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. 1 ultrasonic sensor (rear side) Harness or connector Parking assist ECU1 Clearance warning ECU assembly2

*1: w/ Side Monitor System
*2: w/o Side Monitor System

WIRING DIAGRAM

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

INSPECTION PROCEDURE

1.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).
Result
Result
Proceed to
DTC C1AED is output (w/ Side Monitor System)
A
DTC C1AED is output (w/o Side Monitor System)
B
DTC C1AED is not output
C

Go to step 16

USE SIMULATION METHOD TO CHECK (Click here)

A

2.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RR SENSOR] - PARKING ASSIST ECU)

Disconnect the O9 No. 1 ultrasonic sensor (RR sensor) connector.

Disconnect the F76 parking assist ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O9-1 (BI) - F76-20 (CGB2)	Always	Below 1 Ω
O9-3 (SI) - F76-3 (LIN2)	Always	Below 1 Ω
O9-5 (EI) - F76-4 (CSG2)	Always	Below 1 Ω
O9-1 (BI) - Body ground	Always	10 kΩ or higher
O9-3 (SI) - Body ground	Always	10 kΩ or higher
O9-5 (EI) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RR SENSOR] - NO. 1 ULTRASONIC SENSOR [RRC SENSOR])

Disconnect the O9 No. 1 ultrasonic sensor (RR sensor) connector.

Disconnect the O10 No. 1 ultrasonic sensor (RRC sensor) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O9-2 (BO) - O10-1 (BI)	Always	Below 1 Ω
O9-4 (SO) - O10-3 (SI)	Always	Below 1 Ω
O9-6 (EO) - O10-5 (EI)	Always	Below 1 Ω
O9-2 (BO) - Body ground	Always	10 kΩ or higher
O9-4 (SO) - Body ground	Always	10 kΩ or higher
O9-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RRC SENSOR] - NO. 1 ULTRASONIC SENSOR [RLC SENSOR])

Disconnect the O10 No. 1 ultrasonic sensor (RRC sensor) connector.

Disconnect the O11 No. 1 ultrasonic sensor (RLC sensor) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O10-2 (BO) - O11-1 (BI)	Always	Below 1 Ω
O10-4 (SO) - O11-3 (SI)	Always	Below 1 Ω
O10-6 (EO) - O11-5 (EI)	Always	Below 1 Ω
O10-2 (BO) - Body ground	Always	10 kΩ or higher
O10-4 (SO) - Body ground	Always	10 kΩ or higher
O10-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RLC SENSOR] - NO. 1 ULTRASONIC SENSOR [RL SENSOR])

Disconnect the O11 No. 1 ultrasonic sensor (RLC sensor) connector.

Disconnect the O12 No. 1 ultrasonic sensor (RL sensor) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O11-2 (BO) - O12-1 (BI)	Always	Below 1 Ω
O11-4 (SO) - O12-3 (SI)	Always	Below 1 Ω
O11-6 (EO) - O12-5 (EI)	Always	Below 1 Ω
O11-2 (BO) - Body ground	Always	10 kΩ or higher
O11-4 (SO) - Body ground	Always	10 kΩ or higher
O11-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.CHECK PARKING ASSIST ECU

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
F76-4 (CGB2) - Body ground
Engine switch on (IG)
7.2 to 8.8 V

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
F76-20 (CSG2) - Body ground
Always
Below 1 Ω

Text in Illustration
*a	Component with harness connected (Parking Assist ECU)

REPLACE PARKING ASSIST ECU (Click here)

OK

Go to step 3

7.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).

Result
Result	Proceed to
DTC C1AED is output and multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right)	A
DTC C1AED is output and multi-information display indicates open circuit (Rear Left and Rear Center)	B
DTC C1AED is not output	C

Go to step 12

USE SIMULATION METHOD TO CHECK (Click here)

A

8.REPLACE NO. 1 ULTRASONIC SENSOR (RR SENSOR)

Replace the No. 1 ultrasonic sensor (RR sensor) with a normally functioning one (Click here).

NEXT

9.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).

Result
Result	Proceed to
DTC C1AED is output and multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right)	A
DTC C1AED is output and multi-information display indicates open circuit (Rear Left and Rear Center)	B
DTC C1AED is not output	C

Go to step 12

END (NO. 1 ULTRASONIC SENSOR [RR SENSOR] IS DEFECTIVE)

A

10.REPLACE NO. 1 ULTRASONIC SENSOR (RL SENSOR)

Replace the No. 1 ultrasonic sensor (RL sensor) with a normally functioning one (Click here).

NEXT

11.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).

Result
Result	Proceed to
DTC C1AED is output and multi-information display indicates open circuit (Rear Left and Rear Center)	A
DTC C1AED is output and multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right)	B
DTC C1AED is not output	C

REPLACE PARKING ASSIST ECU (Click here)

END (NO. 1 ULTRASONIC SENSOR [RL SENSOR] IS DEFECTIVE)

A

12.REPLACE NO. 1 ULTRASONIC SENSOR (RRC SENSOR)

Replace the No. 1 ultrasonic sensor (RRC sensor) with a normally functioning one (Click here).

NEXT

13.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).
OK:
DTC C1AED is not output

Go to step 14

END (NO. 1 ULTRASONIC SENSOR [RRC SENSOR] IS DEFECTIVE)

14.REPLACE NO. 1 ULTRASONIC SENSOR (RLC SENSOR)

Replace the No. 1 ultrasonic sensor (RLC sensor) with a normally functioning one (Click here).

NEXT

15.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).
OK:
DTC C1AED is not output

REPLACE PARKING ASSIST ECU (Click here)

END (NO. 1 ULTRASONIC SENSOR [RLC SENSOR] IS DEFECTIVE)

16.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RR SENSOR] - CLEARANCE WARNING ECU ASSEMBLY)

Disconnect the O9 No. 1 ultrasonic sensor (RR sensor) connector.

Disconnect the F12 clearance warning ECU assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O9-1 (BI) - F12-7 (CGB2)	Always	Below 1 Ω
O9-3 (SI) - F12-24 (LIN2)	Always	Below 1 Ω
O9-5 (EI) - F12-18 (CSG2)	Always	Below 1 Ω
O9-1 (BI) - Body ground	Always	10 kΩ or higher
O9-3 (SI) - Body ground	Always	10 kΩ or higher
O9-5 (EI) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

17.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RR SENSOR] - NO. 1 ULTRASONIC SENSOR [RRC SENSOR])

Disconnect the O9 No. 1 ultrasonic sensor (RR sensor) connector.

Disconnect the O10 No. 1 ultrasonic sensor (RRC sensor) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O9-2 (BO) - O10-1 (BI)	Always	Below 1 Ω
O9-4 (SO) - O10-3 (SI)	Always	Below 1 Ω
O9-6 (EO) - O10-5 (EI)	Always	Below 1 Ω
O9-2 (BO) - Body ground	Always	10 kΩ or higher
O9-4 (SO) - Body ground	Always	10 kΩ or higher
O9-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

18.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RRC SENSOR] - NO. 1 ULTRASONIC SENSOR [RLC SENSOR])

Disconnect the O10 No. 1 ultrasonic sensor (RRC sensor) connector.

Disconnect the O11 No. 1 ultrasonic sensor (RLC sensor) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O10-2 (BO) - O11-1 (BI)	Always	Below 1 Ω
O10-4 (SO) - O11-3 (SI)	Always	Below 1 Ω
O10-6 (EO) - O11-5 (EI)	Always	Below 1 Ω
O10-2 (BO) - Body ground	Always	10 kΩ or higher
O10-4 (SO) - Body ground	Always	10 kΩ or higher
O10-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

19.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [RLC SENSOR] - NO. 1 ULTRASONIC SENSOR [RL SENSOR])

Disconnect the O11 No. 1 ultrasonic sensor (RLC sensor) connector.

Disconnect the O12 No. 1 ultrasonic sensor (RL sensor) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O11-2 (BO) - O12-1 (BI)	Always	Below 1 Ω
O11-4 (SO) - O12-3 (SI)	Always	Below 1 Ω
O11-6 (EO) - O12-5 (EI)	Always	Below 1 Ω
O11-2 (BO) - Body ground	Always	10 kΩ or higher
O11-4 (SO) - Body ground	Always	10 kΩ or higher
O11-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

20.CHECK CLEARANCE WARNING ECU ASSEMBLY

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
F12-7 (CGB2) - Body ground
Engine switch on (IG)
7.2 to 8.8 V

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
F12-18 (CSG2) - Body ground
Always
Below 1 Ω

Text in Illustration
*a	Component with harness connected (Clearance Warning ECU Assembly)

REPLACE CLEARANCE WARNING ECU ASSEMBLY (Click here)

OK

21.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).

Result
Result	Proceed to
DTC C1AED is output and multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right)	A
DTC C1AED is output and multi-information display indicates open circuit (Rear Left and Rear Center)	B
DTC C1AED is not output	C

Go to step 26

USE SIMULATION METHOD TO CHECK (Click here)

A

22.REPLACE NO. 1 ULTRASONIC SENSOR (RR SENSOR)

Replace the No. 1 ultrasonic sensor (RR sensor) with a normally functioning one (Click here).

NEXT

23.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).

Result
Result	Proceed to
DTC C1AED is output and multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right)	A
DTC C1AED is output and multi-information display indicates open circuit (Rear Left and Rear Center)	B
DTC C1AED is not output	C

Go to step 26

END (NO. 1 ULTRASONIC SENSOR [RR SENSOR] IS DEFECTIVE)

A

24.REPLACE NO. 1 ULTRASONIC SENSOR (RL SENSOR)

Replace the No. 1 ultrasonic sensor (RL sensor) with a normally functioning one (Click here).

NEXT

25.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).

Result
Result	Proceed to
DTC C1AED is output and multi-information display indicates open circuit (Rear Left and Rear Center)	A
DTC C1AED is output and multi-information display indicates open circuit (Rear Left, Rear Center and Rear Right)	B
DTC C1AED is not output	C

REPLACE CLEARANCE WARNING ECU ASSEMBLY (Click here)

END (NO. 1 ULTRASONIC SENSOR [RL SENSOR] IS DEFECTIVE)

A

26.REPLACE NO. 1 ULTRASONIC SENSOR (RRC SENSOR)

Replace the No. 1 ultrasonic sensor (RRC sensor) with a normally functioning one (Click here).

NEXT

27.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).
OK:
DTC C1AED is not output

Go to step 28

END (NO. 1 ULTRASONIC SENSOR [RRC SENSOR] IS DEFECTIVE)

28.REPLACE NO. 1 ULTRASONIC SENSOR (RLC SENSOR)

Replace the No. 1 ultrasonic sensor (RLC sensor) with a normally functioning one (Click here).

NEXT

29.CHECK FOR DTC

Clear the DTCs (Click here).

Check for DTCs (Click here).
OK:
DTC C1AED is not output

REPLACE CLEARANCE WARNING ECU ASSEMBLY (Click here)

END (NO. 1 ULTRASONIC SENSOR [RLC SENSOR] IS DEFECTIVE)

Result	Proceed to
DTC C1AED is output (w/ Side Monitor System)	A
DTC C1AED is output (w/o Side Monitor System)	B
DTC C1AED is not output	C

Tester Connection	Switch Condition	Specified Condition
F76-4 (CGB2) - Body ground	Engine switch on (IG)	7.2 to 8.8 V