OBD Guide
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B2494

Anti-Theft Horn Output Circuit Short To Battery

B2494 is an OBD-II diagnostic trouble code meaning: Anti-Theft Horn Output Circuit Short To Battery. Common causes: damage to the alarm wiring harness, faulty horn relay. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Alarm sound does not work
  • False alarms
  • Constantly lit security indicator
  • Low battery

Causes

  • Damage to the alarm wiring harness
  • Faulty horn relay
  • Short circuit in connectors
  • Faulty alarm control unit
  • Incorrect installation of abnormal alarm

How to Fix

  1. Visual inspection of wiring in the horn and relay area
  2. Checking the resistance of the alarm circuit with a multimeter
  3. Diagnosis of alarm relay status
  4. Checking contacts in circuit connectors
  5. Replacing damaged components
  6. Resetting the error and checking the system operation

Related codes

B2493B2495B2477

FAQ

What does the B2494 code mean?

B2494 is an OBD-II diagnostic trouble code that indicates: Anti-Theft Horn Output Circuit Short To Battery

What causes a B2494 error code?

The most common causes of B2494 include: Damage to the alarm wiring harness; Faulty horn relay; Short circuit in connectors; Faulty alarm control unit.

How do I fix a B2494 diagnostic trouble code?

To fix B2494: Visual inspection of wiring in the horn and relay area. Checking the resistance of the alarm circuit with a multimeter. Diagnosis of alarm relay status. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2494?

Yes, but get it checked soon

How much does it cost to fix B2494?

The estimated repair cost for B2494 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat