AVC-LAN Circuit [12/2019 - 10/2022]: Procedure

1. Choose the model to be inspected.

   Result

   Result	Proceed to
   For 8 Inch Display	A
   For 12.3 Inch Display	B

Result: 

B 

See step  5

Result: 

A 

See step  2

1. Remove the radio and display receiver assembly.

   Refer to REMOVAL [12/2019 - 10/2022]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Radio and Display Receiver Assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H1-19 (TX+) - H1-20 (TX-)	Always	60 to 80 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  3

1. Disconnect the H1 radio and display receiver assembly connector.
2. Disconnect the R16 television display assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R16-4 (TX+) - H1-19 (TX+)	Always	Below 1 Ω
   R16-5 (TX-) - H1-20 (TX-)	Always	Below 1 Ω
   R16-4 (TX+) or H1-19 (TX+) - Body ground	Always	10 kΩ or higher
   R16-5 (TX-) or H1-20 (TX-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect and reconnect each slave unit one by one until the master unit returns to normal operation.

   HINT: 

   • Check all slave units.
   • If disconnecting a slave unit causes the master unit to return to normal operation, the slave unit is defective and should be replaced.

   OK

   Master unit returns to normal operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MALFUNCTIONING PARTS 

Result: 

NG 

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

1. Remove the radio receiver assembly.

   Refer to REMOVAL [12/2019 - 10/2022]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Radio Receiver Assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H4-19 (TX+) - H4-20 (TX-)	Always	60 to 80 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  6

1. Disconnect the H4 radio receiver assembly connector.
2. Disconnect the R16 television display assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R16-4 (TX+) - H4-19 (TX+)	Always	Below 1 Ω
   R16-5 (TX-) - H4-20 (TX-)	Always	Below 1 Ω
   R16-4 (TX+) or H4-19 (TX+) - Body ground	Always	10 kΩ or higher
   R16-5 (TX-) or H4-20 (TX-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Disconnect and reconnect each slave unit one by one until the master unit returns to normal operation.

   HINT: 

   • Check all slave units.
   • If disconnecting a slave unit causes the master unit to return to normal operation, the slave unit is defective and should be replaced.

   OK

   Master unit returns to normal operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MALFUNCTIONING PARTS 

Result: 

NG 

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