Lexus ES: Front Left Sensor Malfunction (C1AE1)
DESCRIPTION
The front corner ultrasonic sensor LH is installed to the front bumper. The clearance warning ECU assembly detects obstacles based on signals received from the front corner ultrasonic sensor LH. If the front corner ultrasonic sensor LH has an open circuit or other malfunction, it will not function normally.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1AE1 | Front Left Sensor Malfunction | A malfunction of the front corner ultrasonic sensor LH. |
|
CAUTION / NOTICE / HINT
NOTICE:
If DTCs are output after repairs, turn the engine switch on (IG) and the parking support alert system on. Then clear the DTCs.
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PROCEDURE
| 1. | CHECK DTC OUTPUT |
(a) Check for DTCs.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes| Result | Proceed to |
|---|---|
| Only DTC C1AE1 is output | A |
| DTC C1AE1 and C1AEC are output | B |
| No DTCs are output | C |
| B |  | GO TO DTC (C1AEC) |
| C | | USE SIMULATION METHOD TO CHECK |
|
| 2. | REPLACE FRONT CORNER ULTRASONIC SENSOR LH |
(a) Replace the front corner ultrasonic sensor LH with new or a known good one.
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HINT:
All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.
|
| 3. | CHECK DTC OUTPUT |
(a) Clear the DTCs.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs(b) Check for DTCs.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes| Result | Proceed to |
|---|---|
| DTC C1AE1 is output | A |
| No DTCs are output | B |
| A | | REPLACE CLEARANCE WARNING ECU ASSEMBLY |
| B | | END (FRONT LEFT CONRNER SENSOR WAS DEFECTIVE) |
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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 probability in the "Suspected Area" column of the table. Check each symptom by checking the suspect
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