Engine-Codes - Generic - B1578

B1578 Code - Lamp Park Input Circuit Short To Ground

- Code Popularity: 9,257 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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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)
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How to Fix the DTC B1578?

Check 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 pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

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

What are Code 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 Code?

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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

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