B370D Code - Rain Sensor Mode Control Circuit
Quick Answer
Ignition voltage is supplied to the windshield outside moisture sensor from the Body Control Module (BCM). Common causes include Faulty Windshield Outside Moisture Sensor (Rain Sensor), Windshield Outside Moisture Sensor harness is open or shorted, Windshield Outside Moisture Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B370D indicates Rain Sensor Mode Control Circuit.
- Common causes
- Common causes include Faulty Windshield Outside Moisture Sensor (Rain Sensor), Windshield Outside Moisture Sensor harness is open or shorted, Windshield Outside Moisture Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B370D Description
The windshield outside moisture sensor uses the moisture sensor signal 2 circuit to command wiper motor wipe cycles and to confirm the moisture sensor signal 1 is being received. If at anytime communication between the windshield outside moisture sensor and BCM is lost, the BCM will use the inputs from the windshield wiper/washer switch in the delay positions to operate the wiper motor at continuous variable delay intervals.
The Diagnostic Trouble Code (DTC) sets if an open, short to ground or a short to voltage has been detected on the moisture Sensor Signal 1 circuit.
What are the Possible Causes of the DTC B370D?
- Faulty Windshield Outside Moisture Sensor (Rain Sensor)
- Windshield Outside Moisture Sensor harness is open or shorted
- Windshield Outside Moisture Sensor circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B370D?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B370D code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- B370D Chevrolet — Rain Sensor Mode Control Circuit
- B370D Saturn — Rain Sensor Mode Control Circuit
Frequently Asked Questions about B370D Code
1. What are the common symptoms of OBDII code B370D (Rain Sensor Mode Control Circuit)?
- Common symptoms include the windshield wipers not operating in rain-sensing mode, erratic wiper behavior, or complete wiper failure.
2. What are possible causes of OBDII code B370D?
- Potential causes of this code include a faulty rain sensor, damaged wiring or connectors in the rain sensor circuit, or a malfunctioning control module.
3. How can I diagnose the issue related to OBDII code B370D?
- You can diagnose the problem by inspecting the rain sensor and its connections, testing the wiring for continuity, and using a scan tool to check for any fault codes stored in the system.
4. Can a DIY enthusiast repair OBDII code B370D at home?
- Depending on your automotive knowledge and skills, you may be able to repair this code at home by replacing the rain sensor, repairing damaged wiring, or resetting the control module.
5. Is it safe to drive with OBDII code B370D present?
- It is generally safe to drive with this code, but you may experience inconvenience due to the rain-sensing wipers not functioning correctly, especially during inclement weather.
6. How much does it typically cost to repair OBDII code B370D?
- The cost of repairing this code can vary depending on the specific issue, but it may range from $100 to $300 for parts and labor at a repair shop.
7. Can OBDII code B370D cause any other vehicle problems?
- While this code primarily affects the rain sensor function, it may also impact the overall windshield wiper system's performance and potentially lead to reduced visibility in rainy conditions.
8. What should I do if I encounter OBDII code B370D but don't have rain-sensing wipers?
- If your vehicle is not equipped with rain-sensing wipers, this code may indicate a different issue with the wiper system or control module that needs to be diagnosed and repaired.
9. Are there any preventive measures to avoid OBDII code B370D from recurring?
- Regularly inspecting and maintaining the rain sensor, keeping the windshield clean, and addressing any wiper system issues promptly can help prevent the recurrence of this code.
10. How long does it typically take to repair OBDII code B370D?
- The repair time for this code can vary depending on the complexity of the issue, but it may take anywhere from 1 to 3 hours at a repair shop, including diagnosis and repair.
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