W/Harness Inspection

Front Area Module
B1907 Rain Sensor Fault 3 - W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Signal Circuit Inspection

Check FAM Input Signal (Rain sensor -> FAM)
1. IG KEY "ON" & "ENG "ON".
2. Turn the wiper switch to "AUTO".
3. Select "Oscilloscope" mode.
4. Connect prove A to signal terminal.
5. Check signal waveform on FAM signal input circuit (Rain sensor -> FAM).

Specification : Refer to "Signal Waveform & Data"




6. Is the signal waveform normal?





Check signal circuit open
1. IG KEY "OFF"
2. Disconnect FAM connector.
3. Disconnect the rain sensor connector.
4. Measure the resistance between both ends of signal circuit (Rain sensor -> FAM).

Specification : Approx. 0 Ohms




5. Is the measured value within specification?