Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Ultrasonic Sensor (Rear Right Corner) Missing Message (C1AE987)

DESCRIPTION

This DTC is output when an open circuit or short occurs in the communication line between a rear corner ultrasonic sensor (RR sensor) and the rear center ultrasonic sensor (RRC sensor), or when a malfunction occurs in a rear corner ultrasonic sensor (RR sensor) on the rear.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AE987

Ultrasonic Sensor (Rear Right Corner) Missing Message

Rear corner ultrasonic sensor (RR sensor) lost communication

  • Rear corner ultrasonic sensor (RR sensor)
  • Harness or connector
  • Clearance warning ECU assembly

WIRING DIAGRAM

for HEV Model

for Gasoline Model

CAUTION / NOTICE / HINT

NOTICE:

  • Perform registration after replacing or removing and installing the ultrasonic sensor or clearance warning ECU assembly.

    Click here

  • If a DTC is detected again after the repair, turn the ignition switch to ON and turn the intuitive parking assist system on, and then clear the DTC.

PROCEDURE

1.

CHECK DTC

(a) If DTC C1AE896 is output, perform troubleshooting for DTC C1AE896 first.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

C1AE896 is not output

A

C1AE896 is output

B

B

GO TO C1AE896

A

2.

VEHICLE CONDITION AND WORK DETAILS CHECK

(a) Check the vehicle condition and work details.

Result

Proceed to

The clearance warning ECU assembly or ultrasonic sensor has not been replaced

A

The clearance warning ECU assembly or ultrasonic sensor has been replaced

B

B

GO TO CALIBRATION

A

3.

CHECK CONNECTOR CONNECTION CONDITION (ULTRASONIC SENSOR)

(a) Check that the connector is properly connected to the rear corner ultrasonic sensor and rear center ultrasonic sensor.

NEXT

4.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

5.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

DTCs are not output

A

C1AE987 is output

B

None of the above conditions are met

C

A

END (CONNECTOR CONNECTION MALFUNCTION)

C

GO TO DTC CHART

B

6.

CHECK CONNECTOR CONNECTION CONDITION (CLEARANCE WARNING ECU ASSEMBLY)

(a) Check that the connector is properly connected to the clearance warning ECU assembly.

NEXT

7.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

8.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

DTCs are not output

A

C1AE687, C1AE787, C1AE887 and C1AE987 are output

B

C1AE787, C1AE887 and C1AE987 are output

C

C1AE887 and C1AE987 are output

D

C1AE987 is output

E

None of the above conditions are met

F

A

USE SIMULATION METHOD TO CHECK

B

GO TO DTC (C1AE687)

C

GO TO DTC (C1AE787)

D

GO TO DTC (C1AE887)

F

GO TO DTC CHART

E

9.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for HEV Model

A

for Gasoline Model

B

B

GO TO STEP 14

A

10.

CHECK HARNESS AND CONNECTOR (REAR CENTER ULTRASONIC SENSOR [RRC SENSOR] - REAR CORNER ULTRASONIC SENSOR [RR SENSOR])

(a) Disconnect the V2 rear center ultrasonic sensor (RRC sensor) connector.

(b) Disconnect the V3 rear corner ultrasonic sensor (RR sensor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V2-1 (BO) - V3-4 (BI)

Always

Below 1 Ω

V2-2 (SO) - V3-5 (SI)

Always

Below 1 Ω

V2-3 (EO) - V3-6 (EI)

Always

Below 1 Ω

V2-1 (BO) or V3-4 (BI) - Body ground

Always

10 kΩ or higher

V2-2 (SO) or V3-5 (SI) - Body ground

Always

10 kΩ or higher

V2-3 (EO) or V3-6 (EI) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.

REPLACE REAR CORNER ULTRASONIC SENSOR (RR SENSOR)

(a) Replace the rear corner ultrasonic sensor (RR sensor) with a known good one.

HINT:

  • Click here
  • 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.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
NEXT

13.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes

Result

Proceed to

DTCs are not output

A

C1AE987 is output

B

None of the above conditions are met

C

A

END (REAR CORNER ULTRASONIC SENSOR [RR SENSOR] WAS DEFECTIVE)

B

REPLACE CLEARANCE WARNING ECU ASSEMBLY

C

GO TO DTC CHART

14.

CHECK HARNESS AND CONNECTOR (REAR CENTER ULTRASONIC SENSOR [RRC SENSOR] - REAR CORNER ULTRASONIC SENSOR [RR SENSOR])

(a) Disconnect the R16 rear center ultrasonic sensor (RRC sensor) connector.

(b) Disconnect the R17 rear corner ultrasonic sensor (RR sensor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R16-1 (BO) - R17-4 (BI)

Always

Below 1 Ω

R16-2 (SO) - R17-5 (SI)

Always

Below 1 Ω

R16-3 (EO) - R17-6 (EI)

Always

Below 1 Ω

R16-1 (BO) or R17-4 (BI) - Body ground

Always

10 kΩ or higher

R16-2 (SO) or R17-5 (SI) - Body ground

Always

10 kΩ or higher

R16-3 (EO) or R17-6 (EI) - Body ground

Always

10 kΩ or higher

OK

GO TO STEP 11

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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