Lexus ES: Rear Right Sensor Malfunction (C1AE9)
DESCRIPTION
The rear corner ultrasonic sensor RH is installed to the rear bumper. The clearance warning ECU assembly detects obstacles based on signals received from the rear corner ultrasonic sensor RH. If the rear corner ultrasonic sensor RH has an open circuit or other malfunction, it will not function normally.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1AE9 | Rear Right Sensor Malfunction | A malfunction of the rear corner ultrasonic sensor RH. |
|
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 C1AE9 is output | A |
| DTC C1AE9 and C1AED are output | B |
| No DTCs are output | C |
| B |  | GO TO DTC (C1AED) |
| C | | USE SIMULATION METHOD TO CHECK |
|
| 2. | REPLACE REAR CORNER ULTRASONIC SENSOR RH |
(a) Replace the rear corner ultrasonic sensor RH 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 C1AE9 is output | A |
| No DTCs are output | B |
| A | | REPLACE CLEARANCE WARNING ECU ASSEMBLY |
| B | | END (REAR RIGHT CORNER SENSOR WAS DEFECTIVE) |
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Installation
INSTALLATION CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE 1. INSTALL PARKING BRAKE ACTUATOR ASSEMBLY (a) Apply a light coat of lithium soap base glycol grease to a new O-ring. (b) Install the O-ring to
