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Engine-Codes – Generic – B1C1A

B1C1A Code - Passenger Active Headrest Control Circuit Open

Quick Answer

The B1C1A diagnostic trouble code (DTC) indicates that there is an open circuit in the passenger active headrest control system. Common causes include Damaged wiring or connectors in the headrest control circuit, Faulty headrest control module, Loose or corroded electrical connections. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1C1A indicates Passenger Active Headrest Control Circuit Open.
Common causes
Common causes include Damaged wiring or connectors in the headrest control circuit, Faulty headrest control module, Loose or corroded electrical connections.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code B1C1A Description

The B1C1A diagnostic trouble code (DTC) indicates that there is an open circuit in the passenger active headrest control system. This system is responsible for deploying the headrest in the event of a rear-end collision to reduce the risk of whiplash injury to the occupant. An open circuit means there is a break in the electrical connection, preventing the control module from communicating with the headrest mechanism. This can compromise the effectiveness of the active headrest system and potentially put the passenger at risk in the event of a collision.

OBDII Code B1C1A - Passenger Active Headrest Control Circuit Open
B1C1A Code - Passenger Active Headrest Control Circuit Open

Common Causes of B1C1A

  1. Damaged wiring or connectors in the headrest control circuit.
  2. Faulty headrest control module.
  3. Loose or corroded electrical connections.
  4. Physical damage to the headrest mechanism.
  5. Software issues within the vehicle's control system.

Symptoms of B1C1A

  1. The passenger active headrest may fail to deploy in a rear-end collision.
  2. The airbag warning light may illuminate on the dashboard.
  3. The active headrest control button may not function properly.
  4. The passive headrest may not adjust automatically as intended.
  5. The vehicle may fail a safety inspection due to the inactive headrest system.

How to Fix B1C1A

  1. Begin by conducting a visual inspection of the wiring and connectors in the headrest control circuit to identify any visible damage or corrosion.
  2. Use a multimeter to test the continuity of the circuit and locate the open connection.
  3. Repair or replace any damaged wiring, connectors, or components as needed.
  4. Clear the DTC from the vehicle's computer using a diagnostic scanner.
  5. Test the system to ensure proper operation and functionality of the passenger active headrest.

Cost to Fix B1C1A

The cost of repairing a passenger active headrest control circuit open issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, you can expect to pay between $100 and $300 for parts and labor. Keep in mind that additional diagnostic time may be required to pinpoint the exact cause of the open circuit, which can affect the overall cost. It's advisable to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle make and model.

When is the Code Detected?

This code will set, if the Occupant Restraint Controller (ORC) detects an Open circuit on the Passenger Head Restraint Solenoid Signal circuit.

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Code B1C1A Information for Specific Makes

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1C1A Code

1. What does the OBDII code B1C1A mean?

The code B1C1A indicates an open circuit in the Passenger Active Headrest Control Circuit, which is part of the vehicle's safety system designed to reduce whiplash injuries in a collision.

2. What are the symptoms of code B1C1A?

Common symptoms include an illuminated airbag or SRS warning light, the passenger active headrest not deploying in a crash, or diagnostic trouble codes stored in the control module.

3. What causes the B1C1A code?

This code is typically caused by a damaged or disconnected wiring harness, a faulty active headrest actuator, or issues with the control module.

4. Can I drive with the B1C1A code active?

While the vehicle may still be drivable, the safety system may not function properly in a crash, so it is recommended to address the issue as soon as possible.

5. How is the B1C1A code diagnosed?

A technician will use a scan tool to read the code, inspect the wiring and connectors for damage or disconnection, and test the active headrest actuator for proper operation.

6. How can I fix the B1C1A code?

Repairs may include reconnecting or repairing damaged wiring, replacing a faulty active headrest actuator, or in rare cases, replacing the control module.

7. Can I reset the B1C1A code without repairing it?

You can clear the code with a scan tool, but it will likely return if the underlying issue is not resolved.

8. How much does it cost to fix the B1C1A code?

Repair costs vary depending on the issue but may range from $100 to $500, with actuator replacement being on the higher end.

9. Is the B1C1A code related to airbag deployment?

Yes, this code is part of the SRS system, and an unresolved issue could impact the proper deployment of safety features during a collision.

10. Can a low battery cause the B1C1A code?

While unlikely, low voltage can sometimes affect electronic systems. It’s recommended to check the battery and charging system if no other faults are found.

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