DTC C1621: Back Camera Power Supply Failure [06/2018 - 09/2022]: Procedure

1. Disconnect the G22 multi-display assembly connector.
2. Disconnect the T1 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
   G22-10 (CA+) - T1-6 (CB+)	Always	Below 1 Ω
   G22-21 (CGND) - T1-5 (CGND)	Always	Below 1 Ω
   G22-10 (CA+) or T1-6 (CB+) - Body ground	Always	10 kΩ or higher
   G22-21 (CGND) or T1-5 (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. Reconnect the G22 multi-display assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G22-21 (CGND) - Body ground	Always	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Multi-display Assembly)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   G22-10 (CA+) - G22-21 (CGND)	Engine switch on (ACC)	5.5 to 7.05 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE REAR TELEVISION CAMERA ASSEMBLY. Refer to  REMOVAL [06/2018 - 09/2022] 

Result: 

NG 

REPLACE MULTI-DISPLAY ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 09/2022]