AutoCodes – Generic – B1814

B1814 Code - Wiper Rear Motor Down Relay Coil Circuit Failure

Quick Answer

The Body Control Module (BCM) monitors the Wiper Rear Motor Down Relay. Common causes include Faulty Wiper Rear Motor Down Relay, Wiper Rear Motor Down Relay harness is open or shorted, Wiper Rear Motor Down Relay 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: B1814 indicates Wiper Rear Motor Down Relay Coil Circuit Failure.
Common causes: Common causes include Faulty Wiper Rear Motor Down Relay, Wiper Rear Motor Down Relay harness is open or shorted, Wiper Rear Motor Down Relay 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.

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Code Popularity 5,057

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 02, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1814 Description

The Body Control Module (BCM) monitors the Wiper Rear Motor Down Relay. The BCM sets the OBDII code when the Wiper Rear Motor Down Relay is not to factory specifications.

OBDII Code B1814 - Wiper Rear Motor Down Relay Coil Circuit Failure - AutoCodes.com — B1814 Code - Wiper Rear Motor Down Relay Coil Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1814?

Faulty Wiper Rear Motor Down Relay
Wiper Rear Motor Down Relay harness is open or shorted
Wiper Rear Motor Down Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1814?

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 B1814 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.

Need more information about the B1814 code?

Need more information on how to fix the B1814 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1814 code diagnosed by a professional: Find a repair shop in your area

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 B1814 Code

1. What does OBDII code B1814 mean?

B1814 indicates a failure in the rear wiper motor down relay coil circuit, meaning the relay responsible for moving the rear wiper to the down position is malfunctioning.

2. What are the common symptoms of code B1814?

Symptoms include the rear wiper not parking in the down position, wiper movement being erratic or stuck, or no response from the rear wiper at all.

3. What causes the B1814 code to appear?

Common causes include a faulty rear wiper motor, damaged relay, corroded or broken wiring, or a poor electrical connection in the circuit.

4. Can I still drive my vehicle with the B1814 code?

Yes, the code does not affect drivability, but it may limit rear visibility during adverse weather conditions, which can be a safety concern.

5. How can I diagnose code B1814?

Start by inspecting the rear wiper motor, relay, and associated wiring for damage or corrosion. Use a multimeter to test for continuity and proper voltage in the circuit.

6. How do I fix the B1814 code?

Repairs may involve replacing the faulty rear wiper relay, fixing damaged wiring, cleaning corroded connectors, or replacing the rear wiper motor if necessary.

7. How much does it cost to fix the B1814 code?

Repair costs can vary, typically ranging from $50 to $150 for a relay replacement, and up to $300 or more if the rear wiper motor needs replacing.

8. Can a blown fuse cause the B1814 code?

Yes, a blown fuse in the rear wiper circuit can disrupt power and trigger the code, so the fuses should be checked during diagnosis.

9. Will clearing the B1814 code with a scanner fix the issue?

Clearing the code may temporarily turn off the warning, but the underlying issue must be resolved to prevent the code from returning.

10. Can I repair the B1814 issue myself?

If you have basic auto repair skills and tools, you can inspect and replace the relay or wiring. For complex issues like motor replacement, professional help is recommended.