OBD Guide
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B1509

Flash To Pass Switch Circuit Short To Battery

B1509 is an OBD-II diagnostic trouble code meaning: Flash To Pass Switch Circuit Short To Battery. Common causes: damage to the wires in the switch circuit, high beam switch malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Inability to turn on high beams
  • High beam turns on spontaneously
  • Flashing headlights
  • The malfunction indicator on the dashboard is on

Causes

  • Damage to the wires in the switch circuit
  • High beam switch malfunction
  • Short circuit in wiring harness
  • Problems with the lighting control unit

How to Fix

  1. Check the integrity of the wires in the switch circuit
  2. Test the high beam switch
  3. Inspect the wiring harness for damage
  4. Check the operation of the lighting control unit
  5. Replace faulty components

Related codes

B1510B1511U0100

FAQ

What does the B1509 code mean?

B1509 is an OBD-II diagnostic trouble code that indicates: Flash To Pass Switch Circuit Short To Battery

What causes a B1509 error code?

The most common causes of B1509 include: Damage to the wires in the switch circuit; High beam switch malfunction; Short circuit in wiring harness; Problems with the lighting control unit.

How do I fix a B1509 diagnostic trouble code?

To fix B1509: Check the integrity of the wires in the switch circuit. Test the high beam switch. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1509?

Do not drive — repair immediately

How much does it cost to fix B1509?

The estimated repair cost for B1509 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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