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 | .gif) | CHANGE VOICE GUIDANCE SETTINGS TO ON |
|
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| 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 |
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| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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