OBD Guide
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B1771

Passenger Side Buckle Switch Circuit Malfunction

B1771 is an OBD-II diagnostic trouble code meaning: Passenger Side Buckle Switch Circuit Malfunction. Common causes: open or short circuit in wiring harness, faulty seat belt sensor. Estimated repair cost: $22–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–167 (est.)

Symptoms

  • Airbag light is on
  • The passive safety system may not work in an emergency situation
  • No sound signal for unfastened seat belt

Causes

  • Open or short circuit in wiring harness
  • Faulty seat belt sensor
  • Oxidized or damaged contacts in connectors
  • Problems with the passive safety control unit

How to Fix

  1. Check the integrity and liquidity of the wires from the sensor to the control unit
  2. Inspect the contacts in the connectors, clean them from oxidation
  3. Check the functionality of the seat belt sensor
  4. Replacement of faulty components if necessary
  5. Resetting the error using a diagnostic scanner

Related codes

B1770B1772B1773

FAQ

What does the B1771 code mean?

B1771 is an OBD-II diagnostic trouble code that indicates: Passenger Side Buckle Switch Circuit Malfunction

What causes a B1771 error code?

The most common causes of B1771 include: Open or short circuit in wiring harness; Faulty seat belt sensor; Oxidized or damaged contacts in connectors; Problems with the passive safety control unit.

How do I fix a B1771 diagnostic trouble code?

To fix B1771: Check the integrity and liquidity of the wires from the sensor to the control unit. Inspect the contacts in the connectors, clean them from oxidation. Check the functionality of the seat belt sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1771?

Do not drive — repair immediately

How much does it cost to fix B1771?

The estimated repair cost for B1771 is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat