DTC B153A: GVIF Disconnected (from Extension Module to H/U) [06/2018 - 01/2019]: 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 t3 navigation ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Radio and Display Receiver Assembly)
   *b	Front view of wire harness connector (to Navigation ECU)

2. Disconnect the t4 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
   t3-1 (GVO-) - t4-1 (GV2-)	Always	Below 1 Ω
   t3-2 (GVO+) - t4-2 (GV2+)	Always	Below 1 Ω
   t3-3 (GVG1) - t4-3 (GVG2)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Replace the navigation ECU with a new one.

   Refer to REMOVAL [06/2018 - 03/2019]

   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 AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [06/2018 - 01/2019]