Lexus NX: Driver Side Camera Video Sync Signal Malfunction (C1686)
DESCRIPTION
This DTC is stored if the parking assist ECU judges as a result of its self check that a synchronization problem is occurring in the image signal sent from the driver side television camera assembly to the parking assist ECU.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1686 | Driver Side Camera Video Sync Signal Malfunction | Side camera feedback malfunction |
|
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.
Click here
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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.
Click here
PROCEDURE
| 1. | CHECK FOR DTC |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
OK:
DTC C1686 is not output.
| Result | Proceed to |
|---|---|
| OK | A |
| NG | B |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
|
.gif)
| 2. | CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - OUTER REAR VIEW MIRROR ASSEMBLY LH) |
(a) Disconnect the P45 parking assist ECU connector.
(b) Disconnect the M11*1 or M15*2 outer rear view mirror assembly LH connector.
- *1: w/o Seat Memory
- *2: w/ Seat Memory
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
w/o Seat Memory| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P45-12 (LCB+) - M11-5 (LCB+) | Always | Below 1 Ω |
| P45-10 (LCV+) - M11-6 (LCV+) | Always | Below 1 Ω |
| P45-34 (LCV-) - M11-14 (LCV-) | Always | Below 1 Ω |
| P45-35 (LGND) - M11-13 (LGND) | Always | Below 1 Ω |
| P45-12 (LCB+) or M11-5 (LCB+) - Body ground | Always | 10 kΩ or higher |
| P45-10 (LCV+) or M11-6 (LCV+) - Body ground | Always | 10 kΩ or higher |
| P45-34 (LCV-) or M11-14 (LCV-) - Body ground | Always | 10 kΩ or higher |
| P45-35 (LGND) or M11-13 (LGND) - Body ground | Always | 10 kΩ or higher |
| P45-35 (LGND) - Body ground | Always | 10 kΩ or higher |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| P45-12 (LCB+) - M15-2 (LCB+) | Always | Below 1 Ω |
| P45-10 (LCV+) - M15-7 (LCV+) | Always | Below 1 Ω |
| P45-34 (LCV-) - M15-6 (LCV-) | Always | Below 1 Ω |
| P45-35 (LGND) - M15-1 (LGND) | Always | Below 1 Ω |
| P45-12 (LCB+) or M15-2 (LCB+) - Body ground | Always | 10 kΩ or higher |
| P45-10 (LCV+) or M15-7 (LCV+) - Body ground | Always | 10 kΩ or higher |
| P45-34 (LCV-) or M15-6 (LCV-) - Body ground | Always | 10 kΩ or higher |
| P45-35 (LGND) or M15-1 (LGND) - Body ground | Always | 10 kΩ or higher |
| P45-35 (LGND) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK PARKING ASSIST ECU (LCV-, LGND) |
| (a) Disconnect the P45 parking assist ECU connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 35 (LGND) - Body ground | Always | Below 1 Ω |
| 34 (LCV-) - Body ground | Always | Below 1 Ω |
| NG | | REPLACE PARKING ASSIST ECU |
|
| 4. | CHECK PARKING ASSIST ECU (LCB+, LGND) |
| (a) Disconnect the outer rear view mirror assembly LH connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| P45-12 (LCB+) - P45-35 (LGND) | Power switch on (IG) | 5.5 to 7.05 V |
| P45-12 (LCB+) - P45-35 (LGND) | Power switch off | Below 1 V |
| NG | | REPLACE PARKING ASSIST ECU |
|
| 5. | CHECK SIDE TELEVISION CAMERA ASSEMBLY LH (LCV+, LGND) |
(a) Remove the parking assist ECU with the connector still connected.
(b) Using an oscilloscope, check the waveform of the side television camera assembly LH.
HINT:
A waterproof connector is used for the side television camera assembly LH. 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 side television camera assembly LH.
- The video waveform is constantly output when the power switch is on (ACC).
| Item | Content |
|---|---|
| Tester Connection | P45-10 (LCV+) - P45-35 (LGND) |
| 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 illustration.
| OK | | REPLACE PARKING ASSIST ECU |
|
| 6. | INSPECT OUTER MIRROR RETRACTOR LH |
| (a) Remove the outer mirror retractor LH. Click here |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
w/o Seat Memory| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A-1 (SCB+) - 5 (LCB+) | Always | Below 1 Ω |
| A-3 (SCV+) - 6 (LCV+) | Always | Below 1 Ω |
| A-7 (SCV-) - 14 (LCV-) | Always | Below 1 Ω |
| A-5 (SGND) - 13 (LGND) | Always | Below 1 Ω |
| A-1 (SCB+) or 5 (LCB+) - Body ground | Always | 10 kΩ or higher |
| A-3 (SCV+) or 6 (LCV+) - Body ground | Always | 10 kΩ or higher |
| A-7 (SCV-) or 14 (LCV-) - Body ground | Always | 10 kΩ or higher |
| A-5 (SGND) or 13 (LGND) - Body ground | Always | 10 kΩ or higher |
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A-1 (SCB+) - 2 (LCB+) | Always | Below 1 Ω |
| A-3 (SCV+) - 7 (LCV+) | Always | Below 1 Ω |
| A-7 (SCV-) - 6 (LCV-) | Always | Below 1 Ω |
| A-5 (SGND) - 1 (LGND) | Always | Below 1 Ω |
| A-1 (SCB+) or 2 (LCB+) - Body ground | Always | 10 kΩ or higher |
| A-3 (SCV+) or 7 (LCV+) - Body ground | Always | 10 kΩ or higher |
| A-7 (SCV-) or 6 (LCV-) - Body ground | Always | 10 kΩ or higher |
| A-5 (SGND) or 1 (LGND) - Body ground | Always | 10 kΩ or higher |
| NG | | REPLACE OUTER MIRROR RETRACTOR LH |
|
| 7. | CHECK SIDE TELEVISION CAMERA ASSEMBLY LH |
(a) Replace the side television camera assembly LH with a new or normally functioning one.
Click here
|
| 8. | CHECK FOR DTC |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
OK:
DTC C1686 is not output.
| OK | | END (SIDE TELEVISION CAMERA ASSEMBLY LH IS DEFECTIVE) |
| NG | | REPLACE PARKING ASSIST ECU |
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