OBD Guide
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B1579

Dim Panel Increase Input Circuit Failure

B1579 is an OBD-II diagnostic trouble code meaning: Dim Panel Increase Input Circuit Failure. Common causes: open or short circuit in wiring harness, faulty brightness switch. Estimated repair cost: $22–111.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Lack of response of the instrument panel backlight to brightness adjustment
  • Constant backlight brightness regardless of settings
  • Flickering or random changes in backlight brightness

Causes

  • Open or short circuit in wiring harness
  • Faulty brightness switch
  • Oxidation or damage to connectors
  • Failure in the backlight control module
  • Chain ground problems

How to Fix

  1. Check the integrity of the backlight circuit wiring harness
  2. Test the brightness switch
  3. Clean or replace damaged connectors
  4. Check the operation of the backlight control module
  5. Diagnose the ground circuit and the condition of the fuses

Related codes

B1580B1581

FAQ

What does the B1579 code mean?

B1579 is an OBD-II diagnostic trouble code that indicates: Dim Panel Increase Input Circuit Failure

What causes a B1579 error code?

The most common causes of B1579 include: Open or short circuit in wiring harness; Faulty brightness switch; Oxidation or damage to connectors; Failure in the backlight control module.

How do I fix a B1579 diagnostic trouble code?

To fix B1579: Check the integrity of the backlight circuit wiring harness. Test the brightness switch. Clean or replace damaged connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1579?

Limited driving only, diagnose soon

How much does it cost to fix B1579?

The estimated repair cost for B1579 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat