- Open in CAN communication line (forward recognition camera - CAN junction connector)
- Open in CAN communication line (millimeter wave radar sensor assembly - CAN junction connector)
- CAN junction connector disconnected
- CAN junction connector
- Short in CAN communication line
- Open or short in forward recognition camera internal circuit
- Open or short in millimeter wave radar sensor assembly internal circuit
Lexus NX: Lost Communication with Cruise Control Front Distance Range Sensor Missing Message (U023587)
Lexus NX Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / Lost Communication with Cruise Control Front Distance Range Sensor Missing Message (U023587)
DESCRIPTION
The forward recognition camera is connected to the millimeter wave radar sensor assembly via the CAN communication line. When the signal from the millimeter wave radar sensor assembly is interrupted, the forward recognition camera outputs U023587.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U023587 | Lost Communication with Cruise Control Front Distance Range Sensor Missing Message | Once 3 seconds elapse after turning the power switch on (IG), a communication malfunction between the millimeter wave radar sensor assembly continues for approximately 2 seconds or more. |
|
| Pattern | DTC Location Name ( Techstream Displayed Name) | Suspected Area (Malfunction Status) | |
|---|---|---|---|
| Forward recognition camera (Pre-Collision System) | Millimeter wave radar sensor assembly (Front Radar Sensor) | ||
| U023587 | U010487 | ||
|
○: DTC is stored
-: DTC is not stored | |||
| Pattern 1 | ○ | ○ | |
| Pattern 2 | ○ | - |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
Click here
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- When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle and a DTC may be stored.
-
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the millimeter wave radar sensor beam axis must be performed.
Click here
- When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle and a DTC may be stored.
-
If the forward recognition camera has been replaced with a new one, forward recognition camera adjustment must be performed.
HINT:
Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.
One Time Recognition:
Click here
Sequential Recognition:
Click here
PROCEDURE
| 1. | CHECK FOR DTC |
(a) Read each DTC and check the diagnosis pattern using the table below.
Front Radar Sensor: Click here
Pre-Collision System: Click here
| Pattern | Display on Techstream / Output DTC | |
|---|---|---|
| Millimeter Wave Radar Sensor Assembly (Front Radar Sensor) | Forward Recognition Camera (Pre-Collision System) | |
| Pattern 1 | U010487 | U023587 |
| Pattern 2 | U010487 | - |
| Result | Proceed to |
|---|---|
| Pattern 1 | A |
| Pattern 2 | B |
| B | .gif) | REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
|
.gif)
| 2. | CHECK CAN MAIN WIRE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY CAN MAIN WIRE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the B10 millimeter wave radar sensor assembly connector.
| *a | Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly) | *b | DLC3 |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| B10-5 (CA1P) - B10-6 (CA1N) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω |
| B10-5 (CA1P) - I182-4 (CG) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher |
| B10-6 (CA1N) - I182-4 (CG) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher |
| B10-5 (CA1P) - I182-16 (BAT) | Cable disconnected from negative (-) auxiliary battery terminal | 6 kΩ or higher |
| B10-6 (CA1N) - I182-16 (BAT) | Cable disconnected from negative (-) auxiliary battery terminal | 6 kΩ or higher |
| NG | | GO TO STEP 4 |
|
| 3. | CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Replace the millimeter wave radar sensor assembly.
Click here
(b) Clear the DTCs.
Click here
(c) Make sure that the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(d) Recheck for DTCs and check that no DTCs are output.
Click here
OK:
DTC U010487 is not output.
| OK | | END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE) |
| NG | | REPLACE FORWARD RECOGNITION CAMERA |
| 4. | CHECK CAN MAIN WIRE (FORWARD RECOGNITION CAMERA CAN MAIN WIRE) |
(a) Reconnect the B10 millimeter wave radar sensor assembly connector.
(b) Disconnect the T18 forward recognition camera connector.
| *a | Front view of wire harness connector (to Forward Recognition Camera) | *b | DLC3 |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| T18-6 (CANH) - T18-12 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω |
| T18-6 (CANH) - I182-4 (CG) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher |
| T18-12 (CANL) - I182-4 (CG) | Cable disconnected from negative (-) auxiliary battery terminal | 200 Ω or higher |
| T18-6 (CANH) - I182-16 (BAT) | Cable disconnected from negative (-) auxiliary battery terminal | 6 kΩ or higher |
| T18-12 (CANL) - I182-16 (BAT) | Cable disconnected from negative (-) auxiliary battery terminal | 6 kΩ or higher |
| NG | | REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR |
|
| 5. | CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY |
(a) Replace the millimeter wave radar sensor assembly.
Click here
(b) Clear the DTCs.
Click here
(c) Make sure that the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(d) Recheck for DTCs and check that no DTCs are output.
Click here
OK:
DTC U010487 is not output.
| OK | | END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE) |
| NG | | REPLACE FORWARD RECOGNITION CAMERA |
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