Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: "CHK" message(s) are displayed on the SIGNAL CHECK screen.
DESCRIPTION
On the SIGNAL CHECK screen, it is possible to check if the signals sent to the parking assist ECU are normal.
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HINT:
- On the SIGNAL CHECK screen, "OK" (blue) is displayed for items with a normal inspection result or input state.
- On the SIGNAL CHECK screen, "CHK" (red) is displayed for items with an abnormal inspection result or input state.
- Displayed items may differ depending on vehicle specifications.
| Item | Signal Input Method | Detail | DTC Output when Abnormal Result is Displayed | Signal Receiver |
|---|---|---|---|---|
| CAN | CAN communication | CAN communication signal | DTC is output | Related ECUs |
| SHIFT | Vehicle wire harness | Shift position switch signal | DTC is not output | Park/neutral position switch assembly |
| CAMERA SW | Vehicle wire harness | Panoramic view monitor switch signal input state | DTC is not output | Panoramic view monitor switch (Integration control and panel assembly) |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
When "!" is displayed on the multi-display assembly after the cable is disconnected from the negative (-) 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 DISPLAY CHECK MODE |
| (a) Check which items display on the signal check screen. |
|
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| Result | Proceed to |
|---|---|
| "CAMERA SW" displays "CHK" (red) | A |
| "CAN" displays "CHK" (red) | B |
| "SHIFT" displays "CHK" (red) | C |
| B |  | GO TO CAN COMMUNICATION SYSTEM |
| C | | GO TO STEP 4 |
|
| 2. | CHECK HARNESS AND CONNECTOR (PANORAMIC VIEW MONITOR SWITCH - PARKING ASSIST ECU AND BODY GROUND) |
(a) Disconnect the J84 panoramic view monitor switch connector.
(b) Disconnect the J159 parking assist ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J159-15 (BLSW) - J84-5 (D) | Always | Below 1 Ω |
| J84-17 (E) - Body ground | Always | Below 1 Ω |
| J159-15 (BLSW) or J84-5 (D) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | INSPECT PANORAMIC VIEW MONITOR SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) |
(a) Remove the panoramic view monitor switch (integration control and panel assembly).
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(b) Inspect the panoramic view monitor switch (integration control and panel assembly).
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| OK | | REPLACE PARKING ASSIST ECU |
| NG | | REPLACE PANORAMIC VIEW MONITOR SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) |
| 4. | CHECK BACK-UP LIGHT |
(a) Check that the back-up light comes on.
OK:
The back-up light comes on.
| NG | | GO TO LIGHTING SYSTEM (EXT) |
|
| 5. | CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL) |
| (a) Disconnect the J159 parking assist ECU connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J159-14 (REV) - Body ground | Engine switch on (IG), shift position in R | 11 to 14 V |
| J159-14 (REV) - Body ground | Engine switch on (IG), shift position not in R | Below 1 V |
| OK | | REPLACE PARKING ASSIST ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
CAN Communication Failure (Message Registry) (U1000)
DESCRIPTION If DTC U1000 is stored frequently, duplicate the problem symptoms and perform the inspection again even if the DTC is not output when rechecking for DTCs. DTC No. Detection Item DTC ...
ECU Power Source Circuit
DESCRIPTION This circuit is the power source circuit to operate the parking assist ECU. The parking assist ECU controls the panoramic view monitor system. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTIC ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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