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

Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual / Audio & Visual & Telematics / Navigation / Multi Info Display / Navigation System / Voice Guidance does not Function

WIRING DIAGRAM

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 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
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    "No GPS signal" mark is displayed
    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 Precau ...

    Voice is not Recognized
    PROCEDURE 1. CHECK CONDITION (a) While paying attention to the condition of the spoken voice command, perform a voice recognition operation. OK: Voice command is recognized normally. HINT: ...

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