AutoCodes – Nissan – B1778 Nissan

B1778 Nissan Code - Trunk Open Output Signal

Quick Answer

The Soft Top Control Unit sets the OBDII code when the Trunk Open Output Signal circuit is open, short to ground or short to power. Common causes include Faulty Trunk Lid Lock Assembly, Trunk Lid Lock Assembly harness is open or shorted, Trunk Lid Lock Assembly 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: B1778 Nissan indicates Trunk Open Output Signal.
Common causes: Common causes include Faulty Trunk Lid Lock Assembly, Trunk Lid Lock Assembly harness is open or shorted, Trunk Lid Lock Assembly 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 1,402

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 27, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1778 Nissan Description

The Soft Top Control Unit sets the OBDII code when the Trunk Open Output Signal circuit is open, short to ground or short to power.

OBDII Code B1778 Nissan - Trunk Open Output Signal - AutoCodes.com — B1778 Nissan Code - Trunk Open Output Signal

What does this mean?

What are the Possible Causes of the DTC B1778 Nissan?

Faulty Trunk Lid Lock Assembly
Trunk Lid Lock Assembly harness is open or shorted
Trunk Lid Lock Assembly circuit poor electrical connection

How to Fix the DTC B1778 Nissan?

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 B1778 Nissan 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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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 B1778 Nissan Code

1. What are the common symptoms of OBDII code B1778 in a Nissan related to the Trunk Open Output Signal?

- Common symptoms include the trunk not opening when requested, false trunk open warnings on the dashboard, and malfunctioning trunk release buttons.

2. What are the possible causes of OBDII code B1778 in a Nissan indicating a Trunk Open Output Signal issue?

- The code can be triggered by a faulty trunk open switch, damaged wiring in the trunk release circuit, or a malfunctioning trunk control module.

3. How can I diagnose the cause of OBDII code B1778 in my Nissan related to the Trunk Open Output Signal?

- To diagnose the issue, start by checking the trunk open switch for proper functionality, inspecting the wiring for any visible damage, and using a diagnostic tool to scan the trunk control module for error codes.

4. Are there any simple repair tips for fixing OBDII code B1778 in a Nissan associated with the Trunk Open Output Signal?

- You can try cleaning the trunk open switch contacts, repairing any damaged wiring, or resetting the trunk control module by disconnecting the car battery for a few minutes.

5. Can a malfunctioning trunk open signal affect other systems in the vehicle when OBDII code B1778 is present in a Nissan?

- Yes, a faulty trunk open signal can impact the overall convenience and security of the vehicle, as well as trigger false warning messages that may distract the driver.

6. Is it safe to continue driving with OBDII code B1778 related to the Trunk Open Output Signal illuminated in a Nissan?

- While the vehicle should still be operable, it is recommended to address the issue promptly to avoid potential inconvenience or safety concerns associated with a malfunctioning trunk release system.

7. How much does it typically cost to repair OBDII code B1778 in a Nissan due to a Trunk Open Output Signal problem?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from a simple DIY fix to a more involved repair at a dealership or repair shop.

8. Can resetting the vehicle's computer system clear OBDII code B1778 related to the Trunk Open Output Signal in a Nissan?

- Resetting the computer system may temporarily clear the code, but if the underlying issue causing the Trunk Open Output Signal problem is not resolved, the code is likely to reappear.

9. Are there any recalls or technical service bulletins related to OBDII code B1778 in Nissan vehicles concerning the Trunk Open Output Signal issue?

- It's recommended to check with Nissan dealerships or online resources for any recalls or technical service bulletins specific to OBDII code B1778 and the Trunk Open Output Signal problem in Nissan vehicles.

10. Can extreme weather conditions or environmental factors cause OBDII code B1778 to trigger in a Nissan due to a Trunk Open Output Signal issue?

- Yes, extreme temperatures, moisture, or debris in the trunk area can potentially affect the trunk open signal system and lead to the triggering of OBDII code B1778 in a Nissan.