OBD Guide
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B1678

Alarm Panic Input Circuit Open

B1678 is an OBD-II diagnostic trouble code meaning: Alarm Panic Input Circuit Open. Common causes: broken wiring harness, damage to the panic button. Estimated repair cost: $6–56.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)

Symptoms

  • Panic button doesn't work
  • The alarm does not activate
  • The fault indicator lights up

Causes

  • Broken wiring harness
  • Damage to the panic button
  • Short circuit in the circuit
  • Electronic module malfunction

How to Fix

  1. Check the integrity of the wiring harness
  2. Inspect connectors for oxidation or damage
  3. Test the panic button
  4. Replace damaged components

Related codes

B1676B1677B1679

FAQ

What does the B1678 code mean?

B1678 is an OBD-II diagnostic trouble code that indicates: Alarm Panic Input Circuit Open

What causes a B1678 error code?

The most common causes of B1678 include: Broken wiring harness; Damage to the panic button; Short circuit in the circuit; Electronic module malfunction.

How do I fix a B1678 diagnostic trouble code?

To fix B1678: Check the integrity of the wiring harness. Inspect connectors for oxidation or damage. Test the panic button. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1678?

Do not drive — repair immediately

How much does it cost to fix B1678?

The estimated repair cost for B1678 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat