Lexus NX: Image from Camera for Parking Assist Monitor is Abnormal
DESCRIPTION
The video signal from the rear television camera assembly is transmitted to the multi-display assembly.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
When the "!" mark is displayed on the multi-display assembly after disconnecting the cable from the negative (-) auxiliary battery terminal, correct the steering angle neutral point.
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Depending on the parts that are replaced or operations that are performed during vehicle inspection or maintenance, calibration of other systems as well as the parking assist monitor system may be needed.
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HINT:
Images may be unclear even in normal conditions if:- Electrical devices are used in the cabin (noise may occur in the image).
- Accessories that generate radio waves have been installed (noise may occur in the image).
- The camera lens is frosted over (the image immediately after turning the power switch on (IG) may be blurred or darker than normal).
- The camera lens is dirty with snow, mud, etc.
- A strong beam of light, such as a sunbeam or headlight, hits the camera.
- It is too dark around the camera (at night, etc.).
- The ambient temperature around the camera is either too high or too low.
- The vehicle is tilted at a steep angle.
- The rear television camera assembly lens is scratched.
- The rear television camera assembly lens has drops of water on it or the humidity is high.
- When the camera is used under fluorescent lights, sodium lights, mercury lights, etc., the lights and the illuminated area may appear to flicker.
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY ASSEMBLY - REAR TELEVISION CAMERA ASSEMBLY) |
(a) Disconnect the I42 multi-display assembly connector.
(b) Disconnect the Y25 rear television camera assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I42-10 (CA+) - Y25-6 (CB+) | Always | Below 1 Ω |
| I42-8 (V+) - Y25-3 (CV+) | Always | Below 1 Ω |
| I42-9 (V-) - Y25-2 (CV-) | Always | Below 1 Ω |
| I42-21 (CGND) - Y25-5 (CGND) | Always | Below 1 Ω |
| I42-10 (CA+) or Y25-6 (CB+) - Body ground | Always | 10 kΩ or higher |
| I42-8 (V+) or Y25-3 (CV+) - Body ground | Always | 10 kΩ or higher |
| I42-9 (V-) or Y25-2 (CV-) - Body ground | Always | 10 kΩ or higher |
| I42-21 (CGND) or Y25-5 (CGND) - Body ground | Always | 10 kΩ or higher |
| I42-20 (CSLD) - Body ground | Always | 10 kΩ or higher |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CHECK MULTI-DISPLAY ASSEMBLY (CGND, CA+) |
| (a) Disconnect the rear television camera assembly. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I42-21 (CGND) - 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 |
|---|---|---|
| I42-10 (CA+) - I42-21 (CGND) | Power switch on (ACC) | 5.5 to 7.05 V |
| I42-10 (CA+) - I42-21 (CGND) | Power switch off | Below 1 V |
| NG | | REPLACE MULTI-DISPLAY ASSEMBLY |
|
| 3. | CHECK REAR TELEVISION CAMERA ASSEMBLY |
(a) Remove the multi-display assembly with the connector still connected.
| *a | Component with harness connected (Multi-display Assembly) | *b | Waveform 1 |
| *c | Waveform 2 | *d | Synchronization Signal |
| *e | Video Waveform | - | - |
(b) Check the waveform of the rear television camera assembly using an oscilloscope.
HINT:
A waterproof connector is used for the rear television camera assembly. Therefore, inspect the waveform at the multi-display assembly with the connector connected.
| Item | Content |
|---|---|
| Terminal No. (Symbol) | I42-8 (V+) - I42-21 (CGND) |
| Tool Setting | 200 mV/DIV., 50 μsec./DIV. |
| Condition | Waveform 1: Power switch on (IG), shift lever in R, camera lens is not covered, displaying an image Waveform 2: Power switch on (IG), shift lever in R, camera lens is covered, blacking out the screen |
HINT:
The video waveform changes according to the image sent by the rear television camera assembly.
| Result | Proceed to |
|---|---|
| Waveform is as shown in the illustration | A |
| Waveform is not as shown in the illustration | B |
| B | | REPLACE REAR TELEVISION CAMERA ASSEMBLY |
|
| 4. | CHECK MULTI-DISPLAY ASSEMBLY |
(a) Replace the multi-display assembly with a new or normally functioning one.
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(b) Check if the same malfunction recurs when the parking assist monitor screen is displayed.
OK:
Malfunction does not reoccur (returns to normal).
| OK | | END (MULTI-DISPLAY ASSEMBLY IS DEFECTIVE) |
| NG | | REPLACE REAR TELEVISION CAMERA ASSEMBLY |
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