Toyota Venza: Rear Sensor Communication Malfunction (C1AED)

Toyota Venza Service Manual / Park Assist / Monitoring / Intuitive Parking Assist 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.	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).	Rear ultrasonic sensor circuit Clearance warning ECU assembly

WIRING DIAGRAM

PROCEDURE

1.	CHECK DTC OUTPUT (C1AED)

(a) Check for DTCs (See page ).

(b) Clear the DTCs (See page ).

Result	Proceed to
DTC C1AED is output	A
No DTCs are output	B

USE SIMULATION METHOD TO CHECK

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

(a) Disconnect the D79 clearance warning ECU assembly connector.

(b) Disconnect the Q1 No. 1 ultrasonic sensor connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D79-22 (BOR) - Q1-1 (BI)	Always	Below 1 Ω
D79-24 (SOR) - Q1-3 (SI)	Always	Below 1 Ω
D79-23 (E1) - Q1-5 (EI)	Always	Below 1 Ω
D79-22 (BOR) - Body ground	Always	10 kΩ or higher
D79-24 (SOR) - Body ground	Always	10 kΩ or higher
D79-23 (E1) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the Q2 No. 1 ultrasonic sensor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q1-2 (BO) - Q2-1 (BI)	Always	Below 1 Ω
Q1-4 (SO) - Q2-3 (SI)	Always	Below 1 Ω
Q1-6 (EO) - Q2-5 (EI)	Always	Below 1 Ω
Q1-2 (BO) - Body ground	Always	10 kΩ or higher
Q1-4 (SO) - Body ground	Always	10 kΩ or higher
Q1-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the Q3 No. 1 ultrasonic sensor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q2-2 (BO) - Q3-1 (BI)	Always	Below 1 Ω
Q2-4 (SO) - Q3-3 (SI)	Always	Below 1 Ω
Q2-6 (EO) - Q3-5 (EI)	Always	Below 1 Ω
Q2-2 (BO) - Body ground	Always	10 kΩ or higher
Q2-4 (SO) - Body ground	Always	10 kΩ or higher
Q2-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the Q4 No. 1 ultrasonic sensor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q3-2 (BO) - Q4-1 (BI)	Always	Below 1 Ω
Q3-4 (SO) - Q4-3 (SI)	Always	Below 1 Ω
Q3-6 (EO) - Q4-5 (EI)	Always	Below 1 Ω
Q3-2 (BO) - Body ground	Always	10 kΩ or higher
Q3-4 (SO) - Body ground	Always	10 kΩ or higher
Q3-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT NO. 1 ULTRASONIC SENSOR (REAR LEFT SENSOR)

(a) 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)	Always	10 kΩ or higher
3 (SI) - 4 (SO)	Always	Below 1 Ω
5 (EI) - 6 (EO)	Always	Below 1 Ω

Text in Illustration

*a	Component without harness connected (No. 1 Ultrasonic Sensor (Rear Left Sensor))

REPLACE NO. 1 ULTRASONIC SENSOR (REAR LEFT SENSOR)

7.	INSPECT NO. 1 ULTRASONIC SENSOR (REAR LEFT CENTER SENSOR)

(a) 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)	Always	10 kΩ or higher
3 (SI) - 4 (SO)	Always	Below 1 Ω
5 (EI) - 6 (EO)	Always	Below 1 Ω

Text in Illustration

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

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

8.	INSPECT NO. 1 ULTRASONIC SENSOR (REAR RIGHT CENTER SENSOR)

(a) 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)	Always	10 kΩ or higher
3 (SI) - 4 (SO)	Always	Below 1 Ω
5 (EI) - 6 (EO)	Always	Below 1 Ω

Text in Illustration

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

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

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

10.	CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

Result	Proceed to
DTC C1AED is output	A
No DTCs are output	B

END

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

12.	CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

Result	Proceed to
DTC C1AED is output	A
No DTCs are output	B

END

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

14.	CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

Result	Proceed to
DTC C1AED is output	A
No DTCs are output	B

END

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

16.	CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

Result	Proceed to
DTC C1AED is output	A
No DTCs are output	B

REPLACE CLEARANCE WARNING ECU ASSEMBLY

END

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