Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Rear Sensor Communication Malfunction (C1AED)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Intuitive Parking Assist System (w/ Intelligent Clearance Sonar System) / Rear Sensor Communication Malfunction (C1AED)

DESCRIPTION

This DTC is stored when there is an open or short circuit in the communication line between the rear sensors and the ECU, or when there is a malfunction in a rear sensor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AED

Rear Sensor Communication Malfunction

An open or short circuit in the communication line between the rear sensors and ECU or a malfunction in a rear sensor during initialization mode after the engine switch is turned on (IG).
  • Rear ultrasonic sensor circuit
  • Harness or connector
  • Clearance warning ECU assembly

WIRING DIAGRAM

PROCEDURE

1.

INITIALIZE REAR CORNER ULTRASONIC SENSOR AND REAR CENTER ULTRASONIC SENSOR

(a) Initialize the rear corner ultrasonic sensor and rear center ultrasonic sensor.

Click here

NEXT

2.

CHECK DTC OUTPUT (C1AED)

(a) Check for DTCs.

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

(b) Clear the DTCs.

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

(c) Recheck for DTCs.

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

Result

Proceed to

DTC C1AED is output

A

No DTCs are output

B
B

USE SIMULATION METHOD TO CHECK

A

3.

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - REAR CORNER ULTRASONIC SENSOR RH)

(a) Disconnect the J38 clearance warning ECU assembly connector.

(b) Disconnect the Y5 rear corner ultrasonic sensor RH connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J38-22 (BOR) - Y5-4 (BI)

Always

Below 1 Ω

J38-24 (SOR) - Y5-5 (SI)

Always

Below 1 Ω

J38-23 (E1) - Y5-6 (EI)

Always

Below 1 Ω

J38-22 (BOR) or Y5-4 (BI) - Body ground

Always

10 kΩ or higher

J38-24 (SOR) or Y5-5 (SI) - Body ground

Always

10 kΩ or higher

J38-23 (E1) or Y5-6 (EI) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (REAR CORNER ULTRASONIC SENSOR RH - REAR CENTER ULTRASONIC SENSOR RH)

(a) Disconnect the Y6 rear center ultrasonic sensor RH connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Y5-1 (BO) - Y6-4 (BI)

Always

Below 1 Ω

Y5-2 (SO) - Y6-5 (SI)

Always

Below 1 Ω

Y5-3 (EO) - Y6-6 (EI)

Always

Below 1 Ω

Y5-1 (BO) or Y6-4 (BI) - Body ground

Always

10 kΩ or higher

Y5-2 (SO) or Y6-5 (SI) - Body ground

Always

10 kΩ or higher

Y5-3 (EO) or Y6-6 (EI) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (REAR CENTER ULTRASONIC SENSOR RH - REAR CENTER ULTRASONIC SENSOR LH)

(a) Disconnect the Y7 rear center ultrasonic sensor LH connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Y6-1 (BO) - Y7-4 (BI)

Always

Below 1 Ω

Y6-2 (SO) - Y7-5 (SI)

Always

Below 1 Ω

Y6-3 (EO) - Y7-6 (EI)

Always

Below 1 Ω

Y6-1 (BO) or Y7-4 (BI) - Body ground

Always

10 kΩ or higher

Y6-2 (SO) or Y7-5 (SI) - Body ground

Always

10 kΩ or higher

Y6-3 (EO) or Y7-6 (EI) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (REAR CENTER ULTRASONIC SENSOR LH - REAR CORNER ULTRASONIC SENSOR LH)

(a) Disconnect the Y8 rear corner ultrasonic sensor LH connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Y7-1 (BO) - Y8-4 (BI)

Always

Below 1 Ω

Y7-2 (SO) - Y8-5 (SI)

Always

Below 1 Ω

Y7-3 (EO) - Y8-6 (EI)

Always

Below 1 Ω

Y7-1 (BO) or Y8-4 (BI) - Body ground

Always

10 kΩ or higher

Y7-2 (SO) or Y8-5 (SI) - Body ground

Always

10 kΩ or higher

Y7-3 (EO) or Y8-6 (EI) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

INSPECT REAR CORNER ULTRASONIC SENSOR RH

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 (BI) - 6 (EI)

Always

10 kΩ or higher

4 (BI) - 1 (BO)

Always

Below 1 Ω

5 (SI) - 2 (SO)

Always

Below 30 Ω

6 (EI) - 3 (EO)

Always

Below 1 Ω

*a

Component without harness connected

(Rear Corner Ultrasonic Sensor RH)
NG

REPLACE REAR CORNER ULTRASONIC SENSOR RH

OK

8.

INSPECT REAR CENTER ULTRASONIC SENSOR RH

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 (BI) - 6 (EI)

Always

10 kΩ or higher

4 (BI) - 1 (BO)

Always

Below 1 Ω

5 (SI) - 2 (SO)

Always

Below 30 Ω

6 (EI) - 3 (EO)

Always

Below 1 Ω

*a

Component without harness connected

(Rear Center Ultrasonic Sensor RH)
NG

REPLACE REAR CENTER ULTRASONIC SENSOR RH

OK

9.

INSPECT REAR CENTER ULTRASONIC SENSOR LH

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 (BI) - 6 (EI)

Always

10 kΩ or higher

4 (BI) - 1 (BO)

Always

Below 1 Ω

5 (SI) - 2 (SO)

Always

Below 30 Ω

6 (EI) - 3 (EO)

Always

Below 1 Ω

*a

Component without harness connected

(Rear Center Ultrasonic Sensor LH)
NG

REPLACE REAR CENTER ULTRASONIC SENSOR LH

OK

10.

INSPECT REAR CORNER ULTRASONIC SENSOR LH

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 (BI) - 6 (EI)

Always

10 kΩ or higher

4 (BI) - 1

Always

Below 1 Ω

5 (SI) - 2

Always

Below 30 Ω

6 (EI) - 3

Always

Below 1 Ω

*a

Component without harness connected

(Rear Corner Ultrasonic Sensor LH)
NG

REPLACE REAR CORNER ULTRASONIC SENSOR LH

OK

11.

REPLACE REAR CORNER ULTRASONIC SENSOR RH

Click here

NEXT

12.

CHECK DTC OUTPUT (C1AED)

(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 C1AED is output

A

No DTCs are output

B
B

END (REAR RIGHT SENSOR WAS DEFECTIVE)
A

13.

REPLACE REAR CENTER ULTRASONIC SENSOR RH

Click here

NEXT

14.

CHECK DTC OUTPUT (C1AED)

(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 C1AED is output

A

No DTCs are output

B
B

END (REAR RIGHT CENTER SENSOR WAS DEFECTIVE)
A

15.

REPLACE REAR CENTER ULTRASONIC SENSOR LH

Click here

NEXT

16.

CHECK DTC OUTPUT (C1AED)

(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 C1AED is output

A

No DTCs are output

B
B

END (REAR LEFT CENTER SENSOR WAS DEFECTIVE)
A

17.

REPLACE REAR CORNER ULTRASONIC SENSOR LH

Click here

NEXT

18.

CHECK DTC OUTPUT (C1AED)

(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 C1AED is output

A

No DTCs are output

B
A

REPLACE CLEARANCE WARNING ECU ASSEMBLY

B

END (REAR LEFT SENSOR WAS DEFECTIVE)
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