AutoCodes – Generic – B1784

B1784 Code - Mirror Passenger Up Circuit Short To Battery

Quick Answer

The Body Control Module (BCM) monitors the Mirror Passenger Up Motor. Common causes include Faulty Mirror Passenger Up Motor, Mirror Passenger Up Motor harness is open or shorted, Mirror Passenger Up Motor 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: B1784 indicates Mirror Passenger Up Circuit Short To Battery.
Common causes: Common causes include Faulty Mirror Passenger Up Motor, Mirror Passenger Up Motor harness is open or shorted, Mirror Passenger Up Motor 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 4,455

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 Oct 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1784 Description

The Body Control Module (BCM) monitors the Mirror Passenger Up Motor. The BCM sets the OBDII code when the Mirror Passenger Up Motor is not to factory specifications.

OBDII Code B1784 - Mirror Passenger Up Circuit Short To Battery - AutoCodes.com — B1784 Code - Mirror Passenger Up Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC B1784?

Faulty Mirror Passenger Up Motor
Mirror Passenger Up Motor harness is open or shorted
Mirror Passenger Up Motor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1784?

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 B1784 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 B1784 code?

Need more information on how to fix the B1784 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1784 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 B1784 Code

1. What are the common symptoms of OBDII code B1784 (Mirror Passenger Up Circuit Short To Battery)?

- Common symptoms include the passenger side mirror being stuck in the up position, mirror movement being erratic, or the mirror not responding to adjustments.

2. What are the possible causes of OBDII code B1784?

- The code is typically caused by a short to battery in the wiring of the passenger side mirror circuit, a faulty mirror motor, or a malfunctioning mirror control switch.

3. How can I diagnose OBDII code B1784 at home?

- You can start by visually inspecting the wiring and connectors related to the passenger side mirror for any signs of damage. Using a multimeter to check for shorts in the circuit can also help pinpoint the issue.

4. Can a DIY enthusiast repair OBDII code B1784 themselves?

- Depending on your skill level and access to tools, it may be possible to repair this code at home by replacing the faulty mirror motor or repairing the wiring issue. However, if you are unsure, it's best to consult a professional mechanic.

5. Is it safe to drive with OBDII code B1784 present?

- While the code itself may not affect the drivability of the vehicle, having a malfunctioning passenger side mirror can compromise safety, especially during lane changes or parking. It is recommended to address the issue promptly.

6. What are the repair options for OBDII code B1784?

- Repair options include replacing the mirror motor, repairing the wiring short, or replacing the mirror control switch. A trained mechanic can diagnose the exact cause and recommend the best course of action.

7. Can resetting the OBDII system clear code B1784 temporarily?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It's essential to diagnose and fix the root cause of the problem.

8. Will disconnecting the battery reset OBDII code B1784?

- Disconnecting the battery may reset the code temporarily, but if the issue causing the code is not fixed, it will likely return once the system runs its diagnostic checks again.

9. Are there any preventive measures to avoid OBDII code B1784 in the future?

- Regularly inspecting the wiring and connectors related to the mirror system, avoiding excessive force when adjusting the mirrors, and addressing any mirror issues promptly can help prevent the recurrence of this code.

10. How long does it typically take to repair OBDII code B1784 at a repair shop?

- The repair time can vary depending on the exact cause of the code and the availability of parts. In most cases, a skilled mechanic can diagnose and repair the issue within a few hours to a day.