AutoCodes – Jeep – B1478 Jeep

B1478 Jeep Code - Channel 5 Audio Speaker Output Circuit Shorted Together

Quick Answer

The standard equipment speaker system includes four full-range speakers. Common causes include Faulty Audio Amplifier, Audio Amplifier harness is open or shorted, Audio Amplifier 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: B1478 Jeep indicates Channel 5 Audio Speaker Output Circuit Shorted Together.
Common causes: Common causes include Faulty Audio Amplifier, Audio Amplifier harness is open or shorted, Audio Amplifier 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 1,086

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 Apr 12, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1478 Jeep Description

The standard equipment speaker system includes four full-range speakers. The two front speakers are mounted behind a removable bezel located on each outboard end of the lower instrument panel. With the premium speaker system, the standard front speakers are replace with an enclosure assembly that includes a 4 inch speaker and a 1 inch tweeter. The four rear speakers are mounted behind a grille located on each outboard end of the sport bar, above the rear seating area of the vehicle. This Diagnostic Trouble Code (DTC) sets if a Direct Current (DC) offset occurs on the output channel, the amplifier shall set a DTC after a maturity rate of four to six seconds.

OBDII Code B1478 Jeep - Channel 5 Audio Speaker Output Circuit Shorted Together - AutoCodes.com — B1478 Jeep Code - Channel 5 Audio Speaker Output Circuit Shorted Together

What does this mean?

What are the Possible Causes of the DTC B1478 Jeep?

Faulty Audio Amplifier
Audio Amplifier harness is open or shorted
Audio Amplifier circuit poor electrical connection

How to Fix the DTC B1478 Jeep?

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 B1478 Jeep 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 B1478 Jeep Code

1. What does the OBDII code B1478 mean on a Jeep?

B1478 indicates that the Channel 5 Audio Speaker Output Circuit has a short, meaning there is an electrical issue causing two wires or components in the circuit to improperly connect.

2. What are the common symptoms of the B1478 code?

Symptoms may include distorted or no sound from one or more speakers, intermittent audio output, or static noise from the speaker system.

3. What causes the B1478 code to trigger?

The most common causes are damaged speaker wiring, a shorted speaker, or a fault in the audio amplifier or head unit.

4. Can a blown speaker cause the B1478 code?

Yes, a blown speaker with an internal short can cause the circuit to malfunction and trigger this code.

5. How do I diagnose the B1478 code?

Check the speaker wiring for damage or shorts, inspect the speaker for internal faults, and test the audio amplifier and head unit for proper operation.

6. Can I still drive with the B1478 code?

Yes, the code does not affect vehicle drivability, but it may impair audio system functionality and should be addressed to restore sound quality.

7. How can I fix the B1478 code on my Jeep?

Repairs may include replacing damaged wires, repairing or replacing the faulty speaker, or servicing the audio amplifier or head unit if they are defective.

8. How much does it cost to fix the B1478 code?

Repair costs vary but can range from $50 for simple wiring repairs to $500 or more if the audio amplifier or head unit needs replacement.

9. Can I clear the B1478 code without fixing the issue?

Clearing the code without addressing the root cause may result in the code returning and continued audio issues.

10. Is it possible for the B1478 code to be a false trigger?

While rare, software glitches in the audio system or diagnostic tool errors could cause a false trigger, but the circuit should still be inspected for issues.