DTC C1621: Back Camera Power Supply Failure [11/2018 - 10/2022]: Procedure

1. Disconnect the N24 parking assist ECU connector.
2. Disconnect the R15 television camera assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N24-33 (CB+) - R15-6 (CB+)	Always	Below 1 Ω
   N24-32 (CGND) - R15-5 (CGND)	Always	Below 1 Ω
   N24-33 (CB+) or R15-6 (CB+) - Body ground	Always	10 kΩ or higher
   N24-32 (CGND) or R15-5 (CGND) - 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. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Parking Assist ECU)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N24-32 (CGND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   N24-33 (CB+) - N24-32 (CGND)	Power switch on (IG)	5.5 to 7.05 V
   N24-33 (CB+) - N24-32 (CGND)	Power switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TELEVISION CAMERA ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

Result: 

NG 

REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [11/2018 - 10/2022]