OBD Guide
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B1686

Lamp Dome Input Circuit Open

B1686 is an OBD-II diagnostic trouble code meaning: Lamp Dome Input Circuit Open. Common causes: broken wiring harness, interior lamp malfunction. Estimated repair cost: $17–56.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Interior lamp does not turn on
  • The interior lamp turns on randomly
  • Error B1686 in fault memory
  • Incorrect operation of other lighting systems

Causes

  • Broken wiring harness
  • Interior lamp malfunction
  • Short circuit in the circuit
  • Oxidation of contacts
  • Body Control Module (BCM) Malfunction

How to Fix

  1. Check the functionality of the interior lamp
  2. Inspect the wiring harness for breaks or damage
  3. Check the integrity of the interior lamp fuse
  4. Check contacts and connectors
  5. If necessary, replace faulty components
  6. Reset the error and check the system operation

Related codes

B1685B1687B1688

FAQ

What does the B1686 code mean?

B1686 is an OBD-II diagnostic trouble code that indicates: Lamp Dome Input Circuit Open

What causes a B1686 error code?

The most common causes of B1686 include: Broken wiring harness; Interior lamp malfunction; Short circuit in the circuit; Oxidation of contacts.

How do I fix a B1686 diagnostic trouble code?

To fix B1686: Check the functionality of the interior lamp. Inspect the wiring harness for breaks or damage. Check the integrity of the interior lamp fuse. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1686?

Yes, but get it checked soon

How much does it cost to fix B1686?

The estimated repair cost for B1686 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat