Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Voice Guidance does not Function

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 VOICE GUIDANCE SETTING

(a) Check that the voice guidance settings are not off.

OK:

Voice guidance settings are not off.

NG

CHANGE THE VOICE GUIDANCE SETTINGS TO ON

OK

2.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NAVIGATION ECU)

(a) Disconnect the J149 radio receiver assembly connector.

(b) Disconnect the J153 navigation ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J149-22 (SI+) - J153-6 (VOI+)

Always

Below 1 Ω

J149-23 (SI-) - J153-7 (VOI-)

Always

Below 1 Ω

J149-22 (SI+) or J153-6 (VOI+) - Body ground

Always

10 kΩ or higher

J149-23 (SI-) or J153-7 (VOI-) - Body ground

Always

10 kΩ or higher

J153-8 (SLD1) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK AUDIO FUNCTION

(a) Check that sound can be heard from a front speaker.

OK:

Sound can be heard.

OK

REPLACE NAVIGATION ECU

NG

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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