DTC C1AE1: Front Left Sensor Malfunction [06/2018 - 09/2022]: Procedure

WARNING: This page is about a different car, the 2022 Lexus ES 300h, 2021 Lexus ES 300h, 2020 Lexus ES 300h, and 2019 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC OUTPUT

Check for DTCs.

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

Result

Result	Proceed to
Only DTC C1AE1 is output	A
DTC C1AE1 and C1AEC are output	B
No DTCs are output	C

Result:

GO TO DTC (C1AEC). Refer to DTC C1AEC: Front Sensor Communication Malfunction [06/2018 - 09/2022]

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]

Result:

See step 2

REPLACE FRONT CORNER ULTRASONIC SENSOR LH

Replace the front corner ultrasonic sensor LH with new or a known good one.

Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022]

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.

Result

Proceed to
NEXT

Result:

See step 3

CHECK DTC OUTPUT

Clear the DTCs.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs

Check for DTCs.

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

Result

Result	Proceed to
DTC C1AE1 is output	A
No DTCs are output	B

Result:

REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022]

Result:

END (FRONT LEFT CONRNER SENSOR WAS DEFECTIVE)