Toyota Tacoma 2015-2018 Service Manual: Rear Sensor Communication Malfunction (C1AED)

Toyota Tacoma 2015-2018 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 ignition switch is turned ON.	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 ). ).

(b) Clear the DTCs (See page (c) Recheck for DTCs (See page ). ).

Result

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 CORNER SENSOR RH)

(a) Disconnect the C30 connector from the clearance warning ECU assembly.

(b) Disconnect the R43 connector from the No. 1 ultrasonic sensor.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C30-22 (BOR) - R43-1 (BI)	Always	Below 1 Ω
C30-24 (SOR) - R43-3 (SI)
C30-23 (E1) - R43-5 (EI)
C30-22 (BOR) - Body ground		10 kΩ or higher
C30-24 (SOR) - Body ground
C30-23 (E1) - Body ground

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the R43 and R41 connectors from the No. 1 ultrasonic sensors.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R43-2 (BO) - R41-1 (BI)	Always	Below 1 Ω
R43-4 (SO) - R41-3 (SI)
R43-6 (EO) - R41-5 (EI)
R43-2 (BO) - Body ground		10 kΩ or higher
R43-4 (SO) - Body ground
R43-6 (EO) - Body ground

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the R41 and R40 connectors from the No. 1 ultrasonic sensors.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R41-2 (BO) - R40-1 (BI)	Always	Below 1 Ω
R41-4 (SO) - R40-3 (SI)
R41-6 (EO) - R40-5 (EI)
R41-2 (BO) - Body ground		10 kΩ or higher
R41-4 (SO) - Body ground
R41-6 (EO) - Body ground

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the R40 and R42 connectors from the No. 1 ultrasonic sensors.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R40-2 (BO) - R42-1 (BI)	Always	Below 1 Ω
R40-4 (SO) - R42-3 (SI)
R40-6 (EO) - R42-5 (EI)
R40-2 (BO) - Body ground		10 kΩ or higher
R40-4 (SO) - Body ground
R40-6 (EO) - Body ground

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)

(a) Remove the No. 1 ultrasonic sensor (rear corner sensor RH) (See page ).

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

Text in Illustration

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

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)

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

(a) Remove the No. 1 ultrasonic sensor (rear center sensor RH) (See page ).

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

Text in Illustration

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

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

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

(a) Remove the No. 1 ultrasonic sensor (rear center sensor LH) (See page ).

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

Text in Illustration

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

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

9.	REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)

10.	CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page Result ).

Result

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

END (REAR CORNER SENSOR RH WAS DEFECTIVE)

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

12.	CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page Result ).

Result

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

END (REAR CENTER SENSOR RH WAS DEFECTIVE)

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

14.	CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page Result ).

Result

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

END (REAR CENTER SENSOR LH WAS DEFECTIVE)

15.	REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR LH)

16.	CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page Result ).

Result

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

REPLACE CLEARANCE WARNING ECU ASSEMBLY

END (REAR CORNER SENSOR LH WAS DEFECTIVE)

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