DTC B153A: GVIF Disconnected (from Extension Module to H/U) [11/2018 - 10/2022]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2018 - 10/2019] , or refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Clear DTCs 

2. Recheck for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [11/2018 - 10/2019] , or refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

NG 

See step  2

1. Disconnect the G120 navigation ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Navigation ECU)
   *b	Front view of wire harness connector (to No. 1 Navigation Wire)

2. Disconnect the A No. 1 navigation wire connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G120-1 (GVO-) - A-1 (GV2-)	Always	Below 1 Ω
   G120-2 (GVO+) - A-2 (GV2+)	Always	Below 1 Ω
   G120-3 (GVG1) - A-3 (GVG2)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 2 NAVIGATION WIRE. Refer to  REMOVAL [11/2018 - 10/2019]  , or refer to  REMOVAL [10/2019 - 10/2022] 

Result: 

OK 

See step  3

1. Disconnect the B No. 2 navigation wire connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 2 Navigation Wire)
   *b	Front view of wire harness connector (to Radio and Display Receiver Assembly)

2. Disconnect the G121 radio and display receiver assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B-1 (GVO-) - G121-1 (GV2-)	Always	Below 1 Ω
   B-2 (GVO+) - G121-2 (GV2+)	Always	Below 1 Ω
   B-3 (GVG1) - G121-3 (GVG2)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 NAVIGATION WIRE. Refer to  DISASSEMBLY [11/2018 - 12/2021]  , or refer to  DISASSEMBLY [12/2021 - 10/2022] 

Result: 

OK 

See step  4

1. Replace the navigation ECU with a new one.

   Refer to REMOVAL [11/2018 - 10/2019] , or refer to REMOVAL [10/2019 - 10/2022]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2018 - 10/2019] , or refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Clear DTCs 

2. Recheck for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [11/2018 - 10/2019] , or refer to DTC CHECK / CLEAR [10/2019 - 10/2022]

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (NAVIGATION ECU IS DEFECTIVE) 

Result: 

NG 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2018 - 10/2022]