DTC C1AEC: Front Sensor Communication Malfunction [08/2015 - ]: Procedure

1. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
3. Recheck for DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   Result

   Result	Proceed to
   DTC C1AEC is output	A
   No DTCs are output	B

B → See step   11 

A: Go to next step 

1. Disconnect the I82 connector from the clearance warning ECU assembly.
2. Disconnect the A5 connector from the No. 1 ultrasonic sensor.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I82-4 (BOF) - A5-1 (BI)	Always	Below 1 Ω
   I82-8 (SOF) - A5-3 (SI)
   I82-6 (E5) - A5-5 (EI)
   I82-4 (BOF) - Body ground		10 kΩ or higher
   I82-8 (SOF) - Body ground
   I82-6 (E5) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the A5 and A56 connectors from the No. 1 ultrasonic sensors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A5-2 (BO) - A56-1 (BI)	Always	Below 1 Ω
   A5-4 (SO) - A56-3 (SI)
   A5-6 (EO) - A56-5 (EI)
   A5-2 (BO) - Body ground		10 kΩ or higher
   A5-4 (SO) - Body ground
   A5-6 (EO) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the No. 1 ultrasonic sensor (front left sensor). Refer to REMOVAL [08/2015 - ] .
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

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

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   10 

OK: Go to next step 

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   Result

   Result	Proceed to
   DTC C1AEC is output	A
   No DTCs are output	B

B → END (FRONT LEFT SENSOR WAS DEFECTIVE) 

A: Go to next step 

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   Result

   Result	Proceed to
   DTC C1AEC is output	A
   No DTCs are output	B

B → END (FRONT RIGHT SENSOR WAS DEFECTIVE) 

A → See step   9