AutoCodes – Generic – B1978

B1978 Code - Passengers Front Seat Down Switch Circuit Short To Battery

Quick Answer

The Body Control Module (BCM) monitors the Passengers Front Seat Down Switch. Common causes include Faulty Passengers Front Seat Down Switch, Passengers Front Seat Down Switch harness is open or shorted, Passengers Front Seat Down Switch 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: B1978 indicates Passengers Front Seat Down Switch Circuit Short To Battery.
Common causes: Common causes include Faulty Passengers Front Seat Down Switch, Passengers Front Seat Down Switch harness is open or shorted, Passengers Front Seat Down Switch 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 6,765

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 31, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1978 Description

The Body Control Module (BCM) monitors the Passengers Front Seat Down Switch. The BCM sets the OBDII code when the Passengers Front Seat Down Switch is not to factory specifications.

OBDII Code B1978 - Passengers Front Seat Down Switch Circuit Short To Battery - AutoCodes.com — B1978 Code - Passengers Front Seat Down Switch Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC B1978?

Faulty Passengers Front Seat Down Switch
Passengers Front Seat Down Switch harness is open or shorted
Passengers Front Seat Down Switch circuit poor electrical connection

How to Fix the DTC B1978?

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 B1978 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 B1978 code?

Need more information on how to fix the B1978 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1978 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1978 Chrysler — Power Liftgate Close Direction Sector Switch Performance
B1978 Dodge — Power Liftgate Close Direction Sector Switch Performance
B1978 Jeep — Power Liftgate Close Direction Sector Switch Performance
B1978 RAM — Power Liftgate Close Direction Sector Switch Performance

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 B1978 Code

1. What are common symptoms of OBDII code B1978?

- Common symptoms include the passengers front seat down switch not functioning properly, the seat not moving as intended, or a warning light on the dashboard.

2. What causes the OBDII code B1978 Passengers Front Seat Down Switch Circuit Short To Battery?

- This code is typically triggered by a short circuit in the wiring of the passengers front seat down switch, leading to a connection to the battery.

3. How can I diagnose the issue related to code B1978?

- You can diagnose the issue by inspecting the wiring and connections related to the passengers front seat down switch, checking for any visible damage or short circuits.

4. Can I repair the Passengers Front Seat Down Switch Circuit Short To Battery issue myself?

- If you have experience with automotive electrical systems, you may be able to repair the issue yourself by repairing or replacing the damaged wiring or connections.

5. Is it safe to drive with OBDII code B1978 active?

- It is generally not recommended to drive with this code active, as it can affect the functionality of the passengers front seat and potentially cause further electrical issues.

6. Are there any temporary solutions to consider for code B1978?

- Disconnecting the battery to reset the system temporarily may help clear the code, but it is important to address the underlying issue to prevent future problems.

7. How much does it typically cost to repair OBDII code B1978?

- The cost of repairing this code can vary depending on the extent of the damage and whether you choose to do the repairs yourself or take your vehicle to a professional mechanic.

8. Will resetting the OBDII system clear the B1978 code?

- 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.

9. Can OBDII code B1978 affect other systems in the vehicle?

- While this code specifically relates to the passengers front seat down switch circuit, electrical issues in one part of the vehicle can sometimes impact other systems, so it's important to address the problem promptly.

10. How can I prevent OBDII code B1978 from occurring in the future?

- Regularly inspecting the wiring and connections related to the passengers front seat down switch, and addressing any damage or wear promptly, can help prevent this code from occurring.