DTC B153A: GVIF Disconnected (from Extension Module to H/U) [06/2018 - 09/2022]: Procedure

1. Clear the DTCs.

   Body Electrical > Navigation System > Clear DTCs 

2. Turn the engine switch off.
3. Turn the engine switch on (IG).
4. Press the "MAP" switch and check for DTCs.

   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 [06/2018 - ] 

Result: 

NG 

See step  2

1. Disconnect the I1 radio receiver assembly 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 Radio Receiver Assembly)

2. Disconnect the I2 navigation ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I1-1 (GVIF-) - I2-1 (GVIF-)	Always	Below 1 Ω
   I1-2 (GVIF+) - I2-2 (GVIF+)	Always	Below 1 Ω
   I1-3 (GND) - I2-3 (GND)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 NAVIGATION WIRE. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 09/2022] 

Result: 

OK 

See step  3

1. Replace the navigation ECU with a new or known good one.

   Refer to REMOVAL [06/2018 - 08/2020] , or refer to REMOVAL [08/2020 - 09/2022]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Clear the DTCs.

   Body Electrical > Navigation System > Clear DTCs 

2. Turn the engine switch off.
3. Turn the engine switch on (IG).
4. Press the "MAP" switch and check for DTCs.

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