DTC    C1AED    Rear Sensor Communication Malfunction

for Preparation Click here


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.
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 power switch is turned on (IG).
  1. Rear ultrasonic sensor circuit
  2. Clearance warning ECU

WIRING DIAGRAM


E149954E11


INSPECTION PROCEDURE

1.CHECK DTC OUTPUT (C1AED)

  1. Check for DTCs (Click here).

  1. Clear the DTCs (Click here).

  1. Recheck for DTCs (Click here).

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



B
USE SIMULATION METHOD TO CHECK (Click here)
A


2.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - REAR RIGHT SENSOR)

  1. Disconnect the A49 connector from the clearance warning ECU.

  1. Disconnect the U1 connector from the No. 1 ultrasonic sensor.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A49-7 (BOR) - U1-1 (BI)
    		Always
    		Below 1 Ω
    A49-6 (SOR) - U1-3 (SI)
    A49-22 (E1) - U1-5 (EI)
    A49-7 (BOR) - Body ground
    		10 kΩ or higher
    A49-6 (SOR) - Body ground
    A49-22 (E1) - Body ground



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (REAR RIGHT SENSOR - REAR RIGHT CENTER SENSOR)

  1. Disconnect the U1 and U3 connectors from the No. 1 ultrasonic sensors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    U1-2 (BO) - U3-1 (BI)
    		Always
    		Below 1 Ω
    U1-4 (SO) - U3-3 (SI)
    U1-6 (EO) - U3-5 (EI)
    U1-2 (BO) - Body ground
    		10 kΩ or higher
    U1-4 (SO) - Body ground
    U1-6 (EO) - Body ground



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (REAR RIGHT CENTER SENSOR - REAR LEFT CENTER SENSOR)

  1. Disconnect the U3 and U4 connectors from the No. 1 ultrasonic sensors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    U3-2 (BO) - U4-1 (BI)
    		Always
    		Below 1 Ω
    U3-4 (SO) - U4-3 (SI)
    U3-6 (EO) - U4-5 (EI)
    U3-2 (BO) - Body ground
    		10 kΩ or higher
    U3-4 (SO) - Body ground
    U3-6 (EO) - Body ground



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (REAR LEFT CENTER SENSOR - REAR LEFT SENSOR)

  1. Disconnect the U4 and U2 connectors from the No. 1 ultrasonic sensors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    U4-2 (BO) - U2-1 (BI)
    		Always
    		Below 1 Ω
    U4-4 (SO) - U2-3 (SI)
    U4-6 (EO) - U2-5 (EI)
    U4-2 (BO) - Body ground
    		10 kΩ or higher
    U4-4 (SO) - Body ground
    U4-6 (EO) - Body ground



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR)

  1. Remove the No. 1 ultrasonic sensor (rear right sensor) (Click here).



    E221362E01

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (BI) - 5 (EI)
    		Always
    		10 kΩ or higher
    1 (BI) - 2 (BO)
    3 (SI) - 4 (SO)
    		Below 1 Ω
    5 (EI) - 6 (EO)

    Text in Illustration 
    *a
    		Component without harness connected
    (No. 1 Ultrasonic Sensor (Rear Right Sensor))



NG
REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR) (Click here)
OK


7.CHECK NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR)

  1. Remove the No. 1 ultrasonic sensor (rear right center sensor) (Click here).



    E221362E01

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (BI) - 5 (EI)
    		Always
    		10 kΩ or higher
    1 (BI) - 2 (BO)
    3 (SI) - 4 (SO)
    		Below 1 Ω
    5 (EI) - 6 (EO)

    Text in Illustration 
    *a
    		Component without harness connected
    (No. 1 Ultrasonic Sensor (Rear Right Center Sensor))



NG
REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR) (Click here)
OK


8.CHECK NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)

  1. Remove the No. 1 ultrasonic sensor (rear left center sensor) (Click here).



    E221362E01

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (BI) - 5 (EI)
    		Always
    		10 kΩ or higher
    1 (BI) - 2 (BO)
    3 (SI) - 4 (SO)
    		Below 1 Ω
    5 (EI) - 6 (EO)

    Text in Illustration 
    *a
    		Component without harness connected
    (No. 1 Ultrasonic Sensor (Rear Left Center Sensor))



NG
REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR) (Click here)
OK


9.REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT SENSOR)

  1. Replace the No. 1 ultrasonic sensor (rear right sensor) with a known good one (Click here).

    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.


NEXT


10.CHECK DTC OUTPUT (C1AED)

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

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



B
END (REAR RIGHT SENSOR WAS DEFECTIVE)
A


11.REPLACE NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR)

  1. Replace the No. 1 ultrasonic sensor (rear right center sensor) with a known good one (Click here).

    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.


NEXT


12.CHECK DTC OUTPUT (C1AED)

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

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



B
END (REAR RIGHT CENTER SENSOR WAS DEFECTIVE)
A


13.REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)

  1. Replace the No. 1 ultrasonic sensor (rear left center sensor) with a known good one (Click here).

    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.


NEXT


14.CHECK DTC OUTPUT (C1AED)

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

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



B
END (REAR LEFT CENTER SENSOR WAS DEFECTIVE)
A


15.REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT SENSOR)

  1. Replace the No. 1 ultrasonic sensor (rear left sensor) with a known good one (Click here).

    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.


NEXT


16.CHECK DTC OUTPUT (C1AED)

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

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



B
END (REAR LEFT SENSOR WAS DEFECTIVE)
A

REPLACE CLEARANCE WARNING ECU ASSEMBLY (Click here)