Lexus NX: Open or Short Circuit in Back Camera Signal (C1622)
DESCRIPTION
This DTC is stored if the parking assist ECU judges as a result of its self check that the signals or signal lines between the parking assist ECU and the rear television camera assembly are not normal.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1622 | Open or Short Circuit in Back Camera Signal | Open or short in the rear television camera signal circuit |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
When "!" mark is displayed on the multi-display assembly after the cable is disconnected 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 panoramic view monitor system may be needed.
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - REAR TELEVISION CAMERA ASSEMBLY) |
(a) Disconnect the P45 parking assist ECU 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 |
|---|---|---|
| P45-33 (CB+) - Y25-6 (CB+) | Always | Below 1 Ω |
| P45-29 (CV+) - Y25-3 (CV+) | Always | Below 1 Ω |
| P45-30 (CV-) - Y25-2 (CV-) | Always | Below 1 Ω |
| P45-32 (CGND) - Y25-5 (CGND) | Always | Below 1 Ω |
| P45-31 (SGND) - Body ground | Always | Below 1 Ω |
| P45-33 (CB+) or Y25-6 (CB+) - Body ground | Always | 10 kΩ or higher |
| P45-29 (CV+) or Y25-3 (CV+) - Body ground | Always | 10 kΩ or higher |
| P45-30 (CV-) or Y25-2 (CV-) - Body ground | Always | 10 kΩ or higher |
| P45-32 (CGND) or Y25-5 (CGND) - Body ground | Always | 10 kΩ or higher |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CHECK PARKING ASSIST ECU (CV-, CGND) |
| (a) Disconnect the parking assist ECU connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 30 (CV-) - Body ground | Always | Below 1 Ω |
| 32 (CGND) - Body ground | Always | Below 1 Ω |
| NG | | REPLACE PARKING ASSIST ECU |
|
| 3. | CHECK PARKING ASSIST ECU (CB+, CGND) |
| (a) Disconnect the rear television camera assembly. |
|
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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 |
|---|---|---|
| P45-33 (CB+) - P45-32 (CGND) | Power switch on (IG) | 5.5 to 7.05 V |
| P45-33 (CB+) - P45-32 (CGND) | Power switch off | Below 1 V |
| NG | | REPLACE PARKING ASSIST ECU |
|
| 4. | CHECK REAR TELEVISION CAMERA ASSEMBLY (CV+, CGND) |
(a) Remove the parking assist ECU with the connector still connected.
(b) Using an oscilloscope, check the waveform of the rear television camera assembly.
HINT:
A waterproof connector is used for the rear television camera assembly. Therefore, inspect the waveform at the parking assist ECU with the connector connected.
| *a | Component with harness connected (Parking Assist ECU) | *b | Waveform 1 (camera lens not covered, displaying an image) |
| *c | Waveform 2 (camera lens covered, blacking out the screen) | *d | Synchronization Signal |
| *e | Video Waveform | - | - |
HINT:
- The video waveform changes according to the image sent by the rear television camera assembly.
- The video waveform is constantly output when the power switch is on (ACC).
| Item | Content |
|---|---|
| Terminal No. (Symbol) | P45-29 (CV+) - P45-32 (CGND) |
| Tool Setting | 200 mV/DIV., 50 μsec./DIV. |
| Condition | Power switch on (IG), panoramic view monitor switch on |
OK:
Waveform is similar to that shown in the illustration.
| OK | | REPLACE PARKING ASSIST ECU |
| NG | | REPLACE REAR TELEVISION CAMERA ASSEMBLY |
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Inspection
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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 te
