Lexus NX: Rain Sensor LIN Communication Malfunction
DESCRIPTION
A malfunction occurs in LIN communication of the components related to the rain sensor between the rain sensor and windshield wiper relay assembly.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
When using the Techstream with the power switch off to troubleshoot:
Connect the Techstream to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (RAIN SENSOR - WINDSHIELD WIPER RELAY ASSEMBLY) |
(a) Disconnect the I56 windshield wiper relay assembly connector.
(b) Disconnect the T8 rain sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I56-14 (MPX1) - T8-1 (MPX) | Always | Below 1 Ω |
| I56-14 (MPX1) - Body ground | Always | 10 kΩ or higher |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - BATTERY AND BODY GROUND) |
| *a | Front view wire harness connector (to Windshield Wiper Relay Assembly) |
(a) Disconnect the windshield wiper relay assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I56-12 (E) - Body ground | Always | Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I56-2 (IG) - Body ground | Power switch on (IG) | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK WINDSHIELD WIPER RELAY ASSEMBLY |
(a) Temporarily replace the windshield wiper relay assembly with a new or normally functioning one.
Click here .gif)
(b) Check the rain sensor function.
Click here
| Rain sensor function is normal | | END (WINDSHIELD WIPER RELAY ASSEMBLY IS DEFECTIVE) |
| Rain sensor function is not normal | | REPLACE RAIN SENSOR |
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