Park Assist Monitoring. Dtc C1Aed Rear Sensor Communication Malfunction

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 Code	DTC Detection Condition	Trouble Area
C1AED	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).	No. 2 ultrasonic sensor (rear side) Harness or connector Clearance warning ECU assembly

WIRING DIAGRAM

Land Cruiser. Urj200, 202 Grj200 Vdj200.Park Assist Monitoring.Toyota Parking Assist-Sensor System.
Dtc
C1Aed Rear Sensor Communication Malfunction

INSPECTION PROCEDURE

NOTICE:

If DTCs are output after repairs, turn the engine switch on (IG) and turn the TOYOTA parking assist-sensor system on. Then clear the DTCs (Click here).

1.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).
Result
Result
Proceed to
No DTC is output.
A
DTC C1AED is output.
B

Result
Result	Proceed to
No DTC is output.	A
DTC C1AED is output.	B

Go to step 2

USE SIMULATION METHOD TO CHECK (Click here)

2.CHECK HARNESS AND CONNECTOR (NO. 2 ULTRASONIC SENSOR [REAR CORNER SENSOR RH] - CLEARANCE WARNING ECU ASSEMBLY)

Disconnect the O13 No. 2 ultrasonic sensor (rear corner sensor RH) connector.

Disconnect the F92 clearance warning ECU assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F92-22 (BOR) - O13-1 (BI)	Always	Below 1 Ω
F92-24 (SOR) - O13-3 (SI)	Always	Below 1 Ω
F92-23 (E1) - O13-5 (EI)	Always	Below 1 Ω
F92-22 (BOR) - Body ground	Always	10 kΩ or higher
F92-24 (SOR) - Body ground	Always	10 kΩ or higher
F92-23 (E1) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK HARNESS AND CONNECTOR (NO. 2 ULTRASONIC SENSOR [REAR CORNER SENSOR RH] - NO. 2 ULTRASONIC SENSOR [REAR CENTER SENSOR RH])

Disconnect the O13 No. 2 ultrasonic sensor (rear corner sensor RH) connector.

Disconnect the O14 No. 2 ultrasonic sensor (rear center sensor RH) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O13-2 (BO) - O14-1 (BI)	Always	Below 1 Ω
O13-4 (SO) - O14-3 (SI)	Always	Below 1 Ω
O13-6 (EO) - O14-5 (EI)	Always	Below 1 Ω
O13-2 (BO) - Body ground	Always	10 kΩ or higher
O13-4 (SO) - Body ground	Always	10 kΩ or higher
O13-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK HARNESS AND CONNECTOR (NO. 2 ULTRASONIC SENSOR [REAR CENTER SENSOR RH] - NO. 2 ULTRASONIC SENSOR [REAR CENTER SENSOR LH])

Disconnect the O14 No. 2 ultrasonic sensor (rear center sensor RH) connector.

Disconnect the O15 No. 2 ultrasonic sensor (rear center sensor LH) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O14-2 (BO) - O15-1 (BI)	Always	Below 1 Ω
O14-4 (SO) - O15-3 (SI)	Always	Below 1 Ω
O14-6 (EO) - O15-5 (EI)	Always	Below 1 Ω
O14-2 (BO) - Body ground	Always	10 kΩ or higher
O14-4 (SO) - Body ground	Always	10 kΩ or higher
O14-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.CHECK HARNESS AND CONNECTOR (NO. 2 ULTRASONIC SENSOR [REAR CENTER SENSOR LH] - NO. 1 ULTRASONIC SENSOR [REAR CORNER SENSOR LH])

Disconnect the O15 No. 2 ultrasonic sensor (rear center sensor LH) connector.

Disconnect the O16 No. 2 ultrasonic sensor (rear corner sensor LH) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O15-2 (BO) - O16-1 (BI)	Always	Below 1 Ω
O15-4 (SO) - O16-3 (SI)	Always	Below 1 Ω
O15-6 (EO) - O16-5 (EI)	Always	Below 1 Ω
O15-2 (BO) - Body ground	Always	10 kΩ or higher
O15-4 (SO) - Body ground	Always	10 kΩ or higher
O15-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.INSPECT NO. 2 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)

Remove the No. 2 ultrasonic sensor (rear corner sensor RH) (Click here).

Inspect the No. 2 ultrasonic sensor (rear corner sensor RH) (Click here).

REPLACE NO. 2 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)

OK

7.INSPECT NO. 2 ULTRASONIC SENSOR (REAR CENTER SENSOR RH)

Remove the No. 2 ultrasonic sensor (rear center sensor RH) (Click here).

Inspect the No. 2 ultrasonic sensor (rear center sensor RH) (Click here).

REPLACE NO. 2 ULTRASONIC SENSOR (REAR CENTER SENSOR RH)

OK

8.INSPECT NO. 2 ULTRASONIC SENSOR (REAR CENTER SENSOR LH)

Remove the No. 2 ultrasonic sensor (rear center sensor LH) (Click here).

Inspect the No. 2 ultrasonic sensor (rear center sensor LH) (Click here).

REPLACE NO. 2 ULTRASONIC SENSOR (REAR CENTER SENSOR LH)

OK

9.INSPECT NO. 2 ULTRASONIC SENSOR (REAR CORNER SENSOR LH)

Remove the No. 2 ultrasonic sensor (rear corner sensor LH) (Click here).

Inspect the No. 2 ultrasonic sensor (rear corner sensor LH) (Click here).

REPLACE NO. 2 ULTRASONIC SENSOR (REAR CENTER SENSOR LH)

OK

10.REPLACE NO. 2 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)

Replace the No. 2 ultrasonic sensor (rear corner sensor RH) with a normally functioning sensor (Click here).

NEXT

11.CHECK FOR DTC (C1AED)

Clear the DTCs (Click here).

Check for DTCs (Click here).
Result
Result
Proceed to
DTC C1AED is output.
A
No DTC is output.
B

END (NO. 2 ULTRASONIC SENSOR [REAR CORNER SENSOR RH] IS DEFECTIVE)

A

12.REPLACE NO. 2 ULTRASONIC SENSOR (REAR CENTER SENSOR RH)

Replace the No. 2 ultrasonic sensor (rear center sensor RH) with a normally functioning sensor (Click here).

NEXT

13.CHECK FOR DTC (C1AED)

Clear the DTCs (Click here).

Check for DTCs (Click here).
Result
Result
Proceed to
DTC C1AED is output.
A
No DTC is output.
B

END (NO. 2 ULTRASONIC SENSOR [REAR CENTER SENSOR RH] IS DEFECTIVE)

A

14.REPLACE NO. 2 ULTRASONIC SENSOR (REAR CENTER SENSOR LH)

Replace the No. 2 ultrasonic sensor (rear center sensor LH) with a normally functioning sensor (Click here).

NEXT

15.CHECK FOR DTC (C1AED)

Clear the DTCs (Click here).

Check for DTCs (Click here).
Result
Result
Proceed to
DTC C1AED is output.
A
No DTC is output.
B

END (NO. 2 ULTRASONIC SENSOR [REAR CENTER SENSOR LH] IS DEFECTIVE)

A

16.REPLACE NO. 2 ULTRASONIC SENSOR (REAR CORNER SENSOR LH)

Replace the No. 2 ultrasonic sensor (rear corner sensor LH) with a normally functioning sensor (Click here).

NEXT

17.CHECK FOR DTC (C1AED)

Clear the DTCs (Click here).

Check for DTCs (Click here).
Result
Result
Proceed to
DTC C1AED is output.
A
No DTC is output.
B

END (NO. 2 ULTRASONIC SENSOR [REAR CORNER SENSOR LH] IS DEFECTIVE)

REPLACE CLEARANCE WARNING ECU ASSEMBLY (Click here)