RM38T0EC _56 Audio / Visual / Telematics _111969 PARK ASSIST / MONITORING _0514279 TOYOTA PARKING ASSIST-SENSOR SYSTEM C

PARK ASSIST / MONITORING  TOYOTA PARKING ASSIST-SENSOR SYSTEM  C1AE187  Ultrasonic Sensor (Front Left Corner) Missing Message  


DESCRIPTION

This DTC is output when an open circuit or short occurs in the communication line between a front corner ultrasonic sensor (FL sensor) and the clearance warning ECU assembly, or when a malfunction occurs in a front corner ultrasonic sensor (FL sensor) on the front.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AE187 Ultrasonic Sensor (Front Left Corner) Missing Message Front corner ultrasonic sensor (FL sensor) lost communication
·

Front corner ultrasonic sensor (FL sensor)

·

Harness or connector

·

Clearance warning ECU assembly



WIRING DIAGRAM

E483662E01
5.458,1.75 6.979,2.396 1.521,0.646 10 false Clearance Warning ECU Assembly 2.917,1.76 4.417,2.583 1.5,0.823 10 false Front Corner Ultrasonic Sensor (FL Sensor) 0.417,1.76 1.917,2.583 1.5,0.823 10 false Front Corner Ultrasonic Sensor (FR Sensor) 0.417,1.583 0.833,1.823 0.417,0.24 10 false B12 2.917,1.583 3.333,1.823 0.417,0.24 10 false B9 5.5,1.583 5.917,1.823 0.417,0.24 10 false I24 5.708,0.406 6.125,0.646 0.417,0.24 10 false BOF 5.708,0.813 6.125,1.052 0.417,0.24 10 false SOF 5.708,1.188 6.125,1.427 0.417,0.24 10 false E5 3.167,0.417 3.583,0.656 0.417,0.24 10 false BO 3.167,0.813 3.583,1.052 0.417,0.24 10 false SO 3.167,1.198 3.583,1.438 0.417,0.24 10 false EO 3.844,0.427 4.26,0.667 0.417,0.24 10 false BI 3.844,0.813 4.26,1.052 0.417,0.24 10 false SI 3.844,1.198 4.26,1.438 0.417,0.24 10 false EI 1.323,0.396 1.74,0.635 0.417,0.24 10 false BI 1.323,0.813 1.74,1.052 0.417,0.24 10 false SI 1.323,1.188 1.74,1.427 0.417,0.24 10 false EI 5.479,0.292 5.896,0.531 0.417,0.24 10 false 2 2.948,0.688 3.365,0.927 0.417,0.24 10 false 2 2.948,0.302 3.365,0.542 0.417,0.24 10 false 1 2.948,1.073 3.365,1.313 0.417,0.24 10 false 3 5.479,1.073 5.896,1.313 0.417,0.24 10 false 3 5.479,0.688 5.896,0.927 0.417,0.24 10 false 4 4.135,0.302 4.552,0.542 0.417,0.24 10 false 4 1.583,0.292 2,0.531 0.417,0.24 10 false 4 1.583,0.677 2,0.917 0.417,0.24 10 false 5 4.135,0.677 4.552,0.917 0.417,0.24 10 false 5 4.135,1.083 4.552,1.323 0.417,0.24 10 false 6 1.583,1.073 2,1.313 0.417,0.24 10 false 6

CAUTION / NOTICE / HINT

NOTICE:
·

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

Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR SYSTEM>CALIBRATION

·

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



PROCEDURE

1.VEHICLE CONDITION AND WORK DETAILS CHECK
a.

Check the vehicle condition and work details.


Result:
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



A

2.CHECK CONNECTOR CONNECTION CONDITION (ULTRASONIC SENSOR)

B

GO TO CALIBRATION

Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR SYSTEM>CALIBRATION


2.CHECK CONNECTOR CONNECTION CONDITION (ULTRASONIC SENSOR)
a.

Check that the connector is properly connected to the front corner ultrasonic sensor and front center ultrasonic sensor.


Result:
Proceed to
NEXT



NEXT

3.CLEAR DTC
3.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
50002 438

Result:
Proceed to
NEXT



NEXT

4.CHECK FOR DTC
4.CHECK FOR DTC
a.

Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes
50001 438

Result:
Result Proceed to
DTCs are not output A
C1AE187 is output B
None of the above conditions are met C



A

END (CONNECTOR CONNECTION MALFUNCTION)

B

5.CHECK CONNECTOR CONNECTION CONDITION (CLEARANCE WARNING ECU ASSEMBLY)

C

GO TO DTC CHART

Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR SYSTEM>DIAGNOSTIC TROUBLE CODE CHART


5.CHECK CONNECTOR CONNECTION CONDITION (CLEARANCE WARNING ECU ASSEMBLY)
a.

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


Result:
Proceed to
NEXT



NEXT

6.CLEAR DTC
6.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
50002 438

Result:
Proceed to
NEXT



NEXT

7.CHECK FOR DTC
7.CHECK FOR DTC
a.

Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes
50001 438

Result:
Result Proceed to
DTCs are not output A
C1AE187 and C1AE487 are output B
C1AE487 is output C
Only C1AE187 is output D
None of the above conditions are met E



A

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

8.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT CORNER ULTRASONIC SENSOR [FL SENSOR])

C

GO TO DTC (C1AE487)

Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR SYSTEM>C1AE487


D

9.REPLACE FRONT CORNER ULTRASONIC SENSOR (FL SENSOR)

E

GO TO DTC CHART

Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR SYSTEM>DIAGNOSTIC TROUBLE CODE CHART


8.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT CORNER ULTRASONIC SENSOR [FL SENSOR])
a.

Disconnect the I24 clearance warning ECU assembly connector.


b.

Disconnect the B9 front corner ultrasonic sensor (FL sensor) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I24-2 (BOF) - B9-4 (BI) Always Below 1 Ω
I24-4 (SOF) - B9-5 (SI) Always Below 1 Ω
I24-3 (E5) - B9-6 (EI) Always Below 1 Ω
I24-2 (BOF) or B9-4 (BI) - Body ground Always 10 kΩ or higher
I24-4 (SOF) or B9-5 (SI) - Body ground Always 10 kΩ or higher
I24-3 (E5) or B9-6 (EI) - Body ground Always 10 kΩ or higher


Result:
Proceed to
OK
NG




OK

9.REPLACE FRONT CORNER ULTRASONIC SENSOR (FL SENSOR)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.REPLACE FRONT CORNER ULTRASONIC SENSOR (FL SENSOR)
a.

Replace the front corner ultrasonic sensor (FL sensor) with a known good one.

HINT:
·

Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>ULTRASONIC SENSOR (for Front)>REMOVAL

·

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.




Result:
Proceed to
NEXT



NEXT

10.CLEAR DTC
10.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Clearance Warning > Clear DTCs
50002 438

Result:
Proceed to
NEXT



NEXT

11.CHECK FOR DTC
11.CHECK FOR DTC
a.

Check for DTCs.

Body Electrical > Clearance Warning > Trouble Codes
50001 438

Result:
Result Proceed to
DTCs are not output A
C1AE187 is output B
None of the above conditions are met C



A

END (FRONT CORNER ULTRASONIC SENSOR [FL SENSOR] WAS DEFECTIVE)

B

REPLACE CLEARANCE WARNING ECU ASSEMBLY

Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>CLEARANCE WARNING ECU>REMOVAL


C

GO TO DTC CHART

Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR SYSTEM>DIAGNOSTIC TROUBLE CODE CHART