OBD Guide
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B1279

Dimmer Switch Circuit Malfunction

B1279 is an OBD-II diagnostic trouble code meaning: Dimmer Switch Circuit Malfunction. Common causes: brightness switch malfunction, open or short circuit in wiring harness. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • Dashboard backlight brightness adjustment does not work
  • Dashboard light does not turn on
  • Backlight flashing when the regulator is operating

Causes

  • Brightness switch malfunction
  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • Blown fuse

How to Fix

  1. Check the fuse associated with the backlight circuit
  2. Inspect the wiring harness for damage
  3. Check the operation of the brightness switch
  4. Clean contacts in connectors
  5. Replace switch or wiring harness if necessary

Related codes

B1278B1280

FAQ

What does the B1279 code mean?

B1279 is an OBD-II diagnostic trouble code that indicates: Dimmer Switch Circuit Malfunction

What causes a B1279 error code?

The most common causes of B1279 include: Brightness switch malfunction; Open or short circuit in wiring harness; Poor contact in connectors; Blown fuse.

How do I fix a B1279 diagnostic trouble code?

To fix B1279: Check the fuse associated with the backlight circuit. Inspect the wiring harness for damage. Check the operation of the brightness switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1279?

Limited driving only, diagnose soon

How much does it cost to fix B1279?

The estimated repair cost for B1279 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat