U0178
NetworkModule Communicationlow severityLost Communication with Rain Sensor Module
What U0178 Means
Cannot communicate with the rain-sensing windshield wiper module.
Symptoms
- Auto wipers not working
- Rain sense feature disabled
- Wipers only work in manual mode
Common Causes
- Rain sensor failure
- Wiring issue
- Sensor not bonded to windshield
- Fuse blown
- Windshield replacement error
Diagnostic Steps
- Check rain sensor power
- Test wiring
- Verify sensor bonded to windshield properly
- Check fuse
- Inspect sensor gel pad
Where to start: Check sensor mounting gel pad on windshield. Must be rebonded during windshield replacement.
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