Lexus NX: Reverse Signal Circuit
DESCRIPTION
The multi-display receives a reverse signal from the BK UP LP relay*1 or clearance warning ECU assembly*2.
*1: except 10.3 Inch Display and w/ Intuitive Parking Assist System
*2: for 10.3 Inch Display and w/ Intuitive Parking Assist System
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
When "!" 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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PROCEDURE
| 1. | CHECK BACK-UP LIGHT |
(a) Check that the back-up light comes on.
OK:
The back-up light comes on.
| Result | Proceed to |
|---|---|
| OK (except 10.3 Inch Display and w/ Intuitive Parking Assist System) | A |
| OK (for 10.3 Inch Display and w/ Intuitive Parking Assist System) | B |
| NG | C |
| B | .gif) | GO TO STEP 3 |
| C | | GO TO LIGHTING SYSTEM (EXT) |
|
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| 2. | CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL) |
| (a) Disconnect the multi-display assembly connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I42-3 (REV) - Body ground | Power switch on (IG) Shift position in R | 11 to 14 V |
| I42-3 (REV) - Body ground | Power switch on (IG) Shift position not in R | Below 1 V |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 3. | CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL) |
| (a) Disconnect the clearance warning ECU assembly connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I20-28 (STP) - Body ground | Power switch on (IG) Shift position in R | 11 to 14 V |
| I20-28 (STP) - Body ground | Power switch on (IG) Shift position not in R | Below 1 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - MULTI-DISPLAY ASSEMBLY) |
(a) Disconnect the I20 clearance warning ECU assembly connector.
(b) Disconnect the I42 multi-display assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I20-31 (IND) - I42-14 (CSWA) | Always | Below 1 Ω |
| I20-31 (IND) or I42-14 (CSWA) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | INSPECT CLEARANCE WARNING ECU ASSEMBLY |
| (a) Disconnect the multi-display assembly connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I20-31 (IND) - Body ground | Power switch on (IG) Shift position in R | Below 3 V |
| I20-31 (IND) - Body ground | Power switch on (IG) Shift position not in R | 8 V or higher |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPLACE CLEARANCE WARNING ECU ASSEMBLY |
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