| Last Modified: 11-27-2007 | 1.6 J | |
| Service Category: Power Source/Network | Section: Networking | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000003DGA001X |
| Title: NETWORKING: LIN COMMUNICATION SYSTEM: DESCRIPTION (2008 LX570) | ||
|
Rain Sensor LIN Communication Malfunction |
DESCRIPTION
The LIN communication of the components related to the rain sensor occurs between the rain sensor and windshield wiper ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When using the Techstream with the engine switch off to troubleshoot:
Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (RAIN SENSOR - WINDSHIELD WIPER ECU AND OVERHEAD JUNCTION BLOCK) |
(a) Disconnect the E90 ECU connector.
(b) Disconnect the R11 sensor connector.
(c) Disconnect the R7 and R12 junction block connectors.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R11-3 (MPX) - E90-7 (MPX1) |
Always |
Below 1 Ω |
|
R11-4 (SIG) - R7-8 (IG2) |
Always |
Below 1 Ω |
|
R11-1 (ES) - R12-19 (GND2) |
Always |
Below 1 Ω |
|
R11-3 (MPX) - Body ground |
Always |
10 kΩ or higher |
|
R11-4 (SIG) - Body ground |
Always |
10 kΩ or higher |
|
R11-1 (ES) - Body ground |
Always |
10 kΩ or higher |
(e) Reconnect the R7 and R12 junction block connectors.
(f) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
R11-4 (SIG) - Body ground |
Engine switch on (IG) |
11 to 14 V |
|
|
2. |
REPLACE RAIN SENSOR |
(a) Temporarily replace the rain sensor with a new one
.
(b) Check the rain sensor function is normal.
OK:
Rain sensor function is normal
|
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