Lexus NX: Display does not Dim when Light Control Switch is Turned ON
DESCRIPTION
If the navigation system is turned on with the light control switch in the tail or head position, before AVC-LAN communication is established, the multi-display assembly dims according to the illumination signal received via a direct line.
After AVC-LAN communication is established, the multi-display assembly dims the display according to a dimmer signal sent via AVC-LAN communication.
The radio receiver assembly changes the multi-display assembly between daytime mode and night mode according to the illumination signal input.
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuse for circuits related to this system before performing the following procedure.
HINT:
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.
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PROCEDURE
| 1. | CHECK SYMPTOMS |
(a) Check the symptoms that occur by viewing the display.
| Result | Proceed to |
|---|---|
| There is a delay in when the multi-display assembly dims after the navigation system is turned on with the light control switch in the tail or head position. | A |
| The multi-display assembly dims for a moment and then becomes bright after the navigation system is turned on with the light control switch in the tail or head position. | B |
| When the light control switch is in the tail or head position, the multi-display assembly dims but does not change to night mode. | |
| When the light control switch is in the tail or head position, the multi-display assembly neither dims nor switches to night mode. | C |
HINT:
- When the navigation system is activated with the light control switch in the tail or head position, before AVC-LAN communication is established, the multi-display assembly dims the display according to the illumination signal received via a direct line.
- After AVC-LAN communication is established, the multi-display assembly dims the display according to a dimmer signal sent via a direct line.
- The radio receiver assembly changes the multi-display assembly between daytime mode and night mode according to the illumination signal input.
| B | .gif) | GO TO STEP 3 |
| C | | GO TO LIGHTING SYSTEM |
|
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| 2. | CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT) |
| (a) Disconnect the multi-display assembly connector. |
|
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I42-13 (GND1) - Body ground | Always | Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I42-2 (ILL) - Body ground | Power switch on (IG) Light control switch in tail or head position | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 3. | CHECK IMAGE QUALITY SETTING |
(a) Turn the light control switch to the tail or head position.
(b) Check that daytime mode on the display adjustment screen is set to on.
| Result | Proceed to |
|---|---|
| Daytime mode is set to on. | A |
| Daytime mode is set to off. | B |
| A | | CHANGE DAYTIME MODE SETTING TO OFF |
|
| 4. | CHECK VEHICLE SIGNAL (OPERATION CHECK) |
| (a) Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check. Click here |
|
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(b) Check that the display for "TAIL" changes between ON and OFF according to the light control switch operation.
OK:
| Light Control Switch | Display |
|---|---|
| Tail or head | ON |
| Off or AUTO | OFF |
HINT:
- This display is updated once per second. As a result, it is normal for the display to lag behind the actual switch operation.
- Make sure to move the vehicle to a bright area before performing an operation check with the light control switch in the AUTO position.
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 5. | CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL CIRCUIT) |
(a) Disconnect the radio receiver assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I151-1 (GND1) - Body ground | Always | Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I152-15 (ILL+) - Body ground | Power switch on (IG) Light control switch in tail or head position | 11 to 14 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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