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 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).	Rear ultrasonic sensor circuit Clearance warning ECU

WIRING DIAGRAM

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Park Assist Monitoring.Toyota Parking Assist-Sensor System (W/ Multi-Display).
Dtc
C1Aed Rear Sensor Communication Malfunction

INSPECTION PROCEDURE

1.CHECK FOR DTC (C1AED)

Clear the DTCs (LandCruiser RM000000VKU06EX.html).

Recheck for DTCs (LandCruiser RM000000VKU06EX.html).
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 (LandCruiser RM000003YMJ00XX.html)

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

Disconnect the I1*1 or G154*2 clearance warning ECU connector.
1. *1: for 4 Sensor Type
2. *2: for 8 Sensor Type

Disconnect the V5 No. 1 ultrasonic sensor (rear corner sensor LH) connector.

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

Standard Resistance:

for 4 Sensor Type
Tester Connection	Condition	Specified Condition
I1-7 (BOR) - V5-1 (BI)	Always	Below 1 Ω
I1-24 (SOR) - V5-3 (SI)	Always	Below 1 Ω
I1-18 (E2) - V5-5 (EI)	Always	Below 1 Ω
I1-7 (BOR) - Body ground	Always	10 kΩ or higher
I1-24 (SOR) - Body ground	Always	10 kΩ or higher
I1-18 (E2) - Body ground	Always	10 kΩ or higher

for 8 Sensor Type
Tester Connection	Condition	Specified Condition
G154-7 (BOR) - V5-1 (BI)	Always	Below 1 Ω
G154-24 (SOR) - V5-3 (SI)	Always	Below 1 Ω
G154-18 (E2) - V5-5 (EI)	Always	Below 1 Ω
G154-7 (BOR) - Body ground	Always	10 kΩ or higher
G154-24 (SOR) - Body ground	Always	10 kΩ or higher
G154-18 (E2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

Disconnect the V5 No. 1 ultrasonic sensor (rear corner sensor LH) connector.

Disconnect the V4 No. 1 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
V5-2 (BO) - V4-1 (BI)	Always	Below 1 Ω
V5-4 (SO) - V4-3 (SI)	Always	Below 1 Ω
V5-6 (EO) - V4-5 (EI)	Always	Below 1 Ω
V5-2 (BO) - Body ground	Always	10 kΩ or higher
V5-4 (SO) - Body ground	Always	10 kΩ or higher
V5-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

Disconnect the V4 No. 1 ultrasonic sensor (rear center sensor LH) connector.

Disconnect the U4 No. 1 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
V4-2 (BO) - U4-1 (BI)	Always	Below 1 Ω
V4-4 (SO) - U4-3 (SI)	Always	Below 1 Ω
V4-6 (EO) - U4-5 (EI)	Always	Below 1 Ω
V4-2 (BO) - Body ground	Always	10 kΩ or higher
V4-4 (SO) - Body ground	Always	10 kΩ or higher
V4-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

Disconnect the U4 No. 1 ultrasonic sensor (rear center sensor RH) connector.

Disconnect the U5 No. 1 ultrasonic sensor (rear corner sensor RH) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
U4-2 (BO) - U5-1 (BI)	Always	Below 1 Ω
U4-4 (SO) - U5-3 (SI)	Always	Below 1 Ω
U4-6 (EO) - U5-5 (EI)	Always	Below 1 Ω
U4-2 (BO) - Body ground	Always	10 kΩ or higher
U4-4 (SO) - Body ground	Always	10 kΩ or higher
U4-6 (EO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

Remove the No. 1 ultrasonic sensor (rear corner sensor LH) (LandCruiser RM00000470F01FX.html).

Inspect the No. 1 ultrasonic sensor (rear corner sensor LH) (LandCruiser RM00000472K01FX.html).

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR LH) (LandCruiser RM00000470F01FX.html)

OK

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

Remove the No. 1 ultrasonic sensor (rear center sensor LH) (LandCruiser RM00000470F01FX.html).

Inspect the No. 1 ultrasonic sensor (rear center sensor LH) (LandCruiser RM00000472K01FX.html).

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CENTER SENSOR LH) (LandCruiser RM00000470F01FX.html)

OK

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

Remove the No. 1 ultrasonic sensor (rear center sensor RH) (LandCruiser RM00000470F01FX.html).

Inspect the No. 1 ultrasonic sensor (rear center sensor RH) (LandCruiser RM00000472K01FX.html).

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CENTER SENSOR RH) (LandCruiser RM00000470F01FX.html)

OK

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

Replace the No. 1 ultrasonic sensor (rear corner sensor RH) with a normally functioning sensor (LandCruiser RM00000470F01FX.html).
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 FOR DTC (C1AED)

Clear the DTCs (LandCruiser RM000000VKU06EX.html).

Check for DTCs (LandCruiser RM000000VKU06EX.html).
Result
Result
Proceed to
No DTC is output
A
DTC C1AED is output
B

Go to step 11

END (NO. 1 ULTRASONIC SENSOR [REAR CORNER SENSOR RH] WAS DEFECTIVE)

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

Replace the No. 1 ultrasonic sensor (rear center sensor LH) with a normally functioning sensor (LandCruiser RM00000470F01FX.html).
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 FOR DTC (C1AED)

Clear the DTCs (LandCruiser RM000000VKU06EX.html).

Check for DTCs (LandCruiser RM000000VKU06EX.html).
Result
Result
Proceed to
No DTC is output
A
DTC C1AED is output
B

Go to step 13

END (NO. 1 ULTRASONIC SENSOR [REAR CENTER SENSOR LH] WAS DEFECTIVE)

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

Replace the No. 1 ultrasonic sensor (rear center sensor RH) with a normally functioning sensor (LandCruiser RM00000470F01FX.html).
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 FOR DTC (C1AED)

Clear the DTCs (LandCruiser RM000000VKU06EX.html).

Check for DTCs (LandCruiser RM000000VKU06EX.html).
Result
Result
Proceed to
No DTC is output
A
DTC C1AED is output
B

Go to step 15

END (NO. 1 ULTRASONIC SENSOR [REAR CENTER SENSOR RH] WAS DEFECTIVE)

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

Replace the No. 1 ultrasonic sensor (rear corner sensor LH) with a normally functioning sensor (LandCruiser RM00000470F01FX.html).
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 FOR DTC (C1AED)

Clear the DTCs (LandCruiser RM000000VKU06EX.html).

Check for DTCs (LandCruiser RM000000VKU06EX.html).
Result
Result
Proceed to
No DTC is output
A
DTC C1AED is output
B

REPLACE CLEARANCE WARNING ECU (LandCruiser RM00000466X025X.html)

REPLACE CLEARANCE WARNING ECU (LandCruiser RM00000470500NX.html)

END (NO. 1 ULTRASONIC SENSOR [REAR CORNER SENSOR LH] WAS DEFECTIVE)