Lexus ES: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
- Use the following procedure to troubleshoot the lane control system.
- *: Use the Techstream.
PROCEDURE
| 1. | VEHICLE BROUGHT TO WORKSHOP |
|
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| 2. | PRE-CHECK |
(a) Measure the auxiliary battery voltage with the power switch off.
Standard Voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary 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.
|
| 3. | CHECK CAN COMMUNICATION SYSTEM* |
(a) Using the Techstream, check if the CAN communication system is functioning normally.
HINT:
Refer to CAN Bus Check in CAN Communication System.
Click here .gif)
OK:
CAN communication system is functioning normally.
| NG | .gif) | GO TO CAN COMMUNICATION SYSTEM |
|
| 4. | CHECK FOR DTCs* |
(a) Using the Techstream, Check for DTCs.
Chassis > Lane Control > Trouble Codes(b) Make a note of the output DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B | | GO TO STEP 6 |
|
| 5. | CHECK VEHICLE CONTROL HISTORY* |
(a) Using the Techstream, check for vehicle control history (RoB).
Chassis > Lane Control > 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 |
| B | | GO TO STEP 7 |
| 6. | RECONFIRM DTC OUTPUT* |
(a) Using the Techstream, Clear the DTCs.
Chassis > Lane Control > 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.
Chassis > Lane Control > Trouble Codes| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| A | | GO TO STEP 5 |
| B | | GO TO DTC CHART |
| 7. | RECONFIRM VEHICLE CONTROL HISTORY* |
(a) Using the Techstream, clear the vehicle control history (RoB).
Chassis > Lane Control > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
(b) Using the Techstream, check for vehicle control history (RoB).
Chassis > Lane Control > 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 |
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If CAN communication system and lane control system DTCs are not output and any of the following problem symptoms exist, perform troubleshooting by checking the appropr
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DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the Techstream once the inspection has been completed.
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