DTC B1574: GVIF Disconnected (from Park Assist/Monitoring ECU to EMV/MM Integrated Device) [12/2019 - 10/2022]: Procedure

1. Clear the DTCs.

   Body Electrical > Navigation System > Clear DTCs 

2. Change the shift position to R 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 [12/2019 - ] 

Result: 

NG 

See step  2

1. Disconnect the H104 multi-display assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Multi-display Assembly)
   *b	Front view of wire harness connector (to Parking Assist ECU)

2. Disconnect the H103 parking assist ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H104-2 (GV-) - H103-2 (GV-)	Always	Below 1 Ω
   H104-1 (GV+) - H103-1 (GV+)	Always	Below 1 Ω
   H104-3 (GND) - H103-3 (GND)	Always	Below 1 Ω
   H104-2 (GV-) or H103-2 (GV-) - Body ground	Always	10 kΩ or higher
   H104-1 (GV+) or H103-1 (GV+) - Body ground	Always	10 kΩ or higher
   H104-3 (GND) or H103-3 (GND) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Replace the multi-display assembly with a new or known good one.

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

2. Clear the DTCs.

   Body Electrical > Navigation System > Clear DTCs 

3. Change the shift position to R and check for DTCs.

   Body Electrical > Navigation System > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (MULTI-DISPLAY ASSEMBLY IS DEFECTIVE) 

Result: 

NG 

REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [12/2019 - 10/2022]