OBD Guide
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B1508

Flash To Pass Switch Circuit Open

B1508 is an OBD-II diagnostic trouble code meaning: Flash To Pass Switch Circuit Open. Common causes: blown fuse, broken or damaged wires in the harness. Estimated repair cost: $6–33.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • High beam flashing function does not work
  • The high beam warning lamp may not light up when trying to flash
  • Sometimes there are problems with other light control functions

Causes

  • Blown fuse
  • Broken or damaged wires in the harness
  • Oxidized or damaged contacts in the switch
  • 'Flash To Pass' switch faulty
  • Problems with the high beam control relay

How to Fix

  1. Check and, if necessary, replace the corresponding fuse
  2. Inspect the wiring harness for damage
  3. Check the condition of the contacts in the switch and control unit
  4. Test the 'Flash To Pass' switch with a multimeter
  5. Replace switch if necessary

Related codes

B1507B1509B1520

FAQ

What does the B1508 code mean?

B1508 is an OBD-II diagnostic trouble code that indicates: Flash To Pass Switch Circuit Open

What causes a B1508 error code?

The most common causes of B1508 include: Blown fuse; Broken or damaged wires in the harness; Oxidized or damaged contacts in the switch; 'Flash To Pass' switch faulty.

How do I fix a B1508 diagnostic trouble code?

To fix B1508: Check and, if necessary, replace the corresponding fuse. Inspect the wiring harness for damage. Check the condition of the contacts in the switch and control unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1508?

Limited driving only, diagnose soon

How much does it cost to fix B1508?

The estimated repair cost for B1508 is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat