Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: GVIF Disconnected (from Extension Module to H/U) (B153A)

DESCRIPTION

The radio receiver assembly and navigation 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
B153A	GVIF Disconnected (from Extension Module to H/U)	GVIF disconnected (from navigation ECU to radio receiver assembly)	No. 1 navigation wire Navigation ECU Radio receiver assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.

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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) Press the "MAP" switch 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 NO. 1 NAVIGATION WIRE (RADIO RECEIVER ASSEMBLY - NAVIGATION ECU)

(a) Disconnect the z31 radio receiver assembly connector.

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

(b) Disconnect the z32 navigation ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
z31-1 (GV2-) - z32-1 (GVO-)	Always	Below 1 Ω
z31-2 (GV2+) - z32-2 (GVO+)	Always	Below 1 Ω
z31-3 (GVG2) - z32-3 (GVG1)	Always	Below 1 Ω

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REPLACE NO. 1 NAVIGATION WIRE

OK

3.	REPLACE NAVIGATION ECU

(a) Replace the Navigation ECU with a new or known good one.

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NEXT

4.

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) Press the "MAP" switch and check for DTCs.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

END (NAVIGATION ECU IS DEFECTIVE)

NG

REPLACE RADIO RECEIVER ASSEMBLY