Lexus NX: Voice Guidance does not Function

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the radio receiver assembly or navigation ECU, always replace it with a new one.

If a radio receiver assembly or navigation ECU which was installed to another vehicle is used, the following may occur:

  • A communication malfunction DTC may be stored.
  • The radio receiver assembly or navigation ECU may not operate normally.

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 I153 radio receiver assembly connector.

(b) Disconnect the I173 navigation ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I153-22 (SI+) - I173-6 (VOI+)

Always

Below 1 Ω

I153-23 (SI-) - I173-7 (VOI-)

Always

Below 1 Ω

I153-22 (SI+) or I173-6 (VOI+) - Body ground

Always

10 kΩ or higher

I153-23 (SI-) or I173-7 (VOI-) - Body ground

Always

10 kΩ or higher

I173-8 (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

READ NEXT:

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