DTC C1681: Front Camera Feedback Malfunction [12/2019 - 10/2022]: Procedure

1. Disconnect the H19 parking assist ECU connector.
2. Disconnect the B5 front television camera assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H19-15 (BCB+) - B5-6 (BCB+)	Always	Below 1 Ω
   H19-36 (BCV+) - B5-3 (BCV+)	Always	Below 1 Ω
   H19-13 (BCV-) - B5-2 (BCV-)	Always	Below 1 Ω
   H19-37 (BGND) - B5-5 (BGND)	Always	Below 1 Ω
   H19-14 (SGND) - Body ground	Always	10 kΩ or higher
   H19-15 (BCB+) or B5-6 (BCB+) - Body ground	Always	10 kΩ or higher
   H19-36 (BCV+) or B5-3 (BCV+) - Body ground	Always	10 kΩ or higher
   H19-13 (BCV-) or B5-2 (BCV-) - Body ground	Always	10 kΩ or higher
   H19-37 (BGND) or B5-5 (BGND) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Disconnect the H19 parking assist ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Parking Assist ECU)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   37 (BGND) - Body ground	Always	Below 1 Ω
   13 (BCV-) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

OK 

See step  3

1. Remove the parking assist ECU with the connector still connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Parking Assist ECU)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H19-37 (BGND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H19-15 (BCB+) - H19-37 (BGND)	Ignition switch ON	5.5 to 7.05 V
   H19-15 (BCB+) - H19-37 (BGND)	Ignition switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

OK 

See step  4

1. Remove the parking assist ECU with the connector still connected.
2. Using an oscilloscope, check the waveform of the front television camera assembly.

   HINT: 

   A waterproof connector is used for the front television camera assembly. Therefore, inspect the waveform at the parking assist ECU with the connector connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Parking Assist ECU)	*b	Waveform 1 (camera lens not covered, displaying an image)
   *c	Waveform 2 (camera lens covered, blacking out the screen)	*d	Synchronization Signal
   *e	Video Waveform	-	-

   HINT: 

   • The video waveform changes according to the image sent by the front television camera assembly.
   • The video waveform is constantly output when the ignition switch is turned to ACC.
   MEASUREMENT CONDITION
   
   

   Item	Content
   Terminal No. (Symbol)	H19-36 (BCV+) - H19-37 (BGND)
   Tool Setting	200 mV/DIV., 50 μsec./DIV.
   Condition	Ignition switch ON, panoramic view monitor system operating

   OK

   Waveform is similar to that shown in the illustration.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

NG 

REPLACE FRONT TELEVISION CAMERA ASSEMBLY. Refer to  REMOVAL [12/2019 - 11/2023]