DTC B1574: GVIF Disconnected (from Park Assist/Monitoring ECU to EMV/MM Integrated Device) [06/2018 - 09/2022]: Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2022 Lexus ES 350, 2022 Lexus ES 250, 2021 Lexus ES 350, 2021 Lexus ES 250, and 2020 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK DTC
- Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs
- Turn the engine switch off.
- Turn the engine switch on (IG).
- 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 [06/2018 - ]
Result:
NG
See step 2
- Clear the DTCs.
- CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY ASSEMBLY - PARKING ASSIST ECU)
- Disconnect the G100 multi-display assembly connector.
*a Front view of wire harness connector
(to Multi-display Assembly)*b Front view of wire harness connector
(to Parking Assist ECU) - Disconnect the N108 parking assist ECU connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition N108-2 (GV-) - G100-2 (GV-) Always Below 1 Ω N108-1 (GV+) - G100-1 (GV+) Always Below 1 Ω N108-3 (GND) - G100-3 (GND) Always Below 1 Ω N108-2 (GV-) or G100-2 (GV-) - Body ground Always 10 kΩ or higher N108-1 (GV+) or G100-1 (GV+) - Body ground Always 10 kΩ or higher N108-3 (GND) or G100-3 (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
- Disconnect the G100 multi-display assembly connector.
- CHECK MULTI-DISPLAY ASSEMBLY
- Replace the multi-display assembly with a new or known good one.
Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - ]
- Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs
- Turn the engine switch off.
- 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 [06/2018 - 09/2022]
- Replace the multi-display assembly with a new or known good one.