Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
-
Before performing troubleshooting for the road sign assist system, make sure that the pre-collision system and lane control system are not malfunctioning.
Pre-collision system: Click here
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Lane control system: Click here
- Perform the following procedure to troubleshoot the road sign assist system.
- *: Use the Techstream.
PROCEDURE
| 1. | VEHICLE BROUGHT TO WORKSHOP |
|
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| 2. | CUSTOMER PROBLEM ANALYSIS |
HINT:
- In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
- Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
-
The following 5 items are important points for problem analysis:
What
Vehicle model, system name
When
Date, time, occurrence frequency
Where
Road conditions
Under what conditions?
Driving conditions, weather conditions
How did it happen?
Problem symptoms
|
| 3. | PRE-CHECK |
(a) Measure the battery voltage.
Standard Voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
(b) Check the fuses and relays.
(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.
|
| 4. | CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* |
(a) Using the Techstream, check for CAN communication system DTCs.
Click here
| Result | Proceed to |
|---|---|
| CAN DTCs are not output | A |
| CAN DTCs are output | B |
| B | .gif) | GO TO CAN COMMUNICATION SYSTEM |
|
| 5. | CHECK FOR DTCs* |
(a) Using the Techstream, Check for DTCs.
Body Electrical > Road Sign Assist > Trouble Codes(b) Make a note of the output DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| A | | GO TO STEP 7 |
|
| 6. | RECONFIRM DTC OUTPUT* |
(a) Using the Techstream, Clear the DTCs.
Body Electrical > Road Sign Assist > Clear DTCs(b) Reproduce the vehicle conditions that were present when the DTCs that were noted were stored.
HINT:
Refer to each corresponding DTC for details on the detection conditions.
Click here
(c) Using the Techstream, check for DTCs.
Body Electrical > Road Sign Assist > Trouble Codes| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 7. | CHECK VEHICLE CONTROL HISTORY* |
(a) Using the Techstream, check for Vehicle Control History (RoB).
Body Electrical > Road Sign Assist > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
(b) Make a note of the output Vehicle Control History (RoB).
| Result | Proceed to |
|---|---|
| Vehicle Control History (RoB) is not output | A |
| Vehicle Control History (RoB) is output | B |
| A | | GO TO SYMPTOM SIMULATION |
|
| 8. | RECONFIRM VEHICLE CONTROL HISTORY* |
(a) Using the Techstream, clear the Vehicle Control History (RoB).
Body Electrical > Road Sign Assist > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
(b) Using the Techstream, check for Vehicle Control History (RoB).
Body Electrical > Road Sign Assist > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
| Result | Proceed to |
|---|---|
| Vehicle Control History (RoB) is not output | A |
| Vehicle Control History (RoB) is output | B |
| A | | GO TO SYMPTOM SIMULATION |
| B | | GO TO VEHICLE CONTROL HISTORY |
Parts Location
PARTS LOCATION ILLUSTRATION *1 MILLIMETER WAVE RADAR SENSOR ASSEMBLY *2 FORWARD RECOGNITION CAMERA *3 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) *4 ECM ILLUSTRATION *A for ...
Utility
UTILITY NOTICE: If the forward recognition camera has been replaced due to a malfunction in the road sign assist system, be sure to perform forward recognition camera adjustment. Otherwise all systems ...
Other materials:
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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