DTC C1621: Back Camera Power Supply Failure [12/2019 - 10/2022]: Procedure

1. Disconnect the H2 radio and display receiver assembly connector.
2. Disconnect the W15 rear television camera assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H2-30 (CA+) - W15-6 (CB+)	Always	Below 1 Ω
   H2-27 (CGND) - W15-5 (CGND)	Always	Below 1 Ω
   H2-30 (CA+) or W15-6 (CB+) - Body ground	Always	10 kΩ or higher
   H2-27 (CGND) or W15-5 (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. Disconnect the W15 rear television camera assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component with harness connected (Radio and Display Receiver Assembly)

   -

   -

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H2-27 (CGND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   H2-30 (CA+) - H2-27 (CGND)	Ignition switch ACC	5.5 to 7.05 V
   H2-30 (CA+) - H2-27 (CGND)	Ignition switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]