Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: GVIF Disconnected (from Park Assist/Monitoring ECU to EMV/MM Integrated Device) (B1574)

DESCRIPTION

The multi-display assembly and parking assist ECU are connected via video signal (digital) lines.

This DTC is stored when a video signal (digital) line is disconnected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1574	GVIF Disconnected (from Park Assist/Monitoring ECU to EMV/MM Integrated Device)	GVIF disconnected (from parking assist ECU to multi-display assembly)	Harness or connector (GVIF cable) Multi-display assembly Parking assist ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced or operations that are performed during vehicle inspection or maintenance, calibration of other systems as well as the panoramic view monitor system may be needed.

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PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(b) Turn the engine switch off.

(c) Turn the engine switch on (IG).

(d) Change the shift position to R and check for DTCs.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

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2.	CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY ASSEMBLY - PARKING ASSIST ECU)

(a) Disconnect the J171 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)

(b) Disconnect the J172 parking assist ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
J172-2 (GVO-) - J171-2 (GVI-)	Always	Below 1 Ω
J172-1 (GVO+) - J171-1 (GVI+)	Always	Below 1 Ω
J172-3 (GVG1) - J171-3 (GVG1)	Always	Below 1 Ω
J172-2 (GVO-) or J171-2 (GVI-) - Body ground	Always	10 kΩ or higher
J172-1 (GVO+) or J171-1 (GVI+) - Body ground	Always	10 kΩ or higher
J172-3 (GVG1) or J171-3 (GVG1) - Body ground	Always	10 kΩ or higher

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REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	CHECK MULTI-DISPLAY ASSEMBLY

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

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(b) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(c) Turn the engine switch off.

(d) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

END (MULTI-DISPLAY ASSEMBLY IS DEFECTIVE)

NG

REPLACE PARKING ASSIST ECU