNAL CHECK (a) Connect the Techstream to the DLC3. (b) Check the cruise control main switch using the Data List function of the Techstream (ON-OFF, -SET, +RES and CANCEL). ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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