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Engine-Codes – Generic – B1C18

B1C18 Code - Passenger Active Headrest Control Circuit Low

Quick Answer

The B1C18 code indicates a problem with the passenger active headrest control circuit being detected as low. Common causes include Faulty wiring or connections in the active headrest control circuit, A malfunctioning active headrest control module, Damage to the active headrest mechanism. 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
B1C18 indicates Passenger Active Headrest Control Circuit Low.
Common causes
Common causes include Faulty wiring or connections in the active headrest control circuit, A malfunctioning active headrest control module, Damage to the active headrest mechanism.
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 Sep 13, 2024
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Code B1C18 Description

The B1C18 code indicates a problem with the passenger active headrest control circuit being detected as low. Active headrests are a safety feature in modern vehicles that automatically move forward in the event of a rear-end collision to reduce the risk of whiplash injuries. The control circuit is responsible for managing the activation and deactivation of the active headrest system. When this circuit is detected as low, it means that there is a malfunction or a fault in the system that could prevent the active headrest from deploying properly in the event of a collision.

OBDII Code B1C18 - Passenger Active Headrest Control Circuit Low
B1C18 Code - Passenger Active Headrest Control Circuit Low

Common Causes of B1C18

  1. Faulty wiring or connections in the active headrest control circuit.
  2. A malfunctioning active headrest control module.
  3. Damage to the active headrest mechanism.
  4. Corrosion or moisture in the circuit causing a short.
  5. Electrical issues within the vehicle's system affecting the control circuit.

Symptoms of B1C18

  1. Malfunctioning or non-responsive active headrest.
  2. Illumination of the airbag warning light on the dashboard.
  3. Inability to adjust the position of the active headrest.
  4. Unusual noises coming from the active headrest mechanism.

How to Fix B1C18

  1. Begin by conducting a thorough visual inspection of the active headrest system, checking for any visible damage, loose connections, or signs of corrosion.
  2. Use a multimeter to test the continuity of the wiring in the control circuit to identify any breaks or shorts.
  3. Inspect the active headrest control module for any signs of damage or malfunction, and replace if necessary.
  4. Clear the diagnostic trouble codes from the vehicle's system using a scan tool after completing the repairs.
  5. Test the active headrest system to ensure proper functionality and make any adjustments as needed.

Cost to Fix B1C18

The cost of repairing a passenger active headrest control circuit low issue can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the parts for this repair can range from $100 to $300, while the labor costs can be between $150 and $300. Overall, the total repair cost for this issue may fall between $250 and $600. It is important to note that these are rough estimates, and actual costs may differ based on the factors mentioned earlier. It is recommended to consult with a professional mechanic to get an accurate quote for the repair.

When is the Code Detected?

This code will set, if the Occupant Restraint Controller (ORC) detects low voltage on the Active Head Restraint 1st Row Passenger Signal circuit.

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Code B1C18 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 B1C18 Code

1. What does OBDII code B1C18 mean?

Code B1C18 indicates a problem with the Passenger Active Headrest Control Circuit, specifically that the circuit voltage is lower than expected.

2. What are the common symptoms of code B1C18?

Typical symptoms include an illuminated airbag warning light, failure of the active headrest system to deploy properly, and potential passenger safety risks in a collision.

3. What causes the B1C18 code?

The most common causes are damaged wiring, poor electrical connections, a malfunctioning active headrest control module, or a faulty passenger headrest actuator.

4. Can I drive with the B1C18 code?

While the vehicle may be drivable, the active headrest system may not function correctly in an accident, compromising passenger safety. It’s important to address the issue promptly.

5. How do I diagnose the B1C18 code?

Begin by inspecting the wiring and connectors for damage or corrosion, then test the voltage and continuity in the Passenger Active Headrest Control Circuit. A scan tool can also help pinpoint the fault.

6. How can I fix the B1C18 code?

Repairs may involve replacing damaged wires, cleaning corroded connectors, repairing or replacing the active headrest control module, or replacing the passenger headrest actuator.

7. Is a faulty active headrest actuator a common issue with B1C18?

Yes, a malfunctioning or stuck passenger headrest actuator is a frequent cause of this code and should be tested during diagnosis.

8. How much does it cost to fix the B1C18 code?

Repair costs vary depending on the issue, ranging from $50 to $300 for wiring repairs, and up to $1,000 if the headrest actuator or control module needs replacement.

9. Can a low battery cause the B1C18 code?

Yes, a weak or failing battery can lead to low voltage in the circuit, potentially triggering the B1C18 code. Ensure the battery and charging system are in good condition.

10. Do I need a professional mechanic to fix the B1C18 code?

While basic inspections can be done at home, diagnosing and repairing electrical or module-related issues often requires specialized tools and expertise, so consulting a professional is recommended.

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