DTC C1621: Back Camera Power Supply Failure [10/2015 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2015 - ]

2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2015 - ]

   Result

   Result	Proceed to
   No DTC is output	A
   DTC is output (for Navigation Receiver Type)	B
   DTC is output (for Radio and Display Type)	C

Result:  1

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 08/2016]  Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 08/2017]  Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2017 - ] 

Result:  3

C 

See step  4

Result:  2

B 

See step  2

1. Disconnect the G153 navigation receiver assembly connector.
2. Disconnect the Z2 television camera assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G153-11 (CA+) - Z2-6 (CB+)	Always	Below 1 Ω
   G153-23 (CGND) - Z2-5 (CGND)	Always	Below 1 Ω
   G153-11 (CA+) - Body ground	Always	10 kΩ or higher
   G153-23 (CGND) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G153-23 (CGND) - Body ground	Always	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Navigation Receiver Assembly)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G153-11 (CA+) - Body ground	Ignition switch ACC	5.5 to 7.05 V

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE TELEVISION CAMERA ASSEMBLY. Refer to  REMOVAL [10/2015 - ] 

Result:  2

NG 

REPLACE NAVIGATION RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2015 - ] 

1. Disconnect the G175 radio and display receiver assembly connector.
2. Disconnect the Z2 television camera assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G175-11 (CA+) - Z2-6 (CB+)	Always	Below 1 Ω
   G175-23 (CGND) - Z2-5 (CGND)	Always	Below 1 Ω
   G175-11 (CA+) - Body ground	Always	10 kΩ or higher
   G175-23 (CGND) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  5

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G175-23 (CGND) - Body ground	Always	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Radio and Display Receiver Assembly)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G175-11 (CA+) - Body ground	Ignition switch ACC	5.5 to 7.05 V

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE TELEVISION CAMERA ASSEMBLY. Refer to  REMOVAL [10/2015 - ] 

Result:  2

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2015 - ]