Lexus NX: Main Switch Circuit
DESCRIPTION
The stereo component equalizer assembly detects vehicle sound switch signals.
The ASC system can be turned on and off by operating the vehicle sound switch.
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | READ VALUE USING TECHSTREAM |
(a) Using the Techstream, read the Data List.
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| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Volume SW | Vehicle sound switch on/off status | OFF or ON | OFF: Vehicle sound switch off ON: Vehicle sound switch on | - |
| Volume Switch Voltage | The VSLI terminal voltage to the CPU of the stereo compartment equalizer assembly | Min.: 0 V Max.: 5 V | Changes according to vehicle sound switch volume setting | - |
| Tester Display |
|---|
| Volume SW |
| Volume Switch Voltage |
OK:
The display is as specified in the normal condition column.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 2. | INSPECT VEHICLE SOUND SWITCH |
(a) Remove the vehicle sound switch.
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(b) Inspect the vehicle sound switch.
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| NG | | REPLACE VEHICLE SOUND SWITCH |
|
| 3. | CHECK HARNESS AND CONNECTOR (VEHICLE SOUND SWITCH - BATTERY) |
| (a) Disconnect the vehicle sound switch connector. |
|
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(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I114-8 (NVS) - Body ground | Power switch on (IG) | 11 to 14 V |
| I114-8 (NVS) - Body ground | Power switch off | Below 1 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (VEHICLE SOUND SWITCH - STEREO COMPONENT EQUALIZER ASSEMBLY) |
(a) Disconnect the I114 vehicle sound switch connector.
(b) Disconnect the I117 stereo component equalizer assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I114-3 (NVI) - I117-5 (VLSW) | Always | Below 1 Ω |
| I114-6 (NVM) - I117-14 (VSLI) | Always | Below 1 Ω |
| I114-3 (NVI) or I117-5 (VLSW) - Body ground | Always | 10 kΩ or higher |
| I114-6 (NVM) or I117-14 (VSLI) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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