AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Generic - B1578

B1578 Code - Lamp Park Input Circuit Short To Ground

- Code Popularity: 9,256 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC B1578?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Headlamp Switch
  • Headlamp Switch harness is open or shorted
  • Headlamp Switch circuit poor electrical connection
  • Faulty Smart Junction Box (SJB)
⚠ Does your Car have Safety Recalls? → Check here

How to Fix the DTC B1578?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for B1578 Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1578 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code B1578 Description

The Smart Junction Box (SJB) monitors the parking lamp request input from the headlamp switch. The SJB provides a ground for the parking lamp relay coil (integrated into the SJB ) when a request for the parking lamps is received. When the parking lamp relay is energized, voltage is routed to the rear and front parking lamps. The Diagnostic Trouble Code (DTC) sets when the SJB detects a short to ground from the parking lamps on input circuit.

OBDII Code B1578 - Lamp Park Input Circuit Short To Ground - AutoCodes.com
B1578 Code - Lamp Park Input Circuit Short To Ground

Need More Information on the Code?

Need more information on how to fix the B1578 code? Get Access to Factory Service Manuals

Information for Specific Makes

  • B1578 Chrysler Audio Antenna Circuit Resistance Below Threshold
  • B1578 Dodge Audio Antenna Circuit Resistance Below Threshold
  • B1578 Ford Lamp Park Input Circuit Short To Ground
  • B1578 Jeep Audio Antenna Circuit Resistance Below Threshold
  • B1578 Lincoln Lamp Park Input Circuit Short To Ground
  • B1578 Mercury Lamp Park Input Circuit Short To Ground
  • B1578 RAM Audio Antenna Circuit Resistance Below Threshold

Need Help with the Code?

Get the B1578 code diagnosed by a professional: Find a repair shop in your area

Code B1578 comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the B1578 code? Have you replaced any parts?
Any information is appreciated. Thanks