OBD Guide
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B1C18

Passenger Active Headrest Control Circuit Low

B1C18 is an OBD-II diagnostic trouble code meaning: Passenger Active Headrest Control Circuit Low. Common causes: open or short circuit in wiring harness, headrest motor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • SRS/airbag indicator is on
  • The active head restraint does not engage in a rear collision
  • Error message on display

Causes

  • Open or short circuit in wiring harness
  • Headrest motor malfunction
  • Problems with the SRS control unit
  • Poor contact in connectors

How to Fix

  1. Check the integrity of the wiring harness to the headrest
  2. Check voltage at headrest connectors
  3. Test the operation of the headrest motor
  4. Scan the SRS control unit for other errors
  5. If necessary, replace faulty components

Related codes

B1C17B1C19B1C20

FAQ

What does the B1C18 code mean?

B1C18 is an OBD-II diagnostic trouble code that indicates: Passenger Active Headrest Control Circuit Low

What causes a B1C18 error code?

The most common causes of B1C18 include: Open or short circuit in wiring harness; Headrest motor malfunction; Problems with the SRS control unit; Poor contact in connectors.

How do I fix a B1C18 diagnostic trouble code?

To fix B1C18: Check the integrity of the wiring harness to the headrest. Check voltage at headrest connectors. Test the operation of the headrest motor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1C18?

Limited driving only, diagnose soon

How much does it cost to fix B1C18?

The estimated repair cost for B1C18 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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