AutoCodes – Generic – B1774

B1774 Code - Mirror Driver Up Circuit Open

Quick Answer

The Body Control Module (BCM) monitors the Mirror Driver Up Motor. Common causes include Faulty Mirror Driver Up Motor, Mirror Driver Up Motor harness is open or shorted, Mirror Driver 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: B1774 indicates Mirror Driver Up Circuit Open.
Common causes: Common causes include Faulty Mirror Driver Up Motor, Mirror Driver Up Motor harness is open or shorted, Mirror Driver 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 5,056

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 Jun 26, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1774 Description

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

OBDII Code B1774 - Mirror Driver Up Circuit Open - AutoCodes.com — B1774 Code - Mirror Driver Up Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1774?

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

How to Fix the DTC B1774?

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 B1774 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 B1774 code?

Need more information on how to fix the B1774 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1774 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1774 Lexus — Pressure Sensor Circuit Malfunction
B1774 Nissan — Storage Lid Status Sensor Left
B1774 Scion — Pressure Sensor Circuit Malfunction
B1774 Toyota — Pressure Sensor Circuit Malfunction

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 B1774 Code

1. What are the common symptoms of OBDII code B1774 Mirror Driver Up Circuit Open?

The common symptoms include the power mirror not adjusting or moving in the upward direction.

2. What are the possible causes of OBDII code B1774 Mirror Driver Up Circuit Open?

The code B1774 can be triggered by a faulty mirror switch, damaged wiring, or a malfunctioning power mirror motor.

3. How can I diagnose the OBDII code B1774 Mirror Driver Up Circuit Open?

Diagnosing this code involves checking the mirror switch for proper functionality, inspecting the wiring for any visible damage, and testing the power mirror motor for proper operation.

4. Can a blown fuse cause the OBDII code B1774 Mirror Driver Up Circuit Open?

Yes, a blown fuse related to the power mirror system can also trigger the B1774 code. Checking and replacing any blown fuses is recommended during the diagnostic process.

5. What repair tips can help resolve the OBDII code B1774 Mirror Driver Up Circuit Open?

Repair tips include checking and repairing any damaged wiring, replacing a faulty mirror switch, repairing or replacing the power mirror motor, and ensuring all connections are secure.

6. Is it safe to continue driving with the OBDII code B1774 Mirror Driver Up Circuit Open?

While the vehicle may still be operable with this code, it is recommended to address the issue promptly to avoid potential safety hazards or further damage to the power mirror system.

7. Can moisture or water ingress cause the OBDII code B1774 Mirror Driver Up Circuit Open?

Yes, moisture or water ingress into the power mirror components can lead to electrical issues, including triggering the B1774 code. Properly sealing the power mirror components can help prevent this.

8. How do I reset the OBDII code B1774 Mirror Driver Up Circuit Open after repairs?

After resolving the underlying issue causing the B1774 code, you can reset it using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the code.

9. Are there any recalls related to the OBDII code B1774 Mirror Driver Up Circuit Open?

Recalls specific to this code may vary by vehicle make and model. Checking with the manufacturer or authorized dealerships can provide information on any relevant recalls.

10. Can a DIY enthusiast without much automotive experience fix the OBDII code B1774 Mirror Driver Up Circuit Open?

DIY enthusiasts can attempt to diagnose and repair this code, especially if comfortable working with electrical components. However, if unsure, it is recommended to seek professional help to avoid causing further damage.