Engine-Codes - Generic - B1578

B1578 Code - Lamp Park Input Circuit Short To Ground

- Code Popularity: 7,381 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code B1578?

  • Faulty Headlamp Switch
  • Headlamp Switch harness is open or shorted
  • Headlamp Switch circuit poor electrical connection
  • Faulty Smart Junction Box (SJB)

|How to Fix the B1578 Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the Cost to Diagnose the Code B1578?

Labor: 1.0

The cost to diagnose the B1578 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code B1578 Possible Symptoms?

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

|What Does the B1578 Code Mean?

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.

B1578 Code - Lamp Park Input Circuit Short To Ground

|Need more Information on the B1578 Code?

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

|Code B1578 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 B1578 Code?

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