Lexus ES: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
-
Before performing troubleshooting for the front radar sensor system, perform troubleshooting for the pre-collision system.
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- *: Use the Techstream.
PROCEDURE
| 1. | VEHICLE BROUGHT TO WORKSHOP |
|
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| 2. | 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.
|
| 3. | CHECK CAN COMMUNICATION SYSTEM* |
(a) Using the Techstream, check that the CAN communication system is functioning normally.
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OK:
CAN communication system is functioning normally.
| NG | .gif) | GO TO CAN COMMUNICATION SYSTEM |
|
| 4. | CHECK FOR DTCs* |
(a) Check for DTCs.
Body Electrical > Front Radar Sensor > Trouble Codes(b) Make a note of any DTCs that are output.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTC C1A1100 is output | B |
| DTCs other than C1A1100 are output | C |
| B | | GO TO DTC CHART (C1A1100) |
| C | | GO TO STEP 7 |
|
| 5. | CHECK VEHICLE CONTROL HISTORY* |
(a) Using the Techstream, check for Vehicle Control History.
Body Electrical > Front Radar Sensor > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
(b) Record any output Vehicle Control History.
| Result | Proceed to |
|---|---|
| Vehicle Control History codes are not output | A |
| Vehicle Control History code X2026 or X2028 is output | B |
| Vehicle Control History codes other than X2026 and X2028 are output | C |
| A | | GO TO SYMPTOM SIMULATION |
| B | | GO TO VEHICLE CONTROL HISTORY (X2026 or X2028) |
|
| 6. | RECONFIRM VEHICLE CONTROL HISTORY* |
(a) Using the Techstream, clear the Vehicle Control History.
Body Electrical > Front Radar Sensor > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
(b) Using the Techstream, check for Vehicle Control History.
Body Electrical > Front Radar Sensor > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
| Result | Proceed to |
|---|---|
| Vehicle Control History codes are not output | A |
| Vehicle Control History codes are output | B |
| A | | GO TO SYMPTOM SIMULATION |
| B | | GO TO VEHICLE CONTROL HISTORY |
| 7. | RECONFIRM DTC OUTPUT* |
(a) Clear the DTCs.
Body Electrical > Front Radar Sensor > 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.
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(c) Recheck for DTCs.
Body Electrical > Front Radar Sensor > Trouble Codes| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| A | | GO TO STEP 5 |
| B | | GO TO DTC CHART |
READ NEXT:
Utility
UTILITY NOTICE:
When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of
Terminals Of Ecu
TERMINALS OF ECU NOTICE:
Turning the engine switch on (IG) with connectors disconnected may cause DTCs to be stored. Make sure to clear the DTCs after inspection has been performed.
Do not apply
SEE MORE:
Brake Warning Light Remains ON
DESCRIPTION This procedure is for troubleshooting when the brake warning light / red (malfunction) remains on but no DTCs are output. The skid control ECU (brake actuator assembly) controls the brake warning light / red (malfunction) in the combination meter assembly via CAN communication. WIRING DI
DC/DC Converter Stuck On (P0A949E,P0D3319)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC indicates that a large current flowed in the boost converter. The cause of this malfunction may be one of the following: Area Main Malfunction Description Hybrid vehicle transaxle assembly
Open or short circuit in the motor or generator coil
