Rain Sensor LIN Communication Malfunction

NETWORKING: LIN COMMUNICATION SYSTEM: Rain Sensor LIN Communication Malfunction

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:





(e) Reconnect the R7 and R12 junction block connectors.
(f) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. REPLACE RAIN SENSOR
(a) Temporarily replace the rain sensor with a new one Removal.
(b) Check the rain sensor function is normal.
OK:
Rain sensor function is normal
NG -- REPLACE WINDSHIELD WIPER ECU
OK -- END (RAIN SENSOR IS DEFECTIVE)