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Engine-Codes – Generic – B1819

B1819 Code - Wiper Rear Motor Up Relay Coil Circuit Open

Quick Answer

The diagnostic trouble code (DTC) B1819 indicates an issue with the rear wiper motor's relay coil circuit, specifically that the circuit is open. Common causes include A broken or frayed wire in the relay coil circuit, leading to an open circuit, A faulty relay that fails to close the circuit when activated, Corrosion or damage at the connectors or terminals associated with the rear wiper motor. 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
B1819 indicates Wiper Rear Motor Up Relay Coil Circuit Open.
Common causes
Common causes include A broken or frayed wire in the relay coil circuit, leading to an open circuit, A faulty relay that fails to close the circuit when activated, Corrosion or damage at the connectors or terminals associated with the rear wiper motor.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 21, 2024
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Code B1819 Description

The diagnostic trouble code (DTC) B1819 indicates an issue with the rear wiper motor's relay coil circuit, specifically that the circuit is open. This means that there is a break in the electrical pathway that prevents the relay from receiving the necessary signal to activate the rear wiper motor. The rear wiper is an essential component for maintaining visibility during inclement weather, especially in vehicles with hatchbacks or SUVs where rear visibility can be compromised by rain or snow accumulation.

OBDII Code B1819 - Wiper Rear Motor Up Relay Coil Circuit Open
B1819 Code - Wiper Rear Motor Up Relay Coil Circuit Open

Common Causes of B1819

  1. A broken or frayed wire in the relay coil circuit, leading to an open circuit.
  2. A faulty relay that fails to close the circuit when activated.
  3. Corrosion or damage at the connectors or terminals associated with the rear wiper motor.
  4. A malfunctioning body control module (BCM) that fails to send the correct signal to the relay.
  5. Water intrusion or moisture in the electrical components, causing short circuits or open circuits.

Symptoms of B1819

  1. Rear wiper motor does not operate when activated.
  2. Intermittent operation of the rear wiper, where it may work sporadically.
  3. Warning lights on the dashboard related to the vehicle's electrical system.
  4. Unusual noises from the rear wiper area when attempting to activate it.
  5. Possible issues with other electrical components, such as the front wipers or other accessories, due to shared circuits.

How to Fix B1819

  1. Visual Inspection: Begin by visually inspecting the wiring harness and connectors associated with the rear wiper motor and relay for any signs of damage, corrosion, or disconnection.
  2. Test the Relay: Use a multimeter to test the relay for continuity. If the relay is faulty, replace it with a new one.
  3. Check Wiring: Trace the wiring from the relay to the rear wiper motor for any breaks or shorts. Repair or replace any damaged wiring found during this inspection.
  4. Inspect the Body Control Module: If the relay and wiring are intact, use a diagnostic scanner to check the BCM for any fault codes or issues that may affect the rear wiper operation.
  5. Reassemble and Test: After making the necessary repairs, reassemble any components that were removed for inspection and test the rear wiper to ensure it operates correctly.

Cost to Fix B1819

The cost to repair a B1819 code can vary widely based on the specific issue identified during diagnosis. On average, repairs may range from $100 to $400, depending on whether it involves simple wiring repairs or the replacement of components like the relay or wiper motor. Labor costs typically fall between $80 and $150 per hour, with metropolitan areas or dealerships often charging higher rates. Independent shops may offer lower rates. It's advisable to obtain quotes from local repair shops for a more precise estimate tailored to your vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1819 Code

1. What are the common symptoms of OBDII code B1819?

- The common symptoms include the rear wiper motor not functioning, rear wiper not moving or stopping unexpectedly, and possibly a rear wiper that only works intermittently.

2. What can cause the OBDII code B1819 to trigger?

- The code B1819 is triggered when there is an open circuit detected in the rear wiper motor up relay coil circuit, indicating a problem with the electrical connection.

3. How can I diagnose the issue related to OBDII code B1819?

- To diagnose the issue, you can start by checking the wiring and connections related to the rear wiper motor up relay coil. Using a multimeter to test for continuity and inspecting for any visible damage can help pinpoint the problem.

4. Is it safe to continue driving with OBDII code B1819 triggered?

- While the vehicle may still be operable with the rear wiper malfunctioning, it is recommended to address the issue promptly to ensure proper functionality of the rear wiper system, especially in adverse weather conditions.

5. Can I repair OBDII code B1819 on my own?

- Repairing OBDII code B1819 may require some electrical knowledge and experience with automotive wiring. If you are comfortable working with electrical systems, you may be able to repair the issue yourself by fixing the open circuit in the rear wiper motor up relay coil circuit.

6. How much does it typically cost to repair OBDII code B1819 at a mechanic or dealership?

- The cost of repairing OBDII code B1819 can vary depending on the labor rates and parts required. It is advisable to contact a mechanic or dealership for an accurate estimate based on your specific vehicle and location.

7. Are there any preventive measures to avoid OBDII code B1819 in the future?

- Regularly inspecting and maintaining the rear wiper system, including checking the wiring and connections for any signs of wear or damage, can help prevent issues like OBDII code B1819 from occurring.

8. Can extreme weather conditions contribute to triggering OBDII code B1819?

- Yes, extreme weather conditions such as heavy rain, snow, or temperature fluctuations can potentially affect the electrical components of the rear wiper system and contribute to triggering OBDII code B1819.

9. Will resetting the OBDII code B1819 resolve the issue temporarily?

- Resetting the OBDII code B1819 may temporarily clear the error code, but if the underlying issue with the rear wiper motor up relay coil circuit is not addressed, the code is likely to reappear once the system detects the fault again.

10. Is it necessary to replace the rear wiper motor to fix OBDII code B1819?

- In some cases, the issue causing OBDII code B1819 may be resolved by repairing the open circuit in the rear wiper motor up relay coil circuit without needing to replace the entire rear wiper motor.

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